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runner.go
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runner.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
package test
import (
"bytes"
"errors"
"fmt"
"io"
"net/http"
"strconv"
"testing"
"time"
"github.com/tinylib/msgp/msgp"
pb "github.com/DataDog/datadog-agent/pkg/proto/pbgo/trace"
)
// ErrNotStarted is returned when attempting to operate an unstarted Runner.
var ErrNotStarted = errors.New("runner: not started")
// Runner can start an agent instance using a custom configuration, send payloads
// to it and act as a fake backend. Call Start first to initiate the fake backend,
// then RunAgent to start agent instances. Post may be used to send payloads to the
// agent and Out to receive its output.
type Runner struct {
// Verbose will make the runner output more verbose, more specifically
// around operations regarding the trace-agent process.
Verbose bool
// ChannelSize specifies the size of the payload buffer of the fake backend.
// If reached, HTTP handlers will block until payloads are received from
// the out channel. It defaults to 100.
ChannelSize int
agent *agentRunner
backend *fakeBackend
}
// Start initializes the runner and starts the fake backend.
func (s *Runner) Start() error {
s.backend = newFakeBackend(s.ChannelSize)
if !s.Verbose {
// respect whatever the testing framework says
s.Verbose = testing.Verbose()
}
agent, err := newAgentRunner(s.backend.srv.Addr, s.Verbose)
if err != nil {
return err
}
s.agent = agent
return s.backend.Start()
}
// Shutdown stops any running agent and shuts down the fake backend.
func (s *Runner) Shutdown(wait time.Duration) error {
if s.agent == nil || s.backend == nil {
return ErrNotStarted
}
s.agent.cleanup() //nolint:errcheck
if err := s.backend.Shutdown(wait); err != nil {
return err
}
s.agent = nil
s.backend = nil
return nil
}
// RunAgent starts an agent instance using the given YAML configuration.
func (s *Runner) RunAgent(conf []byte) error {
if s.agent == nil {
return ErrNotStarted
}
return s.agent.Run(conf)
}
// AgentLog returns up to 1MB of tail from the trace agent log.
func (s *Runner) AgentLog() string {
if s.agent == nil {
return ""
}
return s.agent.Log()
}
// KillAgent kills any agent that was started by this runner.
func (s *Runner) KillAgent() {
if s.agent == nil {
return
}
s.agent.Kill()
}
// Out returns a channel which will provide payloads received by the fake backend.
// They can be of type pb.AgentPayload or agent.StatsPayload.
func (s *Runner) Out() <-chan interface{} {
if s.backend == nil {
closedCh := make(chan interface{})
close(closedCh)
return closedCh
}
return s.backend.Out()
}
// PostMsgpack encodes data using msgpack and posts it to the given path. The agent
// must be started using RunAgent.
//
// Example: r.PostMsgpack("/v0.5/stats", pb.ClientStatsPayload{})
func (s *Runner) PostMsgpack(path string, data msgp.Marshaler) (err error) {
if s.agent == nil {
return ErrNotStarted
}
if s.agent.PID() == 0 {
return errors.New("post: trace-agent not running")
}
var b []byte
if b, err = data.MarshalMsg(nil); err != nil {
return err
}
buf := bytes.NewBuffer(b)
addr := fmt.Sprintf("http://%s%s", s.agent.Addr(), path)
req, err := http.NewRequest("POST", addr, buf)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/msgpack")
req.Header.Set("Content-Length", strconv.Itoa(buf.Len()))
req.Header.Set("Datadog-Meta-Tracer-Version", "0.2.0")
req.Header.Set("Datadog-Meta-Lang", "go")
return s.doRequest(req)
}
// Post posts the given list of traces to the trace agent. Before posting, agent must
// be started. You can start an agent using RunAgent.
func (s *Runner) Post(traceList pb.Traces) error {
if s.agent == nil {
return ErrNotStarted
}
if s.agent.PID() == 0 {
return errors.New("post: trace-agent not running")
}
bts, err := traceList.MarshalMsg(nil)
if err != nil {
return err
}
addr := fmt.Sprintf("http://%s/v0.4/traces", s.agent.Addr())
req, err := http.NewRequest("POST", addr, bytes.NewReader(bts))
if err != nil {
return err
}
req.Header.Set("X-Datadog-Trace-Count", strconv.Itoa(len(traceList)))
req.Header.Set("Content-Type", "application/msgpack")
req.Header.Set("Content-Length", strconv.Itoa(len(bts)))
return s.doRequest(req)
}
// DoReq posts the given payload to the trace agent and posts it to the given path.
// Before posting, agent must be started. You can start an agent using RunAgent.
func (s *Runner) DoReq(url, method string, payload []byte) (*http.Response, error) {
if s.agent == nil {
return nil, ErrNotStarted
}
if s.agent.PID() == 0 {
return nil, errors.New("post: trace-agent not running")
}
addr := fmt.Sprintf("http://%s/%s", s.agent.Addr(), url)
req, err := http.NewRequest(method, addr, bytes.NewReader(payload))
if err != nil {
return nil, err
}
req.Header.Set("Content-Length", strconv.Itoa(len(payload)))
return http.DefaultClient.Do(req)
}
func (s *Runner) doRequest(req *http.Request) error {
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
slurp, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("%s (error reading response body: %v)", resp.Status, err)
}
return fmt.Errorf("%s: %s", resp.Status, slurp)
}
return nil
}