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Added go-nats to vendor

This commit is contained in:
Lenny-Campino Hartmann 2018-08-07 21:21:35 +02:00
parent 53271ebad6
commit 4cae040470
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The MIT License (MIT)
Copyright (c) 2012-2017 Apcera Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# NATS - Go Client
A [Go](http://golang.org) client for the [NATS messaging system](https://nats.io).
[![License MIT](https://img.shields.io/badge/License-MIT-blue.svg)](http://opensource.org/licenses/MIT)
[![Go Report Card](https://goreportcard.com/badge/github.com/nats-io/go-nats)](https://goreportcard.com/report/github.com/nats-io/go-nats) [![Build Status](https://travis-ci.org/nats-io/go-nats.svg?branch=master)](http://travis-ci.org/nats-io/go-nats) [![GoDoc](https://godoc.org/github.com/nats-io/go-nats?status.svg)](http://godoc.org/github.com/nats-io/go-nats) [![Coverage Status](https://coveralls.io/repos/nats-io/go-nats/badge.svg?branch=master)](https://coveralls.io/r/nats-io/go-nats?branch=master)
## Installation
```bash
# Go client
go get github.com/nats-io/go-nats
# Server
go get github.com/nats-io/gnatsd
```
## Basic Usage
```go
nc, _ := nats.Connect(nats.DefaultURL)
// Simple Publisher
nc.Publish("foo", []byte("Hello World"))
// Simple Async Subscriber
nc.Subscribe("foo", func(m *nats.Msg) {
fmt.Printf("Received a message: %s\n", string(m.Data))
})
// Simple Sync Subscriber
sub, err := nc.SubscribeSync("foo")
m, err := sub.NextMsg(timeout)
// Channel Subscriber
ch := make(chan *nats.Msg, 64)
sub, err := nc.ChanSubscribe("foo", ch)
msg := <- ch
// Unsubscribe
sub.Unsubscribe()
// Requests
msg, err := nc.Request("help", []byte("help me"), 10*time.Millisecond)
// Replies
nc.Subscribe("help", func(m *Msg) {
nc.Publish(m.Reply, []byte("I can help!"))
})
// Close connection
nc, _ := nats.Connect("nats://localhost:4222")
nc.Close();
```
## Encoded Connections
```go
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
defer c.Close()
// Simple Publisher
c.Publish("foo", "Hello World")
// Simple Async Subscriber
c.Subscribe("foo", func(s string) {
fmt.Printf("Received a message: %s\n", s)
})
// EncodedConn can Publish any raw Go type using the registered Encoder
type person struct {
Name string
Address string
Age int
}
// Go type Subscriber
c.Subscribe("hello", func(p *person) {
fmt.Printf("Received a person: %+v\n", p)
})
me := &person{Name: "derek", Age: 22, Address: "140 New Montgomery Street, San Francisco, CA"}
// Go type Publisher
c.Publish("hello", me)
// Unsubscribe
sub, err := c.Subscribe("foo", nil)
...
sub.Unsubscribe()
// Requests
var response string
err := c.Request("help", "help me", &response, 10*time.Millisecond)
if err != nil {
fmt.Printf("Request failed: %v\n", err)
}
// Replying
c.Subscribe("help", func(subj, reply string, msg string) {
c.Publish(reply, "I can help!")
})
// Close connection
c.Close();
```
## TLS
```go
// tls as a scheme will enable secure connections by default. This will also verify the server name.
nc, err := nats.Connect("tls://nats.demo.io:4443")
// If you are using a self-signed certificate, you need to have a tls.Config with RootCAs setup.
// We provide a helper method to make this case easier.
nc, err = nats.Connect("tls://localhost:4443", nats.RootCAs("./configs/certs/ca.pem"))
// If the server requires client certificate, there is an helper function for that too:
cert := nats.ClientCert("./configs/certs/client-cert.pem", "./configs/certs/client-key.pem")
nc, err = nats.Connect("tls://localhost:4443", cert)
// You can also supply a complete tls.Config
certFile := "./configs/certs/client-cert.pem"
keyFile := "./configs/certs/client-key.pem"
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
t.Fatalf("error parsing X509 certificate/key pair: %v", err)
}
config := &tls.Config{
ServerName: opts.Host,
Certificates: []tls.Certificate{cert},
RootCAs: pool,
MinVersion: tls.VersionTLS12,
}
nc, err = nats.Connect("nats://localhost:4443", nats.Secure(config))
if err != nil {
t.Fatalf("Got an error on Connect with Secure Options: %+v\n", err)
}
```
## Using Go Channels (netchan)
```go
nc, _ := nats.Connect(nats.DefaultURL)
ec, _ := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
defer ec.Close()
type person struct {
Name string
Address string
Age int
}
recvCh := make(chan *person)
ec.BindRecvChan("hello", recvCh)
sendCh := make(chan *person)
ec.BindSendChan("hello", sendCh)
me := &person{Name: "derek", Age: 22, Address: "140 New Montgomery Street"}
// Send via Go channels
sendCh <- me
// Receive via Go channels
who := <- recvCh
```
## Wildcard Subscriptions
```go
// "*" matches any token, at any level of the subject.
nc.Subscribe("foo.*.baz", func(m *Msg) {
fmt.Printf("Msg received on [%s] : %s\n", m.Subject, string(m.Data));
})
nc.Subscribe("foo.bar.*", func(m *Msg) {
fmt.Printf("Msg received on [%s] : %s\n", m.Subject, string(m.Data));
})
// ">" matches any length of the tail of a subject, and can only be the last token
// E.g. 'foo.>' will match 'foo.bar', 'foo.bar.baz', 'foo.foo.bar.bax.22'
nc.Subscribe("foo.>", func(m *Msg) {
fmt.Printf("Msg received on [%s] : %s\n", m.Subject, string(m.Data));
})
// Matches all of the above
nc.Publish("foo.bar.baz", []byte("Hello World"))
```
## Queue Groups
```go
// All subscriptions with the same queue name will form a queue group.
// Each message will be delivered to only one subscriber per queue group,
// using queuing semantics. You can have as many queue groups as you wish.
// Normal subscribers will continue to work as expected.
nc.QueueSubscribe("foo", "job_workers", func(_ *Msg) {
received += 1;
})
```
## Advanced Usage
```go
// Flush connection to server, returns when all messages have been processed.
nc.Flush()
fmt.Println("All clear!")
// FlushTimeout specifies a timeout value as well.
err := nc.FlushTimeout(1*time.Second)
if err != nil {
fmt.Println("All clear!")
} else {
fmt.Println("Flushed timed out!")
}
// Auto-unsubscribe after MAX_WANTED messages received
const MAX_WANTED = 10
sub, err := nc.Subscribe("foo")
sub.AutoUnsubscribe(MAX_WANTED)
// Multiple connections
nc1 := nats.Connect("nats://host1:4222")
nc2 := nats.Connect("nats://host2:4222")
nc1.Subscribe("foo", func(m *Msg) {
fmt.Printf("Received a message: %s\n", string(m.Data))
})
nc2.Publish("foo", []byte("Hello World!"));
```
## Clustered Usage
```go
var servers = "nats://localhost:1222, nats://localhost:1223, nats://localhost:1224"
nc, err := nats.Connect(servers)
// Optionally set ReconnectWait and MaxReconnect attempts.
// This example means 10 seconds total per backend.
nc, err = nats.Connect(servers, nats.MaxReconnects(5), nats.ReconnectWait(2 * time.Second))
// Optionally disable randomization of the server pool
nc, err = nats.Connect(servers, nats.DontRandomize())
// Setup callbacks to be notified on disconnects, reconnects and connection closed.
nc, err = nats.Connect(servers,
nats.DisconnectHandler(func(nc *nats.Conn) {
fmt.Printf("Got disconnected!\n")
}),
nats.ReconnectHandler(func(_ *nats.Conn) {
fmt.Printf("Got reconnected to %v!\n", nc.ConnectedUrl())
}),
nats.ClosedHandler(func(nc *nats.Conn) {
fmt.Printf("Connection closed. Reason: %q\n", nc.LastError())
})
)
// When connecting to a mesh of servers with auto-discovery capabilities,
// you may need to provide a username/password or token in order to connect
// to any server in that mesh when authentication is required.
// Instead of providing the credentials in the initial URL, you will use
// new option setters:
nc, err = nats.Connect("nats://localhost:4222", nats.UserInfo("foo", "bar"))
// For token based authentication:
nc, err = nats.Connect("nats://localhost:4222", nats.Token("S3cretT0ken"))
// You can even pass the two at the same time in case one of the server
// in the mesh requires token instead of user name and password.
nc, err = nats.Connect("nats://localhost:4222",
nats.UserInfo("foo", "bar"),
nats.Token("S3cretT0ken"))
// Note that if credentials are specified in the initial URLs, they take
// precedence on the credentials specfied through the options.
// For instance, in the connect call below, the client library will use
// the user "my" and password "pwd" to connect to locahost:4222, however,
// it will use username "foo" and password "bar" when (re)connecting to
// a different server URL that it got as part of the auto-discovery.
nc, err = nats.Connect("nats://my:pwd@localhost:4222", nats.UserInfo("foo", "bar"))
```
## Context support (+Go 1.7)
```go
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
nc, err := nats.Connect(nats.DefaultURL)
// Request with context
msg, err := nc.RequestWithContext(ctx, "foo", []byte("bar"))
// Synchronous subscriber with context
sub, err := nc.SubscribeSync("foo")
msg, err := sub.NextMsgWithContext(ctx)
// Encoded Request with context
c, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
type request struct {
Message string `json:"message"`
}
type response struct {
Code int `json:"code"`
}
req := &request{Message: "Hello"}
resp := &response{}
err := c.RequestWithContext(ctx, "foo", req, resp)
```
## License
(The MIT License)
Copyright (c) 2012-2017 Apcera Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.

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- [ ] Better constructors, options handling
- [ ] Functions for callback settings after connection created.
- [ ] Better options for subscriptions. Slow Consumer state settable, Go routines vs Inline.
- [ ] Move off of channels for subscribers, use syncPool linkedLists, etc with highwater.
- [ ] Test for valid subjects on publish and subscribe?
- [ ] SyncSubscriber and Next for EncodedConn
- [ ] Fast Publisher?
- [ ] pooling for structs used? leaky bucket?
- [ ] Timeout 0 should work as no timeout
- [x] Ping timer
- [x] Name in Connect for gnatsd
- [x] Asynchronous error handling
- [x] Parser rewrite
- [x] Reconnect
- [x] Hide Lock
- [x] Easier encoder interface
- [x] QueueSubscribeSync
- [x] Make nats specific errors prefixed with 'nats:'
- [x] API test for closed connection
- [x] TLS/SSL
- [x] Stats collection
- [x] Disconnect detection
- [x] Optimized Publish (coalescing)
- [x] Do Examples via Go style
- [x] Standardized Errors

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// Copyright 2012-2017 Apcera Inc. All rights reserved.
// +build go1.7
// A Go client for the NATS messaging system (https://nats.io).
package nats
import (
"context"
"fmt"
"reflect"
)
// RequestWithContext takes a context, a subject and payload
// in bytes and request expecting a single response.
func (nc *Conn) RequestWithContext(ctx context.Context, subj string, data []byte) (*Msg, error) {
if ctx == nil {
return nil, ErrInvalidContext
}
if nc == nil {
return nil, ErrInvalidConnection
}
nc.mu.Lock()
// If user wants the old style.
if nc.Opts.UseOldRequestStyle {
nc.mu.Unlock()
return nc.oldRequestWithContext(ctx, subj, data)
}
// Do setup for the new style.
if nc.respMap == nil {
// _INBOX wildcard
nc.respSub = fmt.Sprintf("%s.*", NewInbox())
nc.respMap = make(map[string]chan *Msg)
}
// Create literal Inbox and map to a chan msg.
mch := make(chan *Msg, RequestChanLen)
respInbox := nc.newRespInbox()
token := respToken(respInbox)
nc.respMap[token] = mch
createSub := nc.respMux == nil
ginbox := nc.respSub
nc.mu.Unlock()
if createSub {
// Make sure scoped subscription is setup only once.
var err error
nc.respSetup.Do(func() { err = nc.createRespMux(ginbox) })
if err != nil {
return nil, err
}
}
err := nc.PublishRequest(subj, respInbox, data)
if err != nil {
return nil, err
}
var ok bool
var msg *Msg
select {
case msg, ok = <-mch:
if !ok {
return nil, ErrConnectionClosed
}
case <-ctx.Done():
nc.mu.Lock()
delete(nc.respMap, token)
nc.mu.Unlock()
return nil, ctx.Err()
}
return msg, nil
}
// oldRequestWithContext utilizes inbox and subscription per request.
func (nc *Conn) oldRequestWithContext(ctx context.Context, subj string, data []byte) (*Msg, error) {
inbox := NewInbox()
ch := make(chan *Msg, RequestChanLen)
s, err := nc.subscribe(inbox, _EMPTY_, nil, ch)
if err != nil {
return nil, err
}
s.AutoUnsubscribe(1)
defer s.Unsubscribe()
err = nc.PublishRequest(subj, inbox, data)
if err != nil {
return nil, err
}
return s.NextMsgWithContext(ctx)
}
// NextMsgWithContext takes a context and returns the next message
// available to a synchronous subscriber, blocking until it is delivered
// or context gets canceled.
func (s *Subscription) NextMsgWithContext(ctx context.Context) (*Msg, error) {
if ctx == nil {
return nil, ErrInvalidContext
}
if s == nil {
return nil, ErrBadSubscription
}
s.mu.Lock()
err := s.validateNextMsgState()
if err != nil {
s.mu.Unlock()
return nil, err
}
// snapshot
mch := s.mch
s.mu.Unlock()
var ok bool
var msg *Msg
select {
case msg, ok = <-mch:
if !ok {
return nil, ErrConnectionClosed
}
err := s.processNextMsgDelivered(msg)
if err != nil {
return nil, err
}
case <-ctx.Done():
return nil, ctx.Err()
}
return msg, nil
}
// RequestWithContext will create an Inbox and perform a Request
// using the provided cancellation context with the Inbox reply
// for the data v. A response will be decoded into the vPtrResponse.
func (c *EncodedConn) RequestWithContext(ctx context.Context, subject string, v interface{}, vPtr interface{}) error {
if ctx == nil {
return ErrInvalidContext
}
b, err := c.Enc.Encode(subject, v)
if err != nil {
return err
}
m, err := c.Conn.RequestWithContext(ctx, subject, b)
if err != nil {
return err
}
if reflect.TypeOf(vPtr) == emptyMsgType {
mPtr := vPtr.(*Msg)
*mPtr = *m
} else {
err := c.Enc.Decode(m.Subject, m.Data, vPtr)
if err != nil {
return err
}
}
return nil
}

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// Copyright 2012-2015 Apcera Inc. All rights reserved.
package nats
import (
"errors"
"fmt"
"reflect"
"sync"
"time"
// Default Encoders
. "github.com/nats-io/go-nats/encoders/builtin"
)
// Encoder interface is for all register encoders
type Encoder interface {
Encode(subject string, v interface{}) ([]byte, error)
Decode(subject string, data []byte, vPtr interface{}) error
}
var encMap map[string]Encoder
var encLock sync.Mutex
// Indexe names into the Registered Encoders.
const (
JSON_ENCODER = "json"
GOB_ENCODER = "gob"
DEFAULT_ENCODER = "default"
)
func init() {
encMap = make(map[string]Encoder)
// Register json, gob and default encoder
RegisterEncoder(JSON_ENCODER, &JsonEncoder{})
RegisterEncoder(GOB_ENCODER, &GobEncoder{})
RegisterEncoder(DEFAULT_ENCODER, &DefaultEncoder{})
}
// EncodedConn are the preferred way to interface with NATS. They wrap a bare connection to
// a nats server and have an extendable encoder system that will encode and decode messages
// from raw Go types.
type EncodedConn struct {
Conn *Conn
Enc Encoder
}
// NewEncodedConn will wrap an existing Connection and utilize the appropriate registered
// encoder.
func NewEncodedConn(c *Conn, encType string) (*EncodedConn, error) {
if c == nil {
return nil, errors.New("nats: Nil Connection")
}
if c.IsClosed() {
return nil, ErrConnectionClosed
}
ec := &EncodedConn{Conn: c, Enc: EncoderForType(encType)}
if ec.Enc == nil {
return nil, fmt.Errorf("No encoder registered for '%s'", encType)
}
return ec, nil
}
// RegisterEncoder will register the encType with the given Encoder. Useful for customization.
func RegisterEncoder(encType string, enc Encoder) {
encLock.Lock()
defer encLock.Unlock()
encMap[encType] = enc
}
// EncoderForType will return the registered Encoder for the encType.
func EncoderForType(encType string) Encoder {
encLock.Lock()
defer encLock.Unlock()
return encMap[encType]
}
// Publish publishes the data argument to the given subject. The data argument
// will be encoded using the associated encoder.
func (c *EncodedConn) Publish(subject string, v interface{}) error {
b, err := c.Enc.Encode(subject, v)
if err != nil {
return err
}
return c.Conn.publish(subject, _EMPTY_, b)
}
// PublishRequest will perform a Publish() expecting a response on the
// reply subject. Use Request() for automatically waiting for a response
// inline.
func (c *EncodedConn) PublishRequest(subject, reply string, v interface{}) error {
b, err := c.Enc.Encode(subject, v)
if err != nil {
return err
}
return c.Conn.publish(subject, reply, b)
}
// Request will create an Inbox and perform a Request() call
// with the Inbox reply for the data v. A response will be
// decoded into the vPtrResponse.
func (c *EncodedConn) Request(subject string, v interface{}, vPtr interface{}, timeout time.Duration) error {
b, err := c.Enc.Encode(subject, v)
if err != nil {
return err
}
m, err := c.Conn.Request(subject, b, timeout)
if err != nil {
return err
}
if reflect.TypeOf(vPtr) == emptyMsgType {
mPtr := vPtr.(*Msg)
*mPtr = *m
} else {
err = c.Enc.Decode(m.Subject, m.Data, vPtr)
}
return err
}
// Handler is a specific callback used for Subscribe. It is generalized to
// an interface{}, but we will discover its format and arguments at runtime
// and perform the correct callback, including de-marshaling JSON strings
// back into the appropriate struct based on the signature of the Handler.
//
// Handlers are expected to have one of four signatures.
//
// type person struct {
// Name string `json:"name,omitempty"`
// Age uint `json:"age,omitempty"`
// }
//
// handler := func(m *Msg)
// handler := func(p *person)
// handler := func(subject string, o *obj)
// handler := func(subject, reply string, o *obj)
//
// These forms allow a callback to request a raw Msg ptr, where the processing
// of the message from the wire is untouched. Process a JSON representation
// and demarshal it into the given struct, e.g. person.
// There are also variants where the callback wants either the subject, or the
// subject and the reply subject.
type Handler interface{}
// Dissect the cb Handler's signature
func argInfo(cb Handler) (reflect.Type, int) {
cbType := reflect.TypeOf(cb)
if cbType.Kind() != reflect.Func {
panic("nats: Handler needs to be a func")
}
numArgs := cbType.NumIn()
if numArgs == 0 {
return nil, numArgs
}
return cbType.In(numArgs - 1), numArgs
}
var emptyMsgType = reflect.TypeOf(&Msg{})
// Subscribe will create a subscription on the given subject and process incoming
// messages using the specified Handler. The Handler should be a func that matches
// a signature from the description of Handler from above.
func (c *EncodedConn) Subscribe(subject string, cb Handler) (*Subscription, error) {
return c.subscribe(subject, _EMPTY_, cb)
}
// QueueSubscribe will create a queue subscription on the given subject and process
// incoming messages using the specified Handler. The Handler should be a func that
// matches a signature from the description of Handler from above.
func (c *EncodedConn) QueueSubscribe(subject, queue string, cb Handler) (*Subscription, error) {
return c.subscribe(subject, queue, cb)
}
// Internal implementation that all public functions will use.
func (c *EncodedConn) subscribe(subject, queue string, cb Handler) (*Subscription, error) {
if cb == nil {
return nil, errors.New("nats: Handler required for EncodedConn Subscription")
}
argType, numArgs := argInfo(cb)
if argType == nil {
return nil, errors.New("nats: Handler requires at least one argument")
}
cbValue := reflect.ValueOf(cb)
wantsRaw := (argType == emptyMsgType)
natsCB := func(m *Msg) {
var oV []reflect.Value
if wantsRaw {
oV = []reflect.Value{reflect.ValueOf(m)}
} else {
var oPtr reflect.Value
if argType.Kind() != reflect.Ptr {
oPtr = reflect.New(argType)
} else {
oPtr = reflect.New(argType.Elem())
}
if err := c.Enc.Decode(m.Subject, m.Data, oPtr.Interface()); err != nil {
if c.Conn.Opts.AsyncErrorCB != nil {
c.Conn.ach <- func() {
c.Conn.Opts.AsyncErrorCB(c.Conn, m.Sub, errors.New("nats: Got an error trying to unmarshal: "+err.Error()))
}
}
return
}
if argType.Kind() != reflect.Ptr {
oPtr = reflect.Indirect(oPtr)
}
// Callback Arity
switch numArgs {
case 1:
oV = []reflect.Value{oPtr}
case 2:
subV := reflect.ValueOf(m.Subject)
oV = []reflect.Value{subV, oPtr}
case 3:
subV := reflect.ValueOf(m.Subject)
replyV := reflect.ValueOf(m.Reply)
oV = []reflect.Value{subV, replyV, oPtr}
}
}
cbValue.Call(oV)
}
return c.Conn.subscribe(subject, queue, natsCB, nil)
}
// FlushTimeout allows a Flush operation to have an associated timeout.
func (c *EncodedConn) FlushTimeout(timeout time.Duration) (err error) {
return c.Conn.FlushTimeout(timeout)
}
// Flush will perform a round trip to the server and return when it
// receives the internal reply.
func (c *EncodedConn) Flush() error {
return c.Conn.Flush()
}
// Close will close the connection to the server. This call will release
// all blocking calls, such as Flush(), etc.
func (c *EncodedConn) Close() {
c.Conn.Close()
}
// LastError reports the last error encountered via the Connection.
func (c *EncodedConn) LastError() error {
return c.Conn.err
}

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package nats_test
import (
"fmt"
"testing"
"time"
. "github.com/nats-io/go-nats"
"github.com/nats-io/go-nats/encoders/protobuf"
"github.com/nats-io/go-nats/encoders/protobuf/testdata"
)
// Since we import above nats packages, we need to have a different
// const name than TEST_PORT that we used on the other packages.
const ENC_TEST_PORT = 8268
var options = Options{
Url: fmt.Sprintf("nats://localhost:%d", ENC_TEST_PORT),
AllowReconnect: true,
MaxReconnect: 10,
ReconnectWait: 100 * time.Millisecond,
Timeout: DefaultTimeout,
}
////////////////////////////////////////////////////////////////////////////////
// Encoded connection tests
////////////////////////////////////////////////////////////////////////////////
func TestPublishErrorAfterSubscribeDecodeError(t *testing.T) {
ts := RunServerOnPort(ENC_TEST_PORT)
defer ts.Shutdown()
opts := options
nc, _ := opts.Connect()
defer nc.Close()
c, _ := NewEncodedConn(nc, JSON_ENCODER)
//Test message type
type Message struct {
Message string
}
const testSubj = "test"
c.Subscribe(testSubj, func(msg *Message) {})
//Publish invalid json to catch decode error in subscription callback
c.Publish(testSubj, `foo`)
c.Flush()
//Next publish should be successful
if err := c.Publish(testSubj, Message{"2"}); err != nil {
t.Error("Fail to send correct json message after decode error in subscription")
}
}
func TestPublishErrorAfterInvalidPublishMessage(t *testing.T) {
ts := RunServerOnPort(ENC_TEST_PORT)
defer ts.Shutdown()
opts := options
nc, _ := opts.Connect()
defer nc.Close()
c, _ := NewEncodedConn(nc, protobuf.PROTOBUF_ENCODER)
const testSubj = "test"
c.Publish(testSubj, &testdata.Person{Name: "Anatolii"})
//Publish invalid protobuff message to catch decode error
c.Publish(testSubj, "foo")
//Next publish with valid protobuf message should be successful
if err := c.Publish(testSubj, &testdata.Person{Name: "Anatolii"}); err != nil {
t.Error("Fail to send correct protobuf message after invalid message publishing", err)
}
}
func TestVariousFailureConditions(t *testing.T) {
ts := RunServerOnPort(ENC_TEST_PORT)
defer ts.Shutdown()
dch := make(chan bool)
opts := options
opts.AsyncErrorCB = func(_ *Conn, _ *Subscription, e error) {
dch <- true
}
nc, _ := opts.Connect()
nc.Close()
if _, err := NewEncodedConn(nil, protobuf.PROTOBUF_ENCODER); err == nil {
t.Fatal("Expected an error")
}
if _, err := NewEncodedConn(nc, protobuf.PROTOBUF_ENCODER); err == nil || err != ErrConnectionClosed {
t.Fatalf("Wrong error: %v instead of %v", err, ErrConnectionClosed)
}
nc, _ = opts.Connect()
defer nc.Close()
if _, err := NewEncodedConn(nc, "foo"); err == nil {
t.Fatal("Expected an error")
}
c, err := NewEncodedConn(nc, protobuf.PROTOBUF_ENCODER)
if err != nil {
t.Fatalf("Unable to create encoded connection: %v", err)
}
defer c.Close()
if _, err := c.Subscribe("bar", func(subj, obj string) {}); err != nil {
t.Fatalf("Unable to create subscription: %v", err)
}
if err := c.Publish("bar", &testdata.Person{Name: "Ivan"}); err != nil {
t.Fatalf("Unable to publish: %v", err)
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get the async error callback")
}
if err := c.PublishRequest("foo", "bar", "foo"); err == nil {
t.Fatal("Expected an error")
}
if err := c.Request("foo", "foo", nil, 2*time.Second); err == nil {
t.Fatal("Expected an error")
}
nc.Close()
if err := c.PublishRequest("foo", "bar", &testdata.Person{Name: "Ivan"}); err == nil {
t.Fatal("Expected an error")
}
resp := &testdata.Person{}
if err := c.Request("foo", &testdata.Person{Name: "Ivan"}, resp, 2*time.Second); err == nil {
t.Fatal("Expected an error")
}
if _, err := c.Subscribe("foo", nil); err == nil {
t.Fatal("Expected an error")
}
if _, err := c.Subscribe("foo", func() {}); err == nil {
t.Fatal("Expected an error")
}
func() {
defer func() {
if r := recover(); r == nil {
t.Fatal("Expected an error")
}
}()
if _, err := c.Subscribe("foo", "bar"); err == nil {
t.Fatal("Expected an error")
}
}()
}
func TestRequest(t *testing.T) {
ts := RunServerOnPort(ENC_TEST_PORT)
defer ts.Shutdown()
dch := make(chan bool)
opts := options
nc, _ := opts.Connect()
defer nc.Close()
c, err := NewEncodedConn(nc, protobuf.PROTOBUF_ENCODER)
if err != nil {
t.Fatalf("Unable to create encoded connection: %v", err)
}
defer c.Close()
sentName := "Ivan"
recvName := "Kozlovic"
if _, err := c.Subscribe("foo", func(_, reply string, p *testdata.Person) {
if p.Name != sentName {
t.Fatalf("Got wrong name: %v instead of %v", p.Name, sentName)
}
c.Publish(reply, &testdata.Person{Name: recvName})
dch <- true
}); err != nil {
t.Fatalf("Unable to create subscription: %v", err)
}
if _, err := c.Subscribe("foo", func(_ string, p *testdata.Person) {
if p.Name != sentName {
t.Fatalf("Got wrong name: %v instead of %v", p.Name, sentName)
}
dch <- true
}); err != nil {
t.Fatalf("Unable to create subscription: %v", err)
}
if err := c.Publish("foo", &testdata.Person{Name: sentName}); err != nil {
t.Fatalf("Unable to publish: %v", err)
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get message")
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get message")
}
response := &testdata.Person{}
if err := c.Request("foo", &testdata.Person{Name: sentName}, response, 2*time.Second); err != nil {
t.Fatalf("Unable to publish: %v", err)
}
if response == nil {
t.Fatal("No response received")
} else if response.Name != recvName {
t.Fatalf("Wrong response: %v instead of %v", response.Name, recvName)
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get message")
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get message")
}
c2, err := NewEncodedConn(nc, GOB_ENCODER)
if err != nil {
t.Fatalf("Unable to create encoded connection: %v", err)
}
defer c2.Close()
if _, err := c2.QueueSubscribe("bar", "baz", func(m *Msg) {
response := &Msg{Subject: m.Reply, Data: []byte(recvName)}
c2.Conn.PublishMsg(response)
dch <- true
}); err != nil {
t.Fatalf("Unable to create subscription: %v", err)
}
mReply := Msg{}
if err := c2.Request("bar", &Msg{Data: []byte(sentName)}, &mReply, 2*time.Second); err != nil {
t.Fatalf("Unable to send request: %v", err)
}
if string(mReply.Data) != recvName {
t.Fatalf("Wrong reply: %v instead of %v", string(mReply.Data), recvName)
}
if err := Wait(dch); err != nil {
t.Fatal("Did not get message")
}
if c.LastError() != nil {
t.Fatalf("Unexpected connection error: %v", c.LastError())
}
if c2.LastError() != nil {
t.Fatalf("Unexpected connection error: %v", c2.LastError())
}
}

266
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package nats_test
import (
"fmt"
"time"
"github.com/nats-io/go-nats"
)
// Shows different ways to create a Conn
func ExampleConnect() {
nc, _ := nats.Connect(nats.DefaultURL)
nc.Close()
nc, _ = nats.Connect("nats://derek:secretpassword@demo.nats.io:4222")
nc.Close()
nc, _ = nats.Connect("tls://derek:secretpassword@demo.nats.io:4443")
nc.Close()
opts := nats.Options{
AllowReconnect: true,
MaxReconnect: 10,
ReconnectWait: 5 * time.Second,
Timeout: 1 * time.Second,
}
nc, _ = opts.Connect()
nc.Close()
}
// This Example shows an asynchronous subscriber.
func ExampleConn_Subscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Subscribe("foo", func(m *nats.Msg) {
fmt.Printf("Received a message: %s\n", string(m.Data))
})
}
// This Example shows a synchronous subscriber.
func ExampleConn_SubscribeSync() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
sub, _ := nc.SubscribeSync("foo")
m, err := sub.NextMsg(1 * time.Second)
if err == nil {
fmt.Printf("Received a message: %s\n", string(m.Data))
} else {
fmt.Println("NextMsg timed out.")
}
}
func ExampleSubscription_NextMsg() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
sub, _ := nc.SubscribeSync("foo")
m, err := sub.NextMsg(1 * time.Second)
if err == nil {
fmt.Printf("Received a message: %s\n", string(m.Data))
} else {
fmt.Println("NextMsg timed out.")
}
}
func ExampleSubscription_Unsubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
sub, _ := nc.SubscribeSync("foo")
// ...
sub.Unsubscribe()
}
func ExampleConn_Publish() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Publish("foo", []byte("Hello World!"))
}
func ExampleConn_PublishMsg() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
msg := &nats.Msg{Subject: "foo", Reply: "bar", Data: []byte("Hello World!")}
nc.PublishMsg(msg)
}
func ExampleConn_Flush() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
msg := &nats.Msg{Subject: "foo", Reply: "bar", Data: []byte("Hello World!")}
for i := 0; i < 1000; i++ {
nc.PublishMsg(msg)
}
err := nc.Flush()
if err == nil {
// Everything has been processed by the server for nc *Conn.
}
}
func ExampleConn_FlushTimeout() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
msg := &nats.Msg{Subject: "foo", Reply: "bar", Data: []byte("Hello World!")}
for i := 0; i < 1000; i++ {
nc.PublishMsg(msg)
}
// Only wait for up to 1 second for Flush
err := nc.FlushTimeout(1 * time.Second)
if err == nil {
// Everything has been processed by the server for nc *Conn.
}
}
func ExampleConn_Request() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Subscribe("foo", func(m *nats.Msg) {
nc.Publish(m.Reply, []byte("I will help you"))
})
nc.Request("foo", []byte("help"), 50*time.Millisecond)
}
func ExampleConn_QueueSubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
received := 0
nc.QueueSubscribe("foo", "worker_group", func(_ *nats.Msg) {
received++
})
}
func ExampleSubscription_AutoUnsubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
received, wanted, total := 0, 10, 100
sub, _ := nc.Subscribe("foo", func(_ *nats.Msg) {
received++
})
sub.AutoUnsubscribe(wanted)
for i := 0; i < total; i++ {
nc.Publish("foo", []byte("Hello"))
}
nc.Flush()
fmt.Printf("Received = %d", received)
}
func ExampleConn_Close() {
nc, _ := nats.Connect(nats.DefaultURL)
nc.Close()
}
// Shows how to wrap a Conn into an EncodedConn
func ExampleNewEncodedConn() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
c.Close()
}
// EncodedConn can publish virtually anything just
// by passing it in. The encoder will be used to properly
// encode the raw Go type
func ExampleEncodedConn_Publish() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
}
// EncodedConn's subscribers will automatically decode the
// wire data into the requested Go type using the Decode()
// method of the registered Encoder. The callback signature
// can also vary to include additional data, such as subject
// and reply subjects.
func ExampleEncodedConn_Subscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
c.Subscribe("hello", func(p *person) {
fmt.Printf("Received a person! %+v\n", p)
})
c.Subscribe("hello", func(subj, reply string, p *person) {
fmt.Printf("Received a person on subject %s! %+v\n", subj, p)
})
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
}
// BindSendChan() allows binding of a Go channel to a nats
// subject for publish operations. The Encoder attached to the
// EncodedConn will be used for marshaling.
func ExampleEncodedConn_BindSendChan() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
ch := make(chan *person)
c.BindSendChan("hello", ch)
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
ch <- me
}
// BindRecvChan() allows binding of a Go channel to a nats
// subject for subscribe operations. The Encoder attached to the
// EncodedConn will be used for un-marshaling.
func ExampleEncodedConn_BindRecvChan() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
ch := make(chan *person)
c.BindRecvChan("hello", ch)
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
// Receive the publish directly on a channel
who := <-ch
fmt.Printf("%v says hello!\n", who)
}

2980
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vendor/github.com/nats-io/go-nats/nats_test.go generated vendored Normal file
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// Copyright 2013-2017 Apcera Inc. All rights reserved.
package nats
import (
"errors"
"reflect"
)
// This allows the functionality for network channels by binding send and receive Go chans
// to subjects and optionally queue groups.
// Data will be encoded and decoded via the EncodedConn and its associated encoders.
// BindSendChan binds a channel for send operations to NATS.
func (c *EncodedConn) BindSendChan(subject string, channel interface{}) error {
chVal := reflect.ValueOf(channel)
if chVal.Kind() != reflect.Chan {
return ErrChanArg
}
go chPublish(c, chVal, subject)
return nil
}
// Publish all values that arrive on the channel until it is closed or we
// encounter an error.
func chPublish(c *EncodedConn, chVal reflect.Value, subject string) {
for {
val, ok := chVal.Recv()
if !ok {
// Channel has most likely been closed.
return
}
if e := c.Publish(subject, val.Interface()); e != nil {
// Do this under lock.
c.Conn.mu.Lock()
defer c.Conn.mu.Unlock()
if c.Conn.Opts.AsyncErrorCB != nil {
// FIXME(dlc) - Not sure this is the right thing to do.
// FIXME(ivan) - If the connection is not yet closed, try to schedule the callback
if c.Conn.isClosed() {
go c.Conn.Opts.AsyncErrorCB(c.Conn, nil, e)
} else {
c.Conn.ach <- func() { c.Conn.Opts.AsyncErrorCB(c.Conn, nil, e) }
}
}
return
}
}
}
// BindRecvChan binds a channel for receive operations from NATS.
func (c *EncodedConn) BindRecvChan(subject string, channel interface{}) (*Subscription, error) {
return c.bindRecvChan(subject, _EMPTY_, channel)
}
// BindRecvQueueChan binds a channel for queue-based receive operations from NATS.
func (c *EncodedConn) BindRecvQueueChan(subject, queue string, channel interface{}) (*Subscription, error) {
return c.bindRecvChan(subject, queue, channel)
}
// Internal function to bind receive operations for a channel.
func (c *EncodedConn) bindRecvChan(subject, queue string, channel interface{}) (*Subscription, error) {
chVal := reflect.ValueOf(channel)
if chVal.Kind() != reflect.Chan {
return nil, ErrChanArg
}
argType := chVal.Type().Elem()
cb := func(m *Msg) {
var oPtr reflect.Value
if argType.Kind() != reflect.Ptr {
oPtr = reflect.New(argType)
} else {
oPtr = reflect.New(argType.Elem())
}
if err := c.Enc.Decode(m.Subject, m.Data, oPtr.Interface()); err != nil {
c.Conn.err = errors.New("nats: Got an error trying to unmarshal: " + err.Error())
if c.Conn.Opts.AsyncErrorCB != nil {
c.Conn.ach <- func() { c.Conn.Opts.AsyncErrorCB(c.Conn, m.Sub, c.Conn.err) }
}
return
}
if argType.Kind() != reflect.Ptr {
oPtr = reflect.Indirect(oPtr)
}
// This is a bit hacky, but in this instance we may be trying to send to a closed channel.
// and the user does not know when it is safe to close the channel.
defer func() {
// If we have panicked, recover and close the subscription.
if r := recover(); r != nil {
m.Sub.Unsubscribe()
}
}()
// Actually do the send to the channel.
chVal.Send(oPtr)
}
return c.Conn.subscribe(subject, queue, cb, nil)
}

470
vendor/github.com/nats-io/go-nats/parser.go generated vendored Normal file
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// Copyright 2012-2017 Apcera Inc. All rights reserved.
package nats
import (
"fmt"
)
type msgArg struct {
subject []byte
reply []byte
sid int64
size int
}
const MAX_CONTROL_LINE_SIZE = 1024
type parseState struct {
state int
as int
drop int
ma msgArg
argBuf []byte
msgBuf []byte
scratch [MAX_CONTROL_LINE_SIZE]byte
}
const (
OP_START = iota
OP_PLUS
OP_PLUS_O
OP_PLUS_OK
OP_MINUS
OP_MINUS_E
OP_MINUS_ER
OP_MINUS_ERR
OP_MINUS_ERR_SPC
MINUS_ERR_ARG
OP_M
OP_MS
OP_MSG
OP_MSG_SPC
MSG_ARG
MSG_PAYLOAD
MSG_END
OP_P
OP_PI
OP_PIN
OP_PING
OP_PO
OP_PON
OP_PONG
OP_I
OP_IN
OP_INF
OP_INFO
OP_INFO_SPC
INFO_ARG
)
// parse is the fast protocol parser engine.
func (nc *Conn) parse(buf []byte) error {
var i int
var b byte
// Move to loop instead of range syntax to allow jumping of i
for i = 0; i < len(buf); i++ {
b = buf[i]
switch nc.ps.state {
case OP_START:
switch b {
case 'M', 'm':
nc.ps.state = OP_M
case 'P', 'p':
nc.ps.state = OP_P
case '+':
nc.ps.state = OP_PLUS
case '-':
nc.ps.state = OP_MINUS
case 'I', 'i':
nc.ps.state = OP_I
default:
goto parseErr
}
case OP_M:
switch b {
case 'S', 's':
nc.ps.state = OP_MS
default:
goto parseErr
}
case OP_MS:
switch b {
case 'G', 'g':
nc.ps.state = OP_MSG
default:
goto parseErr
}
case OP_MSG:
switch b {
case ' ', '\t':
nc.ps.state = OP_MSG_SPC
default:
goto parseErr
}
case OP_MSG_SPC:
switch b {
case ' ', '\t':
continue
default:
nc.ps.state = MSG_ARG
nc.ps.as = i
}
case MSG_ARG:
switch b {
case '\r':
nc.ps.drop = 1
case '\n':
var arg []byte
if nc.ps.argBuf != nil {
arg = nc.ps.argBuf
} else {
arg = buf[nc.ps.as : i-nc.ps.drop]
}
if err := nc.processMsgArgs(arg); err != nil {
return err
}
nc.ps.drop, nc.ps.as, nc.ps.state = 0, i+1, MSG_PAYLOAD
// jump ahead with the index. If this overruns
// what is left we fall out and process split
// buffer.
i = nc.ps.as + nc.ps.ma.size - 1
default:
if nc.ps.argBuf != nil {
nc.ps.argBuf = append(nc.ps.argBuf, b)
}
}
case MSG_PAYLOAD:
if nc.ps.msgBuf != nil {
if len(nc.ps.msgBuf) >= nc.ps.ma.size {
nc.processMsg(nc.ps.msgBuf)
nc.ps.argBuf, nc.ps.msgBuf, nc.ps.state = nil, nil, MSG_END
} else {
// copy as much as we can to the buffer and skip ahead.
toCopy := nc.ps.ma.size - len(nc.ps.msgBuf)
avail := len(buf) - i
if avail < toCopy {
toCopy = avail
}
if toCopy > 0 {
start := len(nc.ps.msgBuf)
// This is needed for copy to work.
nc.ps.msgBuf = nc.ps.msgBuf[:start+toCopy]
copy(nc.ps.msgBuf[start:], buf[i:i+toCopy])
// Update our index
i = (i + toCopy) - 1
} else {
nc.ps.msgBuf = append(nc.ps.msgBuf, b)
}
}
} else if i-nc.ps.as >= nc.ps.ma.size {
nc.processMsg(buf[nc.ps.as:i])
nc.ps.argBuf, nc.ps.msgBuf, nc.ps.state = nil, nil, MSG_END
}
case MSG_END:
switch b {
case '\n':
nc.ps.drop, nc.ps.as, nc.ps.state = 0, i+1, OP_START
default:
continue
}
case OP_PLUS:
switch b {
case 'O', 'o':
nc.ps.state = OP_PLUS_O
default:
goto parseErr
}
case OP_PLUS_O:
switch b {
case 'K', 'k':
nc.ps.state = OP_PLUS_OK
default:
goto parseErr
}
case OP_PLUS_OK:
switch b {
case '\n':
nc.processOK()
nc.ps.drop, nc.ps.state = 0, OP_START
}
case OP_MINUS:
switch b {
case 'E', 'e':
nc.ps.state = OP_MINUS_E
default:
goto parseErr
}
case OP_MINUS_E:
switch b {
case 'R', 'r':
nc.ps.state = OP_MINUS_ER
default:
goto parseErr
}
case OP_MINUS_ER:
switch b {
case 'R', 'r':
nc.ps.state = OP_MINUS_ERR
default:
goto parseErr
}
case OP_MINUS_ERR:
switch b {
case ' ', '\t':
nc.ps.state = OP_MINUS_ERR_SPC
default:
goto parseErr
}
case OP_MINUS_ERR_SPC:
switch b {
case ' ', '\t':
continue
default:
nc.ps.state = MINUS_ERR_ARG
nc.ps.as = i
}
case MINUS_ERR_ARG:
switch b {
case '\r':
nc.ps.drop = 1
case '\n':
var arg []byte
if nc.ps.argBuf != nil {
arg = nc.ps.argBuf
nc.ps.argBuf = nil
} else {
arg = buf[nc.ps.as : i-nc.ps.drop]
}
nc.processErr(string(arg))
nc.ps.drop, nc.ps.as, nc.ps.state = 0, i+1, OP_START
default:
if nc.ps.argBuf != nil {
nc.ps.argBuf = append(nc.ps.argBuf, b)
}
}
case OP_P:
switch b {
case 'I', 'i':
nc.ps.state = OP_PI
case 'O', 'o':
nc.ps.state = OP_PO
default:
goto parseErr
}
case OP_PO:
switch b {
case 'N', 'n':
nc.ps.state = OP_PON
default:
goto parseErr
}
case OP_PON:
switch b {
case 'G', 'g':
nc.ps.state = OP_PONG
default:
goto parseErr
}
case OP_PONG:
switch b {
case '\n':
nc.processPong()
nc.ps.drop, nc.ps.state = 0, OP_START
}
case OP_PI:
switch b {
case 'N', 'n':
nc.ps.state = OP_PIN
default:
goto parseErr
}
case OP_PIN:
switch b {
case 'G', 'g':
nc.ps.state = OP_PING
default:
goto parseErr
}
case OP_PING:
switch b {
case '\n':
nc.processPing()
nc.ps.drop, nc.ps.state = 0, OP_START
}
case OP_I:
switch b {
case 'N', 'n':
nc.ps.state = OP_IN
default:
goto parseErr
}
case OP_IN:
switch b {
case 'F', 'f':
nc.ps.state = OP_INF
default:
goto parseErr
}
case OP_INF:
switch b {
case 'O', 'o':
nc.ps.state = OP_INFO
default:
goto parseErr
}
case OP_INFO:
switch b {
case ' ', '\t':
nc.ps.state = OP_INFO_SPC
default:
goto parseErr
}
case OP_INFO_SPC:
switch b {
case ' ', '\t':
continue
default:
nc.ps.state = INFO_ARG
nc.ps.as = i
}
case INFO_ARG:
switch b {
case '\r':
nc.ps.drop = 1
case '\n':
var arg []byte
if nc.ps.argBuf != nil {
arg = nc.ps.argBuf
nc.ps.argBuf = nil
} else {
arg = buf[nc.ps.as : i-nc.ps.drop]
}
nc.processAsyncInfo(arg)
nc.ps.drop, nc.ps.as, nc.ps.state = 0, i+1, OP_START
default:
if nc.ps.argBuf != nil {
nc.ps.argBuf = append(nc.ps.argBuf, b)
}
}
default:
goto parseErr
}
}
// Check for split buffer scenarios
if (nc.ps.state == MSG_ARG || nc.ps.state == MINUS_ERR_ARG || nc.ps.state == INFO_ARG) && nc.ps.argBuf == nil {
nc.ps.argBuf = nc.ps.scratch[:0]
nc.ps.argBuf = append(nc.ps.argBuf, buf[nc.ps.as:i-nc.ps.drop]...)
// FIXME, check max len
}
// Check for split msg
if nc.ps.state == MSG_PAYLOAD && nc.ps.msgBuf == nil {
// We need to clone the msgArg if it is still referencing the
// read buffer and we are not able to process the msg.
if nc.ps.argBuf == nil {
nc.cloneMsgArg()
}
// If we will overflow the scratch buffer, just create a
// new buffer to hold the split message.
if nc.ps.ma.size > cap(nc.ps.scratch)-len(nc.ps.argBuf) {
lrem := len(buf[nc.ps.as:])
nc.ps.msgBuf = make([]byte, lrem, nc.ps.ma.size)
copy(nc.ps.msgBuf, buf[nc.ps.as:])
} else {
nc.ps.msgBuf = nc.ps.scratch[len(nc.ps.argBuf):len(nc.ps.argBuf)]
nc.ps.msgBuf = append(nc.ps.msgBuf, (buf[nc.ps.as:])...)
}
}
return nil
parseErr:
return fmt.Errorf("nats: Parse Error [%d]: '%s'", nc.ps.state, buf[i:])
}
// cloneMsgArg is used when the split buffer scenario has the pubArg in the existing read buffer, but
// we need to hold onto it into the next read.
func (nc *Conn) cloneMsgArg() {
nc.ps.argBuf = nc.ps.scratch[:0]
nc.ps.argBuf = append(nc.ps.argBuf, nc.ps.ma.subject...)
nc.ps.argBuf = append(nc.ps.argBuf, nc.ps.ma.reply...)
nc.ps.ma.subject = nc.ps.argBuf[:len(nc.ps.ma.subject)]
if nc.ps.ma.reply != nil {
nc.ps.ma.reply = nc.ps.argBuf[len(nc.ps.ma.subject):]
}
}
const argsLenMax = 4
func (nc *Conn) processMsgArgs(arg []byte) error {
// Unroll splitArgs to avoid runtime/heap issues
a := [argsLenMax][]byte{}
args := a[:0]
start := -1
for i, b := range arg {
switch b {
case ' ', '\t', '\r', '\n':
if start >= 0 {
args = append(args, arg[start:i])
start = -1
}
default:
if start < 0 {
start = i
}
}
}
if start >= 0 {
args = append(args, arg[start:])
}
switch len(args) {
case 3:
nc.ps.ma.subject = args[0]
nc.ps.ma.sid = parseInt64(args[1])
nc.ps.ma.reply = nil
nc.ps.ma.size = int(parseInt64(args[2]))
case 4:
nc.ps.ma.subject = args[0]
nc.ps.ma.sid = parseInt64(args[1])
nc.ps.ma.reply = args[2]
nc.ps.ma.size = int(parseInt64(args[3]))
default:
return fmt.Errorf("nats: processMsgArgs Parse Error: '%s'", arg)
}
if nc.ps.ma.sid < 0 {
return fmt.Errorf("nats: processMsgArgs Bad or Missing Sid: '%s'", arg)
}
if nc.ps.ma.size < 0 {
return fmt.Errorf("nats: processMsgArgs Bad or Missing Size: '%s'", arg)
}
return nil
}
// Ascii numbers 0-9
const (
ascii_0 = 48
ascii_9 = 57
)
// parseInt64 expects decimal positive numbers. We
// return -1 to signal error
func parseInt64(d []byte) (n int64) {
if len(d) == 0 {
return -1
}
for _, dec := range d {
if dec < ascii_0 || dec > ascii_9 {
return -1
}
n = n*10 + (int64(dec) - ascii_0)
}
return n
}

4
vendor/github.com/nats-io/go-nats/staticcheck.ignore generated vendored Normal file
View File

@ -0,0 +1,4 @@
github.com/nats-io/go-nats/*_test.go:SA2002
github.com/nats-io/go-nats/*/*_test.go:SA2002
github.com/nats-io/go-nats/test/context_test.go:SA1012
github.com/nats-io/go-nats/nats.go:SA6000

43
vendor/github.com/nats-io/go-nats/timer.go generated vendored Normal file
View File

@ -0,0 +1,43 @@
package nats
import (
"sync"
"time"
)
// global pool of *time.Timer's. can be used by multiple goroutines concurrently.
var globalTimerPool timerPool
// timerPool provides GC-able pooling of *time.Timer's.
// can be used by multiple goroutines concurrently.
type timerPool struct {
p sync.Pool
}
// Get returns a timer that completes after the given duration.
func (tp *timerPool) Get(d time.Duration) *time.Timer {
if t, _ := tp.p.Get().(*time.Timer); t != nil {
t.Reset(d)
return t
}
return time.NewTimer(d)
}
// Put pools the given timer.
//
// There is no need to call t.Stop() before calling Put.
//
// Put will try to stop the timer before pooling. If the
// given timer already expired, Put will read the unreceived
// value if there is one.
func (tp *timerPool) Put(t *time.Timer) {
if !t.Stop() {
select {
case <-t.C:
default:
}
}
tp.p.Put(t)
}

29
vendor/github.com/nats-io/go-nats/timer_test.go generated vendored Normal file
View File

@ -0,0 +1,29 @@
package nats
import (
"testing"
"time"
)
func TestTimerPool(t *testing.T) {
var tp timerPool
for i := 0; i < 10; i++ {
tm := tp.Get(time.Millisecond * 20)
select {
case <-tm.C:
t.Errorf("Timer already expired")
continue
default:
}
select {
case <-tm.C:
case <-time.After(time.Millisecond * 100):
t.Errorf("Timer didn't expire in time")
}
tp.Put(tm)
}
}

13
vendor/vendor.json vendored Normal file
View File

@ -0,0 +1,13 @@
{
"comment": "",
"ignore": "",
"package": [
{
"checksumSHA1": "nWIa0L7ux21Cb8kzB4rJHXMblpI=",
"path": "github.com/nats-io/go-nats",
"revision": "f0d9c5988d4c2a17ad466fcdffe010165c46434e",
"revisionTime": "2017-11-14T23:23:38Z"
}
],
"rootPath": "github.com/tidwall/tile38"
}