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test_helper.go
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test_helper.go
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package testutil
import (
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
log "github.com/sirupsen/logrus"
)
// TestHelper provides helpers for running the linkerd integration tests.
type TestHelper struct {
linkerd string
version string
namespace string
tls bool
httpClient http.Client
KubernetesHelper
}
// NewTestHelper creates a new instance of TestHelper for the current test run.
// The new TestHelper can be configured via command line flags.
func NewTestHelper() *TestHelper {
exit := func(code int, msg string) {
fmt.Fprintln(os.Stderr, msg)
os.Exit(code)
}
linkerd := flag.String("linkerd", "", "path to the linkerd binary to test")
namespace := flag.String("linkerd-namespace", "linkerd", "the namespace where linkerd is installed")
tls := flag.Bool("enable-tls", false, "enable TLS in tests")
runTests := flag.Bool("integration-tests", false, "must be provided to run the integration tests")
verbose := flag.Bool("verbose", false, "turn on debug logging")
flag.Parse()
if !*runTests {
exit(0, "integration tests not enabled: enable with -integration-tests")
}
if *linkerd == "" {
exit(1, "-linkerd flag is required")
}
if !filepath.IsAbs(*linkerd) {
exit(1, "-linkerd path must be absolute")
}
_, err := os.Stat(*linkerd)
if err != nil {
exit(1, "-linkerd binary does not exist")
}
if *verbose {
log.SetLevel(log.DebugLevel)
} else {
log.SetLevel(log.PanicLevel)
}
ns := *namespace
if *tls {
ns += "-tls"
}
testHelper := &TestHelper{
linkerd: *linkerd,
namespace: ns,
tls: *tls,
}
version, err := testHelper.LinkerdRun("version", "--client", "--short")
if err != nil {
exit(1, "error getting linkerd version")
}
testHelper.version = strings.TrimSpace(version)
kubernetesHelper, err := NewKubernetesHelper()
if err != nil {
exit(1, "error creating kubernetes helper: "+err.Error())
}
testHelper.KubernetesHelper = *kubernetesHelper
testHelper.httpClient = http.Client{
Timeout: 10 * time.Second,
}
return testHelper
}
// GetVersion returns the version of linkerd to test. This version corresponds
// to the client version of the linkerd binary provided via the -linkerd command
// line flag.
func (h *TestHelper) GetVersion() string {
return h.version
}
// GetLinkerdNamespace returns the namespace where linkerd is installed. Set the
// namespace using the -linkerd-namespace command line flag.
func (h *TestHelper) GetLinkerdNamespace() string {
return h.namespace
}
// GetTestNamespace returns the namespace for the given test. The test namespace
// is prefixed with the linkerd namespace.
func (h *TestHelper) GetTestNamespace(testName string) string {
return h.namespace + "-" + testName
}
// TLS returns whether or not TLS is enabled for the given test.
func (h *TestHelper) TLS() bool {
return h.tls
}
// CombinedOutput executes a shell command and returns the output.
func (h *TestHelper) CombinedOutput(name string, arg ...string) (string, error) {
command := exec.Command(name, arg...)
bytes, err := command.CombinedOutput()
if err != nil {
return string(bytes), err
}
return string(bytes), nil
}
// LinkerdRun executes a linkerd command appended with the --linkerd-namespace
// flag.
func (h *TestHelper) LinkerdRun(arg ...string) (string, error) {
withNamespace := append(arg, "--linkerd-namespace", h.namespace)
return h.CombinedOutput(h.linkerd, withNamespace...)
}
// LinkerdRunStream initiates a linkerd command appended with the
// --linkerd-namespace flag, and returns a Stream that can be used to read the
// command's output while it is still executing.
func (h *TestHelper) LinkerdRunStream(arg ...string) (*Stream, error) {
withNamespace := append(arg, "--linkerd-namespace", h.namespace)
cmd := exec.Command(h.linkerd, withNamespace...)
cmdReader, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
err = cmd.Start()
if err != nil {
return nil, err
}
time.Sleep(500 * time.Millisecond)
if cmd.ProcessState != nil && cmd.ProcessState.Exited() {
return nil, fmt.Errorf("Process exited: %s", cmd.ProcessState)
}
return &Stream{cmd: cmd, out: cmdReader}, nil
}
// ValidateOutput validates a string against the contents of a file in the
// test's testdata directory.
func (h *TestHelper) ValidateOutput(out, fixtureFile string) error {
b, err := ioutil.ReadFile("testdata/" + fixtureFile)
if err != nil {
return err
}
expected := string(b)
if out != expected {
return fmt.Errorf(
"Expected:\n%s\nActual:\n%s", expected, out)
}
return nil
}
// CheckVersion validates the the output of the "linkerd version" command.
func (h *TestHelper) CheckVersion(serverVersion string) error {
out, err := h.LinkerdRun("version")
if err != nil {
return fmt.Errorf("Unexpected error: %s\n%s", err.Error(), out)
}
if !strings.Contains(out, fmt.Sprintf("Client version: %s", h.version)) {
return fmt.Errorf("Expected client version [%s], got:\n%s", h.version, out)
}
if !strings.Contains(out, fmt.Sprintf("Server version: %s", serverVersion)) {
return fmt.Errorf("Expected server version [%s], got:\n%s", serverVersion, out)
}
return nil
}
// RetryFor retries a given function every second until the function returns
// without an error, or a timeout is reached. If the timeout is reached, it
// returns the last error received from the function.
func (h *TestHelper) RetryFor(timeout time.Duration, fn func() error) error {
err := fn()
if err == nil {
return nil
}
timeoutAfter := time.After(timeout)
retryAfter := time.Tick(time.Second)
for {
select {
case <-timeoutAfter:
return err
case <-retryAfter:
err = fn()
if err == nil {
return nil
}
}
}
}
// HTTPGetURL sends a GET request to the given URL. It returns the response body
// in the event of a successful 200 response. In the event of a non-200
// response, it returns an error. It retries requests for up to 30 seconds,
// giving pods time to start.
func (h *TestHelper) HTTPGetURL(url string) (string, error) {
var body string
err := h.RetryFor(30*time.Second, func() error {
resp, err := h.httpClient.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("Error reading response body: %v", err)
}
body = string(bytes)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("GET request to [%s] returned status [%d]\n%s", url, resp.StatusCode, body)
}
return nil
})
return body, err
}