traefik/integration/healthcheck_test.go

package main

import (
	"bytes"
	"net/http"
	"os"
	"os/exec"
	"time"

	"github.com/containous/traefik/integration/try"
	"github.com/go-check/check"
	checker "github.com/vdemeester/shakers"
)

// HealthCheck test suites (using libcompose)
type HealthCheckSuite struct{ BaseSuite }

func (s *HealthCheckSuite) SetUpSuite(c *check.C) {
	s.createComposeProject(c, "healthcheck")
	s.composeProject.Start(c)
}

func (s *HealthCheckSuite) TestSimpleConfiguration(c *check.C) {

	whoami1Host := s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress
	whoami2Host := s.composeProject.Container(c, "whoami2").NetworkSettings.IPAddress

	file := s.adaptFile(c, "fixtures/healthcheck/simple.toml", struct {
		Server1 string
		Server2 string
	}{whoami1Host, whoami2Host})
	defer os.Remove(file)
	cmd := exec.Command(traefikBinary, "--configFile="+file)

	err := cmd.Start()
	c.Assert(err, checker.IsNil)
	defer cmd.Process.Kill()

	// wait for traefik
	err = try.GetRequest("http://127.0.0.1:8080/api/providers", 60*time.Second, try.BodyContains("Host:test.localhost"))
	c.Assert(err, checker.IsNil)

	frontendHealthReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000/health", nil)
	c.Assert(err, checker.IsNil)
	frontendHealthReq.Host = "test.localhost"

	err = try.Request(frontendHealthReq, 500*time.Millisecond, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	// Fix all whoami health to 500
	client := &http.Client{}
	whoamiHosts := []string{whoami1Host, whoami2Host}
	for _, whoami := range whoamiHosts {
		statusInternalServerErrorReq, err := http.NewRequest(http.MethodPost, "http://"+whoami+"/health", bytes.NewBuffer([]byte("500")))
		c.Assert(err, checker.IsNil)
		_, err = client.Do(statusInternalServerErrorReq)
		c.Assert(err, checker.IsNil)
	}

	// Waiting for Traefik healthcheck
	try.Sleep(2 * time.Second)

	// Verify frontend health : 500
	err = try.Request(frontendHealthReq, 3*time.Second, try.StatusCodeIs(http.StatusInternalServerError))
	c.Assert(err, checker.IsNil)

	// Change one whoami health to 200
	statusOKReq1, err := http.NewRequest(http.MethodPost, "http://"+whoami1Host+"/health", bytes.NewBuffer([]byte("200")))
	c.Assert(err, checker.IsNil)
	_, err = client.Do(statusOKReq1)
	c.Assert(err, checker.IsNil)

	// Verify frontend health : after
	err = try.Request(frontendHealthReq, 3*time.Second, try.StatusCodeIs(http.StatusOK))
	c.Assert(err, checker.IsNil)

	frontendReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000/", nil)
	c.Assert(err, checker.IsNil)
	frontendReq.Host = "test.localhost"

	// Check if whoami1 respond
	err = try.Request(frontendReq, 500*time.Millisecond, try.BodyContains(whoami1Host))
	c.Assert(err, checker.IsNil)

	// Check if the service with bad health check (whoami2) never respond.
	err = try.Request(frontendReq, 2*time.Second, try.BodyContains(whoami2Host))
	c.Assert(err, checker.Not(checker.IsNil))

	// TODO validate : run on 80
	resp, err := http.Get("http://127.0.0.1:8000/")

	// Expected a 404 as we did not configure anything
	c.Assert(err, checker.IsNil)
	c.Assert(resp.StatusCode, checker.Equals, http.StatusNotFound)
}