59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
|
|
// See LICENSE for copying information.
|
|
|
|
package drpcctx
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
|
|
"storj.io/drpc"
|
|
)
|
|
|
|
type transportKey struct{}
|
|
|
|
// WithTransport associates the drpc.Transport as a value on the context.
|
|
func WithTransport(ctx context.Context, tr drpc.Transport) context.Context {
|
|
return context.WithValue(ctx, transportKey{}, tr)
|
|
}
|
|
|
|
// Transport returns the drpc.Transport associated with the context and a bool if it
|
|
// existed.
|
|
func Transport(ctx context.Context) (drpc.Transport, bool) {
|
|
tr, ok := ctx.Value(transportKey{}).(drpc.Transport)
|
|
return tr, ok
|
|
}
|
|
|
|
// Tracker keeps track of launched goroutines with a context.
|
|
type Tracker struct {
|
|
context.Context
|
|
cancel func()
|
|
wg sync.WaitGroup
|
|
}
|
|
|
|
// NewTracker creates a Tracker bound to the provided context.
|
|
func NewTracker(ctx context.Context) *Tracker {
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
return &Tracker{
|
|
Context: ctx,
|
|
cancel: cancel,
|
|
}
|
|
}
|
|
|
|
// Run starts a goroutine running the callback with the tracker as the context.
|
|
func (t *Tracker) Run(cb func(ctx context.Context)) {
|
|
t.wg.Add(1)
|
|
go t.track(cb)
|
|
}
|
|
|
|
// track is a helper to call done on the waitgroup after the callback returns.
|
|
func (t *Tracker) track(cb func(ctx context.Context)) {
|
|
cb(t)
|
|
t.wg.Done()
|
|
}
|
|
|
|
// Cancel cancels the tracker's context.
|
|
func (t *Tracker) Cancel() { t.cancel() }
|
|
|
|
// Wait blocks until all callbacks started with Run have exited.
|
|
func (t *Tracker) Wait() { t.wg.Wait() }
|