104 lines
3.6 KiB
Go
104 lines
3.6 KiB
Go
// Copyright (c) 2016 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package utils
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"github.com/apache/thrift/lib/go/thrift"
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"github.com/uber/jaeger-client-go/thrift-gen/agent"
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"github.com/uber/jaeger-client-go/thrift-gen/jaeger"
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"github.com/uber/jaeger-client-go/thrift-gen/zipkincore"
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)
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// UDPPacketMaxLength is the max size of UDP packet we want to send, synced with jaeger-agent
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const UDPPacketMaxLength = 65000
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// AgentClientUDP is a UDP client to Jaeger agent that implements agent.Agent interface.
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type AgentClientUDP struct {
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agent.Agent
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io.Closer
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connUDP *net.UDPConn
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client *agent.AgentClient
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maxPacketSize int // max size of datagram in bytes
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thriftBuffer *thrift.TMemoryBuffer // buffer used to calculate byte size of a span
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}
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// NewAgentClientUDP creates a client that sends spans to Jaeger Agent over UDP.
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func NewAgentClientUDP(hostPort string, maxPacketSize int) (*AgentClientUDP, error) {
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if maxPacketSize == 0 {
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maxPacketSize = UDPPacketMaxLength
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}
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thriftBuffer := thrift.NewTMemoryBufferLen(maxPacketSize)
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protocolFactory := thrift.NewTCompactProtocolFactory()
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client := agent.NewAgentClientFactory(thriftBuffer, protocolFactory)
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destAddr, err := net.ResolveUDPAddr("udp", hostPort)
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if err != nil {
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return nil, err
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}
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connUDP, err := net.DialUDP(destAddr.Network(), nil, destAddr)
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if err != nil {
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return nil, err
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}
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if err := connUDP.SetWriteBuffer(maxPacketSize); err != nil {
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return nil, err
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}
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clientUDP := &AgentClientUDP{
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connUDP: connUDP,
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client: client,
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maxPacketSize: maxPacketSize,
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thriftBuffer: thriftBuffer}
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return clientUDP, nil
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}
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// EmitZipkinBatch implements EmitZipkinBatch() of Agent interface
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func (a *AgentClientUDP) EmitZipkinBatch(spans []*zipkincore.Span) error {
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return errors.New("Not implemented")
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}
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// EmitBatch implements EmitBatch() of Agent interface
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func (a *AgentClientUDP) EmitBatch(batch *jaeger.Batch) error {
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a.thriftBuffer.Reset()
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a.client.SeqId = 0 // we have no need for distinct SeqIds for our one-way UDP messages
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if err := a.client.EmitBatch(batch); err != nil {
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return err
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}
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if a.thriftBuffer.Len() > a.maxPacketSize {
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return fmt.Errorf("Data does not fit within one UDP packet; size %d, max %d, spans %d",
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a.thriftBuffer.Len(), a.maxPacketSize, len(batch.Spans))
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}
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_, err := a.connUDP.Write(a.thriftBuffer.Bytes())
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return err
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}
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// Close implements Close() of io.Closer and closes the underlying UDP connection.
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func (a *AgentClientUDP) Close() error {
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return a.connUDP.Close()
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}
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