traefik/provider/file/file_test.go

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package file
import (
"context"
"fmt"
"io/ioutil"
"os"
"path"
"testing"
"time"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/stretchr/testify/assert"
)
func TestProvideSingleFileAndWatch(t *testing.T) {
tempDir := createTempDir(t, "testfile")
defer os.RemoveAll(tempDir)
expectedNumFrontends := 2
expectedNumBackends := 2
tempFile := createFile(t,
tempDir, "simple.toml",
createFrontendConfiguration(expectedNumFrontends),
createBackendConfiguration(expectedNumBackends))
configurationChan, signal := createConfigurationRoutine(t, &expectedNumFrontends, &expectedNumBackends)
provide(configurationChan, watch, withFile(tempFile))
// Wait for initial message to be tested
err := waitForSignal(signal, 2*time.Second, "initial config")
assert.NoError(t, err)
// Now test again with single frontend and backend
expectedNumFrontends = 1
expectedNumBackends = 1
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createFile(t,
tempDir, "simple.toml",
createFrontendConfiguration(expectedNumFrontends),
createBackendConfiguration(expectedNumBackends))
// Must fail because we don't watch the change
err = waitForSignal(signal, 2*time.Second, "single frontend and backend")
assert.NoError(t, err)
}
func TestProvideSingleFileAndNotWatch(t *testing.T) {
tempDir := createTempDir(t, "testfile")
defer os.RemoveAll(tempDir)
expectedNumFrontends := 2
expectedNumBackends := 2
tempFile := createFile(t,
tempDir, "simple.toml",
createFrontendConfiguration(expectedNumFrontends),
createBackendConfiguration(expectedNumBackends))
configurationChan, signal := createConfigurationRoutine(t, &expectedNumFrontends, &expectedNumBackends)
provide(configurationChan, withFile(tempFile))
// Wait for initial message to be tested
err := waitForSignal(signal, 2*time.Second, "initial config")
assert.NoError(t, err)
// Now test again with single frontend and backend
expectedNumFrontends = 1
expectedNumBackends = 1
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createFile(t,
tempDir, "simple.toml",
createFrontendConfiguration(expectedNumFrontends),
createBackendConfiguration(expectedNumBackends))
// Must fail because we don't watch the changes
err = waitForSignal(signal, 2*time.Second, "single frontend and backend")
assert.Error(t, err)
}
func TestProvideDirectoryAndWatch(t *testing.T) {
tempDir := createTempDir(t, "testdir")
defer os.RemoveAll(tempDir)
expectedNumFrontends := 2
expectedNumBackends := 2
tempFile1 := createRandomFile(t, tempDir, createFrontendConfiguration(expectedNumFrontends))
tempFile2 := createRandomFile(t, tempDir, createBackendConfiguration(expectedNumBackends))
configurationChan, signal := createConfigurationRoutine(t, &expectedNumFrontends, &expectedNumBackends)
provide(configurationChan, watch, withDirectory(tempDir))
// Wait for initial config message to be tested
err := waitForSignal(signal, 2*time.Second, "initial config")
assert.NoError(t, err)
// Now remove the backends file
expectedNumFrontends = 2
expectedNumBackends = 0
os.Remove(tempFile2.Name())
err = waitForSignal(signal, 2*time.Second, "remove the backends file")
assert.NoError(t, err)
// Now remove the frontends file
expectedNumFrontends = 0
expectedNumBackends = 0
os.Remove(tempFile1.Name())
err = waitForSignal(signal, 2*time.Second, "remove the frontends file")
assert.NoError(t, err)
}
func TestProvideDirectoryAndNotWatch(t *testing.T) {
tempDir := createTempDir(t, "testdir")
defer os.RemoveAll(tempDir)
expectedNumFrontends := 2
expectedNumBackends := 2
createRandomFile(t, tempDir, createFrontendConfiguration(expectedNumFrontends))
tempFile2 := createRandomFile(t, tempDir, createBackendConfiguration(expectedNumBackends))
configurationChan, signal := createConfigurationRoutine(t, &expectedNumFrontends, &expectedNumBackends)
provide(configurationChan, withDirectory(tempDir))
// Wait for initial config message to be tested
err := waitForSignal(signal, 2*time.Second, "initial config")
assert.NoError(t, err)
// Now remove the backends file
expectedNumFrontends = 2
expectedNumBackends = 0
os.Remove(tempFile2.Name())
// Must fail because we don't watch the changes
err = waitForSignal(signal, 2*time.Second, "remove the backends file")
assert.Error(t, err)
}
func createConfigurationRoutine(t *testing.T, expectedNumFrontends *int, expectedNumBackends *int) (chan types.ConfigMessage, chan interface{}) {
configurationChan := make(chan types.ConfigMessage)
signal := make(chan interface{})
safe.Go(func() {
for {
data := <-configurationChan
assert.Equal(t, "file", data.ProviderName)
assert.Len(t, data.Configuration.Frontends, *expectedNumFrontends)
assert.Len(t, data.Configuration.Backends, *expectedNumBackends)
signal <- nil
}
})
return configurationChan, signal
}
func waitForSignal(signal chan interface{}, timeout time.Duration, caseName string) error {
timer := time.NewTimer(timeout)
defer timer.Stop()
select {
case <-signal:
case <-timer.C:
return fmt.Errorf("Timed out waiting for assertions to be tested: %s", caseName)
}
return nil
}
func provide(configurationChan chan types.ConfigMessage, builders ...func(p *Provider)) {
pvd := &Provider{}
for _, builder := range builders {
builder(pvd)
}
pvd.Provide(configurationChan, safe.NewPool(context.Background()), nil)
}
func watch(pvd *Provider) {
pvd.Watch = true
}
func withDirectory(name string) func(*Provider) {
return func(pvd *Provider) {
pvd.Directory = name
}
}
func withFile(tempFile *os.File) func(*Provider) {
return func(p *Provider) {
p.Filename = tempFile.Name()
}
}
// createRandomFile Helper
func createRandomFile(t *testing.T, tempDir string, contents ...string) *os.File {
return createFile(t, tempDir, fmt.Sprintf("temp%d.toml", time.Now().UnixNano()), contents...)
}
// createFile Helper
func createFile(t *testing.T, tempDir string, name string, contents ...string) *os.File {
fileName := path.Join(tempDir, name)
tempFile, err := os.Create(fileName)
if err != nil {
t.Fatal(err)
}
for _, content := range contents {
_, err := tempFile.WriteString(content)
if err != nil {
t.Fatal(err)
}
}
err = tempFile.Close()
if err != nil {
t.Fatal(err)
}
return tempFile
}
// createTempDir Helper
func createTempDir(t *testing.T, dir string) string {
d, err := ioutil.TempDir("", dir)
if err != nil {
t.Fatal(err)
}
return d
}
// createFrontendConfiguration Helper
func createFrontendConfiguration(n int) string {
conf := "[frontends]\n"
for i := 1; i <= n; i++ {
conf += fmt.Sprintf(` [frontends.frontend%[1]d]
backend = "backend%[1]d"
`, i)
}
return conf
}
// createBackendConfiguration Helper
func createBackendConfiguration(n int) string {
conf := "[backends]\n"
for i := 1; i <= n; i++ {
conf += fmt.Sprintf(` [backends.backend%[1]d]
[backends.backend%[1]d.servers.server1]
url = "http://172.17.0.%[1]d:80"
`, i)
}
return conf
}