Closes #626, #625

Signed-off-by: Vishal Rana <vr@labstack.com>

context.go

@@ -16,39 +16,14 @@ import (
 
 	"bytes"
 
-	"golang.org/x/net/context"
+	"github.com/labstack/echo/context"
 )
 
 type (
 	// Context represents the context of the current HTTP request. It holds request and
 	// response objects, path, path parameters, data and registered handler.
 	Context interface {
-		// Context returns `net/context.Context`.
-		Context() context.Context
-
-		// SetContext sets `net/context.Context`.
-		SetContext(context.Context)
-
-		// Deadline returns the time when work done on behalf of this context
-		// should be canceled.  Deadline returns ok==false when no deadline is
-		// set.  Successive calls to Deadline return the same results.
-		Deadline() (deadline time.Time, ok bool)
-
-		// Done returns a channel that's closed when work done on behalf of this
-		// context should be canceled.  Done may return nil if this context can
-		// never be canceled.  Successive calls to Done return the same value.
-		Done() <-chan struct{}
-
-		// Err returns a non-nil error value after Done is closed.  Err returns
-		// Canceled if the context was canceled or DeadlineExceeded if the
-		// context's deadline passed.  No other values for Err are defined.
-		// After Done is closed, successive calls to Err return the same value.
-		Err() error
-
-		// Value returns the value associated with this context for key, or nil
-		// if no value is associated with key.  Successive calls to Value with
-		// the same key returns the same result.
-		Value(key interface{}) interface{}
+		context.Context
 
 		// Request returns `engine.Request` interface.
 		Request() engine.Request

context/context.go

@@ -0,0 +1,94 @@
+package context
+
+import "time"
+
+type Context interface {
+	// Deadline returns the time when work done on behalf of this context
+	// should be canceled. Deadline returns ok==false when no deadline is
+	// set. Successive calls to Deadline return the same results.
+	Deadline() (deadline time.Time, ok bool)
+
+	// Done returns a channel that's closed when work done on behalf of this
+	// context should be canceled. Done may return nil if this context can
+	// never be canceled. Successive calls to Done return the same value.
+	//
+	// WithCancel arranges for Done to be closed when cancel is called;
+	// WithDeadline arranges for Done to be closed when the deadline
+	// expires; WithTimeout arranges for Done to be closed when the timeout
+	// elapses.
+	//
+	// Done is provided for use in select statements:
+	//
+	//  // Stream generates values with DoSomething and sends them to out
+	//  // until DoSomething returns an error or ctx.Done is closed.
+	//  func Stream(ctx context.Context, out chan<- Value) error {
+	//  	for {
+	//  		v, err := DoSomething(ctx)
+	//  		if err != nil {
+	//  			return err
+	//  		}
+	//  		select {
+	//  		case <-ctx.Done():
+	//  			return ctx.Err()
+	//  		case out <- v:
+	//  		}
+	//  	}
+	//  }
+	//
+	// See https://blog.golang.org/pipelines for more examples of how to use
+	// a Done channel for cancelation.
+	Done() <-chan struct{}
+
+	// Err returns a non-nil error value after Done is closed. Err returns
+	// Canceled if the context was canceled or DeadlineExceeded if the
+	// context's deadline passed. No other values for Err are defined.
+	// After Done is closed, successive calls to Err return the same value.
+	Err() error
+
+	// Value returns the value associated with this context for key, or nil
+	// if no value is associated with key. Successive calls to Value with
+	// the same key returns the same result.
+	//
+	// Use context values only for request-scoped data that transits
+	// processes and API boundaries, not for passing optional parameters to
+	// functions.
+	//
+	// A key identifies a specific value in a Context. Functions that wish
+	// to store values in Context typically allocate a key in a global
+	// variable then use that key as the argument to context.WithValue and
+	// Context.Value. A key can be any type that supports equality;
+	// packages should define keys as an unexported type to avoid
+	// collisions.
+	//
+	// Packages that define a Context key should provide type-safe accessors
+	// for the values stored using that key:
+	//
+	// 	// Package user defines a User type that's stored in Contexts.
+	// 	package user
+	//
+	// 	import "context"
+	//
+	// 	// User is the type of value stored in the Contexts.
+	// 	type User struct {...}
+	//
+	// 	// key is an unexported type for keys defined in this package.
+	// 	// This prevents collisions with keys defined in other packages.
+	// 	type key int
+	//
+	// 	// userKey is the key for user.User values in Contexts. It is
+	// 	// unexported; clients use user.NewContext and user.FromContext
+	// 	// instead of using this key directly.
+	// 	var userKey key = 0
+	//
+	// 	// NewContext returns a new Context that carries value u.
+	// 	func NewContext(ctx context.Context, u *User) context.Context {
+	// 		return context.WithValue(ctx, userKey, u)
+	// 	}
+	//
+	// 	// FromContext returns the User value stored in ctx, if any.
+	// 	func FromContext(ctx context.Context) (*User, bool) {
+	// 		u, ok := ctx.Value(userKey).(*User)
+	// 		return u, ok
+	// 	}
+	Value(key interface{}) interface{}
+}

context/context_1.7.go

@@ -0,0 +1,13 @@
+// +build go1.7
+
+package context
+
+import "context"
+
+func Background() Context {
+	return context.Background()
+}
+
+func WithValue(parent Context, key, val interface{}) Context {
+	return context.WithValue(parent, key, val)
+}

context/context_pre1.7.go

@@ -0,0 +1,13 @@
+// +build !go1.7
+
+package context
+
+import "golang.org/x/net/context"
+
+func Background() Context {
+	return context.Background()
+}
+
+func WithValue(parent Context, key, val interface{}) Context {
+	return context.WithValue(parent, key, val)
+}