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package rubyserver
import (
"context"
"io"
"os"
"strings"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
"google.golang.org/grpc/metadata"
)
// Headers prefixed with this string get whitelisted automatically
const rubyFeaturePrefix = "gitaly-feature-ruby-"
const (
storagePathHeader = "gitaly-storage-path"
repoPathHeader = "gitaly-repo-path"
glRepositoryHeader = "gitaly-gl-repository"
repoAltDirsHeader = "gitaly-repo-alt-dirs"
)
// SetHeadersWithoutRepoCheck adds headers that tell gitaly-ruby the full
// path to the repository. It is not an error if the repository does not
// yet exist. This can be used on RPC calls that will create a
// repository.
func SetHeadersWithoutRepoCheck(ctx context.Context, repo *gitalypb.Repository) (context.Context, error) {
return setHeaders(ctx, repo, false)
}
// SetHeaders adds headers that tell gitaly-ruby the full path to the repository.
func SetHeaders(ctx context.Context, repo *gitalypb.Repository) (context.Context, error) {
return setHeaders(ctx, repo, true)
}
func setHeaders(ctx context.Context, repo *gitalypb.Repository, mustExist bool) (context.Context, error) {
storagePath, err := helper.GetStorageByName(repo.GetStorageName())
if err != nil {
return nil, err
}
var repoPath string
if mustExist {
repoPath, err = helper.GetRepoPath(repo)
} else {
repoPath, err = helper.GetPath(repo)
}
if err != nil {
return nil, err
}
repoAltDirs := repo.GetGitAlternateObjectDirectories()
repoAltDirs = append(repoAltDirs, repo.GetGitObjectDirectory())
repoAltDirsCombined := strings.Join(repoAltDirs, string(os.PathListSeparator))
md := metadata.Pairs(
storagePathHeader, storagePath,
repoPathHeader, repoPath,
glRepositoryHeader, repo.GlRepository,
repoAltDirsHeader, repoAltDirsCombined,
)
// list of http/2 headers that will be forwarded as-is to gitaly-ruby
proxyHeaderWhitelist := []string{"gitaly-servers"}
if inMD, ok := metadata.FromIncomingContext(ctx); ok {
// Automatically whitelist any Ruby-specific feature flag
for header := range inMD {
if strings.HasPrefix(header, rubyFeaturePrefix) {
proxyHeaderWhitelist = append(proxyHeaderWhitelist, header)
}
}
for _, header := range proxyHeaderWhitelist {
for _, v := range inMD[header] {
md = metadata.Join(md, metadata.Pairs(header, v))
}
}
}
newCtx := metadata.NewOutgoingContext(ctx, md)
return newCtx, nil
}
// Proxy calls recvSend until it receives an error. The error is returned
// to the caller unless it is io.EOF.
func Proxy(recvSend func() error) (err error) {
for err == nil {
err = recvSend()
}
if err == io.EOF {
err = nil
}
return err
}
// CloseSender captures the CloseSend method from gRPC streams.
type CloseSender interface {
CloseSend() error
}
// ProxyBidi works like Proxy but runs multiple callbacks simultaneously.
// It returns immediately if proxying one of the callbacks fails. If the
// response stream is done, ProxyBidi returns immediately without waiting
// for the client stream to finish proxying.
func ProxyBidi(requestFunc func() error, requestStream CloseSender, responseFunc func() error) error {
requestErr := make(chan error, 1)
go func() {
requestErr <- Proxy(requestFunc)
}()
responseErr := make(chan error, 1)
go func() {
responseErr <- Proxy(responseFunc)
}()
for {
select {
case err := <-requestErr:
if err != nil {
return err
}
requestStream.CloseSend()
case err := <-responseErr:
return err
}
}
}
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