### Documentation and Examples in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This entry highlights documentation updates and improvements to code examples within the go-nsq project, including fixes for descriptions and the addition of signal handling examples.

```go
// go-nsq change log entries for documentation and examples
// #294 - docs: fix producer example (thanks @nikitabuyevich)
// #307 - docs: add exit signal handling to consumer example
// #324 - docs: fix Consumer.SetLogger() description (thanks @gabriel-vasile)
// #271 - godoc for publisher and consumer (thanks @skateinmars)
```

--------------------------------

### Create and Configure nsq.Config

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Demonstrates how to create a new nsq.Config and set configuration options using the `Set` method. This approach allows for flexible configuration, especially when reading from external sources.

```Go
cfg := nsq.NewConfig()
cfg.Set("nsqd_tcp_address", "127.0.0.1:4150")
cfg.Set("max_in_flight", 10)
// Further configuration or validation can be done here
// cfg.Validate()
```

--------------------------------

### Implement nsq.Handler with HandlerFunc

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Demonstrates how to use nsq.HandlerFunc to simplify implementing the nsq.Handler interface for basic message processing. This approach is suitable for straightforward tasks where asynchronous handling is not required.

```go
r, err := nsq.NewConsumer("test_topic", "test_channel", nsq.NewConfig())
if err != nil {
    log.Fatalf(err.Error())
}

r.AddHandler(nsq.HandlerFunc(func(m *nsq.Message) error {
    return doSomeWork(m)
}))

err := r.ConnectToNSQD(nsqdAddr)
if err != nil {
    log.Fatalf(err.Error())
}

<-r.StopChan
```

--------------------------------

### Configure Custom Logger with Log Level

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Illustrates how to set a custom logger for the Consumer or Producer using the standard Go log.Logger interface and specifying a log level. This provides flexibility in controlling logging output.

```go
logger := log.New(os.Stdout, "[nsq] ", log.LstdFlags)
consumer.SetLogger(logger, nsq.LogLevelInfo)
```

--------------------------------

### Producer Publish Error Handling

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Shows the simplified error handling for the Producer's Publish method. Previously, both error and frameType needed checking; now, only the returned error needs to be inspected for success or failure.

```go
err := producer.Publish("topic", []byte("message"))
if err != nil {
    log.Fatalf("Failed to publish message: %v", err)
}
```

--------------------------------

### Requeue Message Without Backoff

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Demonstrates how to requeue a message without triggering the consumer's backoff mechanism. This is useful when a message needs to be retried immediately without penalizing subsequent message processing.

```go
m.RequeueWithoutBackoff()
```

--------------------------------

### Asynchronous Message Handling with nsq.Message Control

Source: https://github.com/nsqio/go-nsq/blob/master/UPGRADING.md

Illustrates advanced asynchronous message handling by disabling auto-response and manually managing message states. This allows for complex workflows where message acknowledgment or requeuing happens later, potentially after external processing.

```go
type myHandler struct {}

func (h *myHandler) HandleMessage(m *nsq.Message) error {
    m.DisableAutoResponse()
    workerChan <- m
    return nil
}

go func() {
    for m := range workerChan {
        err := doSomeWork(m)
        if err != nil {
            m.Requeue(-1)
            continue
        }
        m.Finish()
    }
}()

cfg := nsq.NewConfig()
cfg.MaxInFlight = 1000
r, err := nsq.NewConsumer("test_topic", "test_channel", cfg)
if err != nil {
    log.Fatalf(err.Error())
}
r.AddConcurrentHandlers(&myHandler{}, 20)

err := r.ConnectToNSQD(nsqdAddr)
if err != nil {
    log.Fatalf(err.Error())
}

<-r.StopChan
```

--------------------------------

### Dependency and Build System Updates in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This entry covers updates to project dependencies and the build system, including switching to GitHub Actions for CI and addressing potential snappy deadlocks.

```go
// go-nsq change log entries for dependency and build system updates
// #329/#330 - switch to GitHub Actions for CI
// #203 - switch to golang/snappy (addressing potential snappy related deadlocks)
```

--------------------------------

### Go-nsq: Reader Configure Method

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds a `Configure()` method to the `Reader` for runtime configuration.

```Go
// #14 - add `Reader.Configure()`
```

--------------------------------

### Go-nsq: Snappy/Deflate Feature Negotiation

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Implements feature negotiation for Snappy and Deflate compression.

```Go
// #4 - snappy/deflate feature negotiation
```

--------------------------------

### Go-nsq: Support 64 Character Topic/Channel Names

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Extends support to allow topic and channel names of up to 64 characters.

```Go
// #36 - support 64 character topic/channel names
```

--------------------------------

### TLS Configuration in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This section covers the TLS configuration options introduced in go-nsq, including minimum version settings and certificate/key configurations.

```go
// go-nsq change log entry for TLS configuration
// #102 - TLS min/max config defaults (thanks @twmb)
// #98 - add tls-min-version option (thanks @twmb)
// #75/#77/#78 - add tls-cert and tls-key config options
```

--------------------------------

### Logging and Configuration in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This section details changes related to logging and configuration within go-nsq, including support for separate loggers per level and config initialization checks.

```go
// go-nsq change log entries for logging and configuration
// #275/#281 - support separate Logger for each log level (thanks @crazyweave)
// #283 - remove redundant Config initialized check (thanks @SwanSpouse)
// #155 - config: support `flag.Value` interface
// #138 - fix lint, vet, fmt issues
// #137 - remove `go-simplejson` dependency
// #122 - refactor log level string handling
// #108 - fix potential logger race conditions (thanks @judwhite)
```

--------------------------------

### Go Modules Support in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This entry details the integration of Go Modules support in the go-nsq library, enabling better dependency management for Go projects.

```go
// go-nsq change log entry for go modules support
// #248 - support go modules
```

--------------------------------

### go-nsq go vet TLS.Config Copying

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This entry addresses a go vet issue related to copying TLS configurations in the go-nsq library.

```go
// go-nsq change log entry for go vet TLS.Config copying
// #255 - go vet tls.Config copying (thanks @iaburton)
```

--------------------------------

### go-nsq AUTHORS File and CI Updates

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This snippet notes the addition of an AUTHORS file and the transition to GitHub Actions for Continuous Integration in the go-nsq project.

```go
// go-nsq change log entries for AUTHORS file and CI updates
// #297 - add AUTHORS file
// #329/#330 - switch to GitHub Actions for CI
```

--------------------------------

### Go-nsq: Per-Connection TLS Configuration

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Enables per-connection TLS configuration and setting the ServerName for secure connections to NSQ.

```Go
// #54 - per-connection TLS config and set `ServerName`
```

--------------------------------

### Go-nsq: Add AUTH Support

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Introduces support for the AUTH command, allowing authentication with the NSQ server. This is a significant API change.

```Go
// #35 - AUTH support
```

--------------------------------

### Producer and Consumer Enhancements in go-nsq

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

This entry summarizes various improvements made to the producer and consumer functionalities within the go-nsq library, such as connection handling, RDY count updates, and backoff strategies.

```go
// go-nsq change log entries for producer and consumer enhancements
// #282 - consumer: reduce duplicate RDY (ready) count updates (thanks @andyxning)
// #313 - add Authorization header to lookup queries
// #321 - consumer: fix panic with some invalid lookupd http addresses (thanks @martin-sucha)
// #317 - producer: connect() code-style improvement (thanks @martin-sucha)
// #330 - fix random backoff jitter on 32-bit architectures
// #333 - consumer: re-use http client with keepalives for lookupd requests (thanks @JieTrancender)
// #336 - producer: shutdown logging prefix consistent with other logging (thanks @karalabe)
// #249 - consumer: update RDY when setting MaxInFlight to 0
// #267 - check response message size is positive (thanks @andyxning)
// #270 - set log level (thanks @YongHaoWu)
// #97/#209 - consumer: retry nsqlookupd queries
// #179/#208 - consumer: redistribute RDY when connections are active
// #184/#201 - producer: fix misleading Stop() EOF (thanks @mengskysama)
// #202 - consumer: fix backoff logging
// #175 - consumer: reduce garbage generation in DecodeMessage (thanks @Dieterbe)
// #162 - producer: support `DeferredPublish` (thanks @DanielHeckrath)
// #156 - consumer: prevent data race on RNG
// #147/#150 - consumer: fix application of `max_backoff_duration` (thanks @judwhite)
// #133 - fix `ErrNotConnected` race during `Producer` connection (thanks @jeddenlea)
// #132 - fix `RDY` redistribution after backoff with no connections
// #128 - fix backoff stall when using `RequeueWithoutBackoff`
// #127 - fix handling of connection closing when resuming after backoff (thanks @jnewmano)
// #126 - allow `BackoffStrategy` to be set via flag (thanks @twmb)
// #125 - add pluggable consumer `BackoffStrategy`; add full-jitter strategy (thanks @hden)
// #124 - add `DialTimeout` and `LocalAddr` config (thanks @yashkin)
// #119 - add `Producer.Ping()` method (thanks @zulily)
// #120 - fix `Message` data races on `responded`
// #114 - fix lookupd jitter having no effect (thanks @judwhite)
// #104 - fix reconnect address bug (thanks @ryanslade)
// #106 - fix backoff reconnect deadlock (thanks @ryanslade)
// #107 - fix out-of-bounds error when removing nsqlookupd addresses (thanks @andreas)
// #111 - fix resolved address error in reconnect loop (thanks @twmb)
// #99 - fix `Consumer.Stop()` race and `Producer.Stop()` deadlock (thanks @tylertreat)
// #95 - cleanup panic during `Consumer.Stop()` if handlers are deadlocked
// #93 - expose a way to get `Consumer` runtime stats (thanks @dcarney)
// #94 - allow `#ephemeral` topic names (thanks @jamesgroat)
// #89 - don't spam connection teardown cleanup messages
// #91 - add consumer `DisconnectFrom*`
// #87 - allow `heartbeat_interval` and `output_buffer_timeout` to be disabled
// #86 - pluggable `nsqlookupd` behaviors
// #83 - send `RDY` before `FIN`/`REQ` (forwards compatibility with nsqio/nsq#404)
// #82 - fix panic when conn isn't assigned
```

--------------------------------

### Go-nsq: Send IDENTIFY Command

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Ensures the IDENTIFY command is sent during connection establishment.

```Go
// #127 - send IDENTIFY (missed in #90)
```

--------------------------------

### Go-nsq: Flexible nsqlookupd URL Specification

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Provides more flexible ways to specify nsqlookupd addresses for connecting to the NSQ cluster.

```Go
// #43/#63 - more flexible `nsqlookupd` URL specification
```

--------------------------------

### Go-nsq: Add TOUCH Command

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Introduces the TOUCH command for extending message visibility.

```Go
// #119 - add TOUCH command
```

--------------------------------

### Go-nsq: Support broadcast_address

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds support for the `broadcast_address` option.

```Go
// #177 - support `broadcast_address`
```

--------------------------------

### Go-nsq: TLS Feature Negotiation

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds TLS feature negotiation for secure communication with NSQ.

```Go
// #227 - TLS feature negotiation
```

--------------------------------

### Go-nsq: User Agent String

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Introduces the ability to send a user agent string, which is displayed in nsqadmin.

```Go
// #23 - user agent
```

--------------------------------

### Go-nsq: Reader Logs Disambiguate Topic/Channel

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Improves reader logging by disambiguating topic and channel information.

```Go
// #27 - reader logs disambiguate topic/channel
```

--------------------------------

### Go-nsq: Add Writer

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Introduces the `Writer` type for publishing messages to NSQ.

```Go
// #164/#202/#255 - add `Writer`
```

--------------------------------

### Go-nsq: Channel Sampling Support

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds support for channel sampling, allowing selective consumption of messages.

```Go
// #22 - channel sampling
```

--------------------------------

### Go-nsq: Add Backoff to Reader

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Integrates backoff functionality into the `Reader` for handling temporary connection issues.

```Go
// #16 - add backoff to Reader
```

--------------------------------

### Go-nsq: Support --max-rdy-count Config Option

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds support for the `--max-rdy-count` configuration option on `nsqd`.

```Go
// #175 - support for `nsqd` config option `--max-rdy-count`
```

--------------------------------

### Go-nsq: Refactor Public API

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Significant refactoring of the public API, requiring users to consult the UPGRADING.md file for compatibility information.

```Go
// #30/#38/#39/#42/#45/#46/#48/#51/#52/#65/#70 - refactor public API (see [UPGRADING](UPGRADING.md))
```

--------------------------------

### Go-nsq: Improved Error and Magic Handling

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Enhances the handling of errors and magic numbers during communication.

```Go
// #133 - improved handling of errors/magic
```

--------------------------------

### Go-nsq: Touch Method on Message

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds a `Touch()` method to the `Message` type for extending message visibility.

```Go
// #6 - `Touch()` method on `Message`
```

--------------------------------

### Go-nsq: nsqlookupd Polling Improvements

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Enhances the polling mechanism for `nsqlookupd`.

```Go
// #250 - `nsqlookupd` polling improvements
```

--------------------------------

### Go-nsq: Auto-Reconnect to Hard-coded nsqd

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Enables auto-reconnection to hard-coded `nsqd` addresses.

```Go
// #169 - auto-reconnect to hard-coded `nsqd`
```

--------------------------------

### Go-nsq: Exported Error for Configured nsqlookupd Address

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Returns an exported error when an nsqlookupd address is already configured.

```Go
// #18 - return an exported error when an `nsqlookupd` address is already configured
```

--------------------------------

### Go-nsq: Requeue Method on Message

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Adds a `Requeue()` method to the `Message` type, allowing messages to be requeued.

```Go
// #12 - `Requeue()` method on `Message`
```

--------------------------------

### Go-nsq: Ignore Publish Responses in Writer

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Provides the ability to ignore publish responses in the `Writer`.

```Go
// #9 - ability to ignore publish responses in `Writer`
```

--------------------------------

### Go-nsq: Connection Pool Goroutine Safety

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Ensures goroutine safety for the connection pool.

```Go
// #161 - connection pool goroutine safety
```

--------------------------------

### Go-nsq: MaxBackoffDuration Disables Backoff

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Setting `MaxBackoffDuration` to `0` disables the backoff mechanism.

```Go
// #186 - `MaxBackoffDuration` of `0` disables backoff
```

--------------------------------

### Go-nsq: Use Last RDY Count for IsStarved

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Utilizes the last RDY count for the `IsStarved()` calculation and redistributes RDY state.

```Go
// #169 - use last RDY count for `IsStarved()`; redistribute RDY state
```

--------------------------------

### Go-nsq: Limit IsStarved to Connections with In-flight Messages

Source: https://github.com/nsqio/go-nsq/blob/master/ChangeLog.md

Restricts the `IsStarved()` check to connections that have messages in flight.

```Go
// #243 - limit `IsStarved()` to connections w/ in-flight messages
```

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