github.com/jackc/puddle

Puddle

Puddle is a tiny generic resource pool library for Go that uses the standard context library to signal cancellation of acquires. It is designed to contain the minimum functionality required for a resource pool. It can be used directly or it can be used as the base for a domain specific resource pool. For example, a database connection pool may use puddle internally and implement health checks and keep-alive behavior without needing to implement any concurrent code of its own.

Features

• Acquire cancellation via context standard library
• Statistics API for monitoring pool pressure
• No dependencies outside of standard library
• High performance
• 100% test coverage

Example Usage

constructor := func(context.Context) (interface{}, error) {
  return net.Dial("tcp", "127.0.0.1:8080")
}
destructor := func(value interface{}) {
  value.(net.Conn).Close()
}
maxPoolSize := 10

pool := puddle.NewPool(constructor, destructor, maxPoolSize)

// Acquire resource from the pool.
res, err := pool.Acquire(context.Background())
if err != nil {
  // ...
}

// Use resource.
_, err = res.Value().(net.Conn).Write([]byte{1})
if err != nil {
  // ...
}

// Release when done.
res.Release()

Status

Puddle v1 is complete. No changes are planned.

• Bug reports and fixes are welcome.
• New features will not be accepted if they can be feasibly implemented in a wrapper.
• Performance optimizations will not be accepted unless the performance issue rises to the level of a bug.

License

MIT