mirror of
https://github.com/Luzifer/nginx-sso.git
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89 lines
2.7 KiB
Go
89 lines
2.7 KiB
Go
// Copyright 2018, OpenCensus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package jaeger
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import (
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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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gen "go.opencensus.io/exporter/jaeger/internal/gen-go/jaeger"
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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 gen.Agent interface.
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type agentClientUDP struct {
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gen.Agent
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io.Closer
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connUDP *net.UDPConn
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client *gen.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 := gen.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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// EmitBatch implements EmitBatch() of Agent interface
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func (a *agentClientUDP) EmitBatch(batch *gen.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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