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test_tchannel_backend.go
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test_tchannel_backend.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package testbackend
import (
"context"
"net"
"os"
"strconv"
"github.com/uber-go/tally"
"github.com/uber/tchannel-go"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/uber/zanzibar/config"
zanzibar "github.com/uber/zanzibar/runtime"
)
// TestTChannelBackend will pretend to be a http backend
type TestTChannelBackend struct {
Channel *tchannel.Channel
Router *zanzibar.TChannelRouter
IP string
Port int32
RealPort int32
RealAddr string
ServiceName string
}
// BuildTChannelBackends returns a map of TChannel backends based on config
func BuildTChannelBackends(
cfg map[string]interface{}, knownTChannelBackends []string, staticConfig *zanzibar.StaticConfig,
tChannelBackends []*TestTChannelBackend,
) (map[string]*TestTChannelBackend, error) {
n := len(knownTChannelBackends)
result := make(map[string]*TestTChannelBackend, n)
for clientIndex := 0; clientIndex < n; clientIndex++ {
clientID := knownTChannelBackends[clientIndex]
val, ok := cfg["clients."+clientID+".serviceName"]
var serviceName string
if !ok {
serviceName = clientID
cfg["clients."+clientID+".serviceName"] = serviceName
} else {
serviceName = val.(string)
}
cfg["clients."+clientID+".ip"] = "127.0.0.1"
cfg["clients."+clientID+".timeout"] = int64(10000)
cfg["clients."+clientID+".timeoutPerAttempt"] = int64(10000)
backend, err := CreateTChannelBackend(int32(0), serviceName)
if err != nil {
return nil, err
}
err = backend.Bootstrap()
if err != nil {
return nil, err
}
result[clientID] = backend
cfg["clients."+clientID+".port"] = int64(backend.RealPort)
initializeAlternateBackends(result, clientID, tChannelBackends, cfg, staticConfig)
}
return result, nil
}
func initializeAlternateBackends(result map[string]*TestTChannelBackend, clientID string,
backends []*TestTChannelBackend, cfg map[string]interface{}, staticConfig *zanzibar.StaticConfig) {
if backends == nil {
return
}
var altServiceDetail config.AlternateServiceDetail
staticConfig.MustGetStruct("clients."+clientID+".alternates", &altServiceDetail)
cfg["clients."+clientID+".alternates"] = &altServiceDetail
// create backends for the same client for dynamic routing
for backendIndex := 0; backendIndex < len(backends); backendIndex++ {
backend := backends[backendIndex]
altServiceDetail.ServicesDetailMap[backend.ServiceName].Port = int(backend.RealPort)
transformedClientID := clientID + ":" + strconv.Itoa(backendIndex+1)
result[transformedClientID] = backend
}
}
// Bootstrap creates a backend for testing
func (backend *TestTChannelBackend) Bootstrap() error {
addr := backend.IP + ":" + strconv.Itoa(int(backend.Port))
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
realAddr := ln.Addr().(*net.TCPAddr)
backend.RealPort = int32(realAddr.Port)
backend.RealAddr = realAddr.IP.String() + ":" + strconv.Itoa(int(backend.RealPort))
// tchannel serve does not block, connection handling is done in different goroutine
err = backend.Channel.Serve(ln)
return err
}
// Register registers tchannel server handler
func (backend *TestTChannelBackend) Register(
endpointID, handlerID, method string,
handler zanzibar.TChannelHandler,
) error {
return backend.Router.Register(zanzibar.NewTChannelEndpoint(
endpointID, handlerID, method,
handler,
))
}
// Close closes the underlying channel
func (backend *TestTChannelBackend) Close() {
backend.Channel.Close()
}
// CreateTChannelBackend creates a TChannel backend for testing
// "serviceName" is the service discovery name, not necessarily same as the thrift service name.
func CreateTChannelBackend(port int32, serviceName string) (*TestTChannelBackend, error) {
backend := &TestTChannelBackend{
IP: "127.0.0.1",
Port: port,
ServiceName: serviceName,
}
testLogger := zap.New(
zapcore.NewCore(
zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()),
os.Stdout,
zap.WarnLevel,
),
)
testLogger = testLogger.With(
zap.String("from", "test-tchannel-backend"),
zap.String("test-backend", serviceName),
)
tchannelOpts := &tchannel.ChannelOptions{
Logger: zanzibar.NewTChannelLogger(testLogger),
}
channel, err := tchannel.NewChannel(serviceName, tchannelOpts)
if err != nil {
return nil, err
}
scopeExtractor := func(ctx context.Context) map[string]string {
tags := map[string]string{}
headers := zanzibar.GetEndpointRequestHeadersFromCtx(ctx)
tags["regionname"] = headers["Regionname"]
tags["device"] = headers["Device"]
tags["deviceversion"] = headers["Deviceversion"]
return tags
}
contextExtractors := &zanzibar.ContextExtractors{
ScopeTagsExtractors: []zanzibar.ContextScopeTagsExtractor{scopeExtractor},
}
gateway := zanzibar.Gateway{
Logger: testLogger,
RootScope: tally.NoopScope,
ContextExtractor: contextExtractors,
ContextMetrics: zanzibar.NewContextMetrics(tally.NoopScope),
}
backend.Channel = channel
backend.Router = zanzibar.NewTChannelRouter(channel, &gateway)
return backend, nil
}