/
grpc.go
138 lines (131 loc) · 2.88 KB
/
grpc.go
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package main
import (
"golang.org/x/net/context"
"github.com/DanielHeckrath/short/pb"
"github.com/go-kit/kit/endpoint"
)
// A binding wraps an Endpoint so that it's usable by a transport. grpcBinding
// makes an Endpoint usable over gRPC.
type grpcBinding struct {
shorten endpoint.Endpoint
resolve endpoint.Endpoint
info endpoint.Endpoint
latest endpoint.Endpoint
}
func (b grpcBinding) Resolve(ctx0 context.Context, req *pb.ResolveRequest) (*pb.ResolveResponse, error) {
var (
ctx, cancel = context.WithCancel(ctx0)
errs = make(chan error, 1)
replies = make(chan *pb.ResolveResponse, 1)
)
defer cancel()
go func() {
r, err := b.latest(ctx, req)
if err != nil {
errs <- err
return
}
resp, ok := r.(*pb.ResolveResponse)
if !ok {
errs <- endpoint.ErrBadCast
return
}
replies <- resp
}()
select {
case <-ctx.Done():
return nil, context.DeadlineExceeded
case err := <-errs:
return nil, err
case reply := <-replies:
return reply, nil
}
}
func (b grpcBinding) Info(ctx0 context.Context, req *pb.InfoRequest) (*pb.InfoResponse, error) {
var (
ctx, cancel = context.WithCancel(ctx0)
errs = make(chan error, 1)
replies = make(chan *pb.InfoResponse, 1)
)
defer cancel()
go func() {
r, err := b.info(ctx, req)
if err != nil {
errs <- err
return
}
resp, ok := r.(*pb.InfoResponse)
if !ok {
errs <- endpoint.ErrBadCast
return
}
replies <- resp
}()
select {
case <-ctx.Done():
return nil, context.DeadlineExceeded
case err := <-errs:
return nil, err
case reply := <-replies:
return reply, nil
}
}
func (b grpcBinding) Latest(ctx0 context.Context, req *pb.LatestRequest) (*pb.LatestResponse, error) {
var (
ctx, cancel = context.WithCancel(ctx0)
errs = make(chan error, 1)
replies = make(chan *pb.LatestResponse, 1)
)
defer cancel()
go func() {
r, err := b.latest(ctx, req)
if err != nil {
errs <- err
return
}
resp, ok := r.(*pb.LatestResponse)
if !ok {
errs <- endpoint.ErrBadCast
return
}
replies <- resp
}()
select {
case <-ctx.Done():
return nil, context.DeadlineExceeded
case err := <-errs:
return nil, err
case reply := <-replies:
return reply, nil
}
}
// Shorten implements the proto3 Short service by forwarding to the wrapped Endpoint.
func (b grpcBinding) Shorten(ctx0 context.Context, req *pb.ShortenRequest) (*pb.ShortenResponse, error) {
var (
ctx, cancel = context.WithCancel(ctx0)
errs = make(chan error, 1)
replies = make(chan *pb.ShortenResponse, 1)
)
defer cancel()
go func() {
r, err := b.shorten(ctx, req)
if err != nil {
errs <- err
return
}
resp, ok := r.(*pb.ShortenResponse)
if !ok {
errs <- endpoint.ErrBadCast
return
}
replies <- resp
}()
select {
case <-ctx.Done():
return nil, context.DeadlineExceeded
case err := <-errs:
return nil, err
case reply := <-replies:
return reply, nil
}
}