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Fix context api and document (#727)

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* Fix Dial function crash instance when there is no instance context in the ctx

* check ctx to fix. (#841)

* Feat: core.ToContext(ctx, v) for ctx initialization (#852)

* remove exported API: toContext

* Remove unnecessary API

* rework document for API

* fix: make sure the ctx is propagated to connections by detached connection

Co-authored-by: Shelikhoo <xiaokangwang@outlook.com>
Co-authored-by: rurirei <72071920+rurirei@users.noreply.github.com>
This commit is contained in:
yuhan6665 2022-02-19 22:45:41 -05:00 committed by GitHub
parent cf1ee095a2
commit 496b2c02c5
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 35 additions and 3 deletions
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3
app/dns/nameserver_udp.go
View file

@ -17,6 +17,7 @@ import (
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal/pubsub"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
dns_feature "github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet/udp"
@ -195,7 +196,7 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, client
for _, req := range reqs {
s.addPendingRequest(req)
b, _ := dns.PackMessage(req.msg)
udpCtx := context.Background()
udpCtx := core.ToBackgroundDetachedContext(ctx)
if inbound := session.InboundFromContext(ctx); inbound != nil {
udpCtx = session.ContextWithInbound(udpCtx, inbound)
}

25
core/context.go
View file

@ -25,3 +25,28 @@ func MustFromContext(ctx context.Context) *Instance {
}
return x
}
/* toContext returns ctx from the given context, or creates an Instance if the context doesn't find that.
It is unsupported to use this function to create a context that is suitable to invoke Xray's internal component
in third party code, you shouldn't use //go:linkname to alias of this function into your own package and
use this function in your third party code.
For third party code, usage enabled by creating a context to interact with Xray's internal component is unsupported,
and may break at any time.
*/
func toContext(ctx context.Context, v *Instance) context.Context {
if FromContext(ctx) != v {
ctx = context.WithValue(ctx, xrayKey, v)
}
return ctx
}
/*ToBackgroundDetachedContext create a detached context from another context
Internal API
*/
func ToBackgroundDetachedContext(ctx context.Context) context.Context {
instance := MustFromContext(ctx)
return toContext(context.Background(), instance)
}

3
core/context_test.go
View file

@ -5,9 +5,10 @@ import (
"testing"
. "github.com/xtls/xray-core/core"
_ "unsafe"
)
func TestContextPanic(t *testing.T) {
func TestFromContextPanic(t *testing.T) {
defer func() {
r := recover()
if r == nil {

7
core/functions.go
View file

@ -15,7 +15,7 @@ import (
func CreateObject(v *Instance, config interface{}) (interface{}, error) {
ctx := v.ctx
if v != nil {
ctx = context.WithValue(ctx, xrayKey, v)
ctx = toContext(v.ctx, v)
}
return common.CreateObject(ctx, config)
}
@ -46,10 +46,13 @@ func StartInstance(configFormat string, configBytes []byte) (*Instance, error) {
//
// xray:api:stable
func Dial(ctx context.Context, v *Instance, dest net.Destination) (net.Conn, error) {
ctx = toContext(ctx, v)
dispatcher := v.GetFeature(routing.DispatcherType())
if dispatcher == nil {
return nil, newError("routing.Dispatcher is not registered in Xray core")
}
r, err := dispatcher.(routing.Dispatcher).Dispatch(ctx, dest)
if err != nil {
return nil, err
@ -70,6 +73,8 @@ func Dial(ctx context.Context, v *Instance, dest net.Destination) (net.Conn, err
//
// xray:api:beta
func DialUDP(ctx context.Context, v *Instance) (net.PacketConn, error) {
ctx = toContext(ctx, v)
dispatcher := v.GetFeature(routing.DispatcherType())
if dispatcher == nil {
return nil, newError("routing.Dispatcher is not registered in Xray core")