665 lines
14 KiB
Go
665 lines
14 KiB
Go
package client
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"os"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/google/uuid"
|
|
"github.com/micro/go-micro/broker"
|
|
"github.com/micro/go-micro/util/pool"
|
|
"github.com/micro/go-micro/client/selector"
|
|
"github.com/micro/go-micro/codec"
|
|
raw "github.com/micro/go-micro/codec/bytes"
|
|
"github.com/micro/go-micro/errors"
|
|
"github.com/micro/go-micro/metadata"
|
|
"github.com/micro/go-micro/registry"
|
|
"github.com/micro/go-micro/transport"
|
|
"github.com/micro/go-micro/util/buf"
|
|
)
|
|
|
|
type rpcClient struct {
|
|
once sync.Once
|
|
opts Options
|
|
pool pool.Pool
|
|
seq uint64
|
|
}
|
|
|
|
func newRpcClient(opt ...Option) Client {
|
|
opts := NewOptions(opt...)
|
|
|
|
p := pool.NewPool(
|
|
pool.Size(opts.PoolSize),
|
|
pool.TTL(opts.PoolTTL),
|
|
pool.Transport(opts.Transport),
|
|
)
|
|
|
|
rc := &rpcClient{
|
|
once: sync.Once{},
|
|
opts: opts,
|
|
pool: p,
|
|
seq: 0,
|
|
}
|
|
|
|
c := 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, node *registry.Node, req Request, resp interface{}, opts CallOptions) error {
|
|
address := node.Address
|
|
|
|
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
|
|
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()
|
|
|
|
// setup old protocol
|
|
cf := setupProtocol(msg, node)
|
|
|
|
// no codec specified
|
|
if cf == nil {
|
|
var err error
|
|
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(address, dOpts...)
|
|
if err != nil {
|
|
return errors.InternalServerError("go.micro.client", "connection error: %v", err)
|
|
}
|
|
|
|
seq := atomic.LoadUint64(&r.seq)
|
|
atomic.AddUint64(&r.seq, 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, node *registry.Node, req Request, opts CallOptions) (Stream, error) {
|
|
address := node.Address
|
|
|
|
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
|
|
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()
|
|
|
|
// set old codecs
|
|
cf := setupProtocol(msg, node)
|
|
|
|
// no codec specified
|
|
if cf == nil {
|
|
var err error
|
|
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(address, dOpts...)
|
|
if err != nil {
|
|
return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
|
|
}
|
|
|
|
// increment the sequence number
|
|
seq := atomic.LoadUint64(&r.seq)
|
|
atomic.AddUint64(&r.seq, 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 ...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() Options {
|
|
return r.opts
|
|
}
|
|
|
|
// hasProxy checks if we have proxy set in the environment
|
|
func (r *rpcClient) hasProxy() bool {
|
|
// get proxy
|
|
if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
|
|
return true
|
|
}
|
|
|
|
// get proxy address
|
|
if prx := os.Getenv("MICRO_PROXY_ADDRESS"); len(prx) > 0 {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// next returns an iterator for the next nodes to call
|
|
func (r *rpcClient) next(request Request, opts CallOptions) (selector.Next, error) {
|
|
service := request.Service()
|
|
|
|
// get proxy
|
|
if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
|
|
service = prx
|
|
}
|
|
|
|
// get proxy address
|
|
if prx := os.Getenv("MICRO_PROXY_ADDRESS"); len(prx) > 0 {
|
|
opts.Address = []string{prx}
|
|
}
|
|
|
|
// return remote address
|
|
if len(opts.Address) > 0 {
|
|
nodes := make([]*registry.Node, len(opts.Address))
|
|
|
|
for i, address := range opts.Address {
|
|
nodes[i] = ®istry.Node{
|
|
Address: address,
|
|
// Set the protocol
|
|
Metadata: map[string]string{
|
|
"protocol": "mucp",
|
|
},
|
|
}
|
|
}
|
|
|
|
// crude return method
|
|
return func() (*registry.Node, error) {
|
|
return nodes[time.Now().Unix()%int64(len(nodes))], nil
|
|
}, nil
|
|
}
|
|
|
|
// get next nodes from the selector
|
|
next, err := r.opts.Selector.Select(service, opts.SelectOptions...)
|
|
if err != nil {
|
|
if err == selector.ErrNotFound {
|
|
return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
|
|
}
|
|
return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
|
|
}
|
|
|
|
return next, nil
|
|
}
|
|
|
|
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)
|
|
}
|
|
|
|
next, err := r.next(request, callOpts)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// check if we already have a deadline
|
|
d, ok := ctx.Deadline()
|
|
if !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
|
|
opt := WithRequestTimeout(d.Sub(time.Now()))
|
|
opt(&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)
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
|
|
// select next node
|
|
node, err := next()
|
|
service := request.Service()
|
|
if err != nil {
|
|
if err == selector.ErrNotFound {
|
|
return errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
|
|
}
|
|
return errors.InternalServerError("go.micro.client", "error getting next %s node: %s", service, err.Error())
|
|
}
|
|
|
|
// make the call
|
|
err = rcall(ctx, node, request, response, callOpts)
|
|
r.opts.Selector.Mark(service, node, err)
|
|
return err
|
|
}
|
|
|
|
// get the retries
|
|
retries := callOpts.Retries
|
|
|
|
// disable retries when using a proxy
|
|
if r.hasProxy() {
|
|
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 Request, opts ...CallOption) (Stream, error) {
|
|
// make a copy of call opts
|
|
callOpts := r.opts.CallOptions
|
|
for _, opt := range opts {
|
|
opt(&callOpts)
|
|
}
|
|
|
|
next, err := r.next(request, callOpts)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// should we noop right here?
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, errors.Timeout("go.micro.client", fmt.Sprintf("%v", ctx.Err()))
|
|
default:
|
|
}
|
|
|
|
call := func(i int) (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)
|
|
}
|
|
|
|
node, err := next()
|
|
service := request.Service()
|
|
if err != nil {
|
|
if err == selector.ErrNotFound {
|
|
return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())
|
|
}
|
|
return nil, errors.InternalServerError("go.micro.client", "error getting next %s node: %s", service, err.Error())
|
|
}
|
|
|
|
stream, err := r.stream(ctx, node, request, callOpts)
|
|
r.opts.Selector.Mark(service, node, err)
|
|
return stream, err
|
|
}
|
|
|
|
type response struct {
|
|
stream Stream
|
|
err error
|
|
}
|
|
|
|
// get the retries
|
|
retries := callOpts.Retries
|
|
|
|
// disable retries when using a proxy
|
|
if r.hasProxy() {
|
|
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 Message, opts ...PublishOption) error {
|
|
options := 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 proxy
|
|
if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
|
|
options.Exchange = prx
|
|
}
|
|
|
|
// 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()
|
|
}
|
|
|
|
r.once.Do(func() {
|
|
r.opts.Broker.Connect()
|
|
})
|
|
|
|
return r.opts.Broker.Publish(topic, &broker.Message{
|
|
Header: md,
|
|
Body: body,
|
|
})
|
|
}
|
|
|
|
func (r *rpcClient) NewMessage(topic string, message interface{}, opts ...MessageOption) Message {
|
|
return newMessage(topic, message, r.opts.ContentType, opts...)
|
|
}
|
|
|
|
func (r *rpcClient) NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
|
|
return newRequest(service, method, request, r.opts.ContentType, reqOpts...)
|
|
}
|
|
|
|
func (r *rpcClient) String() string {
|
|
return "mucp"
|
|
}
|