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package rubyserver
import (
"context"
"io"
"os"
"strings"
pb "gitlab.com/gitlab-org/gitaly-proto/go"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"google.golang.org/grpc/metadata"
)
// ProxyHeaderWhitelist is the list of http/2 headers that will be
// forwarded as-is to gitaly-ruby.
var ProxyHeaderWhitelist = []string{"gitaly-servers"}
const (
repoPathHeader = "gitaly-repo-path"
glRepositoryHeader = "gitaly-gl-repository"
repoAltDirsHeader = "gitaly-repo-alt-dirs"
)
// SetHeaders adds headers that tell gitaly-ruby the full path to the repository.
func SetHeaders(ctx context.Context, repo *pb.Repository) (context.Context, error) {
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(
repoPathHeader, repoPath,
glRepositoryHeader, repo.GlRepository,
repoAltDirsHeader, repoAltDirsCombined,
)
if inMD, ok := metadata.FromIncomingContext(ctx); ok {
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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