plugeth/mobile/context.go

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains all the wrappers from the golang.org/x/net/context package to support
// client side context management on mobile platforms.
package geth
import (
"context"
"time"
)
2019-06-20 09:38:31 +00:00
// Context carries a deadline, a cancellation signal, and other values across API
// boundaries.
type Context struct {
context context.Context
cancel context.CancelFunc
}
// NewContext returns a non-nil, empty Context. It is never canceled, has no
// values, and has no deadline. It is typically used by the main function,
// initialization, and tests, and as the top-level Context for incoming requests.
func NewContext() *Context {
return &Context{
context: context.Background(),
}
}
// WithCancel returns a copy of the original context with cancellation mechanism
// included.
//
// Canceling this context releases resources associated with it, so code should
// call cancel as soon as the operations running in this Context complete.
func (c *Context) WithCancel() *Context {
child, cancel := context.WithCancel(c.context)
return &Context{
context: child,
cancel: cancel,
}
}
// WithDeadline returns a copy of the original context with the deadline adjusted
// to be no later than the specified time.
//
// Canceling this context releases resources associated with it, so code should
// call cancel as soon as the operations running in this Context complete.
func (c *Context) WithDeadline(sec int64, nsec int64) *Context {
child, cancel := context.WithDeadline(c.context, time.Unix(sec, nsec))
return &Context{
context: child,
cancel: cancel,
}
}
// WithTimeout returns a copy of the original context with the deadline adjusted
// to be no later than now + the duration specified.
//
// Canceling this context releases resources associated with it, so code should
// call cancel as soon as the operations running in this Context complete.
func (c *Context) WithTimeout(nsec int64) *Context {
child, cancel := context.WithTimeout(c.context, time.Duration(nsec))
return &Context{
context: child,
cancel: cancel,
}
}