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package fakestorage // import "github.com/docker/docker/testutil/fakestorage"
import (
"context"
"fmt"
"io"
"net/http"
"net/http/httptest"
"net/url"
"os"
"strings"
"testing"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/client"
"github.com/docker/docker/testutil"
"github.com/docker/docker/testutil/environment"
"github.com/docker/docker/testutil/fakecontext"
"github.com/docker/docker/testutil/request"
"github.com/docker/go-connections/nat"
"gotest.tools/v3/assert"
)
var testEnv *environment.Execution
// 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 testing.TB, dir string, modifiers ...func(*fakecontext.Fake) error) Fake {
t.Helper()
if testEnv == nil {
t.Fatal("fakstorage package requires SetTestEnvironment() to be called before use.")
}
ctx := fakecontext.New(t, dir, modifiers...)
switch {
case testEnv.IsRemoteDaemon() && strings.HasPrefix(request.DaemonHost(), "unix:///"):
t.Skip("e2e run : daemon is remote but docker host points to a unix socket")
case testEnv.IsLocalDaemon():
return newLocalFakeStorage(ctx)
default:
return newRemoteFileServer(t, ctx, testEnv.APIClient())
}
return nil
}
// 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
client client.APIClient
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 := f.client.ImageRemove(context.Background(), f.image, types.ImageRemoveOptions{
Force: true,
}); err != nil {
fmt.Fprintf(os.Stderr, "Error closing remote file server : %v\n", err)
}
}
if err := f.client.Close(); err != nil {
fmt.Fprintf(os.Stderr, "Error closing remote file server : %v\n", err)
}
}()
if f.container == "" {
return nil
}
return f.client.ContainerRemove(context.Background(), f.container, types.ContainerRemoveOptions{
Force: true,
RemoveVolumes: true,
})
}
func newRemoteFileServer(t testing.TB, ctx *fakecontext.Fake, c client.APIClient) *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)
}
resp, err := c.ImageBuild(context.Background(), ctx.AsTarReader(t), types.ImageBuildOptions{
NoCache: true,
Tags: []string{image},
})
assert.NilError(t, err)
_, err = io.Copy(io.Discard, resp.Body)
assert.NilError(t, err)
// Start the container
b, err := c.ContainerCreate(context.Background(), &containertypes.Config{
Image: image,
}, &containertypes.HostConfig{}, nil, nil, container)
assert.NilError(t, err)
err = c.ContainerStart(context.Background(), b.ID, types.ContainerStartOptions{})
assert.NilError(t, err)
// Find out the system assigned port
i, err := c.ContainerInspect(context.Background(), b.ID)
assert.NilError(t, err)
newP, err := nat.NewPort("tcp", "80")
assert.NilError(t, err)
ports, exists := i.NetworkSettings.Ports[newP]
if !exists || len(ports) != 1 {
t.Fatalf("unable to find port 80/tcp for %s", container)
}
host := ports[0].HostIP
port := ports[0].HostPort
return &remoteFileServer{
container: container,
image: image,
host: fmt.Sprintf("%s:%s", host, port),
ctx: ctx,
client: c,
}
}
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