ZMQ lib change.

common/zmqclient.cpp

@@ -197,4 +197,36 @@ void ZmqClient::sendMsg(
     throw system_error(make_error_code(errc::io_error), message);
 }
 
+bool ZmqClient::wait(std::string& dbName,
+                     std::string& tableName,
+                     std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>>& kcos,
+                     std::vector<char>& buffer)
+{
+    SWSS_LOG_ENTER();
+    int rc;
+    for (int i = 0; true ; ++i)
+    {
+        rc = zmq_recv(m_socket, buffer.data(), buffer.size(), 0);
+        if (rc < 0)
+        {
+            if (zmq_errno() == EINTR && i <= MQ_MAX_RETRY)
+            {
+                continue;
+            }
+            SWSS_LOG_THROW("zmq_recv failed, zmqerrno: %d", zmq_errno());
+        }
+        if (rc >= (int)buffer.size())
+        {
+            SWSS_LOG_THROW(
+                "zmq_recv message was truncated (over %d bytes, received %d), increase buffer size, message DROPPED",
+                (int)buffer.size(), rc);
+        }
+        break;
+    }
+    buffer.at(rc) = 0; // make sure that we end string with zero before parse
+    kcos.clear();
+    BinarySerializer::deserializeBuffer(buffer.data(), buffer.size(), dbName, tableName, kcos);
+    return true;
+}
+
 }

common/zmqclient.h

@@ -24,6 +24,11 @@ class ZmqClient
                  const std::string& tableName,
                  const std::vector<KeyOpFieldsValuesTuple>& kcos,
                  std::vector<char>& sendbuffer);
+    bool wait(std::string& dbName,
+              std::string& tableName,
+              std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>>& kcos,
+              std::vector<char>& buffer);
+
 private:
     void initialize(const std::string& endpoint, const std::string& vrf);
 

common/zmqproducerstatetable.cpp

@@ -182,4 +182,11 @@ size_t ZmqProducerStateTable::dbUpdaterQueueSize()
     return m_asyncDBUpdater->queueSize();
 }
 
+bool ZmqProducerStateTable::wait(std::string& dbName,
+              std::string& tableName,
+              std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>>& kcos)
+{
+    return m_zmqClient.wait(dbName, tableName, kcos, m_sendbuffer);
+}
+
 }

common/zmqproducerstatetable.h

@@ -38,6 +38,12 @@ class ZmqProducerStateTable : public ProducerStateTable
     virtual void send(const std::vector<KeyOpFieldsValuesTuple> &kcos);
 
     size_t dbUpdaterQueueSize();
+
+    // This method should only be used if the ZmqClient enables one-to-one sync.
+    virtual bool wait(std::string& dbName,
+              std::string& tableName,
+              std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>>& kcos);
+
 private:
     void initialize(DBConnector *db, const std::string &tableName, bool dbPersistence);
 

common/zmqserver.cpp

@@ -166,4 +166,69 @@ void ZmqServer::mqPollThread()
     SWSS_LOG_NOTICE("mqPollThread end");
 }
 
+void ZmqServer::sendMsg(const std::string& dbName, const std::string& tableName,
+        const std::vector<swss::KeyOpFieldsValuesTuple>& values)
+{
+    int serializedlen = (int)BinarySerializer::serializeBuffer(
+                                                        m_buffer.data(),
+                                                        m_buffer.size(),
+                                                        dbName,
+                                                        tableName,
+                                                        values);
+
+    SWSS_LOG_DEBUG("sending: %d", serializedlen);
+    int zmq_err = 0;
+    int retry_delay = 10;
+    int rc = 0;
+    for (int i = 0; i <=  MQ_MAX_RETRY; ++i)
+    {
+        rc = zmq_send(m_socket, m_buffer.data(), serializedlen, 0);
+        if (rc >= 0)
+        {
+            m_allowZmqPoll = true;
+            SWSS_LOG_DEBUG("zmq sent %d bytes", serializedlen);
+            return;
+        }
+
+        zmq_err = zmq_errno();
+        // sleep (2 ^ retry time) * 10 ms
+        retry_delay *= 2;
+        if (zmq_err == EINTR
+            || zmq_err== EFSM)
+        {
+            // EINTR: interrupted by signal
+            // EFSM: socket state not ready
+            //       For example when ZMQ socket still not receive reply message from last sended package.
+            //       There was state machine inside ZMQ socket, when the socket is not in ready to send state, this
+            //       error will happen.
+            // for more detail, please check: http://api.zeromq.org/2-1:zmq-send
+            SWSS_LOG_DEBUG("zmq send retry, endpoint: %s, error: %d", m_endpoint.c_str(), zmq_err);
+            retry_delay = 0;
+        }
+        else if (zmq_err == EAGAIN)
+        {
+            // EAGAIN: ZMQ is full to need try again
+            SWSS_LOG_WARN("zmq is full, will retry in %d ms, endpoint: %s, error: %d", retry_delay, m_endpoint.c_str(), zmq_err);
+        }
+        else if (zmq_err == ETERM)
+        {
+            auto message =  "zmq connection break, endpoint: " + m_endpoint + ", error: " + to_string(rc);
+            SWSS_LOG_ERROR("%s", message.c_str());
+            throw system_error(make_error_code(errc::connection_reset), message);
+        }
+        else
+        {
+            // for other error, send failed immediately.
+            auto message =  "zmq send failed, endpoint: " + m_endpoint + ", error: " + to_string(rc);
+            SWSS_LOG_ERROR("%s", message.c_str());
+            throw system_error(make_error_code(errc::io_error), message);
+        }
+        usleep(retry_delay * 1000);
+    }
+    // failed after retry
+    auto message =  "zmq send failed, endpoint: " + m_endpoint + ", zmqerrno: " + to_string(zmq_err) + ":" + zmq_strerror(zmq_err) + ", msg length:" + to_string(serializedlen);
+    SWSS_LOG_ERROR("%s", message.c_str());
+    throw system_error(make_error_code(errc::io_error), message);
+}
+
 }

common/zmqserver.h

@@ -39,6 +39,9 @@ class ZmqServer
                                 const std::string tableName,
                                 ZmqMessageHandler* handler);
 
+    void sendMsg(const std::string& dbName, const std::string& tableName,
+        const std::vector<swss::KeyOpFieldsValuesTuple>& values);
+
 private:
     void handleReceivedData(const char* buffer, const size_t size);
 

tests/zmq_state_ut.cpp

@@ -288,6 +288,9 @@ static void testMethod(bool producerPersistence)
     // start consumer first, SHM can only have 1 consumer per table.
     thread *consumerThread = new thread(consumerWorker, testTableName, pullEndpoint, !producerPersistence);
 
+    // Wait for the consumer to start.
+    sleep(1);
+
     cout << "Starting " << NUMBER_OF_THREADS << " producers" << endl;
     /* Starting the producer before the producer */
     for (int i = 0; i < NUMBER_OF_THREADS; i++)
@@ -351,6 +354,9 @@ static void testBatchMethod(bool producerPersistence)
     // start consumer first, SHM can only have 1 consumer per table.
     thread *consumerThread = new thread(consumerWorker, testTableName, pullEndpoint, !producerPersistence);
 
+    // Wait for the consumer to start.
+    sleep(1);
+
     cout << "Starting " << NUMBER_OF_THREADS << " producers" << endl;
     /* Starting the producer before the producer */
     for (int i = 0; i < NUMBER_OF_THREADS; i++)
@@ -397,6 +403,94 @@ static void testBatchMethod(bool producerPersistence)
     cout << endl << "Done." << endl;
 }
 
+static bool zmq_done = false;
+static void zmqConsumerWorker(string tableName, string endpoint)
+{
+    cout << "Consumer thread started: " << tableName << endl;
+    DBConnector db(TEST_DB, 0, true);
+    ZmqServer server(endpoint);
+    ZmqConsumerStateTable c(&db, tableName, server);
+    Select cs;
+    cs.addSelectable(&c);
+    //validate received data
+    Selectable *selectcs;
+    std::deque<KeyOpFieldsValuesTuple> vkco;
+    int ret = 0;
+    while (!zmq_done)
+    {
+        ret = cs.select(&selectcs, 10, true);
+        if (ret == Select::OBJECT)
+        {
+            c.pops(vkco);
+            std::vector<swss::KeyOpFieldsValuesTuple> values;
+            values.push_back(KeyOpFieldsValuesTuple{"k", SET_COMMAND, std::vector<FieldValueTuple>{FieldValueTuple{"f", "v"}}});
+            server.sendMsg(TEST_DB, tableName, values);
+        }
+    }
+    allDataReceived = true;
+    cout << "Consumer thread ended: " << tableName << endl;
+}
+TEST(ZmqOneToOneSync, test)
+{
+    std::string testTableName = "ZMQ_PROD_CONS_UT";
+    std::string pushEndpoint = "tcp://localhost:1234";
+    std::string pullEndpoint = "tcp://*:1234";
+    // start consumer first, SHM can only have 1 consumer per table.
+    thread *consumerThread = new thread(zmqConsumerWorker, testTableName, pullEndpoint);
+    // Wait for the consumer to be ready.
+    sleep(1);
+    DBConnector db(TEST_DB, 0, true);
+    ZmqClient client(pushEndpoint);
+    ZmqProducerStateTable p(&db, testTableName, client);
+    std::vector<KeyOpFieldsValuesTuple> kcos;
+    kcos.push_back(KeyOpFieldsValuesTuple{"k", SET_COMMAND, std::vector<FieldValueTuple>{FieldValueTuple{"f", "v"}}});
+    std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>> kcos_p;
+    std::string dbName, tableName;
+    for (int i =0; i < 3; ++i)
+    {
+        p.send(kcos);
+        ASSERT_TRUE(p.wait(dbName, tableName, kcos_p));
+        EXPECT_EQ(dbName, TEST_DB);
+        EXPECT_EQ(tableName, testTableName);
+        ASSERT_EQ(kcos_p.size(), 1);
+        EXPECT_EQ(kfvKey(*kcos_p[0]), "k");
+        EXPECT_EQ(kfvOp(*kcos_p[0]), SET_COMMAND);
+        std::vector<FieldValueTuple> cos = std::vector<FieldValueTuple>{FieldValueTuple{"f", "v"}};
+        EXPECT_EQ(kfvFieldsValues(*kcos_p[0]), cos);
+    }
+    zmq_done = true;
+    consumerThread->join();
+    delete consumerThread;
+}
+TEST(ZmqOneToOneSyncClientError, test)
+{
+    std::string testTableName = "ZMQ_PROD_CONS_UT";
+    std::string pushEndpoint = "tcp://localhost:1234";
+    DBConnector db(TEST_DB, 0, true);
+    ZmqClient client(pushEndpoint);
+    ZmqProducerStateTable p(&db, testTableName, client);
+    std::vector<KeyOpFieldsValuesTuple> kcos;
+    kcos.push_back(KeyOpFieldsValuesTuple{"k", SET_COMMAND, std::vector<FieldValueTuple>{}});
+    std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>> kcos_p;
+    std::string dbName, tableName;
+    p.send(kcos);
+    // Wait will timeout without server reply.
+    EXPECT_FALSE(p.wait(dbName, tableName, kcos_p));
+    // Send will return error without server reply.
+    EXPECT_THROW(p.send(kcos), std::system_error);
+}
+TEST(ZmqOneToOneSyncServerError, test)
+{
+    std::string testTableName = "ZMQ_PROD_CONS_UT";
+    std::string pullEndpoint = "tcp://*:1234";
+    DBConnector db(TEST_DB, 0, true);
+    ZmqServer server(pullEndpoint);
+    ZmqConsumerStateTable c(&db, testTableName, server);
+    std::vector<swss::KeyOpFieldsValuesTuple> values;
+    values.push_back(KeyOpFieldsValuesTuple{"k", SET_COMMAND, std::vector<FieldValueTuple>{FieldValueTuple{"f", "v"}}});
+    // Send will return error without client request.
+    EXPECT_THROW(server.sendMsg(TEST_DB, testTableName, values), std::system_error);
+}
 TEST(ZmqConsumerStateTable, test)
 {
     // test with persist by consumer