Examples with Session org.neo4j.driver.v1.Session used on opensource projects

Example 6 with Session

use of org.neo4j.driver.v1.Session in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldReadAndWriteToANewSessionCreatedAfterALeaderSwitch.

/*
       Create a session with empty arg list (no AccessMode arg), in a driver that was initialized with a bolt+routing
       URI, and ensure that it
       a) works against the Leader for reads and writes before a leader switch, and
       b) receives a SESSION EXPIRED after a leader switch, and
       c) keeps working if a new session is created after that exception, again with no access mode specified.
     */
@Test
public void shouldReadAndWriteToANewSessionCreatedAfterALeaderSwitch() throws Exception {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(1).startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    try (Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"))) {
        inExpirableSession(driver, Driver::session, (session) -> {
            // execute a write/read query
            session.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            Record record = session.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
            assertEquals(1, record.get("count").asInt());
            try {
                switchLeader(leader);
                session.run("CREATE (p:Person {name: {name} })").consume();
                fail("Should have thrown an exception as the leader went away mid session");
            } catch (SessionExpiredException sep) {
                // then
                assertEquals(String.format("Server at %s no longer accepts writes", leader.boltAdvertisedAddress()), sep.getMessage());
            } catch (InterruptedException e) {
            // ignored
            }
            return null;
        });
        inExpirableSession(driver, Driver::session, (session) -> {
            // execute a write/read query
            session.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            Record record = session.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
            assertEquals(2, record.get("count").asInt());
            return null;
        });
    }
}

Example 7 with Session

use of org.neo4j.driver.v1.Session in project neo4j by neo4j.

the class BoltCausalClusteringIT method sessionShouldExpireOnFailingReadQuery.

@Test
public void sessionShouldExpireOnFailingReadQuery() throws Exception {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(1).startCluster();
    CoreClusterMember coreServer = cluster.getCoreMemberById(0);
    Driver driver = GraphDatabase.driver(coreServer.routingURI(), AuthTokens.basic("neo4j", "neo4j"));
    inExpirableSession(driver, Driver::session, (session) -> {
        session.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
        return null;
    });
    try (Session readSession = driver.session(AccessMode.READ)) {
        // when
        connectedServer(readSession).shutdown();
        // then
        readSession.run("MATCH (n) RETURN n LIMIT 1").consume();
        fail("Should have thrown an exception as the read replica went away mid query");
    } catch (SessionExpiredException sep) {
        // then
        assertThat(sep.getMessage(), containsString("is no longer available"));
    } finally {
        driver.close();
    }
}

Example 8 with Session

use of org.neo4j.driver.v1.Session in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldNotBeAbleToWriteOnAReadSession.

@Test
public void shouldNotBeAbleToWriteOnAReadSession() throws Exception {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(0).startCluster();
    assertEventually("Failed to execute write query on read server", () -> {
        switchLeader(cluster.awaitLeader());
        CoreClusterMember leader = cluster.awaitLeader();
        Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"));
        try (Session session = driver.session(AccessMode.READ)) {
            // when
            session.run("CREATE (n:Person {name: 'Jim'})").consume();
            return false;
        } catch (ClientException ex) {
            assertEquals("Write queries cannot be performed in READ access mode.", ex.getMessage());
            return true;
        } finally {
            driver.close();
        }
    }, is(true), 30, SECONDS);
}

Example 9 with Session

use of org.neo4j.driver.v1.Session in project CloudStack-archive by CloudStack-extras.

the class StressTestDirectAttach method sshTest.

private static String sshTest(String host, String password) {
    int i = 0;
    if (host == null) {
        s_logger.info("Did not receive a host back from test, ignoring ssh test");
        return null;
    }
    if (password == null) {
        s_logger.info("Did not receive a password back from test, ignoring ssh test");
        return null;
    }
    // We will retry 5 times before quitting
    String result = null;
    int retry = 0;
    while (true) {
        try {
            if (retry > 0) {
                s_logger.info("Retry attempt : " + retry + " ...sleeping 120 seconds before next attempt. Account is " + _account.get());
                Thread.sleep(120000);
            }
            s_logger.info("Attempting to SSH into linux host " + host + " with retry attempt: " + retry + ". Account is " + _account.get());
            Connection conn = new Connection(host);
            conn.connect(null, 60000, 60000);
            s_logger.info("User + " + _account.get() + " ssHed successfully into linux host " + host);
            boolean isAuthenticated = conn.authenticateWithPassword("root", password);
            if (isAuthenticated == false) {
                s_logger.info("Authentication failed for root with password" + password);
                return "Authentication failed";
            }
            boolean success = false;
            String linuxCommand = null;
            if (i % 10 == 0)
                linuxCommand = "rm -rf *; wget http://192.168.1.250/dump.bin && ls -al dump.bin";
            else
                linuxCommand = "wget http://192.168.1.250/dump.bin && ls -al dump.bin";
            Session sess = conn.openSession();
            s_logger.info("User " + _account.get() + " executing : " + linuxCommand);
            sess.execCommand(linuxCommand);
            InputStream stdout = sess.getStdout();
            InputStream stderr = sess.getStderr();
            byte[] buffer = new byte[8192];
            while (true) {
                if ((stdout.available() == 0) && (stderr.available() == 0)) {
                    int conditions = sess.waitForCondition(ChannelCondition.STDOUT_DATA | ChannelCondition.STDERR_DATA | ChannelCondition.EOF, 120000);
                    if ((conditions & ChannelCondition.TIMEOUT) != 0) {
                        s_logger.info("Timeout while waiting for data from peer.");
                        return null;
                    }
                    if ((conditions & ChannelCondition.EOF) != 0) {
                        if ((conditions & (ChannelCondition.STDOUT_DATA | ChannelCondition.STDERR_DATA)) == 0) {
                            break;
                        }
                    }
                }
                while (stdout.available() > 0) {
                    success = true;
                    int len = stdout.read(buffer);
                    if (// this check is somewhat paranoid
                    len > 0)
                        s_logger.info(new String(buffer, 0, len));
                }
                while (stderr.available() > 0) {
                    /* int len = */
                    stderr.read(buffer);
                }
            }
            sess.close();
            conn.close();
            if (!success) {
                retry++;
                if (retry == MAX_RETRY_LINUX) {
                    result = "SSH Linux Network test fail";
                }
            }
            return result;
        } catch (Exception e) {
            retry++;
            s_logger.error("SSH Linux Network test fail with error");
            if (retry == MAX_RETRY_LINUX) {
                return "SSH Linux Network test fail with error " + e.getMessage();
            }
        }
        i++;
    }
}

Example 10 with Session

use of org.neo4j.driver.v1.Session in project CloudStack-archive by CloudStack-extras.

the class TestClient method sshTest.

private static String sshTest(String host) {
    if (host == null) {
        s_logger.info("Did not receive a host back from test, ignoring ssh test");
        return null;
    }
    // We will retry 5 times before quitting
    int retry = 0;
    while (true) {
        try {
            if (retry > 0) {
                s_logger.info("Retry attempt : " + retry + " ...sleeping 120 seconds before next attempt");
                Thread.sleep(120000);
            }
            s_logger.info("Attempting to SSH into linux host " + host + " with retry attempt: " + retry);
            Connection conn = new Connection(host);
            conn.connect(null, 60000, 60000);
            s_logger.info("SSHed successfully into linux host " + host);
            boolean isAuthenticated = conn.authenticateWithPassword("root", "password");
            if (isAuthenticated == false) {
                return "Authentication failed";
            }
            boolean success = false;
            Session sess = conn.openSession();
            s_logger.info("Executing : wget http://172.16.0.220/dump.bin");
            sess.execCommand("wget http://172.16.0.220/dump.bin && ls -al dump.bin");
            InputStream stdout = sess.getStdout();
            InputStream stderr = sess.getStderr();
            byte[] buffer = new byte[8192];
            while (true) {
                if ((stdout.available() == 0) && (stderr.available() == 0)) {
                    int conditions = sess.waitForCondition(ChannelCondition.STDOUT_DATA | ChannelCondition.STDERR_DATA | ChannelCondition.EOF, 120000);
                    if ((conditions & ChannelCondition.TIMEOUT) != 0) {
                        s_logger.info("Timeout while waiting for data from peer.");
                        return null;
                    }
                    if ((conditions & ChannelCondition.EOF) != 0) {
                        if ((conditions & (ChannelCondition.STDOUT_DATA | ChannelCondition.STDERR_DATA)) == 0) {
                            break;
                        }
                    }
                }
                while (stdout.available() > 0) {
                    success = true;
                    int len = stdout.read(buffer);
                    if (// this check is somewhat paranoid
                    len > 0)
                        s_logger.info(new String(buffer, 0, len));
                }
                while (stderr.available() > 0) {
                    int len = stderr.read(buffer);
                }
            }
            sess.close();
            conn.close();
            if (success) {
                return null;
            } else {
                retry++;
                if (retry == MAX_RETRY_LINUX) {
                    return "SSH Linux Network test fail";
                }
            }
        } catch (Exception e) {
            retry++;
            if (retry == MAX_RETRY_LINUX) {
                return "SSH Linux Network test fail with error " + e.getMessage();
            }
        }
    }
}