[VOL-4638] Initial commit
Change-Id: I5e785d017e1d27783b24591b52f20f442895e602
diff --git a/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go b/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go
new file mode 100644
index 0000000..4c59ae9
--- /dev/null
+++ b/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go
@@ -0,0 +1,149 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed 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.
+
+package utils
+
+import (
+ "context"
+ "errors"
+ "fmt"
+ "io"
+ "net"
+ "time"
+
+ "github.com/uber/jaeger-client-go/log"
+ "github.com/uber/jaeger-client-go/thrift"
+
+ "github.com/uber/jaeger-client-go/thrift-gen/agent"
+ "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+ "github.com/uber/jaeger-client-go/thrift-gen/zipkincore"
+)
+
+// UDPPacketMaxLength is the max size of UDP packet we want to send, synced with jaeger-agent
+const UDPPacketMaxLength = 65000
+
+// AgentClientUDP is a UDP client to Jaeger agent that implements agent.Agent interface.
+type AgentClientUDP struct {
+ agent.Agent
+ io.Closer
+
+ connUDP udpConn
+ client *agent.AgentClient
+ maxPacketSize int // max size of datagram in bytes
+ thriftBuffer *thrift.TMemoryBuffer // buffer used to calculate byte size of a span
+}
+
+type udpConn interface {
+ Write([]byte) (int, error)
+ SetWriteBuffer(int) error
+ Close() error
+}
+
+// AgentClientUDPParams allows specifying options for initializing an AgentClientUDP. An instance of this struct should
+// be passed to NewAgentClientUDPWithParams.
+type AgentClientUDPParams struct {
+ HostPort string
+ MaxPacketSize int
+ Logger log.Logger
+ DisableAttemptReconnecting bool
+ AttemptReconnectInterval time.Duration
+}
+
+// NewAgentClientUDPWithParams creates a client that sends spans to Jaeger Agent over UDP.
+func NewAgentClientUDPWithParams(params AgentClientUDPParams) (*AgentClientUDP, error) {
+ // validate hostport
+ if _, _, err := net.SplitHostPort(params.HostPort); err != nil {
+ return nil, err
+ }
+
+ if params.MaxPacketSize == 0 {
+ params.MaxPacketSize = UDPPacketMaxLength
+ }
+
+ if params.Logger == nil {
+ params.Logger = log.StdLogger
+ }
+
+ if !params.DisableAttemptReconnecting && params.AttemptReconnectInterval == 0 {
+ params.AttemptReconnectInterval = time.Second * 30
+ }
+
+ thriftBuffer := thrift.NewTMemoryBufferLen(params.MaxPacketSize)
+ protocolFactory := thrift.NewTCompactProtocolFactory()
+ client := agent.NewAgentClientFactory(thriftBuffer, protocolFactory)
+
+ var connUDP udpConn
+ var err error
+
+ if params.DisableAttemptReconnecting {
+ destAddr, err := net.ResolveUDPAddr("udp", params.HostPort)
+ if err != nil {
+ return nil, err
+ }
+
+ connUDP, err = net.DialUDP(destAddr.Network(), nil, destAddr)
+ if err != nil {
+ return nil, err
+ }
+ } else {
+ // host is hostname, setup resolver loop in case host record changes during operation
+ connUDP, err = newReconnectingUDPConn(params.HostPort, params.AttemptReconnectInterval, net.ResolveUDPAddr, net.DialUDP, params.Logger)
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ if err := connUDP.SetWriteBuffer(params.MaxPacketSize); err != nil {
+ return nil, err
+ }
+
+ return &AgentClientUDP{
+ connUDP: connUDP,
+ client: client,
+ maxPacketSize: params.MaxPacketSize,
+ thriftBuffer: thriftBuffer,
+ }, nil
+}
+
+// NewAgentClientUDP creates a client that sends spans to Jaeger Agent over UDP.
+func NewAgentClientUDP(hostPort string, maxPacketSize int) (*AgentClientUDP, error) {
+ return NewAgentClientUDPWithParams(AgentClientUDPParams{
+ HostPort: hostPort,
+ MaxPacketSize: maxPacketSize,
+ })
+}
+
+// EmitZipkinBatch implements EmitZipkinBatch() of Agent interface
+func (a *AgentClientUDP) EmitZipkinBatch(context.Context, []*zipkincore.Span) error {
+ return errors.New("Not implemented")
+}
+
+// EmitBatch implements EmitBatch() of Agent interface
+func (a *AgentClientUDP) EmitBatch(ctx context.Context, batch *jaeger.Batch) error {
+ a.thriftBuffer.Reset()
+ if err := a.client.EmitBatch(ctx, batch); err != nil {
+ return err
+ }
+ if a.thriftBuffer.Len() > a.maxPacketSize {
+ return fmt.Errorf("data does not fit within one UDP packet; size %d, max %d, spans %d",
+ a.thriftBuffer.Len(), a.maxPacketSize, len(batch.Spans))
+ }
+ _, err := a.connUDP.Write(a.thriftBuffer.Bytes())
+ return err
+}
+
+// Close implements Close() of io.Closer and closes the underlying UDP connection.
+func (a *AgentClientUDP) Close() error {
+ return a.connUDP.Close()
+}