mirror of https://github.com/poanetwork/quorum.git
132 lines
4.1 KiB
Go
132 lines
4.1 KiB
Go
|
// 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 jaeger
|
||
|
|
||
|
import (
|
||
|
"errors"
|
||
|
"fmt"
|
||
|
|
||
|
"github.com/uber/jaeger-client-go/thrift"
|
||
|
|
||
|
j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
|
||
|
"github.com/uber/jaeger-client-go/utils"
|
||
|
)
|
||
|
|
||
|
// Empirically obtained constant for how many bytes in the message are used for envelope.
|
||
|
// The total datagram size is:
|
||
|
// sizeof(Span) * numSpans + processByteSize + emitBatchOverhead <= maxPacketSize
|
||
|
// There is a unit test `TestEmitBatchOverhead` that validates this number.
|
||
|
// Note that due to the use of Compact Thrift protocol, overhead grows with the number of spans
|
||
|
// in the batch, because the length of the list is encoded as varint32, as well as SeqId.
|
||
|
const emitBatchOverhead = 30
|
||
|
|
||
|
var errSpanTooLarge = errors.New("Span is too large")
|
||
|
|
||
|
type udpSender struct {
|
||
|
client *utils.AgentClientUDP
|
||
|
maxPacketSize int // max size of datagram in bytes
|
||
|
maxSpanBytes int // max number of bytes to record spans (excluding envelope) in the datagram
|
||
|
byteBufferSize int // current number of span bytes accumulated in the buffer
|
||
|
spanBuffer []*j.Span // spans buffered before a flush
|
||
|
thriftBuffer *thrift.TMemoryBuffer // buffer used to calculate byte size of a span
|
||
|
thriftProtocol thrift.TProtocol
|
||
|
process *j.Process
|
||
|
processByteSize int
|
||
|
}
|
||
|
|
||
|
// NewUDPTransport creates a reporter that submits spans to jaeger-agent
|
||
|
func NewUDPTransport(hostPort string, maxPacketSize int) (Transport, error) {
|
||
|
if len(hostPort) == 0 {
|
||
|
hostPort = fmt.Sprintf("%s:%d", DefaultUDPSpanServerHost, DefaultUDPSpanServerPort)
|
||
|
}
|
||
|
if maxPacketSize == 0 {
|
||
|
maxPacketSize = utils.UDPPacketMaxLength
|
||
|
}
|
||
|
|
||
|
protocolFactory := thrift.NewTCompactProtocolFactory()
|
||
|
|
||
|
// Each span is first written to thriftBuffer to determine its size in bytes.
|
||
|
thriftBuffer := thrift.NewTMemoryBufferLen(maxPacketSize)
|
||
|
thriftProtocol := protocolFactory.GetProtocol(thriftBuffer)
|
||
|
|
||
|
client, err := utils.NewAgentClientUDP(hostPort, maxPacketSize)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
sender := &udpSender{
|
||
|
client: client,
|
||
|
maxSpanBytes: maxPacketSize - emitBatchOverhead,
|
||
|
thriftBuffer: thriftBuffer,
|
||
|
thriftProtocol: thriftProtocol}
|
||
|
return sender, nil
|
||
|
}
|
||
|
|
||
|
func (s *udpSender) calcSizeOfSerializedThrift(thriftStruct thrift.TStruct) int {
|
||
|
s.thriftBuffer.Reset()
|
||
|
thriftStruct.Write(s.thriftProtocol)
|
||
|
return s.thriftBuffer.Len()
|
||
|
}
|
||
|
|
||
|
func (s *udpSender) Append(span *Span) (int, error) {
|
||
|
if s.process == nil {
|
||
|
s.process = BuildJaegerProcessThrift(span)
|
||
|
s.processByteSize = s.calcSizeOfSerializedThrift(s.process)
|
||
|
s.byteBufferSize += s.processByteSize
|
||
|
}
|
||
|
jSpan := BuildJaegerThrift(span)
|
||
|
spanSize := s.calcSizeOfSerializedThrift(jSpan)
|
||
|
if spanSize > s.maxSpanBytes {
|
||
|
return 1, errSpanTooLarge
|
||
|
}
|
||
|
|
||
|
s.byteBufferSize += spanSize
|
||
|
if s.byteBufferSize <= s.maxSpanBytes {
|
||
|
s.spanBuffer = append(s.spanBuffer, jSpan)
|
||
|
if s.byteBufferSize < s.maxSpanBytes {
|
||
|
return 0, nil
|
||
|
}
|
||
|
return s.Flush()
|
||
|
}
|
||
|
// the latest span did not fit in the buffer
|
||
|
n, err := s.Flush()
|
||
|
s.spanBuffer = append(s.spanBuffer, jSpan)
|
||
|
s.byteBufferSize = spanSize + s.processByteSize
|
||
|
return n, err
|
||
|
}
|
||
|
|
||
|
func (s *udpSender) Flush() (int, error) {
|
||
|
n := len(s.spanBuffer)
|
||
|
if n == 0 {
|
||
|
return 0, nil
|
||
|
}
|
||
|
err := s.client.EmitBatch(&j.Batch{Process: s.process, Spans: s.spanBuffer})
|
||
|
s.resetBuffers()
|
||
|
|
||
|
return n, err
|
||
|
}
|
||
|
|
||
|
func (s *udpSender) Close() error {
|
||
|
return s.client.Close()
|
||
|
}
|
||
|
|
||
|
func (s *udpSender) resetBuffers() {
|
||
|
for i := range s.spanBuffer {
|
||
|
s.spanBuffer[i] = nil
|
||
|
}
|
||
|
s.spanBuffer = s.spanBuffer[:0]
|
||
|
s.byteBufferSize = s.processByteSize
|
||
|
}
|