mobile: initial wrappers for mobile support

mobile/context.go

@@ -0,0 +1,81 @@
+// 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 (
+	"time"
+
+	"golang.org/x/net/context"
+)
+
+// Context carries a deadline, a cancelation 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,
+	}
+}