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394 lines
10 KiB
Go
394 lines
10 KiB
Go
package nsq
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import (
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"fmt"
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"log"
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"os"
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"sync"
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"sync/atomic"
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"time"
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)
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type producerConn interface {
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String() string
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SetLogger(logger, LogLevel, string)
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Connect() (*IdentifyResponse, error)
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Close() error
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WriteCommand(*Command) error
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}
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// Producer is a high-level type to publish to NSQ.
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//
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// A Producer instance is 1:1 with a destination `nsqd`
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// and will lazily connect to that instance (and re-connect)
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// when Publish commands are executed.
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type Producer struct {
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id int64
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addr string
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conn producerConn
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config Config
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logger logger
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logLvl LogLevel
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logGuard sync.RWMutex
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responseChan chan []byte
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errorChan chan []byte
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closeChan chan int
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transactionChan chan *ProducerTransaction
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transactions []*ProducerTransaction
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state int32
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concurrentProducers int32
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stopFlag int32
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exitChan chan int
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wg sync.WaitGroup
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guard sync.Mutex
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}
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// ProducerTransaction is returned by the async publish methods
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// to retrieve metadata about the command after the
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// response is received.
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type ProducerTransaction struct {
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cmd *Command
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doneChan chan *ProducerTransaction
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Error error // the error (or nil) of the publish command
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Args []interface{} // the slice of variadic arguments passed to PublishAsync or MultiPublishAsync
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}
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func (t *ProducerTransaction) finish() {
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if t.doneChan != nil {
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t.doneChan <- t
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}
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}
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// NewProducer returns an instance of Producer for the specified address
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//
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// The only valid way to create a Config is via NewConfig, using a struct literal will panic.
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// After Config is passed into NewProducer the values are no longer mutable (they are copied).
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func NewProducer(addr string, config *Config) (*Producer, error) {
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config.assertInitialized()
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err := config.Validate()
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if err != nil {
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return nil, err
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}
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p := &Producer{
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id: atomic.AddInt64(&instCount, 1),
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addr: addr,
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config: *config,
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logger: log.New(os.Stderr, "", log.Flags()),
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logLvl: LogLevelInfo,
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transactionChan: make(chan *ProducerTransaction),
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exitChan: make(chan int),
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responseChan: make(chan []byte),
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errorChan: make(chan []byte),
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}
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return p, nil
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}
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// Ping causes the Producer to connect to it's configured nsqd (if not already
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// connected) and send a `Nop` command, returning any error that might occur.
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//
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// This method can be used to verify that a newly-created Producer instance is
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// configured correctly, rather than relying on the lazy "connect on Publish"
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// behavior of a Producer.
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func (w *Producer) Ping() error {
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if atomic.LoadInt32(&w.state) != StateConnected {
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err := w.connect()
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if err != nil {
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return err
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}
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}
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return w.conn.WriteCommand(Nop())
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}
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// SetLogger assigns the logger to use as well as a level
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//
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// The logger parameter is an interface that requires the following
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// method to be implemented (such as the the stdlib log.Logger):
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//
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// Output(calldepth int, s string)
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//
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func (w *Producer) SetLogger(l logger, lvl LogLevel) {
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w.logGuard.Lock()
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defer w.logGuard.Unlock()
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w.logger = l
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w.logLvl = lvl
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}
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func (w *Producer) getLogger() (logger, LogLevel) {
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w.logGuard.RLock()
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defer w.logGuard.RUnlock()
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return w.logger, w.logLvl
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}
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// String returns the address of the Producer
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func (w *Producer) String() string {
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return w.addr
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}
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// Stop initiates a graceful stop of the Producer (permanent)
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//
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// NOTE: this blocks until completion
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func (w *Producer) Stop() {
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w.guard.Lock()
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if !atomic.CompareAndSwapInt32(&w.stopFlag, 0, 1) {
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w.guard.Unlock()
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return
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}
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w.log(LogLevelInfo, "stopping")
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close(w.exitChan)
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w.close()
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w.guard.Unlock()
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w.wg.Wait()
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}
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// PublishAsync publishes a message body to the specified topic
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// but does not wait for the response from `nsqd`.
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//
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// When the Producer eventually receives the response from `nsqd`,
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// the supplied `doneChan` (if specified)
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// will receive a `ProducerTransaction` instance with the supplied variadic arguments
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// and the response error if present
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func (w *Producer) PublishAsync(topic string, body []byte, doneChan chan *ProducerTransaction,
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args ...interface{}) error {
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return w.sendCommandAsync(Publish(topic, body), doneChan, args)
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}
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// MultiPublishAsync publishes a slice of message bodies to the specified topic
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// but does not wait for the response from `nsqd`.
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//
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// When the Producer eventually receives the response from `nsqd`,
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// the supplied `doneChan` (if specified)
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// will receive a `ProducerTransaction` instance with the supplied variadic arguments
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// and the response error if present
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func (w *Producer) MultiPublishAsync(topic string, body [][]byte, doneChan chan *ProducerTransaction,
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args ...interface{}) error {
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cmd, err := MultiPublish(topic, body)
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if err != nil {
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return err
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}
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return w.sendCommandAsync(cmd, doneChan, args)
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}
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// Publish synchronously publishes a message body to the specified topic, returning
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// an error if publish failed
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func (w *Producer) Publish(topic string, body []byte) error {
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return w.sendCommand(Publish(topic, body))
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}
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// MultiPublish synchronously publishes a slice of message bodies to the specified topic, returning
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// an error if publish failed
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func (w *Producer) MultiPublish(topic string, body [][]byte) error {
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cmd, err := MultiPublish(topic, body)
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if err != nil {
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return err
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}
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return w.sendCommand(cmd)
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}
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// DeferredPublish synchronously publishes a message body to the specified topic
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// where the message will queue at the channel level until the timeout expires, returning
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// an error if publish failed
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func (w *Producer) DeferredPublish(topic string, delay time.Duration, body []byte) error {
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return w.sendCommand(DeferredPublish(topic, delay, body))
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}
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// DeferredPublishAsync publishes a message body to the specified topic
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// where the message will queue at the channel level until the timeout expires
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// but does not wait for the response from `nsqd`.
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//
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// When the Producer eventually receives the response from `nsqd`,
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// the supplied `doneChan` (if specified)
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// will receive a `ProducerTransaction` instance with the supplied variadic arguments
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// and the response error if present
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func (w *Producer) DeferredPublishAsync(topic string, delay time.Duration, body []byte,
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doneChan chan *ProducerTransaction, args ...interface{}) error {
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return w.sendCommandAsync(DeferredPublish(topic, delay, body), doneChan, args)
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}
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func (w *Producer) sendCommand(cmd *Command) error {
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doneChan := make(chan *ProducerTransaction)
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err := w.sendCommandAsync(cmd, doneChan, nil)
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if err != nil {
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close(doneChan)
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return err
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}
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t := <-doneChan
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return t.Error
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}
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func (w *Producer) sendCommandAsync(cmd *Command, doneChan chan *ProducerTransaction,
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args []interface{}) error {
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// keep track of how many outstanding producers we're dealing with
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// in order to later ensure that we clean them all up...
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atomic.AddInt32(&w.concurrentProducers, 1)
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defer atomic.AddInt32(&w.concurrentProducers, -1)
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if atomic.LoadInt32(&w.state) != StateConnected {
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err := w.connect()
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if err != nil {
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return err
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}
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}
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t := &ProducerTransaction{
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cmd: cmd,
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doneChan: doneChan,
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Args: args,
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}
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select {
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case w.transactionChan <- t:
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case <-w.exitChan:
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return ErrStopped
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}
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return nil
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}
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func (w *Producer) connect() error {
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w.guard.Lock()
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defer w.guard.Unlock()
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if atomic.LoadInt32(&w.stopFlag) == 1 {
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return ErrStopped
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}
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switch state := atomic.LoadInt32(&w.state); state {
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case StateInit:
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case StateConnected:
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return nil
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default:
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return ErrNotConnected
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}
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w.log(LogLevelInfo, "(%s) connecting to nsqd", w.addr)
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logger, logLvl := w.getLogger()
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w.conn = NewConn(w.addr, &w.config, &producerConnDelegate{w})
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w.conn.SetLogger(logger, logLvl, fmt.Sprintf("%3d (%%s)", w.id))
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_, err := w.conn.Connect()
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if err != nil {
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w.conn.Close()
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w.log(LogLevelError, "(%s) error connecting to nsqd - %s", w.addr, err)
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return err
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}
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atomic.StoreInt32(&w.state, StateConnected)
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w.closeChan = make(chan int)
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w.wg.Add(1)
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go w.router()
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return nil
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}
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func (w *Producer) close() {
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if !atomic.CompareAndSwapInt32(&w.state, StateConnected, StateDisconnected) {
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return
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}
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w.conn.Close()
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go func() {
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// we need to handle this in a goroutine so we don't
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// block the caller from making progress
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w.wg.Wait()
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atomic.StoreInt32(&w.state, StateInit)
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}()
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}
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func (w *Producer) router() {
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for {
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select {
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case t := <-w.transactionChan:
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w.transactions = append(w.transactions, t)
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err := w.conn.WriteCommand(t.cmd)
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if err != nil {
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w.log(LogLevelError, "(%s) sending command - %s", w.conn.String(), err)
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w.close()
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}
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case data := <-w.responseChan:
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w.popTransaction(FrameTypeResponse, data)
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case data := <-w.errorChan:
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w.popTransaction(FrameTypeError, data)
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case <-w.closeChan:
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goto exit
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case <-w.exitChan:
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goto exit
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}
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}
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exit:
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w.transactionCleanup()
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w.wg.Done()
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w.log(LogLevelInfo, "exiting router")
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}
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func (w *Producer) popTransaction(frameType int32, data []byte) {
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t := w.transactions[0]
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w.transactions = w.transactions[1:]
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if frameType == FrameTypeError {
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t.Error = ErrProtocol{string(data)}
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}
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t.finish()
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}
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func (w *Producer) transactionCleanup() {
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// clean up transactions we can easily account for
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for _, t := range w.transactions {
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t.Error = ErrNotConnected
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t.finish()
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}
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w.transactions = w.transactions[:0]
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// spin and free up any writes that might have raced
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// with the cleanup process (blocked on writing
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// to transactionChan)
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for {
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select {
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case t := <-w.transactionChan:
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t.Error = ErrNotConnected
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t.finish()
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default:
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// keep spinning until there are 0 concurrent producers
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if atomic.LoadInt32(&w.concurrentProducers) == 0 {
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return
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}
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// give the runtime a chance to schedule other racing goroutines
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time.Sleep(5 * time.Millisecond)
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}
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}
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}
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func (w *Producer) log(lvl LogLevel, line string, args ...interface{}) {
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logger, logLvl := w.getLogger()
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if logger == nil {
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return
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}
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if logLvl > lvl {
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return
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}
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logger.Output(2, fmt.Sprintf("%-4s %3d %s", lvl, w.id, fmt.Sprintf(line, args...)))
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}
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func (w *Producer) onConnResponse(c *Conn, data []byte) { w.responseChan <- data }
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func (w *Producer) onConnError(c *Conn, data []byte) { w.errorChan <- data }
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func (w *Producer) onConnHeartbeat(c *Conn) {}
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func (w *Producer) onConnIOError(c *Conn, err error) { w.close() }
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func (w *Producer) onConnClose(c *Conn) {
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w.guard.Lock()
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defer w.guard.Unlock()
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close(w.closeChan)
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}
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