DockerCLI/vendor/github.com/moby/buildkit/session/grpc.go

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package session
import (
"context"
"net"
"sync/atomic"
"time"
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/net/http2"
"google.golang.org/grpc"
"google.golang.org/grpc/health/grpc_health_v1"
)
func serve(ctx context.Context, grpcServer *grpc.Server, conn net.Conn) {
go func() {
<-ctx.Done()
conn.Close()
}()
logrus.Debugf("serving grpc connection")
(&http2.Server{}).ServeConn(conn, &http2.ServeConnOpts{Handler: grpcServer})
}
func grpcClientConn(ctx context.Context, conn net.Conn) (context.Context, *grpc.ClientConn, error) {
var dialCount int64
dialer := grpc.WithDialer(func(addr string, d time.Duration) (net.Conn, error) {
if c := atomic.AddInt64(&dialCount, 1); c > 1 {
return nil, errors.Errorf("only one connection allowed")
}
return conn, nil
})
dialOpts := []grpc.DialOption{
dialer,
grpc.WithInsecure(),
}
if span := opentracing.SpanFromContext(ctx); span != nil {
tracer := span.Tracer()
dialOpts = append(dialOpts,
grpc.WithUnaryInterceptor(otgrpc.OpenTracingClientInterceptor(tracer, traceFilter())),
grpc.WithStreamInterceptor(otgrpc.OpenTracingStreamClientInterceptor(tracer, traceFilter())),
)
}
cc, err := grpc.DialContext(ctx, "", dialOpts...)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create grpc client")
}
ctx, cancel := context.WithCancel(ctx)
go monitorHealth(ctx, cc, cancel)
return ctx, cc, nil
}
func monitorHealth(ctx context.Context, cc *grpc.ClientConn, cancelConn func()) {
defer cancelConn()
defer cc.Close()
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
healthClient := grpc_health_v1.NewHealthClient(cc)
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
_, err := healthClient.Check(ctx, &grpc_health_v1.HealthCheckRequest{})
cancel()
if err != nil {
return
}
}
}
}