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common.go
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/
common.go
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// Copyright (C) 2021 Storj Labs, Inc.
// See LICENSE for copying information.
package consoleapi
import (
"context"
"sync"
"github.com/zeebo/errs"
)
var (
// ErrUtils - console utils error type.
ErrUtils = errs.Class("console api utils")
)
// ContextChannel is a generic, context-aware channel.
type ContextChannel struct {
mu sync.Mutex
channel chan interface{}
initialized bool
}
// Get waits until a value is sent and returns it, or returns an error if the context has closed.
func (c *ContextChannel) Get(ctx context.Context) (interface{}, error) {
c.initialize()
select {
case val := <-c.channel:
return val, nil
default:
select {
case <-ctx.Done():
return nil, ErrUtils.New("context closed")
case val := <-c.channel:
return val, nil
}
}
}
// Send waits until a value can be sent and sends it, or returns an error if the context has closed.
func (c *ContextChannel) Send(ctx context.Context, val interface{}) error {
c.initialize()
select {
case c.channel <- val:
return nil
default:
select {
case <-ctx.Done():
return ErrUtils.New("context closed")
case c.channel <- val:
return nil
}
}
}
func (c *ContextChannel) initialize() {
c.mu.Lock()
defer c.mu.Unlock()
if c.initialized {
return
}
c.channel = make(chan interface{})
c.initialized = true
}