zookeeper/zookeeper-client/zookeeper-client-c/tests/TestClientRetry.cc

/**
 * 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 <cppunit/extensions/HelperMacros.h>
#include "CppAssertHelper.h"

#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

#include "Vector.h"
using namespace std;

#include <zookeeper.h>

#include "Util.h"
#include "WatchUtil.h"

class Zookeeper_clientretry : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(Zookeeper_clientretry);
#ifdef THREADED
    CPPUNIT_TEST(testRetry);
#endif
    CPPUNIT_TEST_SUITE_END();

    static void watcher(zhandle_t *, int type, int state, const char *path,void*v){
        watchctx_t *ctx = (watchctx_t*)v;

        if (state == ZOO_CONNECTED_STATE) {
            ctx->connected = true;
        } else {
            ctx->connected = false;
        }
        if (type != ZOO_SESSION_EVENT) {
            evt_t evt;
            evt.path = path;
            evt.type = type;
            ctx->putEvent(evt);
        }
    }

    static const char hostPorts[];

    const char *getHostPorts() {
        return hostPorts;
    }

    zhandle_t *createClient(watchctx_t *ctx) {
        zhandle_t *zk = zookeeper_init(hostPorts, watcher, 10000, 0,
                                       ctx, 0);
        ctx->zh = zk;
        sleep(1);
        return zk;
    }
    
    FILE *logfile;
public:

    Zookeeper_clientretry() {
      logfile = openlogfile("Zookeeper_clientretry");
    }

    ~Zookeeper_clientretry() {
      if (logfile) {
        fflush(logfile);
        fclose(logfile);
        logfile = 0;
      }
    }

    void setUp()
    {
        zoo_set_log_stream(logfile);

        char cmd[1024];
        sprintf(cmd, "%s stop %s", ZKSERVER_CMD, getHostPorts());
        CPPUNIT_ASSERT(system(cmd) == 0);

        /* we are testing that if max cnxns is exceeded the server does the right thing */
        sprintf(cmd, "ZKMAXCNXNS=1 %s startClean %s", ZKSERVER_CMD, getHostPorts());
        CPPUNIT_ASSERT(system(cmd) == 0);

        struct sigaction act;
        act.sa_handler = SIG_IGN;
        sigemptyset(&act.sa_mask);
        act.sa_flags = 0;
        CPPUNIT_ASSERT(sigaction(SIGPIPE, &act, NULL) == 0);
    }
    
    void tearDown()
    {
        char cmd[1024];
        sprintf(cmd, "%s stop %s", ZKSERVER_CMD, getHostPorts());
        CPPUNIT_ASSERT(system(cmd) == 0);

        /* restart the server in "normal" mode */
        sprintf(cmd, "%s startClean %s", ZKSERVER_CMD, getHostPorts());
        CPPUNIT_ASSERT(system(cmd) == 0);

        struct sigaction act;
        act.sa_handler = SIG_IGN;
        sigemptyset(&act.sa_mask);
        act.sa_flags = 0;
        CPPUNIT_ASSERT(sigaction(SIGPIPE, &act, NULL) == 0);
    }

    bool waitForEvent(zhandle_t *zh, watchctx_t *ctx, int seconds) {
        time_t expires = time(0) + seconds;
        while(ctx->countEvents() == 0 && time(0) < expires) {
            yield(zh, 1);
        }
        return ctx->countEvents() > 0;
    }

    static zhandle_t *async_zk;

    void testRetry()
    {
      watchctx_t ctx1, ctx2;
      zhandle_t *zk1 = createClient(&ctx1);
      CPPUNIT_ASSERT_EQUAL(true, ctx1.waitForConnected(zk1));
      zhandle_t *zk2 = createClient(&ctx2);
      zookeeper_close(zk1);
      CPPUNIT_ASSERT_EQUAL(true, ctx2.waitForConnected(zk2));
      ctx1.zh = 0;  
    }
};

zhandle_t *Zookeeper_clientretry::async_zk;
const char Zookeeper_clientretry::hostPorts[] = "127.0.0.1:22181";
CPPUNIT_TEST_SUITE_REGISTRATION(Zookeeper_clientretry);