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thrift_processor.go
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thrift_processor.go
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// Copyright (c) 2019 The Jaeger Authors.
// 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 processors
import (
"context"
"fmt"
"sync"
"github.com/apache/thrift/lib/go/thrift"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/cmd/agent/app/customtransport"
"github.com/jaegertracing/jaeger/cmd/agent/app/servers"
"github.com/jaegertracing/jaeger/pkg/metrics"
)
// ThriftProcessor is a server that processes spans using a TBuffered Server
type ThriftProcessor struct {
server servers.Server
handler AgentProcessor
protocolPool *sync.Pool
numProcessors int
processing sync.WaitGroup
logger *zap.Logger
metrics struct {
// Amount of time taken for processor to close
ProcessorCloseTimer metrics.Timer `metric:"thrift.udp.t-processor.close-time"`
// Number of failed buffer process operations
HandlerProcessError metrics.Counter `metric:"thrift.udp.t-processor.handler-errors"`
}
}
// AgentProcessor handler used by the processor to process thrift and call the reporter
// with the deserialized struct. This interface is implemented directly by Thrift generated
// code, e.g. jaegerThrift.NewAgentProcessor(handler), where handler implements the Agent
// Thrift service interface, which is invoked with the deserialized struct.
type AgentProcessor interface {
Process(ctx context.Context, iprot, oprot thrift.TProtocol) (success bool, err thrift.TException)
}
// NewThriftProcessor creates a TBufferedServer backed ThriftProcessor
func NewThriftProcessor(
server servers.Server,
numProcessors int,
mFactory metrics.Factory,
factory thrift.TProtocolFactory,
handler AgentProcessor,
logger *zap.Logger,
) (*ThriftProcessor, error) {
if numProcessors <= 0 {
return nil, fmt.Errorf(
"number of processors must be greater than 0, called with %d", numProcessors)
}
protocolPool := &sync.Pool{
New: func() interface{} {
trans := &customtransport.TBufferedReadTransport{}
return factory.GetProtocol(trans)
},
}
res := &ThriftProcessor{
server: server,
handler: handler,
protocolPool: protocolPool,
logger: logger,
numProcessors: numProcessors,
}
metrics.Init(&res.metrics, mFactory, nil)
res.processing.Add(res.numProcessors)
for i := 0; i < res.numProcessors; i++ {
go func() {
res.processBuffer()
res.processing.Done()
}()
}
return res, nil
}
// Serve starts serving traffic
func (s *ThriftProcessor) Serve() {
s.server.Serve()
}
// IsServing indicates whether the server is currently serving traffic
func (s *ThriftProcessor) IsServing() bool {
return s.server.IsServing()
}
// Stop stops the serving of traffic and waits until the queue is
// emptied by the readers
func (s *ThriftProcessor) Stop() {
stopwatch := metrics.StartStopwatch(s.metrics.ProcessorCloseTimer)
s.server.Stop()
s.processing.Wait()
stopwatch.Stop()
}
// processBuffer reads data off the channel and puts it into a custom transport for
// the processor to process
func (s *ThriftProcessor) processBuffer() {
for readBuf := range s.server.DataChan() {
protocol := s.protocolPool.Get().(thrift.TProtocol)
payload := readBuf.GetBytes()
protocol.Transport().Write(payload)
s.logger.Debug("Span(s) received by the agent", zap.Int("bytes-received", len(payload)))
// NB: oddly, thrift-gen/agent/agent.go:L156 does this: `return true, thrift.WrapTException(err2)`
// So we check for both OK and error.
if ok, err := s.handler.Process(context.Background(), protocol, protocol); !ok || err != nil {
s.logger.Error("Processor failed", zap.Error(err))
s.metrics.HandlerProcessError.Inc(1)
}
s.protocolPool.Put(protocol)
s.server.DataRecd(readBuf) // acknowledge receipt and release the buffer
}
}