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60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
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# ringbuffer
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[](https://opensource.org/licenses/MIT) [](http://godoc.org/github.com/smallnest/ringbuffer) [](https://goreportcard.com/report/github.com/smallnest/ringbuffer) [](https://coveralls.io/github/smallnest/ringbuffer?branch=master)
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A circular buffer (ring buffer) in Go, implemented io.ReaderWriter interface
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[](https://github.com/smallnest/ringbuffer)
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# Usage
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```go
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package main
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import (
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"fmt"
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"github.com/smallnest/ringbuffer"
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)
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func main() {
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rb := ringbuffer.New(1024)
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// write
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rb.Write([]byte("abcd"))
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fmt.Println(rb.Length())
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fmt.Println(rb.Free())
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// read
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buf := make([]byte, 4)
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rb.Read(buf)
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fmt.Println(string(buf))
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}
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```
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It is possible to use an existing buffer with by replacing `New` with `NewBuffer`.
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# Blocking vs Non-blocking
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The default behavior of the ring buffer is non-blocking,
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meaning that reads and writes will return immediately with an error if the operation cannot be completed.
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If you want to block when reading or writing, you must enable it:
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```go
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rb := ringbuffer.New(1024).SetBlocking(true)
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```
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Enabling blocking will cause the ring buffer to behave like a buffered [io.Pipe](https://pkg.go.dev/io#Pipe).
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Regular Reads will block until data is available, but not wait for a full buffer.
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Writes will block until there is space available and writes bigger than the buffer will wait for reads to make space.
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`TryRead` and `TryWrite` are still available for non-blocking reads and writes.
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To signify the end of the stream, close the ring buffer from the writer side with `rb.CloseWriter()`
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Either side can use `rb.CloseWithError(err error)` to signal an error and close the ring buffer.
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Any reads or writes will return the error on next call.
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In blocking mode errors are stateful and the same error will be returned until `rb.Reset()` is called.
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