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package helper
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"gitlab.com/gitlab-org/gitaly/v14/internal/storage"
"google.golang.org/grpc/metadata"
)
// ErrEmptyMetadata indicates that the gRPC metadata was not found in the
// context
var ErrEmptyMetadata = errors.New("empty metadata")
// ExtractGitalyServers extracts `storage.GitalyServers` from an incoming context.
func ExtractGitalyServers(ctx context.Context) (gitalyServersInfo storage.GitalyServers, err error) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, ErrEmptyMetadata
}
gitalyServersJSONEncoded := md["gitaly-servers"]
if len(gitalyServersJSONEncoded) == 0 {
return nil, fmt.Errorf("empty gitaly-servers metadata")
}
gitalyServersJSON, err := base64.StdEncoding.DecodeString(gitalyServersJSONEncoded[0])
if err != nil {
return nil, fmt.Errorf("failed decoding base64: %v", err)
}
if err := json.Unmarshal(gitalyServersJSON, &gitalyServersInfo); err != nil {
return nil, fmt.Errorf("failed unmarshalling json: %v", err)
}
return
}
// ExtractGitalyServer extracts server information for a specific storage
func ExtractGitalyServer(ctx context.Context, storageName string) (storage.ServerInfo, error) {
gitalyServers, err := ExtractGitalyServers(ctx)
if err != nil {
return storage.ServerInfo{}, err
}
gitalyServer, ok := gitalyServers[storageName]
if !ok {
return storage.ServerInfo{}, errors.New("storage name not found")
}
return gitalyServer, nil
}
// IncomingToOutgoing creates an outgoing context out of an incoming context with the same storage metadata
func IncomingToOutgoing(ctx context.Context) context.Context {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return ctx
}
return metadata.NewOutgoingContext(ctx, md)
}
// OutgoingToIncoming creates an incoming context out of an outgoing context with the same storage metadata
func OutgoingToIncoming(ctx context.Context) context.Context {
md, ok := metadata.FromOutgoingContext(ctx)
if !ok {
return ctx
}
return metadata.NewIncomingContext(ctx, md)
}
// InjectGitalyServers injects gitaly-servers metadata into an outgoing context
func InjectGitalyServers(ctx context.Context, name, address, token string) (context.Context, error) {
gitalyServers := storage.GitalyServers{
name: {
Address: address,
Token: token,
},
}
gitalyServersJSON, err := json.Marshal(gitalyServers)
if err != nil {
return nil, err
}
return metadata.AppendToOutgoingContext(ctx, "gitaly-servers", base64.StdEncoding.EncodeToString(gitalyServersJSON)), nil
}
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