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|
package cache_test
import (
"bytes"
"context"
"errors"
"flag"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"testing"
"time"
"github.com/golang/protobuf/proto"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"gitlab.com/gitlab-org/gitaly-proto/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/internal/cache"
"gitlab.com/gitlab-org/gitaly/internal/config"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
const (
helperProcess = "GO_WANT_HELPER_PROCESS"
getOp = "get"
putOp = "put"
)
// TestHelper allows us to create dedicated processes for testing
// our file locking strategy. The test process will accept command line args to
// determine the course of action. Depending on the operation, STDIN or STDOUT
// may be used. Upon error, exit status 1 will be returned along with error
// messages on STDERR.
// See original inspiration for this test pattern:
// https://npf.io/2015/06/testing-exec-command/
func TestHelper(_ *testing.T) {
if os.Getenv(helperProcess) != "1" {
// wan't invoked by function execTestHelper
return
}
var (
fset = flag.NewFlagSet("helper", flag.ExitOnError)
opFlag = fset.String("op", "", "get|put|invalidate")
root = fset.String("root", "", "root dir for stream DBs")
repo = fset.String("repo", "", "target repo")
req = fset.String("req", "", "request to cache")
method = fset.String("method", "", "grpc method to inject into context")
)
for i, arg := range os.Args {
if arg == "--" {
err := fset.Parse(os.Args[i+1:])
if err != nil {
log.Fatal(err)
}
break
}
}
db, err := cache.OpenStreamDB(*root, cache.NaiveKeyer{})
if err != nil {
log.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
ctx = setMockMethodCtx(ctx, *method)
switch *opFlag {
case getOp:
stream, err := db.GetStream(ctx, mustDecodeRepo(*repo), mustDecodeReq(*req))
if err != nil {
log.Fatal(err)
}
_, err = io.Copy(os.Stdout, stream)
if err != nil {
log.Fatal(err)
}
case putOp:
err := db.PutStream(ctx, mustDecodeRepo(*repo), mustDecodeReq(*req), os.Stdin)
if err != nil {
log.Fatal(err)
}
default:
log.Fatalf("invalid op: %s", *opFlag)
}
}
func mustDecodeRepo(rawPB string) *gitalypb.Repository {
repo := new(gitalypb.Repository)
err := proto.Unmarshal([]byte(rawPB), repo)
if err != nil {
log.Fatal(err)
}
return repo
}
func mustDecodeReq(rawPB string) *gitalypb.InfoRefsRequest {
req := new(gitalypb.InfoRefsRequest)
err := proto.Unmarshal([]byte(rawPB), req)
if err != nil {
log.Fatal(err)
}
return req
}
func execTestHelper(t testing.TB, root, method, op string, stdin io.Reader, repo *gitalypb.Repository, req *gitalypb.InfoRefsRequest) (io.Reader, <-chan error) {
args := []string{
"-test.run=TestHelper",
"--", // no more "go test" args, now our custom args
"root=" + root,
"op=" + op,
"method=" + method,
}
switch op {
case getOp:
fallthrough
case putOp:
rawReq, err := proto.Marshal(repo)
assert.NoError(t, err)
rawRepo, err := proto.Marshal(repo)
assert.NoError(t, err)
args = append(args, "req="+string(rawReq), "repo="+string(rawRepo))
default:
assert.Fail(t, "🤠") // whoa cow poke, are you lost?
}
cmd := exec.Command(os.Args[0], args...)
cmd.Env = []string{helperProcess + "=1"}
cmd.Stdin = stdin
pr, pw := io.Pipe()
cmd.Stdout = pw
stderrB := new(bytes.Buffer)
cmd.Stderr = stderrB
errQ := make(chan error)
go func() {
if err := cmd.Run(); err != nil {
errQ <- errors.New(stderrB.String())
}
}()
return pr, errQ
}
func tempDB(t testing.TB, ck cache.CacheKeyer) (*cache.StreamDB, func()) {
root, err := ioutil.TempDir("", t.Name())
assert.NoError(t, err)
oldCfg := config.Config
config.Config.Storages = []config.Storage{
{
Name: "default",
Path: root,
},
}
cleanup := func() {
lsOutput, err := exec.Command("find", root).Output()
require.NoError(t, err)
log.Print(string(lsOutput))
config.Config = oldCfg
require.NoError(t, os.RemoveAll(root))
}
db, err := cache.OpenStreamDB(root, ck)
assert.NoError(t, err)
return db, cleanup
}
func setMockMethodCtx(ctx context.Context, method string) context.Context {
return grpc.NewContextWithServerTransportStream(ctx, mockServerTransportStream{method})
}
type mockServerTransportStream struct {
method string
}
func (msts mockServerTransportStream) Method() string { return msts.method }
func (mockServerTransportStream) SetHeader(md metadata.MD) error { return nil }
func (mockServerTransportStream) SendHeader(md metadata.MD) error { return nil }
func (mockServerTransportStream) SetTrailer(md metadata.MD) error { return nil }
|
