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storage.go
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storage.go
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package fakestorage
import (
"fmt"
"net"
"net/http"
"net/http/httptest"
"net/url"
"os"
"strings"
"github.com/docker/docker/integration-cli/cli"
"github.com/docker/docker/integration-cli/cli/build"
"github.com/docker/docker/integration-cli/cli/build/fakecontext"
"github.com/docker/docker/integration-cli/request"
"github.com/docker/docker/internal/test/environment"
"github.com/docker/docker/internal/testutil"
"github.com/stretchr/testify/require"
)
var testEnv *environment.Execution
type testingT interface {
require.TestingT
logT
Fatal(args ...interface{})
Fatalf(string, ...interface{})
}
type logT interface {
Logf(string, ...interface{})
}
// Fake is a static file server. It might be running locally or remotely
// on test host.
type Fake interface {
Close() error
URL() string
CtxDir() string
}
// SetTestEnvironment sets a static test environment
// TODO: decouple this package from environment
func SetTestEnvironment(env *environment.Execution) {
testEnv = env
}
// New returns a static file server that will be use as build context.
func New(t testingT, dir string, modifiers ...func(*fakecontext.Fake) error) Fake {
if testEnv == nil {
t.Fatal("fakstorage package requires SetTestEnvironment() to be called before use.")
}
ctx := fakecontext.New(t, dir, modifiers...)
if testEnv.IsLocalDaemon() {
return newLocalFakeStorage(ctx)
}
return newRemoteFileServer(t, ctx)
}
// localFileStorage is a file storage on the running machine
type localFileStorage struct {
*fakecontext.Fake
*httptest.Server
}
func (s *localFileStorage) URL() string {
return s.Server.URL
}
func (s *localFileStorage) CtxDir() string {
return s.Fake.Dir
}
func (s *localFileStorage) Close() error {
defer s.Server.Close()
return s.Fake.Close()
}
func newLocalFakeStorage(ctx *fakecontext.Fake) *localFileStorage {
handler := http.FileServer(http.Dir(ctx.Dir))
server := httptest.NewServer(handler)
return &localFileStorage{
Fake: ctx,
Server: server,
}
}
// remoteFileServer is a containerized static file server started on the remote
// testing machine to be used in URL-accepting docker build functionality.
type remoteFileServer struct {
host string // hostname/port web server is listening to on docker host e.g. 0.0.0.0:43712
container string
image string
ctx *fakecontext.Fake
}
func (f *remoteFileServer) URL() string {
u := url.URL{
Scheme: "http",
Host: f.host}
return u.String()
}
func (f *remoteFileServer) CtxDir() string {
return f.ctx.Dir
}
func (f *remoteFileServer) Close() error {
defer func() {
if f.ctx != nil {
f.ctx.Close()
}
if f.image != "" {
if err := cli.Docker(cli.Args("rmi", "-f", f.image)).Error; err != nil {
fmt.Fprintf(os.Stderr, "Error closing remote file server : %v\n", err)
}
}
}()
if f.container == "" {
return nil
}
return cli.Docker(cli.Args("rm", "-fv", f.container)).Error
}
func newRemoteFileServer(t testingT, ctx *fakecontext.Fake) *remoteFileServer {
var (
image = fmt.Sprintf("fileserver-img-%s", strings.ToLower(testutil.GenerateRandomAlphaOnlyString(10)))
container = fmt.Sprintf("fileserver-cnt-%s", strings.ToLower(testutil.GenerateRandomAlphaOnlyString(10)))
)
ensureHTTPServerImage(t)
// Build the image
if err := ctx.Add("Dockerfile", `FROM httpserver
COPY . /static`); err != nil {
t.Fatal(err)
}
cli.BuildCmd(t, image, build.WithoutCache, build.WithExternalBuildContext(ctx))
// Start the container
cli.DockerCmd(t, "run", "-d", "-P", "--name", container, image)
// Find out the system assigned port
out := cli.DockerCmd(t, "port", container, "80/tcp").Combined()
fileserverHostPort := strings.Trim(out, "\n")
_, port, err := net.SplitHostPort(fileserverHostPort)
if err != nil {
t.Fatalf("unable to parse file server host:port: %v", err)
}
dockerHostURL, err := url.Parse(request.DaemonHost())
if err != nil {
t.Fatalf("unable to parse daemon host URL: %v", err)
}
host, _, err := net.SplitHostPort(dockerHostURL.Host)
if err != nil {
t.Fatalf("unable to parse docker daemon host:port: %v", err)
}
return &remoteFileServer{
container: container,
image: image,
host: fmt.Sprintf("%s:%s", host, port),
ctx: ctx}
}