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+/* 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.
+ */
+
+#ifndef APR_MEMCACHE_H
+#define APR_MEMCACHE_H
+
+/**
+ * @file apr_memcache.h
+ * @brief Client interface for memcached
+ * @remark To use this interface you must have a separate memcached
+ * server running. See the memcached website at http://www.danga.com/memcached/
+ * for more information.
+ */
+
+#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 */
+
+/**
+ * @defgroup APR_Util_MC Memcached Client Routines
+ * @ingroup APR_Util
+ * @{
+ */
+
+/** Specifies the status of a memcached server */
+typedef enum
+{
+ APR_MC_SERVER_LIVE, /**< Server is alive and responding to requests */
+ APR_MC_SERVER_DEAD /**< Server is not responding to requests */
+} apr_memcache_server_status_t;
+
+/** Opaque memcache client connection object */
+typedef struct apr_memcache_conn_t apr_memcache_conn_t;
+
+/** Memcache Server Info Object */
+typedef struct apr_memcache_server_t apr_memcache_server_t;
+struct apr_memcache_server_t
+{
+ const char *host; /**< Hostname of this Server */
+ apr_port_t port; /**< Port of this Server */
+ apr_memcache_server_status_t status; /**< @see apr_memcache_server_status_t */
+#if APR_HAS_THREADS || defined(DOXYGEN)
+ apr_reslist_t *conns; /**< Resource list of actual client connections */
+#else
+ apr_memcache_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;
+};
+
+/* 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_memcache_hash_func)(void *baton,
+ const char *data,
+ const apr_size_t data_len);
+
+typedef struct apr_memcache_t apr_memcache_t;
+
+/* Custom Server Select callback function prototype.
+* @param baton user selected baton
+* @param mc memcache instance, use mc->live_servers to select a node
+* @param hash hash of the selected key.
+*/
+typedef apr_memcache_server_t* (*apr_memcache_server_func)(void *baton,
+ apr_memcache_t *mc,
+ const apr_uint32_t hash);
+
+/** Container for a set of memcached servers */
+struct apr_memcache_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_memcache_server_t **live_servers; /**< Array of Servers */
+ apr_pool_t *p; /** Pool to use for allocations */
+ void *hash_baton;
+ apr_memcache_hash_func hash_func;
+ void *server_baton;
+ apr_memcache_server_func server_func;
+};
+
+/** Returned Data from a multiple get */
+typedef struct
+{
+ apr_status_t status;
+ const char* key;
+ apr_size_t len;
+ char *data;
+ apr_uint16_t flags;
+} apr_memcache_value_t;
+
+/**
+ * Creates a crc32 hash used to split keys between servers
+ * @param mc The memcache 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 memcached clients.
+ */
+APU_DECLARE(apr_uint32_t) apr_memcache_hash(apr_memcache_t *mc,
+ const char *data,
+ const apr_size_t data_len);
+
+/**
+ * Pure CRC32 Hash. Used by some clients.
+ */
+APU_DECLARE(apr_uint32_t) apr_memcache_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_memcache_hash_default(void *baton,
+ const char *data,
+ const apr_size_t data_len);
+
+/**
+ * Picks a server based on a hash
+ * @param mc The memcache client object to use
+ * @param hash Hashed value of a Key
+ * @return server that controls specified hash
+ * @see apr_memcache_hash
+ */
+APU_DECLARE(apr_memcache_server_t *) apr_memcache_find_server_hash(apr_memcache_t *mc,
+ const apr_uint32_t hash);
+
+/**
+ * server selection compatible with the standard Perl Client.
+ */
+APU_DECLARE(apr_memcache_server_t *) apr_memcache_find_server_hash_default(void *baton,
+ apr_memcache_t *mc,
+ const apr_uint32_t hash);
+
+/**
+ * Adds a server to a client object
+ * @param mc The memcache 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_memcache_add_server(apr_memcache_t *mc,
+ apr_memcache_server_t *server);
+
+
+/**
+ * Finds a Server object based on a hostname/port pair
+ * @param mc The memcache 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_memcache_server_t *) apr_memcache_find_server(apr_memcache_t *mc,
+ const char *host,
+ apr_port_t port);
+
+/**
+ * Enables a Server for use again
+ * @param mc The memcache client object to use
+ * @param ms Server to Activate
+ */
+APU_DECLARE(apr_status_t) apr_memcache_enable_server(apr_memcache_t *mc,
+ apr_memcache_server_t *ms);
+
+
+/**
+ * Disable a Server
+ * @param mc The memcache client object to use
+ * @param ms Server to Disable
+ */
+APU_DECLARE(apr_status_t) apr_memcache_disable_server(apr_memcache_t *mc,
+ apr_memcache_server_t *ms);
+
+/**
+ * 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 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_memcache_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_memcache_server_t **ns);
+/**
+ * Creates a new memcached client object
+ * @param p Pool to use
+ * @param max_servers maximum number of servers
+ * @param flags Not currently used
+ * @param mc location of the new memcache client object
+ */
+APU_DECLARE(apr_status_t) apr_memcache_create(apr_pool_t *p,
+ apr_uint16_t max_servers,
+ apr_uint32_t flags,
+ apr_memcache_t **mc);
+
+/**
+ * Gets a value from the server, allocating the value out of p
+ * @param mc 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_memcache_getp(apr_memcache_t *mc,
+ apr_pool_t *p,
+ const char* key,
+ char **baton,
+ apr_size_t *len,
+ apr_uint16_t *flags);
+
+
+/**
+ * Add a key to a hash for a multiget query
+ * if the hash (*value) is NULL it will be created
+ * @param data_pool pool from where the hash and their items are created from
+ * @param key null terminated string containing the key
+ * @param values hash of keys and values that this key will be added to
+ * @return
+ */
+APU_DECLARE(void) apr_memcache_add_multget_key(apr_pool_t *data_pool,
+ const char* key,
+ apr_hash_t **values);
+
+/**
+ * Gets multiple values from the server, allocating the values out of p
+ * @param mc client to use
+ * @param temp_pool Pool used for temporary allocations. May be cleared inside this
+ * call.
+ * @param data_pool Pool used to allocate data for the returned values.
+ * @param values hash of apr_memcache_value_t keyed by strings, contains the
+ * result of the multiget call.
+ * @return
+ */
+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);
+
+/**
+ * Sets a value by key on the server
+ * @param mc 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_memcache_set(apr_memcache_t *mc,
+ const char *key,
+ char *baton,
+ const apr_size_t data_size,
+ apr_uint32_t timeout,
+ apr_uint16_t flags);
+
+/**
+ * Adds value by key on the server
+ * @param mc 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 for the data to live on the server
+ * @param flags any flags set by the client for this key
+ * @return APR_SUCCESS if the key was added, APR_EEXIST if the key
+ * already exists on the server.
+ */
+APU_DECLARE(apr_status_t) apr_memcache_add(apr_memcache_t *mc,
+ const char *key,
+ char *baton,
+ const apr_size_t data_size,
+ apr_uint32_t timeout,
+ apr_uint16_t flags);
+
+/**
+ * Replaces value by key on the server
+ * @param mc 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 for the data to live on the server
+ * @param flags any flags set by the client for this key
+ * @return APR_SUCCESS if the key was added, APR_EEXIST if the key
+ * did not exist on the server.
+ */
+APU_DECLARE(apr_status_t) apr_memcache_replace(apr_memcache_t *mc,
+ 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 mc 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_memcache_delete(apr_memcache_t *mc,
+ const char *key,
+ apr_uint32_t timeout);
+
+/**
+ * Increments a value
+ * @param mc client to use
+ * @param key null terminated string containing the key
+ * @param n number to increment by
+ * @param nv new value after incrementing
+ */
+APU_DECLARE(apr_status_t) apr_memcache_incr(apr_memcache_t *mc,
+ const char *key,
+ apr_int32_t n,
+ apr_uint32_t *nv);
+
+/**
+ * Decrements a value
+ * @param mc client to use
+ * @param key null terminated string containing the key
+ * @param n number to decrement by
+ * @param new_value new value after decrementing
+ */
+APU_DECLARE(apr_status_t) apr_memcache_decr(apr_memcache_t *mc,
+ const char *key,
+ apr_int32_t n,
+ apr_uint32_t *new_value);
+
+/**
+ * Query a server's version
+ * @param ms server to query
+ * @param p Pool to allocate answer from
+ * @param baton location to store server version string
+ * @param len length of the server version string
+ */
+APU_DECLARE(apr_status_t) apr_memcache_version(apr_memcache_server_t *ms,
+ apr_pool_t *p,
+ char **baton);
+
+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_memcache_stats_t;
+
+/**
+ * Query a server for statistics
+ * @param ms server to query
+ * @param p Pool to allocate answer from
+ * @param stats location of the new statistics structure
+ */
+APU_DECLARE(apr_status_t) apr_memcache_stats(apr_memcache_server_t *ms,
+ apr_pool_t *p,
+ apr_memcache_stats_t **stats);
+
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* APR_MEMCACHE_H */