[VOL-3142] Update dependency of voltha-lib-go to include log package registration fix
Change-Id: I36890c7aa685e46721b481d5c965f9c0bc86934c
diff --git a/vendor/github.com/uber/jaeger-client-go/transport_udp.go b/vendor/github.com/uber/jaeger-client-go/transport_udp.go
new file mode 100644
index 0000000..7370d80
--- /dev/null
+++ b/vendor/github.com/uber/jaeger-client-go/transport_udp.go
@@ -0,0 +1,170 @@
+// 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/internal/reporterstats"
+ "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
+//
+// 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.
+//
+// There is a unit test `TestEmitBatchOverhead` that validates this number, it fails at <68.
+const emitBatchOverhead = 70
+
+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
+
+ // reporterStats provides access to stats that are only known to Reporter
+ reporterStats reporterstats.ReporterStats
+
+ // The following counters are always non-negative, but we need to send them in signed i64 Thrift fields,
+ // so we keep them as signed. At 10k QPS, overflow happens in about 300 million years.
+ batchSeqNo int64
+ tooLargeDroppedSpans int64
+ failedToEmitSpans int64
+}
+
+// NewUDPTransport creates a reporter that submits spans to jaeger-agent.
+// TODO: (breaking change) move to transport/ package.
+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
+ }
+
+ return &udpSender{
+ client: client,
+ maxSpanBytes: maxPacketSize - emitBatchOverhead,
+ thriftBuffer: thriftBuffer,
+ thriftProtocol: thriftProtocol,
+ }, nil
+}
+
+// SetReporterStats implements reporterstats.Receiver.
+func (s *udpSender) SetReporterStats(rs reporterstats.ReporterStats) {
+ s.reporterStats = rs
+}
+
+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 {
+ s.tooLargeDroppedSpans++
+ 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
+ }
+ s.batchSeqNo++
+ batchSeqNo := int64(s.batchSeqNo)
+ err := s.client.EmitBatch(&j.Batch{
+ Process: s.process,
+ Spans: s.spanBuffer,
+ SeqNo: &batchSeqNo,
+ Stats: s.makeStats(),
+ })
+ s.resetBuffers()
+ if err != nil {
+ s.failedToEmitSpans += int64(n)
+ }
+ 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
+}
+
+func (s *udpSender) makeStats() *j.ClientStats {
+ var dropped int64
+ if s.reporterStats != nil {
+ dropped = s.reporterStats.SpansDroppedFromQueue()
+ }
+ return &j.ClientStats{
+ FullQueueDroppedSpans: dropped,
+ TooLargeDroppedSpans: s.tooLargeDroppedSpans,
+ FailedToEmitSpans: s.failedToEmitSpans,
+ }
+}