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simple_server.go
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simple_server.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 thrift
import (
"log"
"runtime/debug"
"sync"
"sync/atomic"
)
/*
* This is not a typical TSimpleServer as it is not blocked after accept a socket.
* It is more like a TThreadedServer that can handle different connections in different goroutines.
* This will work if golang user implements a conn-pool like thing in client side.
*/
type TSimpleServer struct {
closed int32
wg sync.WaitGroup
mu sync.Mutex
processorFactory TProcessorFactory
serverTransport TServerTransport
inputTransportFactory TTransportFactory
outputTransportFactory TTransportFactory
inputProtocolFactory TProtocolFactory
outputProtocolFactory TProtocolFactory
// Headers to auto forward in THeaderProtocol
forwardHeaders []string
}
func NewTSimpleServer2(processor TProcessor, serverTransport TServerTransport) *TSimpleServer {
return NewTSimpleServerFactory2(NewTProcessorFactory(processor), serverTransport)
}
func NewTSimpleServer4(processor TProcessor, serverTransport TServerTransport, transportFactory TTransportFactory, protocolFactory TProtocolFactory) *TSimpleServer {
return NewTSimpleServerFactory4(NewTProcessorFactory(processor),
serverTransport,
transportFactory,
protocolFactory,
)
}
func NewTSimpleServer6(processor TProcessor, serverTransport TServerTransport, inputTransportFactory TTransportFactory, outputTransportFactory TTransportFactory, inputProtocolFactory TProtocolFactory, outputProtocolFactory TProtocolFactory) *TSimpleServer {
return NewTSimpleServerFactory6(NewTProcessorFactory(processor),
serverTransport,
inputTransportFactory,
outputTransportFactory,
inputProtocolFactory,
outputProtocolFactory,
)
}
func NewTSimpleServerFactory2(processorFactory TProcessorFactory, serverTransport TServerTransport) *TSimpleServer {
return NewTSimpleServerFactory6(processorFactory,
serverTransport,
NewTTransportFactory(),
NewTTransportFactory(),
NewTBinaryProtocolFactoryDefault(),
NewTBinaryProtocolFactoryDefault(),
)
}
func NewTSimpleServerFactory4(processorFactory TProcessorFactory, serverTransport TServerTransport, transportFactory TTransportFactory, protocolFactory TProtocolFactory) *TSimpleServer {
return NewTSimpleServerFactory6(processorFactory,
serverTransport,
transportFactory,
transportFactory,
protocolFactory,
protocolFactory,
)
}
func NewTSimpleServerFactory6(processorFactory TProcessorFactory, serverTransport TServerTransport, inputTransportFactory TTransportFactory, outputTransportFactory TTransportFactory, inputProtocolFactory TProtocolFactory, outputProtocolFactory TProtocolFactory) *TSimpleServer {
return &TSimpleServer{
processorFactory: processorFactory,
serverTransport: serverTransport,
inputTransportFactory: inputTransportFactory,
outputTransportFactory: outputTransportFactory,
inputProtocolFactory: inputProtocolFactory,
outputProtocolFactory: outputProtocolFactory,
}
}
func (p *TSimpleServer) ProcessorFactory() TProcessorFactory {
return p.processorFactory
}
func (p *TSimpleServer) ServerTransport() TServerTransport {
return p.serverTransport
}
func (p *TSimpleServer) InputTransportFactory() TTransportFactory {
return p.inputTransportFactory
}
func (p *TSimpleServer) OutputTransportFactory() TTransportFactory {
return p.outputTransportFactory
}
func (p *TSimpleServer) InputProtocolFactory() TProtocolFactory {
return p.inputProtocolFactory
}
func (p *TSimpleServer) OutputProtocolFactory() TProtocolFactory {
return p.outputProtocolFactory
}
func (p *TSimpleServer) Listen() error {
return p.serverTransport.Listen()
}
// SetForwardHeaders sets the list of header keys that will be auto forwarded
// while using THeaderProtocol.
//
// "forward" means that when the server is also a client to other upstream
// thrift servers, the context object user gets in the processor functions will
// have both read and write headers set, with write headers being forwarded.
// Users can always override the write headers by calling SetWriteHeaderList
// before calling thrift client functions.
func (p *TSimpleServer) SetForwardHeaders(headers []string) {
size := len(headers)
if size == 0 {
p.forwardHeaders = nil
return
}
keys := make([]string, size)
copy(keys, headers)
p.forwardHeaders = keys
}
func (p *TSimpleServer) innerAccept() (int32, error) {
client, err := p.serverTransport.Accept()
p.mu.Lock()
defer p.mu.Unlock()
closed := atomic.LoadInt32(&p.closed)
if closed != 0 {
return closed, nil
}
if err != nil {
return 0, err
}
if client != nil {
p.wg.Add(1)
go func() {
defer p.wg.Done()
if err := p.processRequests(client); err != nil {
log.Println("error processing request:", err)
}
}()
}
return 0, nil
}
func (p *TSimpleServer) AcceptLoop() error {
for {
closed, err := p.innerAccept()
if err != nil {
return err
}
if closed != 0 {
return nil
}
}
}
func (p *TSimpleServer) Serve() error {
err := p.Listen()
if err != nil {
return err
}
p.AcceptLoop()
return nil
}
func (p *TSimpleServer) Stop() error {
p.mu.Lock()
defer p.mu.Unlock()
if atomic.LoadInt32(&p.closed) != 0 {
return nil
}
atomic.StoreInt32(&p.closed, 1)
p.serverTransport.Interrupt()
p.wg.Wait()
return nil
}
func (p *TSimpleServer) processRequests(client TTransport) error {
processor := p.processorFactory.GetProcessor(client)
inputTransport, err := p.inputTransportFactory.GetTransport(client)
if err != nil {
return err
}
inputProtocol := p.inputProtocolFactory.GetProtocol(inputTransport)
var outputTransport TTransport
var outputProtocol TProtocol
// for THeaderProtocol, we must use the same protocol instance for
// input and output so that the response is in the same dialect that
// the server detected the request was in.
headerProtocol, ok := inputProtocol.(*THeaderProtocol)
if ok {
outputProtocol = inputProtocol
} else {
oTrans, err := p.outputTransportFactory.GetTransport(client)
if err != nil {
return err
}
outputTransport = oTrans
outputProtocol = p.outputProtocolFactory.GetProtocol(outputTransport)
}
defer func() {
if e := recover(); e != nil {
log.Printf("panic in processor: %s: %s", e, debug.Stack())
}
}()
if inputTransport != nil {
defer inputTransport.Close()
}
if outputTransport != nil {
defer outputTransport.Close()
}
for {
if atomic.LoadInt32(&p.closed) != 0 {
return nil
}
ctx := defaultCtx
if headerProtocol != nil {
// We need to call ReadFrame here, otherwise we won't
// get any headers on the AddReadTHeaderToContext call.
//
// ReadFrame is safe to be called multiple times so it
// won't break when it's called again later when we
// actually start to read the message.
if err := headerProtocol.ReadFrame(); err != nil {
return err
}
ctx = AddReadTHeaderToContext(defaultCtx, headerProtocol.GetReadHeaders())
ctx = SetWriteHeaderList(ctx, p.forwardHeaders)
}
ok, err := processor.Process(ctx, inputProtocol, outputProtocol)
if err, ok := err.(TTransportException); ok && err.TypeId() == END_OF_FILE {
return nil
} else if err != nil {
return err
}
if err, ok := err.(TApplicationException); ok && err.TypeId() == UNKNOWN_METHOD {
continue
}
if !ok {
break
}
}
return nil
}