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Add cascading timeouts

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Asim 2016-05-12 23:32:58 +01:00
parent d504abb7e2
commit 8c8573426c
2 changed files with 116 additions and 35 deletions
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134
client/rpc_client.go
View File

@ -63,6 +63,9 @@ func (r *rpcClient) call(ctx context.Context, address string, req Request, resp
}
}
// set timeout in nanoseconds
msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
// set the content type for the request
msg.Header["Content-Type"] = req.ContentType()
cf, err := r.newCodec(req.ContentType())
@ -81,13 +84,11 @@ func (r *rpcClient) call(ctx context.Context, address string, req Request, resp
closed: make(chan bool),
codec: newRpcPlusCodec(msg, c, cf),
}
defer stream.Close()
ch := make(chan error, 1)
go func() {
// defer stream close
defer stream.Close()
// send request
if err := stream.Send(req.Request()); err != nil {
ch <- err
@ -105,12 +106,11 @@ func (r *rpcClient) call(ctx context.Context, address string, req Request, resp
}()
select {
case err = <-ch:
case <-time.After(opts.RequestTimeout):
err = errors.New("go.micro.client", "request timeout", 408)
}
case err := <-ch:
return err
case <-ctx.Done():
return ctx.Err()
}
}
func (r *rpcClient) stream(ctx context.Context, address string, req Request, opts CallOptions) (Streamer, error) {
@ -125,6 +125,9 @@ func (r *rpcClient) stream(ctx context.Context, address string, req Request, opt
}
}
// set timeout in nanoseconds
msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
// set the content type for the request
msg.Header["Content-Type"] = req.ContentType()
cf, err := r.newCodec(req.ContentType())
@ -150,13 +153,21 @@ func (r *rpcClient) stream(ctx context.Context, address string, req Request, opt
ch <- stream.Send(req.Request())
}()
var grr error
select {
case err = <-ch:
case <-time.After(opts.RequestTimeout):
err = errors.New("go.micro.client", "request timeout", 408)
case err := <-ch:
grr = err
case <-ctx.Done():
grr = ctx.Err()
}
return stream, err
if grr != nil {
stream.Close()
return nil, grr
}
return stream, nil
}
func (r *rpcClient) Init(opts ...Option) error {
@ -173,22 +184,20 @@ func (r *rpcClient) Options() Options {
func (r *rpcClient) CallRemote(ctx context.Context, address string, request Request, response interface{}, opts ...CallOption) error {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
return r.call(ctx, address, request, response, callOpts)
}
func (r *rpcClient) Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// get next nodes from the selector
next, err := r.opts.Selector.Select(request.Service(), callOpts.SelectOptions...)
if err != nil && err == selector.ErrNotFound {
return errors.NotFound("go.micro.client", err.Error())
@ -196,9 +205,20 @@ func (r *rpcClient) Call(ctx context.Context, request Request, response interfac
return errors.InternalServerError("go.micro.client", err.Error())
}
var grr error
// check if we already have a deadline
d, ok := ctx.Deadline()
if !ok {
// no deadline so we create a new one
ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
} else {
// got a deadline so no need to setup context
// but we need to set the timeout we pass along
opt := WithRequestTimeout(d.Sub(time.Now()))
opt(&callOpts)
}
for i := 0; i < callOpts.Retries; i++ {
// return errors.New("go.micro.client", "request timeout", 408)
call := func(i int) error {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, request, i)
if err != nil {
@ -210,6 +230,7 @@ func (r *rpcClient) Call(ctx context.Context, request Request, response interfac
time.Sleep(t)
}
// select next node
node, err := next()
if err != nil && err == selector.ErrNotFound {
return errors.NotFound("go.micro.client", err.Error())
@ -217,42 +238,58 @@ func (r *rpcClient) Call(ctx context.Context, request Request, response interfac
return errors.InternalServerError("go.micro.client", err.Error())
}
// set the address
address := node.Address
if node.Port > 0 {
address = fmt.Sprintf("%s:%d", address, node.Port)
}
grr = r.call(ctx, address, request, response, callOpts)
r.opts.Selector.Mark(request.Service(), node, grr)
// make the call
err = r.call(ctx, address, request, response, callOpts)
r.opts.Selector.Mark(request.Service(), node, err)
return err
}
ch := make(chan error, callOpts.Retries)
var gerr error
for i := 0; i < callOpts.Retries; i++ {
go func() {
ch <- call(i)
}()
select {
case <-ctx.Done():
return ctx.Err()
case err := <-ch:
// if the call succeeded lets bail early
if grr == nil {
if err == nil {
return nil
}
gerr = err
}
}
return grr
return gerr
}
func (r *rpcClient) StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
return r.stream(ctx, address, request, callOpts)
}
func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// get next nodes from the selector
next, err := r.opts.Selector.Select(request.Service(), callOpts.SelectOptions...)
if err != nil && err == selector.ErrNotFound {
return nil, errors.NotFound("go.micro.client", err.Error())
@ -260,10 +297,19 @@ func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOpt
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
var stream Streamer
var grr error
// check if we already have a deadline
d, ok := ctx.Deadline()
if !ok {
// no deadline so we create a new one
ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
} else {
// got a deadline so no need to setup context
// but we need to set the timeout we pass along
opt := WithRequestTimeout(d.Sub(time.Now()))
opt(&callOpts)
}
for i := 0; i < callOpts.Retries; i++ {
call := func(i int) (Streamer, error) {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, request, i)
if err != nil {
@ -287,16 +333,38 @@ func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOpt
address = fmt.Sprintf("%s:%d", address, node.Port)
}
stream, grr = r.stream(ctx, address, request, callOpts)
r.opts.Selector.Mark(request.Service(), node, grr)
stream, err := r.stream(ctx, address, request, callOpts)
r.opts.Selector.Mark(request.Service(), node, err)
return stream, err
}
// bail early if succeeds
if grr == nil {
return stream, nil
type response struct {
stream Streamer
err error
}
ch := make(chan response, callOpts.Retries)
var grr error
for i := 0; i < callOpts.Retries; i++ {
go func() {
s, err := call(i)
ch <- response{s, err}
}()
select {
case <-ctx.Done():
return nil, ctx.Err()
case rsp := <-ch:
// if the call succeeded lets bail early
if rsp.err == nil {
return rsp.stream, nil
}
grr = rsp.err
}
}
return stream, grr
return nil, grr
}
func (r *rpcClient) Publish(ctx context.Context, p Publication, opts ...PublishOption) error {

13
server/rpc_server.go
View File

@ -7,6 +7,7 @@ import (
"strconv"
"strings"
"sync"
"time"
"github.com/micro/go-micro/broker"
"github.com/micro/go-micro/codec"
@ -59,7 +60,11 @@ func (s *rpcServer) accept(sock transport.Socket) {
return
}
// we use this Timeout header to set a server deadline
to := msg.Header["Timeout"]
// we use this Content-Type header to identify the codec needed
ct := msg.Header["Content-Type"]
cf, err := s.newCodec(ct)
// TODO: needs better error handling
if err != nil {
@ -80,9 +85,17 @@ func (s *rpcServer) accept(sock transport.Socket) {
hdr[k] = v
}
delete(hdr, "Content-Type")
delete(hdr, "Timeout")
ctx := metadata.NewContext(context.Background(), hdr)
// set the timeout if we have it
if len(to) > 0 {
if n, err := strconv.ParseUint(to, 10, 64); err == nil {
ctx, _ = context.WithTimeout(ctx, time.Duration(n))
}
}
// TODO: needs better error handling
if err := s.rpc.serveRequest(ctx, codec, ct); err != nil {
log.Printf("Unexpected error serving request, closing socket: %v", err)