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apr_redis.h
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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. */ /** * @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_RC 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; struct { int major; int minor; int patch; char *number; } version; }; 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 flags any flags set by the client for this key */ APU_DECLARE(apr_status_t) apr_redis_set(apr_redis_t *rc, const char *key, char *baton, const apr_size_t data_size, 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); /** * Query a server's version * @param rs server to query * @param p Pool to allocate answer from * @param baton location to store server version string */ APU_DECLARE(apr_status_t) apr_redis_version(apr_redis_server_t *rs, apr_pool_t *p, char **baton); /** * Query a server's INFO * @param rs server to query * @param p Pool to allocate answer from * @param baton location to store server INFO response string */ APU_DECLARE(apr_status_t) apr_redis_info(apr_redis_server_t *rs, apr_pool_t *p, char **baton); /** * Increments a value * @param rc client to use * @param key null terminated string containing the key * @param inc number to increment by * @param new_value new value after incrementing */ APU_DECLARE(apr_status_t) apr_redis_incr(apr_redis_t *rc, const char *key, apr_int32_t inc, apr_uint32_t *new_value); /** * Decrements a value * @param rc client to use * @param key null terminated string containing the key * @param inc number to decrement by * @param new_value new value after decrementing */ APU_DECLARE(apr_status_t) apr_redis_decr(apr_redis_t *rc, const char *key, apr_int32_t inc, apr_uint32_t *new_value); /** * Pings the server * @param rs Server to ping */ APU_DECLARE(apr_status_t) apr_redis_ping(apr_redis_server_t *rs); /** * Gets multiple values from the server, allocating the values out of p * @param rc 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_redis_value_t keyed by strings, contains the * result of the multiget call. * @return */ APU_DECLARE(apr_status_t) apr_redis_multgetp(apr_redis_t *rc, apr_pool_t *temp_pool, apr_pool_t *data_pool, apr_hash_t *values); typedef enum { APR_RS_SERVER_MASTER, /**< Server is a master */ APR_RS_SERVER_SLAVE, /**< Server is a slave */ APR_RS_SERVER_UNKNOWN /**< Server role is unknown */ } apr_redis_server_role_t; typedef struct { /* # Server */ /** Major version number of this server */ apr_uint32_t major; /** Minor version number of this server */ apr_uint32_t minor; /** Patch version number of this server */ apr_uint32_t patch; /** Process id of this server process */ apr_uint32_t process_id; /** Number of seconds this server has been running */ apr_uint32_t uptime_in_seconds; /** Bitsize of the arch on the current machine */ apr_uint32_t arch_bits; /* # Clients */ /** Number of connected clients */ apr_uint32_t connected_clients; /** Number of blocked clients */ apr_uint32_t blocked_clients; /* # Memory */ /** Max memory of this server */ apr_uint64_t maxmemory; /** Amount of used memory */ apr_uint64_t used_memory; /** Total memory available on this server */ apr_uint64_t total_system_memory; /* # Stats */ /** Total connections received */ apr_uint64_t total_connections_received; /** Total commands processed */ apr_uint64_t total_commands_processed; /** Total commands rejected */ apr_uint64_t rejected_connections; /** Total net input bytes */ apr_uint64_t total_net_input_bytes; /** Total net output bytes */ apr_uint64_t total_net_output_bytes; /** Keyspace hits */ apr_uint64_t keyspace_hits; /** Keyspace misses */ apr_uint64_t keyspace_misses; /* # Replication */ /** Role */ apr_redis_server_role_t role; /** Number of connected slave */ apr_uint32_t connected_slaves; /* # CPU */ /** Accumulated CPU user time for this process */ apr_uint32_t used_cpu_sys; /** Accumulated CPU system time for this process */ apr_uint32_t used_cpu_user; /* # Cluster */ /** Is cluster enabled */ apr_uint32_t cluster_enabled; } apr_redis_stats_t; /** * Query a server for statistics * @param rs server to query * @param p Pool to allocate answer from * @param stats location of the new statistics structure */ APU_DECLARE(apr_status_t) apr_redis_stats(apr_redis_server_t *rs, apr_pool_t *p, apr_redis_stats_t **stats); /** @} */ #ifdef __cplusplus } #endif #endif /* APR_REDIS_H */