一、安装c api
以此方式下载的zookeeper
wget "http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz"
c api源码位于zookeeper-3.4.14/zookeeper-client/zookeeper-client-c
cd zookeeper-3.4.14/zookeeper-client/zookeeper-client-c ./configure make sudo make install
安装后也可以在/usr/local/include/zookeeper中找到头文件，当然也可以把它拷走至自己的指定目录。
二、使用c api连接zookeeper
zookeeper_test.c
1 #include <zookeeper.h> 2 #include <zookeeper_log.h> 3 #include <zookeeper.jute.h> 4 #include <stdio.h> 5 6 //伪分布式部署 host list最好以配置文件形式，此处为测试程序，暂时写死 7 const char * host_list = "127.0.0.1:12181,127.0.0.1:12182,127.0.0.1:12183"; 8 void zk_watcher(zhandle_t *zh, int type, int state, const char *path,void *watcherCtx) 9 { 10 printf("zk_watcher: [type=%d] [state=%d] [path=%s] [watcher_ctx=%p]\n", type, state, path, watcherCtx); 11 } 12 13 void zk_exists(zhandle_t *zkhandle, const char *path) 14 { 15 struct Stat stat; 16 printf("zk_exists: ==========BEGIN============\n"); 17 int ret_code = zoo_exists(zkhandle, path, 0, &stat); 18 printf("zk_exists: [ret=%d]\n", ret_code); 19 if(ZOK == ret_code) 20 { 21 printf("zk_exists: [path=%s] [czxid=%ld] [mzxid=%ld] [version=%d] [cversion=%d] [child_num=%d]\n", 22 path, stat.czxid, stat.mzxid, stat.version, stat); 23 } 24 printf("zk_exists: ==========END============\n"); 25 } 26 27 int main() 28 { 29 int time_out = 50000; 30 zoo_set_debug_level(ZOO_LOG_LEVEL_DEBUG); 31 zhandle_t * zkhandle = zookeeper_init(host_list, zk_watcher, time_out, 0, NULL, 0); 32 if (NULL == zkhandle) 33 { 34 printf("main: connect to zk fail.\n"); 35 return -1; 36 } 37 zk_exists(zkhandle, "/"); 38 39 zookeeper_close(zkhandle); 40 41 return 0; 42 }
Makefile
1 ZK_CAPI_PATH := /usr/local 2 3 INC_PATH := ${ZK_CAPI_PATH}/include/zookeeper 4 SRC_PATH := ./*.c 5 LIB_PATH := ${ZK_CAPI_PATH}/lib 6 7 LIB_NAME := zookeeper_mt 8 9 EXE_NAME := zookeeper_test.exe 10 11 main: 12 gcc -g -DTHREADED ${SRC_PATH} -I ${INC_PATH} -o ${EXE_NAME} -L ${LIB_PATH} -l ${LIB_NAME} 13 clean: 14 rm ${EXE_NAME}
编译后运行
root@iZwz9hextk0ee6gik32377Z:~/zookeeper/c_test# make gcc -g -DTHREADED ./*.c -I /usr/local/include/zookeeper -o zookeeper_test.exe -L /usr/local/lib -l zookeeper_mt root@iZwz9hextk0ee6gik32377Z:~/zookeeper/c_test# ./zookeeper_test.exe 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@753: Client environment:zookeeper.version=zookeeper C client 3.4.14 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@757: Client environment:host.name=iZwz9hextk0ee6gik32377Z 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@764: Client environment:os.name=Linux 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@765: Client environment:os.arch=4.15.0-88-generic 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@766: Client environment:os.version=#88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@774: Client environment:user.name=root 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@782: Client environment:user.home=/root 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@log_env@794: Client environment:user.dir=/root/zookeeper/c_test 2020-04-11 11:30:04,628:26341(0x7fd9a61b3740):ZOO_INFO@zookeeper_init@827: Initiating client connection, host=127.0.0.1:12181,127.0.0.1:12182,127.0.0.1:12183 sessionTimeout=50000 watcher=0x559328a3b86a sessionId=0 sessionPasswd=<null> context=(nil) flags=0 2020-04-11 11:30:04,629:26341(0x7fd9a61b3740):ZOO_DEBUG@start_threads@221: starting threads... 2020-04-11 11:30:04,629:26341(0x7fd9a4f30700):ZOO_DEBUG@do_io@367: started IO thread zk_exists: ==========BEGIN============ 2020-04-11 11:30:04,629:26341(0x7fd9a472f700):ZOO_DEBUG@do_completion@458: started completion thread 2020-04-11 11:30:04,629:26341(0x7fd9a61b3740):ZOO_DEBUG@zoo_awexists@2894: Sending request xid=0x5e9139bd for path [/] to 127.0.0.1:12183 2020-04-11 11:30:04,633:26341(0x7fd9a4f30700):ZOO_INFO@check_events@1764: initiated connection to server [127.0.0.1:12183] 2020-04-11 11:30:04,635:26341(0x7fd9a4f30700):ZOO_INFO@check_events@1811: session establishment complete on server [127.0.0.1:12183], sessionId=0x30000314d590004, negotiated timeout=40000 2020-04-11 11:30:04,635:26341(0x7fd9a4f30700):ZOO_DEBUG@check_events@1817: Calling a watcher for a ZOO_SESSION_EVENT and the state=ZOO_CONNECTED_STATE 2020-04-11 11:30:04,635:26341(0x7fd9a472f700):ZOO_DEBUG@process_completions@2169: Calling a watcher for node [], type = -1 event=ZOO_SESSION_EVENT zk_watcher: [type=-1] [state=3] [path=] [watcher_ctx=(nil)] 2020-04-11 11:30:04,636:26341(0x7fd9a4f30700):ZOO_DEBUG@process_sync_completion@1929: Processing sync_completion with type=1 xid=0x5e9139bd rc=0 zk_exists: [ret=0] zk_exists: [path=/] [czxid=0] [mzxid=0] [version=0] [cversion=8] [child_num=2] zk_exists: ==========END============ 2020-04-11 11:30:04,636:26341(0x7fd9a4f30700):ZOO_DEBUG@do_io@445: IO thread terminated 2020-04-11 11:30:04,636:26341(0x7fd9a472f700):ZOO_DEBUG@do_completion@468: completion thread terminated 2020-04-11 11:30:04,636:26341(0x7fd9a61b3740):ZOO_INFO@zookeeper_close@2564: Closing zookeeper sessionId=0x30000314d590004 to [127.0.0.1:12183]
可以看到取到的“/”目录的信息：
zk_exists: [path=/] [czxid=0] [mzxid=0] [version=0] [cversion=8] [child_num=2]
实际从zookeeper client中得到的：
[zk: 127.0.0.1:12181(CONNECTED) 0] get / cZxid = 0x0 ctime = Thu Jan 01 08:00:00 CST 1970 mZxid = 0x0 mtime = Thu Jan 01 08:00:00 CST 1970 pZxid = 0x400000018 cversion = 8 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 0 numChildren = 2
三、create、delete、get znode