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From vatam...@apache.org
Subject [couchdb] 06/09: Refactor utils into 3 modules
Date Tue, 25 Apr 2017 14:57:44 GMT
This is an automated email from the ASF dual-hosted git repository.

vatamane pushed a commit to branch 63012-scheduler
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit d6a3e05a3c3de207117eb05d7f45dbc7fcc8fb55
Author: Nick Vatamaniuc <vatamane@apache.org>
AuthorDate: Fri May 13 18:12:52 2016 -0400

    Refactor utils into 3 modules
    
    Over the years utils accumulated a lot of functionality. Clean up a bit by
    separating it into specific modules according to semantics:
    
     - couch_replicator_docs : Handle read and writing to replicator dbs.
       It includes updating state fields, parsing options from documents, and
       making sure replication VDU design document is in sync.
    
     - couch_replicator_filters : Fetch and manipulate replication filters.
    
     - couch_replicator_ids : Calculate replication IDs. Handles versioning and
       Pretty formatting of IDs. Filtered replications using user filter functions
       incorporate a filter code hash into the calculation, in that case call
       couch_replicator_filters module to fetch the filter from the source.
    
    Jira: COUCHDB-3324
---
 src/couch_replicator/src/couch_replicator_docs.erl | 756 +++++++++++++++++++++
 .../src/couch_replicator_filters.erl               | 214 ++++++
 src/couch_replicator/src/couch_replicator_ids.erl  | 127 ++++
 .../src/couch_replicator_utils.erl                 | 583 +++-------------
 4 files changed, 1198 insertions(+), 482 deletions(-)

diff --git a/src/couch_replicator/src/couch_replicator_docs.erl b/src/couch_replicator/src/couch_replicator_docs.erl
new file mode 100644
index 0000000..cce4ce2
--- /dev/null
+++ b/src/couch_replicator/src/couch_replicator_docs.erl
@@ -0,0 +1,756 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_replicator_docs).
+
+-export([
+    parse_rep_doc/1,
+    parse_rep_doc/2,
+    parse_rep_db/3,
+    parse_rep_doc_without_id/1,
+    parse_rep_doc_without_id/2,
+    before_doc_update/2,
+    after_doc_read/2,
+    ensure_rep_db_exists/0,
+    ensure_rep_ddoc_exists/1,
+    ensure_cluster_rep_ddoc_exists/1,
+    remove_state_fields/2,
+    update_doc_completed/3,
+    update_failed/3,
+    update_rep_id/1,
+    update_triggered/2,
+    update_error/2
+]).
+
+
+-include_lib("couch/include/couch_db.hrl").
+-include_lib("ibrowse/include/ibrowse.hrl").
+-include_lib("mem3/include/mem3.hrl").
+-include("couch_replicator_api_wrap.hrl").
+-include("couch_replicator.hrl").
+-include("couch_replicator_js_functions.hrl").
+
+-import(couch_util, [
+    get_value/2,
+    get_value/3,
+    to_binary/1
+]).
+
+-import(couch_replicator_utils, [
+    get_json_value/2,
+    get_json_value/3
+]).
+
+
+-define(REP_DB_NAME, <<"_replicator">>).
+-define(REP_DESIGN_DOC, <<"_design/_replicator">>).
+-define(OWNER, <<"owner">>).
+-define(CTX, {user_ctx, #user_ctx{roles=[<<"_admin">>, <<"_replicator">>]}}).
+-define(replace(L, K, V), lists:keystore(K, 1, L, {K, V})).
+
+
+remove_state_fields(DbName, DocId) ->
+    update_rep_doc(DbName, DocId, [
+        {<<"_replication_state">>, undefined},
+        {<<"_replication_state_time">>, undefined},
+        {<<"_replication_state_reason">>, undefined},
+        {<<"_replication_id">>, undefined},
+        {<<"_replication_stats">>, undefined}]).
+
+
+-spec update_doc_completed(binary(), binary(), [_]) -> any().
+update_doc_completed(DbName, DocId, Stats) ->
+    update_rep_doc(DbName, DocId, [
+        {<<"_replication_state">>, <<"completed">>},
+        {<<"_replication_state_reason">>, undefined},
+        {<<"_replication_stats">>, {Stats}}]),
+    couch_stats:increment_counter([couch_replicator, docs,
+        completed_state_updates]).
+
+
+-spec update_failed(binary(), binary(), any()) -> any().
+update_failed(DbName, DocId, Error) ->
+    Reason = error_reason(Error),
+    couch_log:error("Error processing replication doc `~s` from `~s`: ~s",
+        [DocId, DbName, Reason]),
+    update_rep_doc(DbName, DocId, [
+        {<<"_replication_state">>, <<"failed">>},
+        {<<"_replication_stats">>, undefined},
+        {<<"_replication_state_reason">>, Reason}]),
+    couch_stats:increment_counter([couch_replicator, docs,
+        failed_state_updates]).
+
+
+-spec update_triggered(#rep{}, rep_id()) -> ok.
+update_triggered(Rep, {Base, Ext}) ->
+    #rep{
+        db_name = DbName,
+        doc_id = DocId
+    } = Rep,
+    update_rep_doc(DbName, DocId, [
+        {<<"_replication_state">>, <<"triggered">>},
+        {<<"_replication_state_reason">>, undefined},
+        {<<"_replication_id">>, iolist_to_binary([Base, Ext])},
+        {<<"_replication_stats">>, undefined}]),
+    ok.
+
+
+-spec update_error(#rep{}, any()) -> ok.
+update_error(#rep{db_name = DbName, doc_id = DocId, id = RepId}, Error) ->
+    Reason = error_reason(Error),
+    BinRepId = case RepId of
+        {Base, Ext} ->
+            iolist_to_binary([Base, Ext]);
+        _Other ->
+            null
+    end,
+    update_rep_doc(DbName, DocId, [
+        {<<"_replication_state">>, <<"error">>},
+        {<<"_replication_state_reason">>, Reason},
+        {<<"_replication_stats">>, undefined},
+        {<<"_replication_id">>, BinRepId}]),
+    ok.
+
+
+-spec ensure_rep_db_exists() -> {ok, #db{}}.
+ensure_rep_db_exists() ->
+    Db = case couch_db:open_int(?REP_DB_NAME, [?CTX, sys_db,
+            nologifmissing]) of
+        {ok, Db0} ->
+            Db0;
+        _Error ->
+            {ok, Db0} = couch_db:create(?REP_DB_NAME, [?CTX, sys_db]),
+            Db0
+    end,
+    ok = ensure_rep_ddoc_exists(?REP_DB_NAME),
+    {ok, Db}.
+
+
+-spec ensure_rep_ddoc_exists(binary()) -> ok.
+ensure_rep_ddoc_exists(RepDb) ->
+    case mem3:belongs(RepDb, ?REP_DESIGN_DOC) of
+        true ->
+            ensure_rep_ddoc_exists(RepDb, ?REP_DESIGN_DOC);
+        false ->
+            ok
+    end.
+
+
+-spec ensure_rep_ddoc_exists(binary(), binary()) -> ok.
+ensure_rep_ddoc_exists(RepDb, DDocId) ->
+    case open_rep_doc(RepDb, DDocId) of
+        {not_found, no_db_file} ->
+            %% database was deleted.
+            ok;
+        {not_found, _Reason} ->
+            DocProps = replication_design_doc_props(DDocId),
+            DDoc = couch_doc:from_json_obj({DocProps}),
+            couch_log:notice("creating replicator ddoc", []),
+            {ok, _Rev} = save_rep_doc(RepDb, DDoc);
+        {ok, Doc} ->
+            Latest = replication_design_doc_props(DDocId),
+            {Props0} = couch_doc:to_json_obj(Doc, []),
+            {value, {_, Rev}, Props} = lists:keytake(<<"_rev">>, 1, Props0),
+            case compare_ejson({Props}, {Latest}) of
+                true ->
+                    ok;
+                false ->
+                    LatestWithRev = [{<<"_rev">>, Rev} | Latest],
+                    DDoc = couch_doc:from_json_obj({LatestWithRev}),
+                    couch_log:notice("updating replicator ddoc", []),
+                    try
+                        {ok, _} = save_rep_doc(RepDb, DDoc)
+                    catch
+                        throw:conflict ->
+                            %% ignore, we'll retry next time
+                            ok
+                    end
+            end
+    end,
+    ok.
+
+
+-spec ensure_cluster_rep_ddoc_exists(binary()) -> ok.
+ensure_cluster_rep_ddoc_exists(RepDb) ->
+    DDocId = ?REP_DESIGN_DOC,
+    [#shard{name = DbShard} | _] = mem3:shards(RepDb, DDocId),
+    ensure_rep_ddoc_exists(DbShard, DDocId).
+
+
+-spec compare_ejson({[_]}, {[_]}) -> boolean().
+compare_ejson(EJson1, EJson2) ->
+    EjsonSorted1 = couch_replicator_filters:ejsort(EJson1),
+    EjsonSorted2 = couch_replicator_filters:ejsort(EJson2),
+    EjsonSorted1 == EjsonSorted2.
+
+
+-spec replication_design_doc_props(binary()) -> [_].
+replication_design_doc_props(DDocId) ->
+    [
+        {<<"_id">>, DDocId},
+        {<<"language">>, <<"javascript">>},
+        {<<"validate_doc_update">>, ?REP_DB_DOC_VALIDATE_FUN}
+    ].
+
+
+% Note: parse_rep_doc can handle filtered replications. During parsing of the
+% replication doc it will make possibly remote http requests to the source
+% database. If failure or parsing of filter docs fails, parse_doc throws a
+% {filter_fetch_error, Error} excation. This exception should be considered
+% transient in respect to the contents of the document itself, since it depends
+% on netowrk availability of the source db and other factors.
+-spec parse_rep_doc({[_]}) -> #rep{}.
+parse_rep_doc(RepDoc) ->
+    {ok, Rep} = try
+        parse_rep_doc(RepDoc, rep_user_ctx(RepDoc))
+    catch
+        throw:{error, Reason} ->
+            throw({bad_rep_doc, Reason});
+        throw:{filter_fetch_error, Reason} ->
+            throw({filter_fetch_error, Reason});
+        Tag:Err ->
+            throw({bad_rep_doc, to_binary({Tag, Err})})
+    end,
+    Rep.
+
+
+-spec parse_rep_doc_without_id({[_]}) -> #rep{}.
+parse_rep_doc_without_id(RepDoc) ->
+    {ok, Rep} = try
+        parse_rep_doc_without_id(RepDoc, rep_user_ctx(RepDoc))
+    catch
+        throw:{error, Reason} ->
+            throw({bad_rep_doc, Reason});
+        Tag:Err ->
+            throw({bad_rep_doc, to_binary({Tag, Err})})
+    end,
+    Rep.
+
+
+-spec parse_rep_doc({[_]}, #user_ctx{}) -> {ok, #rep{}}.
+parse_rep_doc(Doc, UserCtx) ->
+    {ok, Rep} = parse_rep_doc_without_id(Doc, UserCtx),
+    Cancel = get_value(cancel, Rep#rep.options, false),
+    Id = get_value(id, Rep#rep.options, nil),
+    case {Cancel, Id} of
+        {true, nil} ->
+            % Cancel request with no id, must parse id out of body contents
+            {ok, update_rep_id(Rep)};
+        {true, Id} ->
+            % Cancel request with an id specified, so do not parse id from body
+            {ok, Rep};
+        {false, _Id} ->
+            % Not a cancel request, regular replication doc
+            {ok, update_rep_id(Rep)}
+    end.
+
+
+-spec parse_rep_doc_without_id({[_]}, #user_ctx{}) -> {ok, #rep{}}.
+parse_rep_doc_without_id({Props}, UserCtx) ->
+    Proxy = get_value(<<"proxy">>, Props, <<>>),
+    Opts = make_options(Props),
+    case get_value(cancel, Opts, false) andalso
+        (get_value(id, Opts, nil) =/= nil) of
+    true ->
+        {ok, #rep{options = Opts, user_ctx = UserCtx}};
+    false ->
+        Source = parse_rep_db(get_value(<<"source">>, Props), Proxy, Opts),
+        Target = parse_rep_db(get_value(<<"target">>, Props), Proxy, Opts),
+        {Type, View} = case couch_replicator_filters:view_type(Props, Opts) of
+        {error, Error} ->
+            throw({bad_request, Error});
+        Result ->
+            Result
+        end,
+        Rep = #rep{
+            source = Source,
+            target = Target,
+            options = Opts,
+            user_ctx = UserCtx,
+            type = Type,
+            view = View,
+            doc_id = get_value(<<"_id">>, Props, null)
+        },
+        % Check if can parse filter code, if not throw exception
+        case couch_replicator_filters:parse(Opts) of
+        {error, FilterError} ->
+            throw({error, FilterError});
+        {ok, _Filter} ->
+             ok
+        end,
+        {ok, Rep}
+    end.
+
+
+% Update a #rep{} record with a replication_id. Calculating the id might involve
+% fetching a filter from the source db, and so it could fail intermetently.
+% In case of a failure to fetch the filter this function will throw a
+%  `{filter_fetch_error, Reason} exception.
+update_rep_id(Rep) ->
+    RepId = couch_replicator_ids:replication_id(Rep),
+    Rep#rep{id = RepId}.
+
+
+update_rep_doc(RepDbName, RepDocId, KVs) ->
+    update_rep_doc(RepDbName, RepDocId, KVs, 1).
+
+
+update_rep_doc(RepDbName, RepDocId, KVs, Wait) when is_binary(RepDocId) ->
+    try
+        case open_rep_doc(RepDbName, RepDocId) of
+            {ok, LastRepDoc} ->
+                update_rep_doc(RepDbName, LastRepDoc, KVs, Wait * 2);
+            _ ->
+                ok
+        end
+    catch
+        throw:conflict ->
+            Msg = "Conflict when updating replication doc `~s`. Retrying.",
+            couch_log:error(Msg, [RepDocId]),
+            ok = timer:sleep(random:uniform(erlang:min(128, Wait)) * 100),
+            update_rep_doc(RepDbName, RepDocId, KVs, Wait * 2)
+    end;
+
+update_rep_doc(RepDbName, #doc{body = {RepDocBody}} = RepDoc, KVs, _Try) ->
+    NewRepDocBody = lists:foldl(
+        fun({K, undefined}, Body) ->
+                lists:keydelete(K, 1, Body);
+           ({<<"_replication_state">> = K, State} = KV, Body) ->
+                case get_json_value(K, Body) of
+                State ->
+                    Body;
+                _ ->
+                    Body1 = lists:keystore(K, 1, Body, KV),
+                    Timestamp = couch_replicator_utils:iso8601(os:timestamp()),
+                    lists:keystore(
+                        <<"_replication_state_time">>, 1, Body1,
+                        {<<"_replication_state_time">>, Timestamp})
+                end;
+            ({K, _V} = KV, Body) ->
+                lists:keystore(K, 1, Body, KV)
+        end,
+        RepDocBody, KVs),
+    case NewRepDocBody of
+    RepDocBody ->
+        ok;
+    _ ->
+        % Might not succeed - when the replication doc is deleted right
+        % before this update (not an error, ignore).
+        save_rep_doc(RepDbName, RepDoc#doc{body = {NewRepDocBody}})
+    end.
+
+
+open_rep_doc(DbName, DocId) ->
+    case couch_db:open_int(DbName, [?CTX, sys_db]) of
+        {ok, Db} ->
+            try
+                couch_db:open_doc(Db, DocId, [ejson_body])
+            after
+                couch_db:close(Db)
+            end;
+        Else ->
+            Else
+    end.
+
+
+save_rep_doc(DbName, Doc) ->
+    {ok, Db} = couch_db:open_int(DbName, [?CTX, sys_db]),
+    try
+        couch_db:update_doc(Db, Doc, [])
+    after
+        couch_db:close(Db)
+    end.
+
+
+-spec rep_user_ctx({[_]}) -> #user_ctx{}.
+rep_user_ctx({RepDoc}) ->
+    case get_json_value(<<"user_ctx">>, RepDoc) of
+    undefined ->
+        #user_ctx{};
+    {UserCtx} ->
+        #user_ctx{
+            name = get_json_value(<<"name">>, UserCtx, null),
+            roles = get_json_value(<<"roles">>, UserCtx, [])
+        }
+    end.
+
+
+-spec parse_rep_db({[_]} | binary(), binary(), [_]) -> #httpd{} | binary().
+parse_rep_db({Props}, Proxy, Options) ->
+    ProxyParams = parse_proxy_params(Proxy),
+    ProxyURL = case ProxyParams of
+        [] -> undefined;
+        _ -> binary_to_list(Proxy)
+    end,
+    Url = maybe_add_trailing_slash(get_value(<<"url">>, Props)),
+    {AuthProps} = get_value(<<"auth">>, Props, {[]}),
+    {BinHeaders} = get_value(<<"headers">>, Props, {[]}),
+    Headers = lists:ukeysort(1, [{?b2l(K), ?b2l(V)} || {K, V} <- BinHeaders]),
+    DefaultHeaders = (#httpdb{})#httpdb.headers,
+    OAuth = case get_value(<<"oauth">>, AuthProps) of
+    undefined ->
+        nil;
+    {OauthProps} ->
+        #oauth{
+            consumer_key = ?b2l(get_value(<<"consumer_key">>, OauthProps)),
+            token = ?b2l(get_value(<<"token">>, OauthProps)),
+            token_secret = ?b2l(get_value(<<"token_secret">>, OauthProps)),
+            consumer_secret = ?b2l(get_value(<<"consumer_secret">>,
+                OauthProps)),
+            signature_method =
+                case get_value(<<"signature_method">>, OauthProps) of
+                undefined ->        hmac_sha1;
+                <<"PLAINTEXT">> ->  plaintext;
+                <<"HMAC-SHA1">> ->  hmac_sha1;
+                <<"RSA-SHA1">> ->   rsa_sha1
+                end
+        }
+    end,
+    #httpdb{
+        url = Url,
+        oauth = OAuth,
+        headers = lists:ukeymerge(1, Headers, DefaultHeaders),
+        ibrowse_options = lists:keysort(1,
+            [{socket_options, get_value(socket_options, Options)} |
+                ProxyParams ++ ssl_params(Url)]),
+        timeout = get_value(connection_timeout, Options),
+        http_connections = get_value(http_connections, Options),
+        retries = get_value(retries, Options),
+        proxy_url = ProxyURL
+    };
+
+parse_rep_db(<<"http://", _/binary>> = Url, Proxy, Options) ->
+    parse_rep_db({[{<<"url">>, Url}]}, Proxy, Options);
+
+parse_rep_db(<<"https://", _/binary>> = Url, Proxy, Options) ->
+    parse_rep_db({[{<<"url">>, Url}]}, Proxy, Options);
+
+parse_rep_db(<<DbName/binary>>, _Proxy, _Options) ->
+    DbName;
+
+parse_rep_db(undefined, _Proxy, _Options) ->
+    throw({error, <<"Missing replicator database">>}).
+
+
+-spec maybe_add_trailing_slash(binary() | list()) -> list().
+maybe_add_trailing_slash(Url) when is_binary(Url) ->
+    maybe_add_trailing_slash(?b2l(Url));
+maybe_add_trailing_slash(Url) ->
+    case lists:member($?, Url) of
+        true ->
+            Url;  % skip if there are query params
+        false ->
+            case lists:last(Url) of
+                $/ ->
+                    Url;
+                _ ->
+                    Url ++ "/"
+            end
+    end.
+
+
+-spec make_options([_]) -> [_].
+make_options(Props) ->
+    Options0 = lists:ukeysort(1, convert_options(Props)),
+    Options = check_options(Options0),
+    DefWorkers = config:get("replicator", "worker_processes", "4"),
+    DefBatchSize = config:get("replicator", "worker_batch_size", "500"),
+    DefConns = config:get("replicator", "http_connections", "20"),
+    DefTimeout = config:get("replicator", "connection_timeout", "30000"),
+    DefRetries = config:get("replicator", "retries_per_request", "10"),
+    UseCheckpoints = config:get("replicator", "use_checkpoints", "true"),
+    DefCheckpointInterval = config:get("replicator", "checkpoint_interval",
+        "30000"),
+    {ok, DefSocketOptions} = couch_util:parse_term(
+        config:get("replicator", "socket_options",
+            "[{keepalive, true}, {nodelay, false}]")),
+    lists:ukeymerge(1, Options, lists:keysort(1, [
+        {connection_timeout, list_to_integer(DefTimeout)},
+        {retries, list_to_integer(DefRetries)},
+        {http_connections, list_to_integer(DefConns)},
+        {socket_options, DefSocketOptions},
+        {worker_batch_size, list_to_integer(DefBatchSize)},
+        {worker_processes, list_to_integer(DefWorkers)},
+        {use_checkpoints, list_to_existing_atom(UseCheckpoints)},
+        {checkpoint_interval, list_to_integer(DefCheckpointInterval)}
+    ])).
+
+
+-spec convert_options([_]) -> [_].
+convert_options([])->
+    [];
+convert_options([{<<"cancel">>, V} | _R]) when not is_boolean(V)->
+    throw({bad_request, <<"parameter `cancel` must be a boolean">>});
+convert_options([{<<"cancel">>, V} | R]) ->
+    [{cancel, V} | convert_options(R)];
+convert_options([{IdOpt, V} | R]) when IdOpt =:= <<"_local_id">>;
+        IdOpt =:= <<"replication_id">>; IdOpt =:= <<"id">> ->
+    [{id, couch_replicator_ids:convert(V)} | convert_options(R)];
+convert_options([{<<"create_target">>, V} | _R]) when not is_boolean(V)->
+    throw({bad_request, <<"parameter `create_target` must be a boolean">>});
+convert_options([{<<"create_target">>, V} | R]) ->
+    [{create_target, V} | convert_options(R)];
+convert_options([{<<"continuous">>, V} | _R]) when not is_boolean(V)->
+    throw({bad_request, <<"parameter `continuous` must be a boolean">>});
+convert_options([{<<"continuous">>, V} | R]) ->
+    [{continuous, V} | convert_options(R)];
+convert_options([{<<"filter">>, V} | R]) ->
+    [{filter, V} | convert_options(R)];
+convert_options([{<<"query_params">>, V} | R]) ->
+    [{query_params, V} | convert_options(R)];
+convert_options([{<<"doc_ids">>, null} | R]) ->
+    convert_options(R);
+convert_options([{<<"doc_ids">>, V} | _R]) when not is_list(V) ->
+    throw({bad_request, <<"parameter `doc_ids` must be an array">>});
+convert_options([{<<"doc_ids">>, V} | R]) ->
+    % Ensure same behaviour as old replicator: accept a list of percent
+    % encoded doc IDs.
+    DocIds = lists:usort([?l2b(couch_httpd:unquote(Id)) || Id <- V]),
+    [{doc_ids, DocIds} | convert_options(R)];
+convert_options([{<<"selector">>, V} | _R]) when not is_tuple(V) ->
+    throw({bad_request, <<"parameter `selector` must be a JSON object">>});
+convert_options([{<<"selector">>, V} | R]) ->
+    [{selector, V} | convert_options(R)];
+convert_options([{<<"worker_processes">>, V} | R]) ->
+    [{worker_processes, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([{<<"worker_batch_size">>, V} | R]) ->
+    [{worker_batch_size, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([{<<"http_connections">>, V} | R]) ->
+    [{http_connections, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([{<<"connection_timeout">>, V} | R]) ->
+    [{connection_timeout, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([{<<"retries_per_request">>, V} | R]) ->
+    [{retries, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([{<<"socket_options">>, V} | R]) ->
+    {ok, SocketOptions} = couch_util:parse_term(V),
+    [{socket_options, SocketOptions} | convert_options(R)];
+convert_options([{<<"since_seq">>, V} | R]) ->
+    [{since_seq, V} | convert_options(R)];
+convert_options([{<<"use_checkpoints">>, V} | R]) ->
+    [{use_checkpoints, V} | convert_options(R)];
+convert_options([{<<"checkpoint_interval">>, V} | R]) ->
+    [{checkpoint_interval, couch_util:to_integer(V)} | convert_options(R)];
+convert_options([_ | R]) -> % skip unknown option
+    convert_options(R).
+
+
+-spec check_options([_]) -> [_].
+check_options(Options) ->
+    DocIds = lists:keyfind(doc_ids, 1, Options),
+    Filter = lists:keyfind(filter, 1, Options),
+    Selector = lists:keyfind(selector, 1, Options),
+    case {DocIds, Filter, Selector} of
+        {false, false, false} -> Options;
+        {false, false, _} -> Options;
+        {false, _, false} -> Options;
+        {_, false, false} -> Options;
+        _ ->
+            throw({bad_request,
+                "`doc_ids`,`filter`,`selector` are mutually exclusive"})
+    end.
+
+
+-spec parse_proxy_params(binary() | [_]) -> [_].
+parse_proxy_params(ProxyUrl) when is_binary(ProxyUrl) ->
+    parse_proxy_params(?b2l(ProxyUrl));
+parse_proxy_params([]) ->
+    [];
+parse_proxy_params(ProxyUrl) ->
+    #url{
+        host = Host,
+        port = Port,
+        username = User,
+        password = Passwd,
+        protocol = Protocol
+    } = ibrowse_lib:parse_url(ProxyUrl),
+    [
+        {proxy_protocol, Protocol},
+        {proxy_host, Host},
+        {proxy_port, Port}
+    ] ++ case is_list(User) andalso is_list(Passwd) of
+        false ->
+            [];
+        true ->
+            [{proxy_user, User}, {proxy_password, Passwd}]
+        end.
+
+
+-spec ssl_params([_]) -> [_].
+ssl_params(Url) ->
+    case ibrowse_lib:parse_url(Url) of
+    #url{protocol = https} ->
+        Depth = list_to_integer(
+            config:get("replicator", "ssl_certificate_max_depth", "3")
+        ),
+        VerifyCerts = config:get("replicator", "verify_ssl_certificates"),
+        CertFile = config:get("replicator", "cert_file", undefined),
+        KeyFile = config:get("replicator", "key_file", undefined),
+        Password = config:get("replicator", "password", undefined),
+        SslOpts = [{depth, Depth} | ssl_verify_options(VerifyCerts =:= "true")],
+        SslOpts1 = case CertFile /= undefined andalso KeyFile /= undefined of
+            true ->
+                case Password of
+                    undefined ->
+                        [{certfile, CertFile}, {keyfile, KeyFile}] ++ SslOpts;
+                    _ ->
+                        [{certfile, CertFile}, {keyfile, KeyFile},
+                            {password, Password}] ++ SslOpts
+                end;
+            false -> SslOpts
+        end,
+        [{is_ssl, true}, {ssl_options, SslOpts1}];
+    #url{protocol = http} ->
+        []
+    end.
+
+
+-spec ssl_verify_options(true | false) -> [_].
+ssl_verify_options(true) ->
+    CAFile = config:get("replicator", "ssl_trusted_certificates_file"),
+    [{verify, verify_peer}, {cacertfile, CAFile}];
+ssl_verify_options(false) ->
+    [{verify, verify_none}].
+
+
+-spec before_doc_update(#doc{}, #db{}) -> #doc{}.
+before_doc_update(#doc{id = <<?DESIGN_DOC_PREFIX, _/binary>>} = Doc, _Db) ->
+    Doc;
+before_doc_update(#doc{body = {Body}} = Doc, #db{user_ctx=UserCtx} = Db) ->
+    #user_ctx{roles = Roles, name = Name} = UserCtx,
+    case lists:member(<<"_replicator">>, Roles) of
+    true ->
+        Doc;
+    false ->
+        case couch_util:get_value(?OWNER, Body) of
+        undefined ->
+            Doc#doc{body = {?replace(Body, ?OWNER, Name)}};
+        Name ->
+            Doc;
+        Other ->
+            case (catch couch_db:check_is_admin(Db)) of
+            ok when Other =:= null ->
+                Doc#doc{body = {?replace(Body, ?OWNER, Name)}};
+            ok ->
+                Doc;
+            _ ->
+                throw({forbidden, <<"Can't update replication documents",
+                    " from other users.">>})
+            end
+        end
+    end.
+
+
+-spec after_doc_read(#doc{}, #db{}) -> #doc{}.
+after_doc_read(#doc{id = <<?DESIGN_DOC_PREFIX, _/binary>>} = Doc, _Db) ->
+    Doc;
+after_doc_read(#doc{body = {Body}} = Doc, #db{user_ctx=UserCtx} = Db) ->
+    #user_ctx{name = Name} = UserCtx,
+    case (catch couch_db:check_is_admin(Db)) of
+    ok ->
+        Doc;
+    _ ->
+        case couch_util:get_value(?OWNER, Body) of
+        Name ->
+            Doc;
+        _Other ->
+            Source = strip_credentials(couch_util:get_value(<<"source">>,
+Body)),
+            Target = strip_credentials(couch_util:get_value(<<"target">>,
+Body)),
+            NewBody0 = ?replace(Body, <<"source">>, Source),
+            NewBody = ?replace(NewBody0, <<"target">>, Target),
+            #doc{revs = {Pos, [_ | Revs]}} = Doc,
+            NewDoc = Doc#doc{body = {NewBody}, revs = {Pos - 1, Revs}},
+            NewRevId = couch_db:new_revid(NewDoc),
+            NewDoc#doc{revs = {Pos, [NewRevId | Revs]}}
+        end
+    end.
+
+
+-spec strip_credentials(undefined) -> undefined;
+    (binary()) -> binary();
+    ({[_]}) -> {[_]}.
+strip_credentials(undefined) ->
+    undefined;
+strip_credentials(Url) when is_binary(Url) ->
+    re:replace(Url,
+        "http(s)?://(?:[^:]+):[^@]+@(.*)$",
+        "http\\1://\\2",
+        [{return, binary}]);
+strip_credentials({Props}) ->
+    {lists:keydelete(<<"oauth">>, 1, Props)}.
+
+
+error_reason({shutdown, Error}) ->
+    error_reason(Error);
+error_reason({bad_rep_doc, Reason}) ->
+    to_binary(Reason);
+error_reason({error, {Error, Reason}})
+  when is_atom(Error), is_binary(Reason) ->
+    to_binary(io_lib:format("~s: ~s", [Error, Reason]));
+error_reason({error, Reason}) ->
+    to_binary(Reason);
+error_reason(Reason) ->
+    to_binary(Reason).
+
+
+-ifdef(TEST).
+
+-include_lib("eunit/include/eunit.hrl").
+
+check_options_pass_values_test() ->
+    ?assertEqual(check_options([]), []),
+    ?assertEqual(check_options([baz, {other, fiz}]), [baz, {other, fiz}]),
+    ?assertEqual(check_options([{doc_ids, x}]), [{doc_ids, x}]),
+    ?assertEqual(check_options([{filter, x}]), [{filter, x}]),
+    ?assertEqual(check_options([{selector, x}]), [{selector, x}]).
+
+
+check_options_fail_values_test() ->
+    ?assertThrow({bad_request, _},
+        check_options([{doc_ids, x}, {filter, y}])),
+    ?assertThrow({bad_request, _},
+        check_options([{doc_ids, x}, {selector, y}])),
+    ?assertThrow({bad_request, _},
+        check_options([{filter, x}, {selector, y}])),
+    ?assertThrow({bad_request, _},
+        check_options([{doc_ids, x}, {selector, y}, {filter, z}])).
+
+
+check_convert_options_pass_test() ->
+    ?assertEqual([], convert_options([])),
+    ?assertEqual([], convert_options([{<<"random">>, 42}])),
+    ?assertEqual([{cancel, true}],
+        convert_options([{<<"cancel">>, true}])),
+    ?assertEqual([{create_target, true}],
+        convert_options([{<<"create_target">>, true}])),
+    ?assertEqual([{continuous, true}],
+        convert_options([{<<"continuous">>, true}])),
+    ?assertEqual([{doc_ids, [<<"id">>]}],
+        convert_options([{<<"doc_ids">>, [<<"id">>]}])),
+    ?assertEqual([{selector, {key, value}}],
+        convert_options([{<<"selector">>, {key, value}}])).
+
+
+check_convert_options_fail_test() ->
+    ?assertThrow({bad_request, _},
+        convert_options([{<<"cancel">>, <<"true">>}])),
+    ?assertThrow({bad_request, _},
+        convert_options([{<<"create_target">>, <<"true">>}])),
+    ?assertThrow({bad_request, _},
+        convert_options([{<<"continuous">>, <<"true">>}])),
+    ?assertThrow({bad_request, _},
+        convert_options([{<<"doc_ids">>, not_a_list}])),
+    ?assertThrow({bad_request, _},
+        convert_options([{<<"selector">>, [{key, value}]}])).
+
+-endif.
diff --git a/src/couch_replicator/src/couch_replicator_filters.erl b/src/couch_replicator/src/couch_replicator_filters.erl
new file mode 100644
index 0000000..5668820
--- /dev/null
+++ b/src/couch_replicator/src/couch_replicator_filters.erl
@@ -0,0 +1,214 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_replicator_filters).
+
+-export([
+    parse/1,
+    fetch/4,
+    view_type/2,
+    ejsort/1
+]).
+
+-include_lib("couch/include/couch_db.hrl").
+
+
+% Parse the filter from replication options proplist.
+% Return {ok, {FilterType,...}} | {error, ParseError}.
+% For `user` filter, i.e. filters specified as user code
+% in source database, this code doesn't fetch the filter
+% code, but only returns the name of the filter.
+-spec parse([_]) ->
+    {ok, nil} |
+    {ok, {view, binary(), {[_]}}} |
+    {ok, {user, {binary(), binary()}, {[_]}}} |
+    {ok, {docids, [_]}} |
+    {ok, {mango, {[_]}}} |
+    {error, binary()}.
+parse(Options) ->
+    Filter = couch_util:get_value(filter, Options),
+    DocIds = couch_util:get_value(doc_ids, Options),
+    Selector = couch_util:get_value(selector, Options),
+    case {Filter, DocIds, Selector} of
+        {undefined, undefined, undefined} ->
+            {ok, nil};
+        {<<"_", _/binary>>, undefined, undefined} ->
+            {ok, {view, Filter, query_params(Options)}};
+        {_, undefined, undefined} ->
+            case parse_user_filter(Filter) of
+                {ok, {Doc, FilterName}} ->
+                    {ok, {user, {Doc, FilterName}, query_params(Options)}};
+                {error, Error} ->
+                    {error, Error}
+            end;
+        {undefined, _, undefined} ->
+            {ok, {docids, DocIds}};
+        {undefined, undefined, _} ->
+            {ok, {mango, ejsort(mango_selector:normalize(Selector))}};
+        _ ->
+            Err = "`selector`, `filter` and `doc_ids` are mutually exclusive",
+            {error, list_to_binary(Err)}
+    end.
+
+
+% Fetches body of filter function from source database. Guaranteed to either
+% return {ok, Body} or an {error, Reason}. Also assume this function might
+% block due to network / socket issues for an undeterminted amount of time.
+-spec fetch(binary(), binary(), binary(), #user_ctx{}) ->
+    {ok, {[_]}} | {error, binary()}.
+fetch(DDocName, FilterName, Source, UserCtx) ->
+    {Pid, Ref} = spawn_monitor(fun() ->
+        try fetch_internal(DDocName, FilterName, Source, UserCtx) of
+            Resp ->
+                exit({exit_ok, Resp})
+        catch
+            throw:{fetch_error, Reason} ->
+                exit({exit_fetch_error, Reason});
+            _OtherTag:Reason ->
+                exit({exit_other_error, Reason})
+        end
+    end),
+    receive
+        {'DOWN', Ref, process, Pid, {exit_ok, Resp}} ->
+            {ok, Resp};
+        {'DOWN', Ref, process, Pid, {exit_fetch_error, Reason}} ->
+            {error, Reason};
+        {'DOWN', Ref, process, Pid, {exit_other_error, Reason}} ->
+            {error, couch_util:to_binary(Reason)}
+    end.
+
+
+% Get replication type and view (if any) from replication document props
+-spec view_type([_], [_]) ->
+    {view, {binary(), binary()}} | {db, nil} | {error, binary()}.
+view_type(Props, Options) ->
+    case couch_util:get_value(<<"filter">>, Props) of
+        <<"_view">> ->
+            {QP}  = couch_util:get_value(query_params, Options, {[]}),
+            ViewParam = couch_util:get_value(<<"view">>, QP),
+            case re:split(ViewParam, <<"/">>) of
+                [DName, ViewName] ->
+                    {view, {<< "_design/", DName/binary >>, ViewName}};
+                _ ->
+                    {error, <<"Invalid `view` parameter.">>}
+            end;
+        _ ->
+            {db, nil}
+    end.
+
+
+% Private functions
+
+fetch_internal(DDocName, FilterName, Source, UserCtx) ->
+    Db = case (catch couch_replicator_api_wrap:db_open(Source,
+        [{user_ctx, UserCtx}])) of
+    {ok, Db0} ->
+        Db0;
+    DbError ->
+        DbErrorMsg = io_lib:format("Could not open source database `~s`: ~s",
+           [couch_replicator_api_wrap:db_uri(Source),
+               couch_util:to_binary(DbError)]),
+        throw({fetch_error, iolist_to_binary(DbErrorMsg)})
+    end,
+    try
+        Body = case (catch couch_replicator_api_wrap:open_doc(
+            Db, <<"_design/", DDocName/binary>>, [ejson_body])) of
+        {ok, #doc{body = Body0}} ->
+            Body0;
+        DocError ->
+            DocErrorMsg = io_lib:format(
+                "Couldn't open document `_design/~s` from source "
+                "database `~s`: ~s", [DDocName,
+                couch_replicator_api_wrap:db_uri(Source),
+                couch_util:to_binary(DocError)]
+            ),
+            throw({fetch_error, iolist_to_binary(DocErrorMsg)})
+        end,
+        try
+            Code = couch_util:get_nested_json_value(
+                     Body, [<<"filters">>, FilterName]),
+            re:replace(Code, [$^, "\s*(.*?)\s*", $$], "\\1", [{return, binary}])
+         catch
+             _Tag:CodeError ->
+                 CodeErrorMsg = io_lib:format(
+                     "Couldn't parse filter code from document ~s on `~s` "
+                     " Error: ~s", [DDocName,
+                     couch_replicator_api_wrap:db_uri(Source),
+                     couch_util:to_binary(CodeError)]
+                 ),
+                 throw({fetch_error, CodeErrorMsg})
+         end
+    after
+        couch_replicator_api_wrap:db_close(Db)
+    end.
+
+
+-spec query_params([_]) -> {[_]}.
+query_params(Options)->
+    couch_util:get_value(query_params, Options, {[]}).
+
+
+parse_user_filter(Filter) ->
+    case re:run(Filter, "(.*?)/(.*)", [{capture, [1, 2], binary}]) of
+        {match, [DDocName0, FilterName0]} ->
+            {ok, {DDocName0, FilterName0}};
+        _ ->
+            {error, <<"Invalid filter. Must match `ddocname/filtername`.">>}
+    end.
+
+
+% Sort an EJSON object's properties to attempt
+% to generate a unique representation. This is used
+% to reduce the chance of getting different
+% replication checkpoints for the same Mango selector
+ejsort({V})->
+    ejsort_props(V, []);
+ejsort(V) when is_list(V) ->
+    ejsort_array(V, []);
+ejsort(V) ->
+    V.
+
+
+ejsort_props([], Acc)->
+    {lists:keysort(1, Acc)};
+ejsort_props([{K, V}| R], Acc) ->
+    ejsort_props(R, [{K, ejsort(V)} | Acc]).
+
+
+ejsort_array([], Acc)->
+    lists:reverse(Acc);
+ejsort_array([V | R], Acc) ->
+    ejsort_array(R, [ejsort(V) | Acc]).
+
+
+-ifdef(TEST).
+
+-include_lib("eunit/include/eunit.hrl").
+
+ejsort_basic_values_test() ->
+    ?assertEqual(ejsort(0), 0),
+    ?assertEqual(ejsort(<<"a">>), <<"a">>),
+    ?assertEqual(ejsort(true), true),
+    ?assertEqual(ejsort([]), []),
+    ?assertEqual(ejsort({[]}), {[]}).
+
+
+ejsort_compound_values_test() ->
+    ?assertEqual(ejsort([2, 1, 3, <<"a">>]), [2, 1, 3, <<"a">>]),
+    Ej1 = {[{<<"a">>, 0}, {<<"c">>, 0},  {<<"b">>, 0}]},
+    Ej1s =  {[{<<"a">>, 0}, {<<"b">>, 0}, {<<"c">>, 0}]},
+    ?assertEqual(ejsort(Ej1), Ej1s),
+    Ej2 = {[{<<"x">>, Ej1}, {<<"z">>, Ej1}, {<<"y">>, [Ej1, Ej1]}]},
+    ?assertEqual(ejsort(Ej2),
+        {[{<<"x">>, Ej1s}, {<<"y">>, [Ej1s, Ej1s]}, {<<"z">>, Ej1s}]}).
+
+-endif.
diff --git a/src/couch_replicator/src/couch_replicator_ids.erl b/src/couch_replicator/src/couch_replicator_ids.erl
new file mode 100644
index 0000000..7f26db7
--- /dev/null
+++ b/src/couch_replicator/src/couch_replicator_ids.erl
@@ -0,0 +1,127 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_replicator_ids).
+
+-export([
+    replication_id/1,
+    replication_id/2,
+    convert/1
+]).
+
+-include_lib("couch/include/couch_db.hrl").
+-include("couch_replicator_api_wrap.hrl").
+-include("couch_replicator.hrl").
+
+% replication_id/1 and replication_id/2 will attempt to fetch
+% filter code for filtered replications. If fetching or parsing
+% of the remotely fetched filter code fails they throw:
+%  {filter_fetch_error, Error} exception.
+%
+
+replication_id(#rep{options = Options} = Rep) ->
+    BaseId = replication_id(Rep, ?REP_ID_VERSION),
+    {BaseId, maybe_append_options([continuous, create_target], Options)}.
+
+
+% Versioned clauses for generating replication IDs.
+% If a change is made to how replications are identified,
+% please add a new clause and increase ?REP_ID_VERSION.
+
+replication_id(#rep{user_ctx = UserCtx} = Rep, 3) ->
+    UUID = couch_server:get_uuid(),
+    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
+    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
+    maybe_append_filters([UUID, Src, Tgt], Rep);
+
+replication_id(#rep{user_ctx = UserCtx} = Rep, 2) ->
+    {ok, HostName} = inet:gethostname(),
+    Port = case (catch mochiweb_socket_server:get(couch_httpd, port)) of
+    P when is_number(P) ->
+        P;
+    _ ->
+        % On restart we might be called before the couch_httpd process is
+        % started.
+        % TODO: we might be under an SSL socket server only, or both under
+        % SSL and a non-SSL socket.
+        % ... mochiweb_socket_server:get(https, port)
+        list_to_integer(config:get("httpd", "port", "5984"))
+    end,
+    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
+    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
+    maybe_append_filters([HostName, Port, Src, Tgt], Rep);
+
+replication_id(#rep{user_ctx = UserCtx} = Rep, 1) ->
+    {ok, HostName} = inet:gethostname(),
+    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
+    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
+    maybe_append_filters([HostName, Src, Tgt], Rep).
+
+
+-spec convert([_] | binary() | {string(), string()}) -> {string(), string()}.
+convert(Id) when is_list(Id) ->
+    convert(?l2b(Id));
+convert(Id) when is_binary(Id) ->
+    lists:splitwith(fun(Char) -> Char =/= $+ end, ?b2l(Id));
+convert({BaseId, Ext} = Id) when is_list(BaseId), is_list(Ext) ->
+    Id.
+
+
+% Private functions
+
+maybe_append_filters(Base,
+        #rep{source = Source, user_ctx = UserCtx, options = Options}) ->
+    Base2 = Base ++
+        case couch_replicator_filters:parse(Options) of
+        {ok, nil} ->
+            [];
+        {ok, {view, Filter, QueryParams}} ->
+            [Filter, QueryParams];
+        {ok, {user, {Doc, Filter}, QueryParams}} ->
+            case couch_replicator_filters:fetch(Doc, Filter, Source, UserCtx) of
+                {ok, Code} ->
+                    [Code, QueryParams];
+                {error, Error} ->
+                    throw({filter_fetch_error, Error})
+            end;
+        {ok, {docids, DocIds}} ->
+            [DocIds];
+        {ok, {mango, Selector}} ->
+            [Selector];
+        {error, FilterParseError} ->
+            throw({error, FilterParseError})
+        end,
+    couch_util:to_hex(couch_crypto:hash(md5, term_to_binary(Base2))).
+
+
+maybe_append_options(Options, RepOptions) ->
+    lists:foldl(fun(Option, Acc) ->
+        Acc ++
+        case couch_util:get_value(Option, RepOptions, false) of
+        true ->
+            "+" ++ atom_to_list(Option);
+        false ->
+            ""
+        end
+    end, [], Options).
+
+
+get_rep_endpoint(_UserCtx, #httpdb{url=Url, headers=Headers, oauth=OAuth}) ->
+    DefaultHeaders = (#httpdb{})#httpdb.headers,
+    case OAuth of
+    nil ->
+        {remote, Url, Headers -- DefaultHeaders};
+    #oauth{} ->
+        {remote, Url, Headers -- DefaultHeaders, OAuth}
+    end;
+get_rep_endpoint(UserCtx, <<DbName/binary>>) ->
+    {local, DbName, UserCtx}.
diff --git a/src/couch_replicator/src/couch_replicator_utils.erl b/src/couch_replicator/src/couch_replicator_utils.erl
index e96d52a..05836d4 100644
--- a/src/couch_replicator/src/couch_replicator_utils.erl
+++ b/src/couch_replicator/src/couch_replicator_utils.erl
@@ -12,17 +12,28 @@
 
 -module(couch_replicator_utils).
 
--export([parse_rep_doc/2]).
--export([open_db/1, close_db/1]).
--export([start_db_compaction_notifier/2, stop_db_compaction_notifier/1]).
--export([replication_id/2]).
--export([sum_stats/2, is_deleted/1]).
+-export([
+   parse_rep_doc/2,
+   open_db/1,
+   close_db/1,
+   start_db_compaction_notifier/2,
+   stop_db_compaction_notifier/1,
+   replication_id/2,
+   sum_stats/2,
+   is_deleted/1,
+   rep_error_to_binary/1,
+   get_json_value/2,
+   get_json_value/3,
+   pp_rep_id/1,
+   iso8601/1,
+   filter_state/3
+]).
 
--export([handle_db_event/3]).
+-export([
+    handle_db_event/3
+]).
 
 -include_lib("couch/include/couch_db.hrl").
--include_lib("ibrowse/include/ibrowse.hrl").
--include("couch_replicator_api_wrap.hrl").
 -include("couch_replicator.hrl").
 
 -import(couch_util, [
@@ -31,385 +42,6 @@
 ]).
 
 
-parse_rep_doc({Props}, UserCtx) ->
-    ProxyParams = parse_proxy_params(get_value(<<"proxy">>, Props, <<>>)),
-    Options = make_options(Props),
-    case get_value(cancel, Options, false) andalso
-        (get_value(id, Options, nil) =/= nil) of
-    true ->
-        {ok, #rep{options = Options, user_ctx = UserCtx}};
-    false ->
-        Source = parse_rep_db(get_value(<<"source">>, Props),
-                              ProxyParams, Options),
-        Target = parse_rep_db(get_value(<<"target">>, Props),
-                              ProxyParams, Options),
-
-
-        {RepType, View} = case get_value(<<"filter">>, Props) of
-                <<"_view">> ->
-                    {QP}  = get_value(query_params, Options, {[]}),
-                    ViewParam = get_value(<<"view">>, QP),
-                    View1 = case re:split(ViewParam, <<"/">>) of
-                        [DName, ViewName] ->
-                            {<< "_design/", DName/binary >>, ViewName};
-                        _ ->
-                            throw({bad_request, "Invalid `view` parameter."})
-                    end,
-                    {view, View1};
-                _ ->
-                    {db, nil}
-            end,
-
-        Rep = #rep{
-            source = Source,
-            target = Target,
-            options = Options,
-            user_ctx = UserCtx,
-            type = RepType,
-            view = View,
-            doc_id = get_value(<<"_id">>, Props, null)
-        },
-        {ok, Rep#rep{id = replication_id(Rep)}}
-    end.
-
-
-replication_id(#rep{options = Options} = Rep) ->
-    BaseId = replication_id(Rep, ?REP_ID_VERSION),
-    {BaseId, maybe_append_options([continuous, create_target], Options)}.
-
-
-% Versioned clauses for generating replication IDs.
-% If a change is made to how replications are identified,
-% please add a new clause and increase ?REP_ID_VERSION.
-
-replication_id(#rep{user_ctx = UserCtx} = Rep, 3) ->
-    UUID = couch_server:get_uuid(),
-    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
-    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
-    maybe_append_filters([UUID, Src, Tgt], Rep);
-
-replication_id(#rep{user_ctx = UserCtx} = Rep, 2) ->
-    {ok, HostName} = inet:gethostname(),
-    Port = case (catch mochiweb_socket_server:get(couch_httpd, port)) of
-    P when is_number(P) ->
-        P;
-    _ ->
-        % On restart we might be called before the couch_httpd process is
-        % started.
-        % TODO: we might be under an SSL socket server only, or both under
-        % SSL and a non-SSL socket.
-        % ... mochiweb_socket_server:get(https, port)
-        list_to_integer(config:get("httpd", "port", "5984"))
-    end,
-    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
-    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
-    maybe_append_filters([HostName, Port, Src, Tgt], Rep);
-
-replication_id(#rep{user_ctx = UserCtx} = Rep, 1) ->
-    {ok, HostName} = inet:gethostname(),
-    Src = get_rep_endpoint(UserCtx, Rep#rep.source),
-    Tgt = get_rep_endpoint(UserCtx, Rep#rep.target),
-    maybe_append_filters([HostName, Src, Tgt], Rep).
-
-
-maybe_append_filters(Base,
-        #rep{source = Source, user_ctx = UserCtx, options = Options}) ->
-    Filter = get_value(filter, Options),
-    DocIds = get_value(doc_ids, Options),
-    Selector = get_value(selector, Options),
-    Base2 = Base ++
-        case {Filter, DocIds, Selector} of
-        {undefined, undefined, undefined} ->
-            [];
-        {<<"_", _/binary>>, undefined, undefined} ->
-            [Filter, get_value(query_params, Options, {[]})];
-        {_, undefined, undefined} ->
-            [filter_code(Filter, Source, UserCtx),
-                get_value(query_params, Options, {[]})];
-        {undefined, _, undefined} ->
-            [DocIds];
-        {undefined, undefined, _} ->
-            [ejsort(mango_selector:normalize(Selector))];
-        _ ->
-            throw({error, <<"`selector`, `filter` and `doc_ids` fields are mutually exclusive">>})
-        end,
-    couch_util:to_hex(couch_crypto:hash(md5, term_to_binary(Base2))).
-
-
-filter_code(Filter, Source, UserCtx) ->
-    {DDocName, FilterName} =
-    case re:run(Filter, "(.*?)/(.*)", [{capture, [1, 2], binary}]) of
-    {match, [DDocName0, FilterName0]} ->
-        {DDocName0, FilterName0};
-    _ ->
-        throw({error, <<"Invalid filter. Must match `ddocname/filtername`.">>})
-    end,
-    Db = case (catch couch_replicator_api_wrap:db_open(Source, [{user_ctx, UserCtx}])) of
-    {ok, Db0} ->
-        Db0;
-    DbError ->
-        DbErrorMsg = io_lib:format("Could not open source database `~s`: ~s",
-           [couch_replicator_api_wrap:db_uri(Source), couch_util:to_binary(DbError)]),
-        throw({error, iolist_to_binary(DbErrorMsg)})
-    end,
-    try
-        Body = case (catch couch_replicator_api_wrap:open_doc(
-            Db, <<"_design/", DDocName/binary>>, [ejson_body])) of
-        {ok, #doc{body = Body0}} ->
-            Body0;
-        DocError ->
-            DocErrorMsg = io_lib:format(
-                "Couldn't open document `_design/~s` from source "
-                "database `~s`: ~s", [DDocName, couch_replicator_api_wrap:db_uri(Source),
-                    couch_util:to_binary(DocError)]),
-            throw({error, iolist_to_binary(DocErrorMsg)})
-        end,
-        Code = couch_util:get_nested_json_value(
-            Body, [<<"filters">>, FilterName]),
-        re:replace(Code, [$^, "\s*(.*?)\s*", $$], "\\1", [{return, binary}])
-    after
-        couch_replicator_api_wrap:db_close(Db)
-    end.
-
-
-maybe_append_options(Options, RepOptions) ->
-    lists:foldl(fun(Option, Acc) ->
-        Acc ++
-        case get_value(Option, RepOptions, false) of
-        true ->
-            "+" ++ atom_to_list(Option);
-        false ->
-            ""
-        end
-    end, [], Options).
-
-
-get_rep_endpoint(_UserCtx, #httpdb{url=Url, headers=Headers, oauth=OAuth}) ->
-    DefaultHeaders = (#httpdb{})#httpdb.headers,
-    case OAuth of
-    nil ->
-        {remote, Url, Headers -- DefaultHeaders};
-    #oauth{} ->
-        {remote, Url, Headers -- DefaultHeaders, OAuth}
-    end;
-get_rep_endpoint(UserCtx, <<DbName/binary>>) ->
-    {local, DbName, UserCtx}.
-
-
-parse_rep_db({Props}, ProxyParams, Options) ->
-    Url = maybe_add_trailing_slash(get_value(<<"url">>, Props)),
-    {AuthProps} = get_value(<<"auth">>, Props, {[]}),
-    {BinHeaders} = get_value(<<"headers">>, Props, {[]}),
-    Headers = lists:ukeysort(1, [{?b2l(K), ?b2l(V)} || {K, V} <- BinHeaders]),
-    DefaultHeaders = (#httpdb{})#httpdb.headers,
-    OAuth = case get_value(<<"oauth">>, AuthProps) of
-    undefined ->
-        nil;
-    {OauthProps} ->
-        #oauth{
-            consumer_key = ?b2l(get_value(<<"consumer_key">>, OauthProps)),
-            token = ?b2l(get_value(<<"token">>, OauthProps)),
-            token_secret = ?b2l(get_value(<<"token_secret">>, OauthProps)),
-            consumer_secret = ?b2l(get_value(<<"consumer_secret">>, OauthProps)),
-            signature_method =
-                case get_value(<<"signature_method">>, OauthProps) of
-                undefined ->        hmac_sha1;
-                <<"PLAINTEXT">> ->  plaintext;
-                <<"HMAC-SHA1">> ->  hmac_sha1;
-                <<"RSA-SHA1">> ->   rsa_sha1
-                end
-        }
-    end,
-    #httpdb{
-        url = Url,
-        oauth = OAuth,
-        headers = lists:ukeymerge(1, Headers, DefaultHeaders),
-        ibrowse_options = lists:keysort(1,
-            [{socket_options, get_value(socket_options, Options)} |
-                ProxyParams ++ ssl_params(Url)]),
-        timeout = get_value(connection_timeout, Options),
-        http_connections = get_value(http_connections, Options),
-        retries = get_value(retries, Options)
-    };
-parse_rep_db(<<"http://", _/binary>> = Url, ProxyParams, Options) ->
-    parse_rep_db({[{<<"url">>, Url}]}, ProxyParams, Options);
-parse_rep_db(<<"https://", _/binary>> = Url, ProxyParams, Options) ->
-    parse_rep_db({[{<<"url">>, Url}]}, ProxyParams, Options);
-parse_rep_db(<<DbName/binary>>, _ProxyParams, _Options) ->
-    DbName.
-
-
-maybe_add_trailing_slash(Url) when is_binary(Url) ->
-    maybe_add_trailing_slash(?b2l(Url));
-maybe_add_trailing_slash(Url) ->
-    case lists:last(Url) of
-    $/ ->
-        Url;
-    _ ->
-        Url ++ "/"
-    end.
-
-
-make_options(Props) ->
-    Options0 = lists:ukeysort(1, convert_options(Props)),
-    Options = check_options(Options0),
-    DefWorkers = config:get("replicator", "worker_processes", "4"),
-    DefBatchSize = config:get("replicator", "worker_batch_size", "500"),
-    DefConns = config:get("replicator", "http_connections", "20"),
-    DefTimeout = config:get("replicator", "connection_timeout", "30000"),
-    DefRetries = config:get("replicator", "retries_per_request", "10"),
-    UseCheckpoints = config:get("replicator", "use_checkpoints", "true"),
-    DefCheckpointInterval = config:get("replicator", "checkpoint_interval", "30000"),
-    {ok, DefSocketOptions} = couch_util:parse_term(
-        config:get("replicator", "socket_options",
-            "[{keepalive, true}, {nodelay, false}]")),
-    lists:ukeymerge(1, Options, lists:keysort(1, [
-        {connection_timeout, list_to_integer(DefTimeout)},
-        {retries, list_to_integer(DefRetries)},
-        {http_connections, list_to_integer(DefConns)},
-        {socket_options, DefSocketOptions},
-        {worker_batch_size, list_to_integer(DefBatchSize)},
-        {worker_processes, list_to_integer(DefWorkers)},
-        {use_checkpoints, list_to_existing_atom(UseCheckpoints)},
-        {checkpoint_interval, list_to_integer(DefCheckpointInterval)}
-    ])).
-
-
-convert_options([])->
-    [];
-convert_options([{<<"cancel">>, V} | _R]) when not is_boolean(V)->
-    throw({bad_request, <<"parameter `cancel` must be a boolean">>});
-convert_options([{<<"cancel">>, V} | R]) ->
-    [{cancel, V} | convert_options(R)];
-convert_options([{IdOpt, V} | R]) when IdOpt =:= <<"_local_id">>;
-        IdOpt =:= <<"replication_id">>; IdOpt =:= <<"id">> ->
-    Id = lists:splitwith(fun(X) -> X =/= $+ end, ?b2l(V)),
-    [{id, Id} | convert_options(R)];
-convert_options([{<<"create_target">>, V} | _R]) when not is_boolean(V)->
-    throw({bad_request, <<"parameter `create_target` must be a boolean">>});
-convert_options([{<<"create_target">>, V} | R]) ->
-    [{create_target, V} | convert_options(R)];
-convert_options([{<<"continuous">>, V} | _R]) when not is_boolean(V)->
-    throw({bad_request, <<"parameter `continuous` must be a boolean">>});
-convert_options([{<<"continuous">>, V} | R]) ->
-    [{continuous, V} | convert_options(R)];
-convert_options([{<<"filter">>, V} | R]) ->
-    [{filter, V} | convert_options(R)];
-convert_options([{<<"query_params">>, V} | R]) ->
-    [{query_params, V} | convert_options(R)];
-convert_options([{<<"doc_ids">>, null} | R]) ->
-    convert_options(R);
-convert_options([{<<"doc_ids">>, V} | _R]) when not is_list(V) ->
-    throw({bad_request, <<"parameter `doc_ids` must be an array">>});
-convert_options([{<<"doc_ids">>, V} | R]) ->
-    % Ensure same behaviour as old replicator: accept a list of percent
-    % encoded doc IDs.
-    DocIds = [?l2b(couch_httpd:unquote(Id)) || Id <- V],
-    [{doc_ids, DocIds} | convert_options(R)];
-convert_options([{<<"selector">>, V} | _R]) when not is_tuple(V) ->
-    throw({bad_request, <<"parameter `selector` must be a JSON object">>});
-convert_options([{<<"selector">>, V} | R]) ->
-    [{selector, V} | convert_options(R)];
-convert_options([{<<"worker_processes">>, V} | R]) ->
-    [{worker_processes, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([{<<"worker_batch_size">>, V} | R]) ->
-    [{worker_batch_size, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([{<<"http_connections">>, V} | R]) ->
-    [{http_connections, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([{<<"connection_timeout">>, V} | R]) ->
-    [{connection_timeout, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([{<<"retries_per_request">>, V} | R]) ->
-    [{retries, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([{<<"socket_options">>, V} | R]) ->
-    {ok, SocketOptions} = couch_util:parse_term(V),
-    [{socket_options, SocketOptions} | convert_options(R)];
-convert_options([{<<"since_seq">>, V} | R]) ->
-    [{since_seq, V} | convert_options(R)];
-convert_options([{<<"use_checkpoints">>, V} | R]) ->
-    [{use_checkpoints, V} | convert_options(R)];
-convert_options([{<<"checkpoint_interval">>, V} | R]) ->
-    [{checkpoint_interval, couch_util:to_integer(V)} | convert_options(R)];
-convert_options([_ | R]) -> % skip unknown option
-    convert_options(R).
-
-check_options(Options) ->
-    DocIds = lists:keyfind(doc_ids, 1, Options),
-    Filter = lists:keyfind(filter, 1, Options),
-    Selector = lists:keyfind(selector, 1, Options),
-    case {DocIds, Filter, Selector} of
-        {false, false, false} -> Options;
-        {false, false, _} -> Options;
-        {false, _, false} -> Options;
-        {_, false, false} -> Options;
-        _ ->
-            throw({bad_request, "`doc_ids`, `filter`, `selector` are mutually exclusive options"})
-    end.
-
-
-parse_proxy_params(ProxyUrl) when is_binary(ProxyUrl) ->
-    parse_proxy_params(?b2l(ProxyUrl));
-parse_proxy_params([]) ->
-    [];
-parse_proxy_params(ProxyUrl) ->
-    #url{
-        host = Host,
-        port = Port,
-        username = User,
-        password = Passwd,
-        protocol = Protocol
-    } = ibrowse_lib:parse_url(ProxyUrl),
-    [{proxy_protocol, Protocol}, {proxy_host, Host}, {proxy_port, Port}] ++
-        case is_list(User) andalso is_list(Passwd) of
-        false ->
-            [];
-        true ->
-            [{proxy_user, User}, {proxy_password, Passwd}]
-        end.
-
-
-ssl_params(Url) ->
-    case ibrowse_lib:parse_url(Url) of
-    #url{protocol = https} ->
-        Depth = list_to_integer(
-            config:get("replicator", "ssl_certificate_max_depth", "3")
-        ),
-        VerifyCerts = config:get("replicator", "verify_ssl_certificates"),
-        CertFile = config:get("replicator", "cert_file", undefined),
-        KeyFile = config:get("replicator", "key_file", undefined),
-        Password = config:get("replicator", "password", undefined),
-        SslOpts = [{depth, Depth} | ssl_verify_options(VerifyCerts =:= "true")],
-        SslOpts1 = case CertFile /= undefined andalso KeyFile /= undefined of
-            true ->
-                case Password of
-                    undefined ->
-                        [{certfile, CertFile}, {keyfile, KeyFile}] ++ SslOpts;
-                    _ ->
-                        [{certfile, CertFile}, {keyfile, KeyFile},
-                            {password, Password}] ++ SslOpts
-                end;
-            false -> SslOpts
-        end,
-        [{is_ssl, true}, {ssl_options, SslOpts1}];
-    #url{protocol = http} ->
-        []
-    end.
-
-ssl_verify_options(Value) ->
-    ssl_verify_options(Value, erlang:system_info(otp_release)).
-
-ssl_verify_options(true, OTPVersion) when OTPVersion >= "R14" ->
-    CAFile = config:get("replicator", "ssl_trusted_certificates_file"),
-    [{verify, verify_peer}, {cacertfile, CAFile}];
-ssl_verify_options(false, OTPVersion) when OTPVersion >= "R14" ->
-    [{verify, verify_none}];
-ssl_verify_options(true, _OTPVersion) ->
-    CAFile = config:get("replicator", "ssl_trusted_certificates_file"),
-    [{verify, 2}, {cacertfile, CAFile}];
-ssl_verify_options(false, _OTPVersion) ->
-    [{verify, 0}].
-
-
-%% New db record has Options field removed here to enable smoother dbcore migration
 open_db(#db{name = Name, user_ctx = UserCtx}) ->
     {ok, Db} = couch_db:open(Name, [{user_ctx, UserCtx} | []]),
     Db;
@@ -444,103 +76,90 @@ handle_db_event(DbName, compacted, Server) ->
 handle_db_event(_DbName, _Event, Server) ->
     {ok, Server}.
 
-% Obsolete - remove in next release
+
+rep_error_to_binary(Error) ->
+    couch_util:to_binary(error_reason(Error)).
+
+
+error_reason({shutdown, Error}) ->
+    error_reason(Error);
+error_reason({error, {Error, Reason}})
+  when is_atom(Error), is_binary(Reason) ->
+    io_lib:format("~s: ~s", [Error, Reason]);
+error_reason({error, Reason}) ->
+    Reason;
+error_reason(Reason) ->
+    Reason.
+
+
+get_json_value(Key, Props) ->
+    get_json_value(Key, Props, undefined).
+
+get_json_value(Key, Props, Default) when is_atom(Key) ->
+    Ref = make_ref(),
+    case get_value(Key, Props, Ref) of
+        Ref ->
+            get_value(?l2b(atom_to_list(Key)), Props, Default);
+        Else ->
+            Else
+    end;
+get_json_value(Key, Props, Default) when is_binary(Key) ->
+    Ref = make_ref(),
+    case get_value(Key, Props, Ref) of
+        Ref ->
+            get_value(list_to_atom(?b2l(Key)), Props, Default);
+        Else ->
+            Else
+    end.
+
+
+% pretty-print replication id
+-spec pp_rep_id(#rep{} | rep_id()) -> string().
+pp_rep_id(#rep{id = RepId}) ->
+    pp_rep_id(RepId);
+pp_rep_id({Base, Extension}) ->
+    Base ++ Extension.
+
+
+% NV: TODO: this function is not used outside api wrap module
+% consider moving it there during final cleanup
+is_deleted(Change) ->
+    get_json_value(<<"deleted">>, Change, false).
+
+
+% NV: TODO: proxy some functions which used to be here, later remove
+% these and replace calls to their respective modules
+replication_id(Rep, Version) ->
+    couch_replicator_ids:replication_id(Rep, Version).
+
+
 sum_stats(S1, S2) ->
     couch_replicator_stats:sum_stats(S1, S2).
 
-is_deleted(Change) ->
-    case couch_util:get_value(<<"deleted">>, Change) of
-    undefined ->
-        % keep backwards compatibility for a while
-        couch_util:get_value(deleted, Change, false);
-    Else ->
-        Else
-    end.
 
+parse_rep_doc(Props, UserCtx) ->
+    couch_replicator_docs:parse_rep_doc(Props, UserCtx).
 
-% Sort an EJSON object's properties to attempt
-% to generate a unique representation. This is used
-% to reduce the chance of getting different
-% replication checkpoints for the same Mango selector
-ejsort({V})->
-    ejsort_props(V, []);
-ejsort(V) when is_list(V) ->
-    ejsort_array(V, []);
-ejsort(V) ->
-    V.
-
-ejsort_props([], Acc)->
-    {lists:keysort(1, Acc)};
-ejsort_props([{K, V}| R], Acc) ->
-    ejsort_props(R, [{K, ejsort(V)} | Acc]).
-
-ejsort_array([], Acc)->
-    lists:reverse(Acc);
-ejsort_array([V | R], Acc) ->
-    ejsort_array(R, [ejsort(V) | Acc]).
-
-
--ifdef(TEST).
-
--include_lib("eunit/include/eunit.hrl").
-
-ejsort_basic_values_test() ->
-    ?assertEqual(ejsort(0), 0),
-    ?assertEqual(ejsort(<<"a">>), <<"a">>),
-    ?assertEqual(ejsort(true), true),
-    ?assertEqual(ejsort([]), []),
-    ?assertEqual(ejsort({[]}), {[]}).
-
-ejsort_compound_values_test() ->
-    ?assertEqual(ejsort([2, 1, 3 ,<<"a">>]), [2, 1, 3, <<"a">>]),
-    Ej1 = {[{<<"a">>, 0}, {<<"c">>, 0},  {<<"b">>, 0}]},
-    Ej1s =  {[{<<"a">>, 0}, {<<"b">>, 0}, {<<"c">>, 0}]},
-    ?assertEqual(ejsort(Ej1), Ej1s),
-    Ej2 = {[{<<"x">>, Ej1}, {<<"z">>, Ej1}, {<<"y">>, [Ej1, Ej1]}]},
-    ?assertEqual(ejsort(Ej2),
-        {[{<<"x">>, Ej1s}, {<<"y">>, [Ej1s, Ej1s]}, {<<"z">>, Ej1s}]}).
-
-check_options_pass_values_test() ->
-    ?assertEqual(check_options([]), []),
-    ?assertEqual(check_options([baz, {other,fiz}]), [baz, {other, fiz}]),
-    ?assertEqual(check_options([{doc_ids, x}]), [{doc_ids, x}]),
-    ?assertEqual(check_options([{filter, x}]), [{filter, x}]),
-    ?assertEqual(check_options([{selector, x}]), [{selector, x}]).
-
-check_options_fail_values_test() ->
-    ?assertThrow({bad_request, _},
-        check_options([{doc_ids, x}, {filter, y}])),
-    ?assertThrow({bad_request, _},
-        check_options([{doc_ids, x}, {selector, y}])),
-    ?assertThrow({bad_request, _},
-        check_options([{filter, x}, {selector, y}])),
-    ?assertThrow({bad_request, _},
-        check_options([{doc_ids, x}, {selector, y}, {filter, z}])).
-
-check_convert_options_pass_test() ->
-    ?assertEqual([], convert_options([])),
-    ?assertEqual([], convert_options([{<<"random">>, 42}])),
-    ?assertEqual([{cancel, true}],
-        convert_options([{<<"cancel">>, true}])),
-    ?assertEqual([{create_target, true}],
-        convert_options([{<<"create_target">>, true}])),
-    ?assertEqual([{continuous, true}],
-        convert_options([{<<"continuous">>, true}])),
-    ?assertEqual([{doc_ids, [<<"id">>]}],
-        convert_options([{<<"doc_ids">>, [<<"id">>]}])),
-    ?assertEqual([{selector, {key, value}}],
-        convert_options([{<<"selector">>, {key, value}}])).
-
-check_convert_options_fail_test() ->
-    ?assertThrow({bad_request, _},
-        convert_options([{<<"cancel">>, <<"true">>}])),
-    ?assertThrow({bad_request, _},
-        convert_options([{<<"create_target">>, <<"true">>}])),
-    ?assertThrow({bad_request, _},
-        convert_options([{<<"continuous">>, <<"true">>}])),
-    ?assertThrow({bad_request, _},
-        convert_options([{<<"doc_ids">>, not_a_list}])),
-    ?assertThrow({bad_request, _},
-        convert_options([{<<"selector">>, [{key, value}]}])).
-
--endif.
+
+-spec iso8601(erlang:timestamp()) -> binary().
+iso8601({_Mega, _Sec, _Micro} = Timestamp) ->
+    {{Y, Mon, D}, {H, Min, S}} = calendar:now_to_universal_time(Timestamp),
+    Format = "~B-~2..0B-~2..0BT~2..0B:~2..0B:~2..0BZ",
+    iolist_to_binary(io_lib:format(Format, [Y, Mon, D, H, Min, S])).
+
+
+%% Filter replication info ejson by state provided. If it matches return
+%% the input value, if it doesn't return 'skip'. This is used from replicator
+%% fabric coordinator and worker.
+-spec filter_state(atom(), [atom()], {[_ | _]}) -> {[_ | _]} | skip.
+filter_state(null = _State, _States, _Info) ->
+    skip;
+filter_state(_ = _State, [] = _States, Info) ->
+    Info;
+filter_state(State, States, Info) ->
+    case lists:member(State, States) of
+        true ->
+            Info;
+        false ->
+            skip
+    end.

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