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gateway.go
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gateway.go
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package gateway
import (
"context"
"sync"
"time"
"github.com/moby/buildkit/client/buildid"
"github.com/moby/buildkit/frontend/gateway"
gwapi "github.com/moby/buildkit/frontend/gateway/pb"
"github.com/pkg/errors"
"google.golang.org/grpc"
)
type GatewayForwarder struct {
mu sync.RWMutex
updateCond *sync.Cond
builds map[string]gateway.LLBBridgeForwarder
}
func NewGatewayForwarder() *GatewayForwarder {
gwf := &GatewayForwarder{
builds: map[string]gateway.LLBBridgeForwarder{},
}
gwf.updateCond = sync.NewCond(gwf.mu.RLocker())
return gwf
}
func (gwf *GatewayForwarder) Register(server *grpc.Server) {
gwapi.RegisterLLBBridgeServer(server, gwf)
}
func (gwf *GatewayForwarder) RegisterBuild(ctx context.Context, id string, bridge gateway.LLBBridgeForwarder) error {
gwf.mu.Lock()
defer gwf.mu.Unlock()
if _, ok := gwf.builds[id]; ok {
return errors.Errorf("build ID %s exists", id)
}
gwf.builds[id] = bridge
gwf.updateCond.Broadcast()
return nil
}
func (gwf *GatewayForwarder) UnregisterBuild(ctx context.Context, id string) {
gwf.mu.Lock()
defer gwf.mu.Unlock()
delete(gwf.builds, id)
gwf.updateCond.Broadcast()
}
func (gwf *GatewayForwarder) lookupForwarder(ctx context.Context) (gateway.LLBBridgeForwarder, error) {
bid := buildid.FromIncomingContext(ctx)
if bid == "" {
return nil, errors.New("no buildid found in context")
}
ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
defer cancel()
go func() {
<-ctx.Done()
gwf.mu.Lock()
gwf.updateCond.Broadcast()
gwf.mu.Unlock()
}()
gwf.mu.RLock()
defer gwf.mu.RUnlock()
for {
select {
case <-ctx.Done():
return nil, errors.Errorf("no such job %s", bid)
default:
}
fwd, ok := gwf.builds[bid]
if !ok {
gwf.updateCond.Wait()
continue
}
return fwd, nil
}
}
func (gwf *GatewayForwarder) ResolveImageConfig(ctx context.Context, req *gwapi.ResolveImageConfigRequest) (*gwapi.ResolveImageConfigResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding ResolveImageConfig")
}
return fwd.ResolveImageConfig(ctx, req)
}
func (gwf *GatewayForwarder) Solve(ctx context.Context, req *gwapi.SolveRequest) (*gwapi.SolveResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Solve")
}
return fwd.Solve(ctx, req)
}
func (gwf *GatewayForwarder) ReadFile(ctx context.Context, req *gwapi.ReadFileRequest) (*gwapi.ReadFileResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding ReadFile")
}
return fwd.ReadFile(ctx, req)
}
func (gwf *GatewayForwarder) Evaluate(ctx context.Context, req *gwapi.EvaluateRequest) (*gwapi.EvaluateResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Evaluate")
}
return fwd.Evaluate(ctx, req)
}
func (gwf *GatewayForwarder) Ping(ctx context.Context, req *gwapi.PingRequest) (*gwapi.PongResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Ping")
}
return fwd.Ping(ctx, req)
}
func (gwf *GatewayForwarder) Return(ctx context.Context, req *gwapi.ReturnRequest) (*gwapi.ReturnResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Return")
}
res, err := fwd.Return(ctx, req)
return res, err
}
func (gwf *GatewayForwarder) Inputs(ctx context.Context, req *gwapi.InputsRequest) (*gwapi.InputsResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Inputs")
}
res, err := fwd.Inputs(ctx, req)
return res, err
}
func (gwf *GatewayForwarder) ReadDir(ctx context.Context, req *gwapi.ReadDirRequest) (*gwapi.ReadDirResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding ReadDir")
}
return fwd.ReadDir(ctx, req)
}
func (gwf *GatewayForwarder) StatFile(ctx context.Context, req *gwapi.StatFileRequest) (*gwapi.StatFileResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding StatFile")
}
return fwd.StatFile(ctx, req)
}
func (gwf *GatewayForwarder) NewContainer(ctx context.Context, req *gwapi.NewContainerRequest) (*gwapi.NewContainerResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding NewContainer")
}
return fwd.NewContainer(ctx, req)
}
func (gwf *GatewayForwarder) ReleaseContainer(ctx context.Context, req *gwapi.ReleaseContainerRequest) (*gwapi.ReleaseContainerResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding ReleaseContainer")
}
return fwd.ReleaseContainer(ctx, req)
}
func (gwf *GatewayForwarder) ExecProcess(srv gwapi.LLBBridge_ExecProcessServer) error {
fwd, err := gwf.lookupForwarder(srv.Context())
if err != nil {
return errors.Wrap(err, "forwarding ExecProcess")
}
return fwd.ExecProcess(srv)
}
func (gwf *GatewayForwarder) Warn(ctx context.Context, req *gwapi.WarnRequest) (*gwapi.WarnResponse, error) {
fwd, err := gwf.lookupForwarder(ctx)
if err != nil {
return nil, errors.Wrap(err, "forwarding Warn")
}
return fwd.Warn(ctx, req)
}