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From "Yuxuan Wang (Jira)" <j...@apache.org>
Subject [jira] [Commented] (THRIFT-4914) Go: Link between THeader and context object
Date Sat, 19 Oct 2019 03:41:00 GMT

    [ https://issues.apache.org/jira/browse/THRIFT-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955062#comment-16955062
] 

Yuxuan Wang commented on THRIFT-4914:
-------------------------------------

[~dcelasun] Actually I just had a different idea.

I think the main problem we face is that in the server's handler function, user don't have
any easy access to the underlying transport/protocol. What if we embed that into the context
object we passed into the server handler functions? e.g. we provide a new helper function,
similar to GetHeader{{ we have right now, but returns the underlying TTransport/TProtocol/a
new type that gives the user more restricted access, which allows them to set headers to return?}}

> Go: Link between THeader and context object
> -------------------------------------------
>
>                 Key: THRIFT-4914
>                 URL: https://issues.apache.org/jira/browse/THRIFT-4914
>             Project: Thrift
>          Issue Type: New Feature
>          Components: Go - Library
>            Reporter: Yuxuan Wang
>            Priority: Major
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> We have "raw" THeader support for Go in THRIFT-4612 now, the next step would be to make
them more easily accessible.
> The are 2 directions, 4 parts of this ticket:
>  * client -> server (requests)
>  ** Read headers on server
>  ** Write headers on client
>  * server -> client (responses)
>  ** Write headers on server
>  ** Read headers on client
> Take the reading on server as an example. Currently we can read the headers from either
the transport or the protocol, but neither the transport nor the protocol objects are "easily
accessible" when you are writing the business logic code (writing the request handler in the
server code). It would be much better if we inject the headers into the context object passed
into the request handlers.
> We already have code injecting the headers to the context object that lives outside of
the thrift library working. I'll send out a PR in the coming days to add that to the thrift
library, so the performance would be better (we no longer need to do the extra injecting work),
and it would be a lot easier to use.
> We'll think about how to best do the client writing part (probably auto read the headers
from the context object that passed into the client request code, and write to THeaderProtocol
automatically), and send out a PR soon-ish.
> The other direction, server -> client, is used much less often with headers, so we'll
probably punt on it for now, and come back revisit them in the future.



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