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client.go
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client.go
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// 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 client
import (
"fmt"
"net"
"net/http"
"sync"
"github.com/crossdock/crossdock-go"
"github.com/uber/jaeger-client-go/crossdock/common"
)
// Client is a controller for the tests
type Client struct {
ClientHostPort string
ServerPortHTTP string
listener net.Listener
hostMapper func(service string) string
}
// Start begins a blocking Crossdock client
func (c *Client) Start() error {
if err := c.Listen(); err != nil {
return err
}
return c.Serve()
}
// AsyncStart begins a Crossdock client in the background,
// but does not return until it started serving.
func (c *Client) AsyncStart() error {
if err := c.Listen(); err != nil {
return err
}
var started sync.WaitGroup
started.Add(1)
go func() {
started.Done()
c.Serve()
}()
started.Wait()
return nil
}
// Listen initializes the server
func (c *Client) Listen() error {
c.setDefaultPort(&c.ClientHostPort, ":"+common.DefaultClientPortHTTP)
c.setDefaultPort(&c.ServerPortHTTP, common.DefaultServerPortHTTP)
behaviors := crossdock.Behaviors{
behaviorTrace: c.trace,
}
http.Handle("/", crossdock.Handler(behaviors, true))
listener, err := net.Listen("tcp", c.ClientHostPort)
if err != nil {
return err
}
c.listener = listener
c.ClientHostPort = listener.Addr().String()
return nil
}
// Serve starts service crossdock traffic. This is a blocking call.
func (c *Client) Serve() error {
return http.Serve(c.listener, nil)
}
// Close stops the client
func (c *Client) Close() error {
return c.listener.Close()
}
// URL returns a URL that the client can be accessed on
func (c *Client) URL() string {
return fmt.Sprintf("http://%s/", c.ClientHostPort)
}
func (c *Client) setDefaultPort(port *string, defaultPort string) {
if *port == "" {
*port = defaultPort
}
}
func (c *Client) mapServiceToHost(service string) string {
mapper := c.hostMapper
if mapper == nil {
return service
}
return mapper(service)
}