apr_memcache.c

        return rv;
    }

    if (strncmp(MS_ERROR, conn->buffer, MS_ERROR_LEN) == 0) {
        rv = APR_EGENERAL;
    }
    else if (strncmp(MS_NOT_FOUND, conn->buffer, MS_NOT_FOUND_LEN) == 0) {
        rv = APR_NOTFOUND;
    }
    else {
        if (new_value) {
            *new_value = atoi(conn->buffer);
        }
        rv = APR_SUCCESS;
    }

    ms_release_conn(ms, conn);

    return rv;
}

APU_DECLARE(apr_status_t)
apr_memcache_incr(apr_memcache_t *mc,
                    const char *key,
                    apr_int32_t inc,
                    apr_uint32_t *new_value)
{
    return num_cmd_write(mc,
                         MC_INCR,
                         MC_INCR_LEN,
                         key,
                         inc, 
                         new_value);
}


APU_DECLARE(apr_status_t)
apr_memcache_decr(apr_memcache_t *mc,
                    const char *key,
                    apr_int32_t inc,
                    apr_uint32_t *new_value)
{
    return num_cmd_write(mc,
                         MC_DECR,
                         MC_DECR_LEN,
                         key,
                         inc, 
                         new_value);
}



APU_DECLARE(apr_status_t)
apr_memcache_version(apr_memcache_server_t *ms,
                  apr_pool_t *p,
                  char **baton)
{
    apr_status_t rv;
    apr_memcache_conn_t *conn;
    apr_size_t written;
    struct iovec vec[2];

    rv = ms_find_conn(ms, &conn);

    if (rv != APR_SUCCESS) {
        return rv;
    }

    /* version\r\n */
    vec[0].iov_base = MC_VERSION;
    vec[0].iov_len  = MC_VERSION_LEN;

    vec[1].iov_base = MC_EOL;
    vec[1].iov_len  = MC_EOL_LEN;

    rv = apr_socket_sendv(conn->sock, vec, 2, &written);

    if (rv != APR_SUCCESS) {
        ms_bad_conn(ms, conn);
        return rv;
    }

    rv = get_server_line(conn);
    if (rv != APR_SUCCESS) {
        ms_bad_conn(ms, conn);
        return rv;
    }

    if (strncmp(MS_VERSION, conn->buffer, MS_VERSION_LEN) == 0) {
        *baton = apr_pstrmemdup(p, conn->buffer+MS_VERSION_LEN+1, 
                                conn->blen - MS_VERSION_LEN - 2);
        rv = APR_SUCCESS;
    }
    else {
        rv = APR_EGENERAL;
    }

    ms_release_conn(ms, conn);

    return rv;
}

apr_status_t mc_version_ping(apr_memcache_server_t *ms)
{
    apr_status_t rv;
    apr_size_t written;
    struct iovec vec[2];
    apr_memcache_conn_t *conn;

    rv = ms_find_conn(ms, &conn);

    if (rv != APR_SUCCESS) {
        return rv;
    }

    /* version\r\n */
    vec[0].iov_base = MC_VERSION;
    vec[0].iov_len  = MC_VERSION_LEN;

    vec[1].iov_base = MC_EOL;
    vec[1].iov_len  = MC_EOL_LEN;

    rv = apr_socket_sendv(conn->sock, vec, 2, &written);

    if (rv != APR_SUCCESS) {
        ms_bad_conn(ms, conn);
        return rv;
    }

    rv = get_server_line(conn);
    ms_release_conn(ms, conn);
    return rv;
}


APU_DECLARE(void) 
apr_memcache_add_multget_key(apr_pool_t *data_pool,
                             const char* key,
                             apr_hash_t **values)
{
    apr_memcache_value_t* value;
    apr_size_t klen = strlen(key);

    /* create the value hash if need be */
    if (!*values) {
        *values = apr_hash_make(data_pool);
    }

    /* init key and add it to the value hash */
    value = apr_pcalloc(data_pool, sizeof(apr_memcache_value_t));

    value->status = APR_NOTFOUND;
    value->key = apr_pstrdup(data_pool, key);

    apr_hash_set(*values, value->key, klen, value);
}

static void mget_conn_result(int serverup,
                             int connup,
                             apr_status_t rv,
                             apr_memcache_t *mc,
                             apr_memcache_server_t *ms,
                             apr_memcache_conn_t *conn,
                             struct cache_server_query_t *server_query,
                             apr_hash_t *values,
                             apr_hash_t *server_queries)
{
    apr_int32_t j;
    apr_memcache_value_t* value;
    
    apr_hash_set(server_queries, &ms, sizeof(ms), NULL);

    if (connup) {
        ms_release_conn(ms, conn);
    } else {
        ms_bad_conn(ms, conn);

        if (!serverup) {
            apr_memcache_disable_server(mc, ms);
        }
    }
    
    for (j = 1; j < server_query->query_vec_count ; j+=2) {
        if (server_query->query_vec[j].iov_base) {
            value = apr_hash_get(values, server_query->query_vec[j].iov_base,
                                 strlen(server_query->query_vec[j].iov_base));
            
            if (value->status == APR_NOTFOUND) {
                value->status = rv;
            }
        }
    }
}

APU_DECLARE(apr_status_t)
apr_memcache_multgetp(apr_memcache_t *mc,
                      apr_pool_t *temp_pool,
                      apr_pool_t *data_pool,
                      apr_hash_t *values)
{
    apr_status_t rv;
    apr_memcache_server_t* ms;
    apr_memcache_conn_t* conn;
    apr_uint32_t hash;
    apr_size_t written;
    apr_size_t klen;

    apr_memcache_value_t* value;
    apr_hash_index_t* value_hash_index;

    /* this is a little over aggresive, but beats multiple loops
     * to figure out how long each vector needs to be per-server.
     */
    apr_int32_t veclen = 2 + 2 * apr_hash_count(values) - 1; /* get <key>[<space><key>...]\r\n */
    apr_int32_t i, j;
    apr_int32_t queries_sent;
    apr_int32_t queries_recvd;

    apr_hash_t * server_queries = apr_hash_make(temp_pool);
    struct cache_server_query_t* server_query;
    apr_hash_index_t * query_hash_index;

    apr_pollset_t* pollset;
    const apr_pollfd_t* activefds;
    apr_pollfd_t* pollfds;


    /* build all the queries */
    value_hash_index = apr_hash_first(temp_pool, values);
    while (value_hash_index) {
        void *v;
        apr_hash_this(value_hash_index, NULL, NULL, &v);
        value = v;
        value_hash_index = apr_hash_next(value_hash_index);
        klen = strlen(value->key);

        hash = apr_memcache_hash(mc, value->key, klen);
        ms = apr_memcache_find_server_hash(mc, hash);
        if (ms == NULL) {
            continue;
        }

        server_query = apr_hash_get(server_queries, &ms, sizeof(ms));

        if (!server_query) {
            rv = ms_find_conn(ms, &conn);

            if (rv != APR_SUCCESS) {
                apr_memcache_disable_server(mc, ms);
                value->status = rv;
                continue;
            }

            server_query = apr_pcalloc(temp_pool,sizeof(struct cache_server_query_t));

            apr_hash_set(server_queries, &ms, sizeof(ms), server_query);

            server_query->ms = ms;
            server_query->conn = conn;
            server_query->query_vec = apr_pcalloc(temp_pool, sizeof(struct iovec)*veclen);

            /* set up the first key */
            server_query->query_vec[0].iov_base = MC_GET;
            server_query->query_vec[0].iov_len  = MC_GET_LEN;

            server_query->query_vec[1].iov_base = (void*)(value->key);
            server_query->query_vec[1].iov_len  = klen;

            server_query->query_vec[2].iov_base = MC_EOL;
            server_query->query_vec[2].iov_len  = MC_EOL_LEN;

            server_query->query_vec_count = 3;
        }
        else {
            j = server_query->query_vec_count - 1;

            server_query->query_vec[j].iov_base = MC_WS;
            server_query->query_vec[j].iov_len  = MC_WS_LEN;
            j++;

            server_query->query_vec[j].iov_base = (void*)(value->key);
            server_query->query_vec[j].iov_len  = klen;
            j++;

            server_query->query_vec[j].iov_base = MC_EOL;
            server_query->query_vec[j].iov_len  = MC_EOL_LEN;
            j++;

           server_query->query_vec_count = j;
        }
    }

    /* create polling structures */
    pollfds = apr_pcalloc(temp_pool, apr_hash_count(server_queries) * sizeof(apr_pollfd_t));
    
    rv = apr_pollset_create(&pollset, apr_hash_count(server_queries), temp_pool, 0);

    if (rv != APR_SUCCESS) {
        query_hash_index = apr_hash_first(temp_pool, server_queries);

        while (query_hash_index) {
            void *v;
            apr_hash_this(query_hash_index, NULL, NULL, &v);
            server_query = v;
            query_hash_index = apr_hash_next(query_hash_index);

            mget_conn_result(TRUE, TRUE, rv, mc, server_query->ms, server_query->conn,
                             server_query, values, server_queries);
        }

        return rv;
    }

    /* send all the queries */
    queries_sent = 0;
    query_hash_index = apr_hash_first(temp_pool, server_queries);

    while (query_hash_index) {
        void *v;
        apr_hash_this(query_hash_index, NULL, NULL, &v);
        server_query = v;
        query_hash_index = apr_hash_next(query_hash_index);

        conn = server_query->conn;
        ms = server_query->ms;

        for (i = 0, rv = APR_SUCCESS; i < veclen && rv == APR_SUCCESS; i += APR_MAX_IOVEC_SIZE) {
            rv = apr_socket_sendv(conn->sock, &(server_query->query_vec[i]),
                                  veclen-i>APR_MAX_IOVEC_SIZE ? APR_MAX_IOVEC_SIZE : veclen-i , &written);
        }

        if (rv != APR_SUCCESS) {
            mget_conn_result(FALSE, FALSE, rv, mc, ms, conn,
                             server_query, values, server_queries);
            continue;
        }

        pollfds[queries_sent].desc_type = APR_POLL_SOCKET;
        pollfds[queries_sent].reqevents = APR_POLLIN;
        pollfds[queries_sent].p = temp_pool;
        pollfds[queries_sent].desc.s = conn->sock;
        pollfds[queries_sent].client_data = (void *)server_query;
        apr_pollset_add (pollset, &pollfds[queries_sent]);

        queries_sent++;
    }

    while (queries_sent) {
        rv = apr_pollset_poll(pollset, MULT_GET_TIMEOUT, &queries_recvd, &activefds);

        if (rv != APR_SUCCESS) {
            /* timeout */
            queries_sent = 0;
            continue;
        }
        for (i = 0; i < queries_recvd; i++) {
            server_query = activefds[i].client_data;
            conn = server_query->conn;
            ms = server_query->ms;

           rv = get_server_line(conn);

           if (rv != APR_SUCCESS) {
               apr_pollset_remove (pollset, &activefds[i]);
               mget_conn_result(FALSE, FALSE, rv, mc, ms, conn,
                                server_query, values, server_queries);
               queries_sent--;
               continue;
           }

           if (strncmp(MS_VALUE, conn->buffer, MS_VALUE_LEN) == 0) {
               char *key;
               char *flags;
               char *length;
               char *last;
               char *data;
               apr_size_t len = 0;
               apr_bucket *e = NULL;

               key = apr_strtok(conn->buffer, " ", &last); /* just the VALUE, ignore */
               key = apr_strtok(NULL, " ", &last);
               flags = apr_strtok(NULL, " ", &last);
               length = apr_strtok(NULL, " ", &last);

               if (!length || !parse_size(length, &len)) {
                   rv = APR_EGENERAL;
               }
               else {
                   /* eat the trailing \r\n */
                   rv = apr_brigade_partition(conn->bb, len+2, &e);
               }
               if (rv != APR_SUCCESS) {
                   apr_pollset_remove (pollset, &activefds[i]);
                   mget_conn_result(TRUE, FALSE, rv, mc, ms, conn,
                                    server_query, values, server_queries);
                   queries_sent--;
                   continue;
               }

               value = apr_hash_get(values, key, strlen(key));
               if (value) {
                   apr_bucket_brigade *bbb;

                   bbb = apr_brigade_split(conn->bb, e);

                   rv = apr_brigade_pflatten(conn->bb, &data, &len, data_pool);
                   if (rv != APR_SUCCESS) {
                       apr_pollset_remove (pollset, &activefds[i]);
                       mget_conn_result(TRUE, FALSE, rv, mc, ms, conn,
                                        server_query, values, server_queries);
                       queries_sent--;
                       continue;
                   }

                   rv = apr_brigade_destroy(conn->bb);
                   if (rv != APR_SUCCESS) {
                       apr_pollset_remove (pollset, &activefds[i]);
                       mget_conn_result(TRUE, FALSE, rv, mc, ms, conn,
                                        server_query, values, server_queries);
                       queries_sent--;
                       continue;
                   }

                   conn->bb = bbb;

                   value->len = len - 2;
                   data[value->len] = '\0';
                   value->data = data;

                   value->status = rv;
                   value->flags = atoi(flags);

                   /* stay on the server */
                   i--;
               }
               else {
                   /* Server Sent back a key I didn't ask for or my
                    * hash is corrupt */
                   rv = APR_EGENERAL;
               }
           }
           else if (strncmp(MS_END, conn->buffer, MS_END_LEN) == 0) {
               /* this connection is done */
               apr_pollset_remove (pollset, &activefds[i]);
               ms_release_conn(ms, conn);
               apr_hash_set(server_queries, &ms, sizeof(ms), NULL);
               queries_sent--;
           }
           else {
               /* unknown reply? */
               rv = APR_EGENERAL;
           }
           if (rv != APR_SUCCESS) {
               apr_pollset_remove (pollset, &activefds[i]);
               mget_conn_result(TRUE, FALSE, rv, mc, ms, conn,
                                server_query, values, server_queries);
               queries_sent--;
           }
        } /* /for */
    } /* /while */
    
    query_hash_index = apr_hash_first(temp_pool, server_queries);
    while (query_hash_index) {
        void *v;
        apr_hash_this(query_hash_index, NULL, NULL, &v);
        server_query = v;
        query_hash_index = apr_hash_next(query_hash_index);
        
        conn = server_query->conn;
        ms = server_query->ms;
        
        mget_conn_result(TRUE, (rv == APR_SUCCESS), rv, mc, ms, conn,
                         server_query, values, server_queries);
        continue;
    }
    
    apr_pollset_destroy(pollset);
    apr_pool_clear(temp_pool);
    return APR_SUCCESS;
    
}



/**
 * Define all of the strings for stats
 */

#define STAT_pid MS_STAT " pid "
#define STAT_pid_LEN (sizeof(STAT_pid)-1)

#define STAT_uptime MS_STAT " uptime "
#define STAT_uptime_LEN (sizeof(STAT_uptime)-1)

#define STAT_time MS_STAT " time "
#define STAT_time_LEN (sizeof(STAT_time)-1)

#define STAT_version MS_STAT " version "
#define STAT_version_LEN (sizeof(STAT_version)-1)

#define STAT_pointer_size MS_STAT " pointer_size "
#define STAT_pointer_size_LEN (sizeof(STAT_pointer_size)-1)

#define STAT_rusage_user MS_STAT " rusage_user "
#define STAT_rusage_user_LEN (sizeof(STAT_rusage_user)-1)

#define STAT_rusage_system MS_STAT " rusage_system "
#define STAT_rusage_system_LEN (sizeof(STAT_rusage_system)-1)

#define STAT_curr_items MS_STAT " curr_items "
#define STAT_curr_items_LEN (sizeof(STAT_curr_items)-1)

#define STAT_total_items MS_STAT " total_items "
#define STAT_total_items_LEN (sizeof(STAT_total_items)-1)

#define STAT_bytes MS_STAT " bytes "
#define STAT_bytes_LEN (sizeof(STAT_bytes)-1)

#define STAT_curr_connections MS_STAT " curr_connections "
#define STAT_curr_connections_LEN (sizeof(STAT_curr_connections)-1)

#define STAT_total_connections MS_STAT " total_connections "
#define STAT_total_connections_LEN (sizeof(STAT_total_connections)-1)

#define STAT_connection_structures MS_STAT " connection_structures "
#define STAT_connection_structures_LEN (sizeof(STAT_connection_structures)-1)

#define STAT_cmd_get MS_STAT " cmd_get "
#define STAT_cmd_get_LEN (sizeof(STAT_cmd_get)-1)

#define STAT_cmd_set MS_STAT " cmd_set "
#define STAT_cmd_set_LEN (sizeof(STAT_cmd_set)-1)

#define STAT_get_hits MS_STAT " get_hits "
#define STAT_get_hits_LEN (sizeof(STAT_get_hits)-1)

#define STAT_get_misses MS_STAT " get_misses "
#define STAT_get_misses_LEN (sizeof(STAT_get_misses)-1)

#define STAT_evictions MS_STAT " evictions "
#define STAT_evictions_LEN (sizeof(STAT_evictions)-1)

#define STAT_bytes_read MS_STAT " bytes_read "
#define STAT_bytes_read_LEN (sizeof(STAT_bytes_read)-1)

#define STAT_bytes_written MS_STAT " bytes_written "
#define STAT_bytes_written_LEN (sizeof(STAT_bytes_written)-1)

#define STAT_limit_maxbytes MS_STAT " limit_maxbytes "
#define STAT_limit_maxbytes_LEN (sizeof(STAT_limit_maxbytes)-1)

#define STAT_threads MS_STAT " threads "
#define STAT_threads_LEN (sizeof(STAT_threads)-1)

static const char *stat_read_string(apr_pool_t *p, char *buf, apr_size_t len)
{
    /* remove trailing \r\n and null char */
    return apr_pstrmemdup(p, buf, len-2);
}

static apr_uint32_t stat_read_uint32(apr_pool_t *p, char *buf, apr_size_t  len)
{
    buf[len-2] = '\0';
    return atoi(buf);
}

static apr_uint64_t stat_read_uint64(apr_pool_t *p, char *buf, apr_size_t  len)
{
    buf[len-2] = '\0';
    return apr_atoi64(buf);
}

static apr_time_t stat_read_time(apr_pool_t *p, char *buf, apr_size_t  len)
{
    buf[len-2] = '\0';
    return apr_time_from_sec(atoi(buf));
}

static apr_time_t stat_read_rtime(apr_pool_t *p, char *buf, apr_size_t  len)
{
    char *tok;
    char *secs;
    char *usecs;
    const char *sep = ":.";

    buf[len-2] = '\0';

    secs = apr_strtok(buf, sep, &tok);
    usecs = apr_strtok(NULL, sep, &tok);
    if (secs && usecs) {
        return apr_time_make(atoi(secs), atoi(usecs));
    }
    else {
        return apr_time_make(0, 0);
    }
}

/**
 * I got tired of Typing. Meh. 
 *
 * TODO: Convert it to static tables to make it cooler.
 */

#define mc_stat_cmp(name) \
    strncmp(STAT_ ## name, conn->buffer, STAT_ ## name ## _LEN) == 0

#define mc_stat_str(name) \
    stat_read_string(p, conn->buffer + name, \
                     conn->blen - name)

#define mc_stat_uint32(name) \
    stat_read_uint32(p, conn->buffer + name, \
                     conn->blen - name)

#define mc_stat_uint64(name) \
    stat_read_uint64(p, conn->buffer + name, \
                     conn->blen - name)

#define mc_stat_time(name) \
    stat_read_time(p, conn->buffer + name, \
                     conn->blen - name)

#define mc_stat_rtime(name) \
    stat_read_rtime(p, conn->buffer + name, \
                     conn->blen - name)


#define mc_do_stat(name, type) \
    if (mc_stat_cmp(name)) { \
        stats-> name = mc_stat_ ## type ((STAT_ ## name ## _LEN)); \
    } 

static void update_stats(apr_pool_t *p, apr_memcache_conn_t *conn, 
                         apr_memcache_stats_t *stats)
{

    mc_do_stat(version, str)
    else mc_do_stat(pid, uint32)
    else mc_do_stat(uptime, uint32)
    else mc_do_stat(pointer_size, uint32)
    else mc_do_stat(time, time)
    else mc_do_stat(rusage_user, rtime)
    else mc_do_stat(rusage_system, rtime)
    else mc_do_stat(curr_items, uint32)
    else mc_do_stat(total_items, uint32)
    else mc_do_stat(bytes, uint64)
    else mc_do_stat(curr_connections, uint32)
    else mc_do_stat(total_connections, uint32)
    else mc_do_stat(connection_structures, uint32)
    else mc_do_stat(cmd_get, uint32)
    else mc_do_stat(cmd_set, uint32)
    else mc_do_stat(get_hits, uint32)
    else mc_do_stat(get_misses, uint32)
    else mc_do_stat(evictions, uint64)
    else mc_do_stat(bytes_read, uint64)
    else mc_do_stat(bytes_written, uint64)
    else mc_do_stat(limit_maxbytes, uint32)
    else mc_do_stat(threads, uint32)
}

APU_DECLARE(apr_status_t)
apr_memcache_stats(apr_memcache_server_t *ms,
                  apr_pool_t *p,
                  apr_memcache_stats_t **stats) 
{
    apr_memcache_stats_t *ret;
    apr_status_t rv;
    apr_memcache_conn_t *conn;
    apr_size_t written;
    struct iovec vec[2];

    rv = ms_find_conn(ms, &conn);

    if (rv != APR_SUCCESS) {
        return rv;
    }

    /* version\r\n */
    vec[0].iov_base = MC_STATS;
    vec[0].iov_len  = MC_STATS_LEN;

    vec[1].iov_base = MC_EOL;
    vec[1].iov_len  = MC_EOL_LEN;

    rv = apr_socket_sendv(conn->sock, vec, 2, &written);

    if (rv != APR_SUCCESS) {
        ms_bad_conn(ms, conn);
        return rv;
    }

    ret = apr_pcalloc(p, sizeof(apr_memcache_stats_t));

    do {
        rv = get_server_line(conn);
        if (rv != APR_SUCCESS) {
            ms_bad_conn(ms, conn);
            return rv;
        }

        if (strncmp(MS_END, conn->buffer, MS_END_LEN) == 0) {
            rv = APR_SUCCESS;
            break;
        }
        else if (strncmp(MS_STAT, conn->buffer, MS_STAT_LEN) == 0) {
            update_stats(p, conn, ret);
            continue;
        }
        else {
            rv = APR_EGENERAL;
            break;
        }

    } while(1);

    ms_release_conn(ms, conn);

    if (stats) {
        *stats = ret;
    }

    return rv;
}