micro/client/mucp/mucp.go

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2019-06-08 21:40:44 +03:00
// Package mucp provides an mucp client
package mucp
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import (
"context"
"fmt"
"sync/atomic"
"time"
"github.com/google/uuid"
"github.com/micro/go-micro/v3/broker"
"github.com/micro/go-micro/v3/client"
"github.com/micro/go-micro/v3/codec"
raw "github.com/micro/go-micro/v3/codec/bytes"
"github.com/micro/go-micro/v3/errors"
"github.com/micro/go-micro/v3/metadata"
"github.com/micro/go-micro/v3/transport"
"github.com/micro/go-micro/v3/util/buf"
"github.com/micro/go-micro/v3/util/pool"
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)
type rpcClient struct {
once atomic.Value
opts client.Options
pool pool.Pool
seq uint64
}
// NewClient returns a new micro client interface
func NewClient(opt ...client.Option) client.Client {
opts := client.NewOptions(opt...)
p := pool.NewPool(
pool.Size(opts.PoolSize),
pool.TTL(opts.PoolTTL),
pool.Transport(opts.Transport),
)
rc := &rpcClient{
opts: opts,
pool: p,
seq: 0,
}
rc.once.Store(false)
c := client.Client(rc)
// wrap in reverse
for i := len(opts.Wrappers); i > 0; i-- {
c = opts.Wrappers[i-1](c)
}
return c
}
func (r *rpcClient) newCodec(contentType string) (codec.NewCodec, error) {
if c, ok := r.opts.Codecs[contentType]; ok {
return c, nil
}
if cf, ok := DefaultCodecs[contentType]; ok {
return cf, nil
}
return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
}
func (r *rpcClient) call(ctx context.Context, addr string, req client.Request, resp interface{}, opts client.CallOptions) error {
msg := &transport.Message{
Header: make(map[string]string),
}
md, ok := metadata.FromContext(ctx)
if ok {
for k, v := range md {
// don't copy Micro-Topic header, that used for pub/sub
// this fix case then client uses the same context that received in subscriber
if k == "Micro-Topic" {
continue
}
msg.Header[k] = v
}
}
// 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()
// set the accept header
msg.Header["Accept"] = req.ContentType()
cf, err := r.newCodec(req.ContentType())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
dOpts := []transport.DialOption{
transport.WithStream(),
}
if opts.DialTimeout >= 0 {
dOpts = append(dOpts, transport.WithTimeout(opts.DialTimeout))
}
c, err := r.pool.Get(addr, dOpts...)
if err != nil {
return errors.InternalServerError("go.micro.client", "connection error: %v", err)
}
seq := atomic.AddUint64(&r.seq, 1) - 1
codec := newRpcCodec(msg, c, cf, "")
rsp := &rpcResponse{
socket: c,
codec: codec,
}
stream := &rpcStream{
id: fmt.Sprintf("%v", seq),
context: ctx,
request: req,
response: rsp,
codec: codec,
closed: make(chan bool),
release: func(err error) { r.pool.Release(c, err) },
sendEOS: false,
}
// close the stream on exiting this function
defer stream.Close()
// wait for error response
ch := make(chan error, 1)
go func() {
defer func() {
if r := recover(); r != nil {
ch <- errors.InternalServerError("go.micro.client", "panic recovered: %v", r)
}
}()
// send request
if err := stream.Send(req.Body()); err != nil {
ch <- err
return
}
// recv request
if err := stream.Recv(resp); err != nil {
ch <- err
return
}
// success
ch <- nil
}()
var grr error
select {
case err := <-ch:
return err
case <-ctx.Done():
grr = errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
}
// set the stream error
if grr != nil {
stream.Lock()
stream.err = grr
stream.Unlock()
return grr
}
return nil
}
func (r *rpcClient) stream(ctx context.Context, addr string, req client.Request, opts client.CallOptions) (client.Stream, error) {
msg := &transport.Message{
Header: make(map[string]string),
}
md, ok := metadata.FromContext(ctx)
if ok {
for k, v := range md {
msg.Header[k] = v
}
}
// set timeout in nanoseconds
if opts.StreamTimeout > time.Duration(0) {
msg.Header["Timeout"] = fmt.Sprintf("%d", opts.StreamTimeout)
}
// set the content type for the request
msg.Header["Content-Type"] = req.ContentType()
// set the accept header
msg.Header["Accept"] = req.ContentType()
cf, err := r.newCodec(req.ContentType())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
dOpts := []transport.DialOption{
transport.WithStream(),
}
if opts.DialTimeout >= 0 {
dOpts = append(dOpts, transport.WithTimeout(opts.DialTimeout))
}
c, err := r.opts.Transport.Dial(addr, dOpts...)
if err != nil {
return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
}
// increment the sequence number
seq := atomic.AddUint64(&r.seq, 1) - 1
id := fmt.Sprintf("%v", seq)
// create codec with stream id
codec := newRpcCodec(msg, c, cf, id)
rsp := &rpcResponse{
socket: c,
codec: codec,
}
// set request codec
if r, ok := req.(*rpcRequest); ok {
r.codec = codec
}
stream := &rpcStream{
id: id,
context: ctx,
request: req,
response: rsp,
codec: codec,
// used to close the stream
closed: make(chan bool),
// signal the end of stream,
sendEOS: true,
// release func
release: func(err error) { c.Close() },
}
// wait for error response
ch := make(chan error, 1)
go func() {
// send the first message
ch <- stream.Send(req.Body())
}()
var grr error
select {
case err := <-ch:
grr = err
case <-ctx.Done():
grr = errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
}
if grr != nil {
// set the error
stream.Lock()
stream.err = grr
stream.Unlock()
// close the stream
stream.Close()
return nil, grr
}
return stream, nil
}
func (r *rpcClient) Init(opts ...client.Option) error {
size := r.opts.PoolSize
ttl := r.opts.PoolTTL
tr := r.opts.Transport
for _, o := range opts {
o(&r.opts)
}
// update pool configuration if the options changed
if size != r.opts.PoolSize || ttl != r.opts.PoolTTL || tr != r.opts.Transport {
// close existing pool
r.pool.Close()
// create new pool
r.pool = pool.NewPool(
pool.Size(r.opts.PoolSize),
pool.TTL(r.opts.PoolTTL),
pool.Transport(r.opts.Transport),
)
}
return nil
}
func (r *rpcClient) Options() client.Options {
return r.opts
}
func (r *rpcClient) Call(ctx context.Context, request client.Request, response interface{}, opts ...client.CallOption) error {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// check if we already have a deadline
if d, ok := ctx.Deadline(); !ok {
// no deadline so we create a new one
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
defer cancel()
} else {
// got a deadline so no need to setup context
// but we need to set the timeout we pass along
remaining := d.Sub(time.Now())
client.WithRequestTimeout(remaining)(&callOpts)
}
// should we noop right here?
select {
case <-ctx.Done():
return errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
default:
}
// make copy of call method
rcall := r.call
// wrap the call in reverse
for i := len(callOpts.CallWrappers); i > 0; i-- {
rcall = callOpts.CallWrappers[i-1](rcall)
}
// use the router passed as a call option, or fallback to the rpc clients router
if callOpts.Router == nil {
callOpts.Router = r.opts.Router
}
if callOpts.Selector == nil {
callOpts.Selector = r.opts.Selector
}
// inject proxy address
// TODO: don't even bother using Lookup/Select in this case
if len(r.opts.Proxy) > 0 {
callOpts.Address = []string{r.opts.Proxy}
}
// lookup the route to send the reques to
// TODO apply any filtering here
routes, err := r.opts.Lookup(ctx, request, callOpts)
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// balance the list of nodes
next, err := callOpts.Selector.Select(routes)
if err != nil {
return err
}
// 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 {
return errors.InternalServerError("go.micro.client", "backoff error: %v", err.Error())
}
// only sleep if greater than 0
if t.Seconds() > 0 {
time.Sleep(t)
}
// get the next node
node := next()
// make the call
err = rcall(ctx, node, request, response, callOpts)
// record the result of the call to inform future routing decisions
r.opts.Selector.Record(node, err)
return err
}
// get the retries
retries := callOpts.Retries
// disable retries when using a proxy
if len(r.opts.Proxy) > 0 {
retries = 0
}
ch := make(chan error, retries+1)
var gerr error
for i := 0; i <= retries; i++ {
go func(i int) {
ch <- call(i)
}(i)
select {
case <-ctx.Done():
return errors.Timeout("go.micro.client", fmt.Sprintf("call timeout: %v", ctx.Err()))
case err := <-ch:
// if the call succeeded lets bail early
if err == nil {
return nil
}
retry, rerr := callOpts.Retry(ctx, request, i, err)
if rerr != nil {
return rerr
}
if !retry {
return err
}
gerr = err
}
}
return gerr
}
func (r *rpcClient) Stream(ctx context.Context, request client.Request, opts ...client.CallOption) (client.Stream, error) {
// make a copy of call opts
callOpts := r.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// should we noop right here?
select {
case <-ctx.Done():
return nil, errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
default:
}
// use the router passed as a call option, or fallback to the rpc clients router
if callOpts.Router == nil {
callOpts.Router = r.opts.Router
}
if callOpts.Selector == nil {
callOpts.Selector = r.opts.Selector
}
// inject proxy address
// TODO: don't even bother using Lookup/Select in this case
if len(r.opts.Proxy) > 0 {
callOpts.Address = []string{r.opts.Proxy}
}
// lookup the route to send the reques to
// TODO apply any filtering here
routes, err := r.opts.Lookup(ctx, request, callOpts)
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
// balance the list of nodes
next, err := callOpts.Selector.Select(routes)
if err != nil {
return nil, err
}
call := func(i int) (client.Stream, error) {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, request, i)
if err != nil {
return nil, errors.InternalServerError("go.micro.client", "backoff error: %v", err.Error())
}
// only sleep if greater than 0
if t.Seconds() > 0 {
time.Sleep(t)
}
// get the next node
node := next()
// perform the call
stream, err := r.stream(ctx, node, request, callOpts)
// record the result of the call to inform future routing decisions
r.opts.Selector.Record(node, err)
return stream, err
}
type response struct {
stream client.Stream
err error
}
// get the retries
retries := callOpts.Retries
// disable retries when using a proxy
if len(r.opts.Proxy) > 0 {
retries = 0
}
ch := make(chan response, retries+1)
var grr error
for i := 0; i <= retries; i++ {
go func(i int) {
s, err := call(i)
ch <- response{s, err}
}(i)
select {
case <-ctx.Done():
return nil, errors.Timeout("go.micro.client", fmt.Sprintf("call timeout: %v", ctx.Err()))
case rsp := <-ch:
// if the call succeeded lets bail early
if rsp.err == nil {
return rsp.stream, nil
}
retry, rerr := callOpts.Retry(ctx, request, i, rsp.err)
if rerr != nil {
return nil, rerr
}
if !retry {
return nil, rsp.err
}
grr = rsp.err
}
}
return nil, grr
}
func (r *rpcClient) Publish(ctx context.Context, msg client.Message, opts ...client.PublishOption) error {
options := client.PublishOptions{
Context: context.Background(),
}
for _, o := range opts {
o(&options)
}
md, ok := metadata.FromContext(ctx)
if !ok {
md = make(map[string]string)
}
id := uuid.New().String()
md["Content-Type"] = msg.ContentType()
md["Micro-Topic"] = msg.Topic()
md["Micro-Id"] = id
// set the topic
topic := msg.Topic()
// get the exchange
if len(options.Exchange) > 0 {
topic = options.Exchange
}
// encode message body
cf, err := r.newCodec(msg.ContentType())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
var body []byte
// passed in raw data
if d, ok := msg.Payload().(*raw.Frame); ok {
body = d.Data
} else {
// new buffer
b := buf.New(nil)
if err := cf(b).Write(&codec.Message{
Target: topic,
Type: codec.Event,
Header: map[string]string{
"Micro-Id": id,
"Micro-Topic": msg.Topic(),
},
}, msg.Payload()); err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// set the body
body = b.Bytes()
}
if !r.once.Load().(bool) {
if err = r.opts.Broker.Connect(); err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
r.once.Store(true)
}
return r.opts.Broker.Publish(topic, &broker.Message{
Header: md,
Body: body,
}, broker.PublishContext(options.Context))
}
func (r *rpcClient) NewMessage(topic string, message interface{}, opts ...client.MessageOption) client.Message {
return newMessage(topic, message, r.opts.ContentType, opts...)
}
func (r *rpcClient) NewRequest(service, method string, request interface{}, reqOpts ...client.RequestOption) client.Request {
return newRequest(service, method, request, r.opts.ContentType, reqOpts...)
}
func (r *rpcClient) String() string {
return "mucp"
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}