func Dial(node string, keyspace string, timeout time.Duration) (*CassConnection, error) {
// resolve the address
addr, err := net.ResolveTCPAddr("tcp", node)
if err != nil {
return nil, err
}
// get a socket
sock, err := thrift.NewTNonblockingSocketAddr(addr)
if err != nil {
return nil, err
}
sock.SetTimeout(int64(timeout))
// build the client
transport := thriftutils.NewTFramedTransport(sock)
protocolFactory := thrift.NewTBinaryProtocolFactoryDefault()
cli := cassandra.NewCassandraClientFactory(transport, protocolFactory)
// connect, with a timeout of `timeout`
ch := make(chan bool, 1)
go func() {
err = transport.Open()
ch <- true
}()
timedOut := false
select {
case <-time.After(timeout):
timedOut = true
case <-ch:
}
if timedOut {
return nil, ErrorConnectionTimeout
}
// get the version and check for min version and what not
ver, err := cli.DescribeVersion()
if err != nil {
transport.Close()
return nil, err
}
log.Print("Opened new connection, protocol version: ", ver)
return &CassConnection{sock, transport, cli, node, keyspace, protocolFactory}, nil
}
func newConnection(node, keyspace string, timeout int, authentication map[string]string) (*connection, error) {
addr, err := net.ResolveTCPAddr("tcp", node)
if err != nil {
return nil, err
}
c := &connection{node: node}
c.socket, err = thrift.NewTNonblockingSocketAddr(addr)
if err != nil {
return nil, err
}
// socket not open yet, so no error expected. it expects nanos, we have milis, so it's 1e6
c.socket.SetTimeout(int64(timeout) * 1e6)
c.transport = thrift.NewTFramedTransport(c.socket)
protocolFactory := thrift.NewTBinaryProtocolFactoryDefault()
c.client = cassandra.NewCassandraClientFactory(c.transport, protocolFactory)
// simulate timeout support for the underlying Dial() in .Open(). needless to say this sucks
// restore sanity to this for Go v1 with the new DialTimeout() func
ch := make(chan bool, 1)
go func() {
err = c.transport.Open()
ch <- true
}()
timedOut := false
select {
case <-time.After(time.Duration(timeout) * time.Millisecond):
timedOut = true
case <-ch:
}
if timedOut {
return nil, ErrorConnectionTimeout
}
if err != nil {
return nil, err
}
version, err := c.client.DescribeVersion()
if err != nil {
c.close()
return nil, err
}
versionComponents := strings.Split(version, ".")
if len(versionComponents) < 1 {
return nil, ErrorInvalidThriftVersion
}
majorVersion, err := strconv.Atoi(versionComponents[0])
if err != nil {
return nil, ErrorInvalidThriftVersion
}
if majorVersion < LOWEST_COMPATIBLE_VERSION {
return nil, ErrorWrongThriftVersion
}
if len(authentication) > 0 {
ar := cassandra.NewAuthenticationRequest()
ar.Credentials = thrift.NewTMap(thrift.STRING, thrift.STRING, 1)
for k, v := range authentication {
ar.Credentials.Set(k, v)
}
autE, auzE, err := c.client.Login(ar)
if autE != nil {
return nil, ErrorAuthenticationFailed
}
if auzE != nil {
return nil, ErrorAuthorizationFailed
}
if err != nil {
return nil, err
}
}
ire, err := c.client.SetKeyspace(keyspace)
if err != nil {
c.close()
return nil, err
}
if ire != nil {
c.close()
return nil, ErrorSetKeyspace
}
c.keyspace = keyspace
return c, nil
}
func newConnection(node, keyspace string, timeout int) (*connection, error) {
addr, err := net.ResolveTCPAddr("tcp", node)
if err != nil {
return nil, err
}
c := &connection{node: node}
c.socket, err = thrift.NewTNonblockingSocketAddr(addr)
if err != nil {
return nil, err
}
// socket not open yet, so no error expected. it expects nanos, we have milis, so it's 1e6
c.socket.SetTimeout(int64(timeout) * 1e6)
c.transport = thrift.NewTFramedTransport(c.socket)
protocolFactory := thrift.NewTBinaryProtocolFactoryDefault()
c.client = cassandra.NewCassandraClientFactory(c.transport, protocolFactory)
// simulate timeout support for the underlying Dial() in .Open(). needless to say this sucks
// restore sanity to this for Go v1 with the new DialTimeout() func
ch := make(chan bool, 1)
go func() {
err = c.transport.Open()
ch <- true
}()
timedOut := false
select {
case <-time.After(time.Duration(timeout) * time.Millisecond):
timedOut = true
case <-ch:
}
if timedOut {
return nil, ErrorConnectionTimeout
}
if err != nil {
return nil, err
}
version, err := c.client.DescribeVersion()
if err != nil {
c.close()
return nil, err
}
versionComponents := strings.Split(version, ".")
if len(versionComponents) < 1 {
return nil, errors.New(fmt.Sprint("Cannot parse the Thrift API version number: ", version))
}
majorVersion, err := strconv.Atoi(versionComponents[0])
if err != nil {
return nil, errors.New(fmt.Sprint("Cannot parse the Thrift API version number: ", version))
}
if majorVersion < LOWEST_COMPATIBLE_VERSION {
return nil, errors.New(fmt.Sprint("Unsupported Thrift API version, lowest supported is ", LOWEST_COMPATIBLE_VERSION,
", server reports ", majorVersion))
}
ire, err := c.client.SetKeyspace(keyspace)
if err != nil {
c.close()
return nil, err
}
if ire != nil {
c.close()
return nil, errors.New("Cannot set the keyspace")
}
c.keyspace = keyspace
return c, nil
}