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From j..@apache.org
Subject svn commit: r1767740 - in /apr/apr-util/branches/1.6.x: include/apr_redis.h redis/ redis/apr_redis.c
Date Wed, 02 Nov 2016 17:04:53 GMT
Author: jim
Date: Wed Nov  2 17:04:53 2016
New Revision: 1767740

URL: http://svn.apache.org/viewvc?rev=1767740&view=rev
Log:
Fold in current work-in-progress... Need to next add incr/decr/version
from Credis

Added:
    apr/apr-util/branches/1.6.x/include/apr_redis.h
    apr/apr-util/branches/1.6.x/redis/
    apr/apr-util/branches/1.6.x/redis/apr_redis.c

Added: apr/apr-util/branches/1.6.x/include/apr_redis.h
URL: http://svn.apache.org/viewvc/apr/apr-util/branches/1.6.x/include/apr_redis.h?rev=1767740&view=auto
==============================================================================
--- apr/apr-util/branches/1.6.x/include/apr_redis.h (added)
+++ apr/apr-util/branches/1.6.x/include/apr_redis.h Wed Nov  2 17:04:53 2016
@@ -0,0 +1,342 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/**
+ * @file apr_redis.h
+ * @brief Client interface for redis
+ * @remark To use this interface you must have a separate redis
+ * for more information.
+ */
+
+#ifndef APR_REDIS_H
+#define APR_REDIS_H
+
+#include "apr.h"
+#include "apr_pools.h"
+#include "apr_time.h"
+#include "apr_strings.h"
+#include "apr_network_io.h"
+#include "apr_ring.h"
+#include "apr_buckets.h"
+#include "apr_reslist.h"
+#include "apr_hash.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef RC_DEFAULT_SERVER_PORT
+#define RC_DEFAULT_SERVER_PORT 6379
+#endif
+
+#ifndef RC_DEFAULT_SERVER_MIN
+#define RC_DEFAULT_SERVER_MIN 0
+#endif
+
+#ifndef RC_DEFAULT_SERVER_SMAX
+#define RC_DEFAULT_SERVER_SMAX 1
+#endif
+
+#ifndef RC_DEFAULT_SERVER_TTL
+#define RC_DEFAULT_SERVER_TTL 600
+#endif
+
+/**
+ * @defgroup APR_Util_MC Redis Client Routines
+ * @ingroup APR_Util
+ * @{
+ */
+
+/** Specifies the status of a redis server */
+typedef enum
+{
+    APR_RC_SERVER_LIVE, /**< Server is alive and responding to requests */
+    APR_RC_SERVER_DEAD  /**< Server is not responding to requests */
+} apr_redis_server_status_t;
+
+/** Opaque redis client connection object */
+typedef struct apr_redis_conn_t apr_redis_conn_t;
+
+/** Redis Server Info Object */
+typedef struct apr_redis_server_t apr_redis_server_t;
+struct apr_redis_server_t
+{
+    const char *host; /**< Hostname of this Server */
+    apr_port_t port; /**< Port of this Server */
+    apr_redis_server_status_t status; /**< @see apr_redis_server_status_t */
+#if APR_HAS_THREADS || defined(DOXYGEN)
+    apr_reslist_t *conns; /**< Resource list of actual client connections */
+#else
+    apr_redis_conn_t *conn;
+#endif
+    apr_pool_t *p; /** Pool to use for private allocations */
+#if APR_HAS_THREADS
+    apr_thread_mutex_t *lock;
+#endif
+    apr_time_t btime;
+    apr_uint32_t rwto;
+};
+
+typedef struct apr_redis_t apr_redis_t;
+
+/* Custom hash callback function prototype, user for server selection.
+* @param baton user selected baton
+* @param data data to hash
+* @param data_len length of data
+*/
+typedef apr_uint32_t (*apr_redis_hash_func)(void *baton,
+                                               const char *data,
+                                               const apr_size_t data_len);
+/* Custom Server Select callback function prototype.
+* @param baton user selected baton
+* @param rc redis instance, use rc->live_servers to select a node
+* @param hash hash of the selected key.
+*/
+typedef apr_redis_server_t* (*apr_redis_server_func)(void *baton,
+                                                 apr_redis_t *rc,
+                                                 const apr_uint32_t hash);
+
+/** Container for a set of redis servers */
+struct apr_redis_t
+{
+    apr_uint32_t flags; /**< Flags, Not currently used */
+    apr_uint16_t nalloc; /**< Number of Servers Allocated */
+    apr_uint16_t ntotal; /**< Number of Servers Added */
+    apr_redis_server_t **live_servers; /**< Array of Servers */
+    apr_pool_t *p; /** Pool to use for allocations */
+    void *hash_baton;
+    apr_redis_hash_func hash_func;
+    void *server_baton;
+    apr_redis_server_func server_func;
+};
+
+/**
+ * Creates a crc32 hash used to split keys between servers
+ * @param rc The redis client object to use
+ * @param data Data to be hashed
+ * @param data_len Length of the data to use
+ * @return crc32 hash of data
+ * @remark The crc32 hash is not compatible with old redisd clients.
+ */
+APU_DECLARE(apr_uint32_t) apr_redis_hash(apr_redis_t *rc,
+                                            const char *data,
+                                            const apr_size_t data_len);
+
+/**
+ * Pure CRC32 Hash. Used by some clients.
+ */
+APU_DECLARE(apr_uint32_t) apr_redis_hash_crc32(void *baton,
+                                                  const char *data,
+                                                  const apr_size_t data_len);
+
+/**
+ * hash compatible with the standard Perl Client.
+ */
+APU_DECLARE(apr_uint32_t) apr_redis_hash_default(void *baton,
+                                                    const char *data,
+                                                    const apr_size_t data_len);
+
+/**
+ * Picks a server based on a hash
+ * @param rc The redis client object to use
+ * @param hash Hashed value of a Key
+ * @return server that controls specified hash
+ * @see apr_redis_hash
+ */
+APU_DECLARE(apr_redis_server_t *) apr_redis_find_server_hash(apr_redis_t *rc,
+                                                                   const apr_uint32_t hash);
+
+/**
+ * server selection compatible with the standard Perl Client.
+ */
+APU_DECLARE(apr_redis_server_t *) apr_redis_find_server_hash_default(void *baton,
+                                                                           apr_redis_t *rc,
+                                                                           const apr_uint32_t
hash);
+
+/**
+ * Adds a server to a client object
+ * @param rc The redis client object to use
+ * @param server Server to add
+ * @remark Adding servers is not thread safe, and should be done once at startup.
+ * @warning Changing servers after startup may cause keys to go to
+ * different servers.
+ */
+APU_DECLARE(apr_status_t) apr_redis_add_server(apr_redis_t *rc,
+                                                  apr_redis_server_t *server);
+
+
+/**
+ * Finds a Server object based on a hostname/port pair
+ * @param rc The redis client object to use
+ * @param host Hostname of the server
+ * @param port Port of the server
+ * @return Server with matching Hostname and Port, or NULL if none was found.
+ */
+APU_DECLARE(apr_redis_server_t *) apr_redis_find_server(apr_redis_t *rc,
+                                                              const char *host,
+                                                              apr_port_t port);
+
+/**
+ * Enables a Server for use again
+ * @param rc The redis client object to use
+ * @param rs Server to Activate
+ */
+APU_DECLARE(apr_status_t) apr_redis_enable_server(apr_redis_t *rc,
+                                                     apr_redis_server_t *rs);
+
+
+/**
+ * Disable a Server
+ * @param rc The redis client object to use
+ * @param rs Server to Disable
+ */
+APU_DECLARE(apr_status_t) apr_redis_disable_server(apr_redis_t *rc,
+                                                      apr_redis_server_t *rs);
+
+/**
+ * Creates a new Server Object
+ * @param p Pool to use
+ * @param host hostname of the server
+ * @param port port of the server
+ * @param min  minimum number of client sockets to open
+ * @param smax soft maximum number of client connections to open
+ * @param max  hard maximum number of client connections
+ * @param ttl  time to live in microseconds of a client connection
+ * @param rwto r/w timeout value in seconds of a client connection
+ * @param ns   location of the new server object
+ * @see apr_reslist_create
+ * @remark min, smax, and max are only used when APR_HAS_THREADS
+ */
+APU_DECLARE(apr_status_t) apr_redis_server_create(apr_pool_t *p,
+                                                     const char *host,
+                                                     apr_port_t port,
+                                                     apr_uint32_t min,
+                                                     apr_uint32_t smax,
+                                                     apr_uint32_t max,
+                                                     apr_uint32_t ttl,
+                                                     apr_uint32_t rwto,
+                                                     apr_redis_server_t **ns);
+/**
+ * Creates a new redisd client object
+ * @param p Pool to use
+ * @param max_servers maximum number of servers
+ * @param flags Not currently used
+ * @param rc   location of the new redis client object
+ */
+APU_DECLARE(apr_status_t) apr_redis_create(apr_pool_t *p,
+                                              apr_uint16_t max_servers,
+                                              apr_uint32_t flags,
+                                              apr_redis_t **rc);
+
+/**
+ * Gets a value from the server, allocating the value out of p
+ * @param rc client to use
+ * @param p Pool to use
+ * @param key null terminated string containing the key
+ * @param baton location of the allocated value
+ * @param len   length of data at baton
+ * @param flags any flags set by the client for this key
+ * @return 
+ */
+APU_DECLARE(apr_status_t) apr_redis_getp(apr_redis_t *rc,
+                                            apr_pool_t *p,
+                                            const char* key,
+                                            char **baton,
+                                            apr_size_t *len,
+                                            apr_uint16_t *flags);
+
+/**
+ * Sets a value by key on the server
+ * @param rc client to use
+ * @param key   null terminated string containing the key
+ * @param baton data to store on the server
+ * @param data_size   length of data at baton
+ * @param timeout time in seconds for the data to live on the server
+ * @param flags any flags set by the client for this key
+ */
+APU_DECLARE(apr_status_t) apr_redis_setex(apr_redis_t *rc,
+                                           const char *key,
+                                           char *baton,
+                                           const apr_size_t data_size,
+                                           apr_uint32_t timeout,
+                                           apr_uint16_t flags);
+
+/**
+ * Deletes a key from a server
+ * @param rc client to use
+ * @param key   null terminated string containing the key
+ * @param timeout time for the delete to stop other clients from adding
+ */
+APU_DECLARE(apr_status_t) apr_redis_delete(apr_redis_t *rc,
+                                              const char *key,
+                                              apr_uint32_t timeout);
+
+typedef struct
+{
+    /** Version string of this server */
+    const char *version;
+    /** Process id of this server process */
+    apr_uint32_t pid;
+    /** Number of seconds this server has been running */
+    apr_uint32_t uptime;
+    /** current UNIX time according to the server */
+    apr_time_t time;
+    /** The size of a pointer on the current machine */
+    apr_uint32_t pointer_size;
+    /** Accumulated user time for this process */
+    apr_time_t rusage_user;
+    /** Accumulated system time for this process */
+    apr_time_t rusage_system;
+    /** Current number of items stored by the server */
+    apr_uint32_t curr_items;
+    /** Total number of items stored by this server */
+    apr_uint32_t total_items;
+    /** Current number of bytes used by this server to store items */
+    apr_uint64_t bytes;
+    /** Number of open connections */
+    apr_uint32_t curr_connections;
+    /** Total number of connections opened since the server started running */
+    apr_uint32_t total_connections;
+    /** Number of connection structures allocated by the server */
+    apr_uint32_t connection_structures;
+    /** Cumulative number of retrieval requests */
+    apr_uint32_t cmd_get;
+    /** Cumulative number of storage requests */
+    apr_uint32_t cmd_set;
+    /** Number of keys that have been requested and found present */
+    apr_uint32_t get_hits;
+    /** Number of items that have been requested and not found */
+    apr_uint32_t get_misses;
+    /** Number of items removed from cache because they passed their
+        expiration time */
+    apr_uint64_t evictions;
+    /** Total number of bytes read by this server */
+    apr_uint64_t bytes_read;
+    /** Total number of bytes sent by this server */
+    apr_uint64_t bytes_written;
+    /** Number of bytes this server is allowed to use for storage. */
+    apr_uint32_t limit_maxbytes;
+    /** Number of threads the server is running (if built with threading) */
+    apr_uint32_t threads; 
+} apr_redis_stats_t;
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* APR_REDIS_H */

Added: apr/apr-util/branches/1.6.x/redis/apr_redis.c
URL: http://svn.apache.org/viewvc/apr/apr-util/branches/1.6.x/redis/apr_redis.c?rev=1767740&view=auto
==============================================================================
--- apr/apr-util/branches/1.6.x/redis/apr_redis.c (added)
+++ apr/apr-util/branches/1.6.x/redis/apr_redis.c Wed Nov  2 17:04:53 2016
@@ -0,0 +1,1008 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#include "apr_redis.h"
+#include "apr_poll.h"
+#include "apr_version.h"
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER_SIZE 512
+#define INT_64_LEN 22
+struct apr_redis_conn_t
+{
+    char *buffer;
+    apr_size_t blen;
+    apr_pool_t *p;
+    apr_pool_t *tp;
+    apr_socket_t *sock;
+    apr_bucket_brigade *bb;
+    apr_bucket_brigade *tb;
+    apr_redis_server_t *rs;
+};
+
+/* Strings for Client Commands */
+
+#define RC_EOL "\r\n"
+#define RC_EOL_LEN (sizeof(RC_EOL)-1)
+
+#define RC_WS " "
+#define RC_WS_LEN (sizeof(RC_WS)-1)
+
+#define RC_RESP_1 "*1\r\n"
+#define RC_RESP_1_LEN (sizeof(RC_RESP_1)-1)
+
+#define RC_RESP_2 "*2\r\n"
+#define RC_RESP_2_LEN (sizeof(RC_RESP_2)-1)
+
+#define RC_RESP_4 "*4\r\n"
+#define RC_RESP_4_LEN (sizeof(RC_RESP_4)-1)
+
+#define RC_GET "GET\r\n"
+#define RC_GET_LEN (sizeof(RC_GET)-1)
+
+#define RC_GET_SIZE "$3\r\n"
+#define RC_GET_SIZE_LEN (sizeof(RC_GET_SIZE)-1)
+
+#define RC_SETEX "SETEX\r\n"
+#define RC_SETEX_LEN (sizeof(RC_SETEX)-1)
+
+#define RC_SETEX_SIZE "$5\r\n"
+#define RC_SETEX_SIZE_LEN (sizeof(RC_SETEX_SIZE)-1)
+
+#define RC_DEL "DEL\r\n"
+#define RC_DEL_LEN (sizeof(RC_DEL)-1)
+
+#define RC_DEL_SIZE "$3\r\n"
+#define RC_DEL_SIZE_LEN (sizeof(RC_DEL_SIZE)-1)
+
+#define RC_QUIT "QUIT\r\n"
+#define RC_QUIT_LEN (sizeof(RC_QUIT)-1)
+
+#define RC_QUIT_SIZE "$4\r\n"
+#define RC_QUIT_SIZE_LEN (sizeof(RC_QUIT_SIZE)-1)
+
+#define RC_PING "PING\r\n"
+#define RC_PING_LEN (sizeof(RC_PING)-1)
+
+#define RC_PING_SIZE "$4\r\n"
+#define RC_PING_SIZE_LEN (sizeof(RC_PING_SIZE)-1)
+
+/* Strings for Server Replies */
+
+#define RS_STORED "+OK"
+#define RS_STORED_LEN (sizeof(RS_STORED)-1)
+
+#define RS_NOT_STORED "$-1"
+#define RS_NOT_STORED_LEN (sizeof(RS_NOT_STORED)-1)
+
+#define RS_DELETED ":1"
+#define RS_DELETED_LEN (sizeof(RS_DELETED)-1)
+
+#define RS_NOT_FOUND_GET "$-1"
+#define RS_NOT_FOUND_GET_LEN (sizeof(RS_NOT_FOUND_GET)-1)
+
+#define RS_NOT_FOUND_DEL ":0"
+#define RS_NOT_FOUND_DEL_LEN (sizeof(RS_NOT_FOUND_DEL)-1)
+
+#define RS_TYPE_STRING "$"
+#define RS_TYPE_STRING_LEN (sizeof(RS_TYPE_STRING)-1)
+
+#define RS_END "\r\n"
+#define RS_END_LEN (sizeof(RS_END)-1)
+
+static apr_status_t make_server_dead(apr_redis_t *rc,
+                                     apr_redis_server_t *rs)
+{
+#if APR_HAS_THREADS
+    apr_thread_mutex_lock(rs->lock);
+#endif
+    rs->status = APR_RC_SERVER_DEAD;
+    rs->btime = apr_time_now();
+#if APR_HAS_THREADS
+    apr_thread_mutex_unlock(rs->lock);
+#endif
+    return APR_SUCCESS;
+}
+
+static apr_status_t make_server_live(apr_redis_t *rc,
+                                     apr_redis_server_t *rs)
+{
+    rs->status = APR_RC_SERVER_LIVE;
+    return APR_SUCCESS;
+}
+
+APU_DECLARE(apr_status_t) apr_redis_add_server(apr_redis_t *rc,
+                                               apr_redis_server_t *rs)
+{
+    apr_status_t rv = APR_SUCCESS;
+
+    if (rc->ntotal >= rc->nalloc) {
+        return APR_ENOMEM;
+    }
+    rc->live_servers[rc->ntotal] = rs;
+    rc->ntotal++;
+    make_server_live(rc, rs);
+    return rv;
+}
+
+static apr_status_t rc_ping(apr_redis_server_t *rs);
+
+APU_DECLARE(apr_redis_server_t *)
+    apr_redis_find_server_hash_default(void *baton, apr_redis_t *rc,
+                                   const apr_uint32_t hash)
+{
+    apr_redis_server_t *rs = NULL;
+    apr_uint32_t h = hash ? hash : 1;
+    apr_uint32_t i = 0;
+    apr_time_t curtime = 0;
+
+    if (rc->ntotal == 0) {
+        return NULL;
+    }
+
+    do {
+        rs = rc->live_servers[h % rc->ntotal];
+        if (rs->status == APR_RC_SERVER_LIVE) {
+            break;
+        }
+        else {
+            if (curtime == 0) {
+                curtime = apr_time_now();
+            }
+#if APR_HAS_THREADS
+            apr_thread_mutex_lock(rs->lock);
+#endif
+            /* Try the dead server, every 5 seconds */
+            if (curtime - rs->btime > apr_time_from_sec(5)) {
+                rs->btime = curtime;
+                if (rc_ping(rs) == APR_SUCCESS) {
+                    make_server_live(rc, rs);
+#if APR_HAS_THREADS
+                    apr_thread_mutex_unlock(rs->lock);
+#endif
+                    break;
+                }
+            }
+#if APR_HAS_THREADS
+            apr_thread_mutex_unlock(rs->lock);
+#endif
+        }
+        h++;
+        i++;
+    } while (i < rc->ntotal);
+
+    if (i == rc->ntotal) {
+        rs = NULL;
+    }
+
+    return rs;
+}
+
+APU_DECLARE(apr_redis_server_t *)
+    apr_redis_find_server_hash(apr_redis_t *rc, const apr_uint32_t hash)
+{
+    if (rc->server_func) {
+        return rc->server_func(rc->server_baton, rc, hash);
+    }
+    else {
+        return apr_redis_find_server_hash_default(NULL, rc, hash);
+    }
+}
+
+APU_DECLARE(apr_redis_server_t *) apr_redis_find_server(apr_redis_t *rc,
+                                                        const char *host,
+                                                        apr_port_t port)
+{
+    int i;
+
+    for (i = 0; i < rc->ntotal; i++) {
+        if (strcmp(rc->live_servers[i]->host, host) == 0
+            && rc->live_servers[i]->port == port) {
+
+            return rc->live_servers[i];
+        }
+    }
+
+    return NULL;
+}
+
+static apr_status_t rs_find_conn(apr_redis_server_t *rs,
+                                 apr_redis_conn_t ** conn)
+{
+    apr_status_t rv;
+    apr_bucket_alloc_t *balloc;
+    apr_bucket *e;
+
+#if APR_HAS_THREADS
+    rv = apr_reslist_acquire(rs->conns, (void **) conn);
+#else
+    *conn = rs->conn;
+    rv = APR_SUCCESS;
+#endif
+
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    balloc = apr_bucket_alloc_create((*conn)->tp);
+    (*conn)->bb = apr_brigade_create((*conn)->tp, balloc);
+    (*conn)->tb = apr_brigade_create((*conn)->tp, balloc);
+
+    e = apr_bucket_socket_create((*conn)->sock, balloc);
+    APR_BRIGADE_INSERT_TAIL((*conn)->bb, e);
+
+    return rv;
+}
+
+static apr_status_t rs_bad_conn(apr_redis_server_t *rs,
+                                apr_redis_conn_t *conn)
+{
+#if APR_HAS_THREADS
+    return apr_reslist_invalidate(rs->conns, conn);
+#else
+    return APR_SUCCESS;
+#endif
+}
+
+static apr_status_t rs_release_conn(apr_redis_server_t *rs,
+                                    apr_redis_conn_t *conn)
+{
+    apr_pool_clear(conn->tp);
+#if APR_HAS_THREADS
+    return apr_reslist_release(rs->conns, conn);
+#else
+    return APR_SUCCESS;
+#endif
+}
+
+APU_DECLARE(apr_status_t) apr_redis_enable_server(apr_redis_t *rc,
+                                                  apr_redis_server_t *rs)
+{
+    apr_status_t rv = APR_SUCCESS;
+
+    if (rs->status == APR_RC_SERVER_LIVE) {
+        return rv;
+    }
+    rv = make_server_live(rc, rs);
+    return rv;
+}
+
+APU_DECLARE(apr_status_t) apr_redis_disable_server(apr_redis_t *rc,
+                                                   apr_redis_server_t *rs)
+{
+    return make_server_dead(rc, rs);
+}
+
+static apr_status_t conn_connect(apr_redis_conn_t *conn)
+{
+    apr_status_t rv = APR_SUCCESS;
+    apr_sockaddr_t *sa;
+#if APR_HAVE_SOCKADDR_UN
+    apr_int32_t family = conn->rs->host[0] != '/' ? APR_INET : APR_UNIX;
+#else
+    apr_int32_t family = APR_INET;
+#endif
+
+    rv = apr_sockaddr_info_get(&sa, conn->rs->host, family, conn->rs->port,
0,
+                               conn->p);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_socket_timeout_set(conn->sock, 1 * APR_USEC_PER_SEC);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_socket_connect(conn->sock, sa);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_socket_timeout_set(conn->sock,
+                                conn->rs->rwto * APR_USEC_PER_SEC);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    return rv;
+}
+
+static apr_status_t
+rc_conn_construct(void **conn_, void *params, apr_pool_t *pool)
+{
+    apr_status_t rv = APR_SUCCESS;
+    apr_redis_conn_t *conn;
+    apr_pool_t *np;
+    apr_pool_t *tp;
+    apr_redis_server_t *rs = params;
+#if APR_HAVE_SOCKADDR_UN
+    apr_int32_t family = rs->host[0] != '/' ? APR_INET : APR_UNIX;
+#else
+    apr_int32_t family = APR_INET;
+#endif
+
+    rv = apr_pool_create(&np, pool);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_pool_create(&tp, np);
+    if (rv != APR_SUCCESS) {
+        apr_pool_destroy(np);
+        return rv;
+    }
+
+    conn = apr_palloc(np, sizeof(apr_redis_conn_t));
+
+    conn->p = np;
+    conn->tp = tp;
+
+    rv = apr_socket_create(&conn->sock, family, SOCK_STREAM, 0, np);
+
+    if (rv != APR_SUCCESS) {
+        apr_pool_destroy(np);
+        return rv;
+    }
+
+    conn->buffer = apr_palloc(conn->p, BUFFER_SIZE);
+    conn->blen = 0;
+    conn->rs = rs;
+
+    rv = conn_connect(conn);
+    if (rv != APR_SUCCESS) {
+        apr_pool_destroy(np);
+    }
+    else {
+        *conn_ = conn;
+    }
+
+    return rv;
+}
+
+#if APR_HAS_THREADS
+static apr_status_t
+rc_conn_destruct(void *conn_, void *params, apr_pool_t *pool)
+{
+    apr_redis_conn_t *conn = (apr_redis_conn_t *) conn_;
+    struct iovec vec[3];
+    apr_size_t written;
+
+    /* send a quit message to the Redis server to be nice about it. */
+
+    /*
+     * RESP Command:
+     *   *1
+     *   $4
+     *   QUIT
+     */
+    vec[0].iov_base = RC_RESP_1;
+    vec[0].iov_len = RC_RESP_1_LEN;
+
+    vec[1].iov_base = RC_QUIT_SIZE;
+    vec[1].iov_len = RC_QUIT_SIZE_LEN;
+
+    vec[2].iov_base = RC_QUIT;
+    vec[2].iov_len = RC_QUIT_LEN;
+
+    /* Return values not checked, since we just want to make it go away. */
+    apr_socket_sendv(conn->sock, vec, 3, &written);
+    apr_socket_close(conn->sock);
+
+    apr_pool_destroy(conn->p);
+
+    return APR_SUCCESS;
+}
+#endif
+
+APU_DECLARE(apr_status_t) apr_redis_server_create(apr_pool_t *p,
+                                                  const char *host,
+                                                  apr_port_t port,
+                                                  apr_uint32_t min,
+                                                  apr_uint32_t smax,
+                                                  apr_uint32_t max,
+                                                  apr_uint32_t ttl,
+                                                  apr_uint32_t rwto,
+                                                  apr_redis_server_t **rs)
+{
+    apr_status_t rv = APR_SUCCESS;
+    apr_redis_server_t *server;
+    apr_pool_t *np;
+
+    rv = apr_pool_create(&np, p);
+
+    server = apr_palloc(np, sizeof(apr_redis_server_t));
+
+    server->p = np;
+    server->host = apr_pstrdup(np, host);
+    server->port = port;
+    server->status = APR_RC_SERVER_DEAD;
+    server->rwto = rwto;
+
+#if APR_HAS_THREADS
+    rv = apr_thread_mutex_create(&server->lock, APR_THREAD_MUTEX_DEFAULT, np);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_reslist_create(&server->conns, min,        /* hard minimum */
+                            smax,       /* soft maximum */
+                            max,        /* hard maximum */
+                            ttl,        /* Time to live */
+                            rc_conn_construct,  /* Make a New Connection */
+                            rc_conn_destruct,   /* Kill Old Connection */
+                            server, np);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    apr_reslist_cleanup_order_set(server->conns, APR_RESLIST_CLEANUP_FIRST);
+#else
+    rv = rc_conn_construct((void **) &(server->conn), server, np);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+#endif
+
+    *rs = server;
+
+    return rv;
+}
+
+APU_DECLARE(apr_status_t) apr_redis_create(apr_pool_t *p,
+                                           apr_uint16_t max_servers,
+                                           apr_uint32_t flags,
+                                           apr_redis_t **redis)
+{
+    apr_status_t rv = APR_SUCCESS;
+    apr_redis_t *rc;
+
+    rc = apr_palloc(p, sizeof(apr_redis_t));
+    rc->p = p;
+    rc->nalloc = max_servers;
+    rc->ntotal = 0;
+    rc->live_servers =
+        apr_palloc(p, rc->nalloc * sizeof(struct apr_redis_server_t *));
+    rc->hash_func = NULL;
+    rc->hash_baton = NULL;
+    rc->server_func = NULL;
+    rc->server_baton = NULL;
+    *redis = rc;
+    return rv;
+}
+
+
+/* The crc32 functions and data was originally written by Spencer
+ * Garrett <srg@quick.com> and was gleaned from the PostgreSQL source
+ * tree via the files contrib/ltree/crc32.[ch] and from FreeBSD at
+ * src/usr.bin/cksum/crc32.c.
+ */
+
+static const apr_uint32_t crc32tab[256] = {
+    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
+    0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+    0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+    0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+    0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
+    0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+    0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
+    0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
+    0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+    0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+    0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
+    0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
+    0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+    0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
+    0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+    0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+    0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+    0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
+    0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
+    0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+    0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+    0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+    0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
+    0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+    0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
+    0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
+    0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+    0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+    0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
+    0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
+    0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+    0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
+    0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+    0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+    0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+    0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
+    0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
+    0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+    0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+};
+
+APU_DECLARE(apr_uint32_t) apr_redis_hash_crc32(void *baton,
+                                               const char *data,
+                                               const apr_size_t data_len)
+{
+    apr_uint32_t i;
+    apr_uint32_t crc;
+    crc = ~0;
+
+    for (i = 0; i < data_len; i++)
+        crc = (crc >> 8) ^ crc32tab[(crc ^ (data[i])) & 0xff];
+
+    return ~crc;
+}
+
+APU_DECLARE(apr_uint32_t) apr_redis_hash_default(void *baton,
+                                                 const char *data,
+                                                 const apr_size_t data_len)
+{
+    /* The default Perl Client doesn't actually use just crc32 -- it shifts it again
+     * like this....
+     */
+    return ((apr_redis_hash_crc32(baton, data, data_len) >> 16) & 0x7fff);
+}
+
+APU_DECLARE(apr_uint32_t) apr_redis_hash(apr_redis_t *rc,
+                                         const char *data,
+                                         const apr_size_t data_len)
+{
+    if (rc->hash_func) {
+        return rc->hash_func(rc->hash_baton, data, data_len);
+    }
+    else {
+        return apr_redis_hash_default(NULL, data, data_len);
+    }
+}
+
+static apr_status_t get_server_line(apr_redis_conn_t *conn)
+{
+    apr_size_t bsize = BUFFER_SIZE;
+    apr_status_t rv = APR_SUCCESS;
+
+    rv = apr_brigade_split_line(conn->tb, conn->bb, APR_BLOCK_READ,
+                                BUFFER_SIZE);
+
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_brigade_flatten(conn->tb, conn->buffer, &bsize);
+
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    conn->blen = bsize;
+    conn->buffer[bsize] = '\0';
+
+    return apr_brigade_cleanup(conn->tb);
+}
+
+APU_DECLARE(apr_status_t) apr_redis_setex(apr_redis_t *rc,
+                                          const char *key,
+                                          char *data,
+                                          const apr_size_t data_size,
+                                          apr_uint32_t timeout,
+                                          apr_uint16_t flags)
+{
+    apr_uint32_t hash;
+    apr_redis_server_t *rs;
+    apr_redis_conn_t *conn;
+    apr_status_t rv;
+    apr_size_t written;
+    struct iovec vec[11];
+    int index = 0;
+    char keysize_str[INT_64_LEN];
+    char expire_str[INT_64_LEN];
+    char expiresize_str[INT_64_LEN];
+    char datasize_str[BUFFER_SIZE];
+    apr_size_t len, klen, expire_len;
+
+
+    if (data_size >= BUFFER_SIZE) {
+        return APR_NOTFOUND;
+    }
+
+
+    hash = apr_redis_hash(rc, key, klen);
+
+    rs = apr_redis_find_server_hash(rc, hash);
+
+    if (rs == NULL)
+        return APR_NOTFOUND;
+
+    rv = rs_find_conn(rs, &conn);
+
+    if (rv != APR_SUCCESS) {
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    klen = strlen(key);
+    /*
+     * RESP Command:
+     *   *1
+     *   $5
+     *   SETEX
+     *   $<keylen>
+     *   key
+     *   $<expirelen>
+     *   expirey
+     *   $<datalen>
+     *   data
+     */
+
+    vec[0].iov_base = RC_RESP_4;
+    vec[0].iov_len = RC_RESP_4_LEN;
+
+    vec[1].iov_base = RC_SETEX_SIZE;
+    vec[1].iov_len = RC_SETEX_SIZE_LEN;
+
+    vec[2].iov_base = RC_SETEX;
+    vec[2].iov_len = RC_SETEX_LEN;
+
+    len = apr_snprintf(keysize_str, INT_64_LEN, "$%" APR_SIZE_T_FMT "", klen);
+    vec[3].iov_base = keysize_str;
+    vec[3].iov_len = len;
+
+    vec[4].iov_base = (void *) key;
+    vec[4].iov_len = klen;
+
+    vec[5].iov_base = RC_EOL;
+    vec[5].iov_len = RC_EOL_LEN;
+
+    expire_len = apr_snprintf(expire_str, INT_64_LEN, "%u\r\n", timeout);
+    len =
+        apr_snprintf(expiresize_str, INT_64_LEN, "$%" APR_SIZE_T_FMT "\r\n",
+                     expire_len - 2);
+    vec[6].iov_base = (void *) expiresize_str;
+    vec[6].iov_len = len;
+
+    vec[7].iov_base = (void *) expire_str;
+    vec[7].iov_len = expire_len;
+
+    len =
+        apr_snprintf(datasize_str, INT_64_LEN, "$%" APR_SIZE_T_FMT "",
+                     data_size);
+    vec[8].iov_base = datasize_str;
+    vec[8].iov_len = len;
+
+    vec[9].iov_base = data;
+    vec[9].iov_len = data_size;
+
+    vec[10].iov_base = RC_EOL;
+    vec[10].iov_len = RC_EOL_LEN;
+
+    rv = apr_socket_sendv(conn->sock, vec, 11, &written);
+
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    rv = get_server_line(conn);
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    if (strcmp(conn->buffer, RS_STORED RC_EOL) == 0) {
+        rv = APR_SUCCESS;
+    }
+    else if (strcmp(conn->buffer, RS_NOT_STORED RC_EOL) == 0) {
+        rv = APR_EEXIST;
+    }
+    else {
+        rv = APR_EGENERAL;
+    }
+
+    rs_release_conn(rs, conn);
+    return rv;
+}
+
+
+APU_DECLARE(apr_status_t) apr_redis_getp(apr_redis_t *rc,
+                                         apr_pool_t *p,
+                                         const char *key,
+                                         char **baton,
+                                         apr_size_t *new_length,
+                                         apr_uint16_t *flags_)
+{
+    apr_status_t rv;
+    apr_redis_server_t *rs;
+    apr_redis_conn_t *conn;
+    apr_uint32_t hash;
+    apr_size_t written;
+    apr_size_t len, klen;
+    struct iovec vec[6];
+    char keysize_str[INT_64_LEN];
+
+    hash = apr_redis_hash(rc, key, klen);
+    rs = apr_redis_find_server_hash(rc, hash);
+    if (rs == NULL)
+        return APR_NOTFOUND;
+
+    rv = rs_find_conn(rs, &conn);
+
+    if (rv != APR_SUCCESS) {
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    klen = strlen(key);
+    /*
+     * RESP Command:
+     *   *2
+     *   $3
+     *   GET
+     *   $<keylen>
+     *   key
+     */
+    vec[0].iov_base = RC_RESP_2;
+    vec[0].iov_len = RC_RESP_2_LEN;
+
+    vec[1].iov_base = RC_GET_SIZE;
+    vec[2].iov_len = RC_GET_SIZE_LEN;
+
+    vec[2].iov_base = RC_GET;
+    vec[2].iov_len = RC_GET_LEN;
+
+    len =
+        apr_snprintf(keysize_str, INT_64_LEN, "$%" APR_SIZE_T_FMT "\r\n",
+                     klen);
+    vec[3].iov_base = keysize_str;
+    vec[3].iov_len = len;
+
+    vec[4].iov_base = (void *) key;
+    vec[4].iov_len = klen;
+
+    vec[5].iov_base = RC_EOL;
+    vec[5].iov_len = RC_EOL_LEN;
+
+    rv = apr_socket_sendv(conn->sock, vec, 6, &written);
+
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    rv = get_server_line(conn);
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+    if (strncmp(RS_NOT_FOUND_GET, conn->buffer, RS_NOT_FOUND_GET_LEN) == 0) {
+        rv = APR_NOTFOUND;
+    }
+    else if (strncmp(RS_TYPE_STRING, conn->buffer, RS_TYPE_STRING_LEN) == 0) {
+        char *length;
+        char *last;
+        apr_size_t len = 0;
+        *new_length = 0;
+
+        length = apr_strtok(conn->buffer + 1, " ", &last);
+        if (length) {
+            len = strtol(length, (char **) NULL, 10);
+        }
+
+        if (len == 0) {
+            *new_length = 0;
+            *baton = NULL;
+        }
+        else {
+            apr_bucket_brigade *bbb;
+            apr_bucket *e;
+
+            /* eat the trailing \r\n */
+            rv = apr_brigade_partition(conn->bb, len + 2, &e);
+
+            if (rv != APR_SUCCESS) {
+                rs_bad_conn(rs, conn);
+                apr_redis_disable_server(rc, rs);
+                return rv;
+            }
+
+            bbb = apr_brigade_split(conn->bb, e);
+
+            rv = apr_brigade_pflatten(conn->bb, baton, &len, p);
+
+            if (rv != APR_SUCCESS) {
+                rs_bad_conn(rs, conn);
+                apr_redis_disable_server(rc, rs);
+                return rv;
+            }
+
+            rv = apr_brigade_destroy(conn->bb);
+            if (rv != APR_SUCCESS) {
+                rs_bad_conn(rs, conn);
+                apr_redis_disable_server(rc, rs);
+                return rv;
+            }
+
+            conn->bb = bbb;
+
+            *new_length = len - 2;
+            (*baton)[*new_length] = '\0';
+        }
+    }
+    else {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return (APR_EGENERAL);
+    }
+
+    rs_release_conn(rs, conn);
+    return rv;
+}
+
+APU_DECLARE(apr_status_t)
+    apr_redis_delete(apr_redis_t *rc, const char *key, apr_uint32_t timeout)
+{
+    apr_status_t rv;
+    apr_redis_server_t *rs;
+    apr_redis_conn_t *conn;
+    apr_uint32_t hash;
+    apr_size_t written;
+    struct iovec vec[6];
+    apr_size_t len, klen;
+    char keysize_str[INT_64_LEN];
+
+    hash = apr_redis_hash(rc, key, klen);
+    rs = apr_redis_find_server_hash(rc, hash);
+    if (rs == NULL)
+        return APR_NOTFOUND;
+
+    rv = rs_find_conn(rs, &conn);
+
+    if (rv != APR_SUCCESS) {
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    klen = strlen(key);
+    /*
+     * RESP Command:
+     *   *2
+     *   $3
+     *   DEL
+     *   $<keylen>
+     *   key
+     */
+    vec[0].iov_base = RC_RESP_2;
+    vec[0].iov_len = RC_RESP_2_LEN;
+
+    vec[1].iov_base = RC_DEL_SIZE;
+    vec[2].iov_len = RC_DEL_SIZE_LEN;
+
+    vec[2].iov_base = RC_DEL;
+    vec[2].iov_len = RC_DEL_LEN;
+
+    len =
+        apr_snprintf(keysize_str, INT_64_LEN, "$%" APR_SIZE_T_FMT "\r\n",
+                     klen);
+    vec[3].iov_base = keysize_str;
+    vec[3].iov_len = len;
+
+    vec[4].iov_base = (void *) key;
+    vec[4].iov_len = klen;
+
+    vec[5].iov_base = RC_EOL;
+    vec[5].iov_len = RC_EOL_LEN;
+
+    rv = apr_socket_sendv(conn->sock, vec, 6, &written);
+
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    rv = get_server_line(conn);
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        apr_redis_disable_server(rc, rs);
+        return rv;
+    }
+
+    if (strncmp(RS_DELETED, conn->buffer, RS_DELETED_LEN) == 0) {
+        rv = APR_SUCCESS;
+    }
+    else if (strncmp(RS_NOT_FOUND_DEL, conn->buffer, RS_NOT_FOUND_DEL_LEN) ==
+             0) {
+        rv = APR_NOTFOUND;
+    }
+    else {
+        rv = APR_EGENERAL;
+    }
+
+    rs_release_conn(rs, conn);
+
+    return rv;
+}
+
+apr_status_t rc_ping(apr_redis_server_t *rs)
+{
+    apr_status_t rv;
+    apr_size_t written;
+    const int VEC_SIZE = 3;
+    struct iovec vec[3];
+    apr_redis_conn_t *conn;
+    int index = 0;
+
+    rv = rs_find_conn(rs, &conn);
+
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    /*
+     * RESP Command:
+     *   *1
+     *   $4
+     *   PING
+     */
+    vec[0].iov_base = RC_RESP_1;
+    vec[0].iov_len = RC_RESP_1_LEN;
+
+    vec[1].iov_base = RC_PING_SIZE;
+    vec[1].iov_len = RC_PING_SIZE_LEN;
+
+    vec[2].iov_base = RC_PING;
+    vec[2].iov_len = RC_PING_LEN;
+
+    rv = apr_socket_sendv(conn->sock, vec, 3, &written);
+
+    if (rv != APR_SUCCESS) {
+        rs_bad_conn(rs, conn);
+        return rv;
+    }
+
+    rv = get_server_line(conn);
+    rs_release_conn(rs, conn);
+    return rv;
+}




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