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service_inline.go
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service_inline.go
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/*
* Copyright 2023 CloudWeGo Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package client
import (
"context"
"errors"
"net"
"runtime/debug"
"github.com/bytedance/gopkg/cloud/metainfo"
"github.com/cloudwego/kitex/client/callopt"
"github.com/cloudwego/kitex/internal/client"
internal_server "github.com/cloudwego/kitex/internal/server"
"github.com/cloudwego/kitex/pkg/endpoint"
"github.com/cloudwego/kitex/pkg/klog"
"github.com/cloudwego/kitex/pkg/rpcinfo"
"github.com/cloudwego/kitex/pkg/serviceinfo"
"github.com/cloudwego/kitex/pkg/utils"
)
var localAddr net.Addr
func init() {
localAddr = utils.NewNetAddr("tcp", "127.0.0.1")
}
type ContextServiceInlineHandler interface {
WriteMeta(cliCtx, svrCtx context.Context, req interface{}) (newSvrCtx context.Context, err error)
ReadMeta(cliCtx, svrCtx context.Context, resp interface{}) (newCliCtx context.Context, err error)
}
type serviceInlineClient struct {
svcInfo *serviceinfo.ServiceInfo
mws []endpoint.Middleware
eps endpoint.Endpoint
opt *client.Options
inited bool
closed bool
// server info
serverEps endpoint.Endpoint
serverOpt *internal_server.Options
contextServiceInlineHandler ContextServiceInlineHandler
}
type ServerInitialInfo interface {
Endpoints() endpoint.Endpoint
Option() *internal_server.Options
GetServiceInfo() *serviceinfo.ServiceInfo
}
// NewServiceInlineClient creates a kitex.Client with the given ServiceInfo, it is from generated code.
func NewServiceInlineClient(svcInfo *serviceinfo.ServiceInfo, s ServerInitialInfo, opts ...Option) (Client, error) {
if svcInfo == nil {
return nil, errors.New("NewClient: no service info")
}
kc := &serviceInlineClient{}
kc.svcInfo = svcInfo
kc.opt = client.NewOptions(opts)
kc.serverEps = s.Endpoints()
kc.serverOpt = s.Option()
kc.serverOpt.RemoteOpt.SvcInfo = s.GetServiceInfo()
if err := kc.init(); err != nil {
_ = kc.Close()
return nil, err
}
return kc, nil
}
func (kc *serviceInlineClient) SetContextServiceInlineHandler(simh ContextServiceInlineHandler) {
kc.contextServiceInlineHandler = simh
}
func (kc *serviceInlineClient) init() (err error) {
if err = kc.checkOptions(); err != nil {
return err
}
ctx := kc.initContext()
kc.initMiddlewares(ctx)
kc.richRemoteOption()
if err = kc.buildInvokeChain(); err != nil {
return err
}
kc.inited = true
return nil
}
func (kc *serviceInlineClient) checkOptions() (err error) {
if kc.opt.Svr.ServiceName == "" {
return errors.New("service name is required")
}
return nil
}
func (kc *serviceInlineClient) initContext() context.Context {
ctx := context.Background()
ctx = context.WithValue(ctx, endpoint.CtxEventBusKey, kc.opt.Bus)
ctx = context.WithValue(ctx, endpoint.CtxEventQueueKey, kc.opt.Events)
return ctx
}
func (kc *serviceInlineClient) initMiddlewares(ctx context.Context) {
builderMWs := richMWsWithBuilder(ctx, kc.opt.MWBs)
kc.mws = append(kc.mws, contextMW)
kc.mws = append(kc.mws, builderMWs...)
}
// initRPCInfo initializes the RPCInfo structure and attaches it to context.
func (kc *serviceInlineClient) initRPCInfo(ctx context.Context, method string) (context.Context, rpcinfo.RPCInfo, *callopt.CallOptions) {
return initRPCInfo(ctx, method, kc.opt, kc.svcInfo, 0)
}
// Call implements the Client interface .
func (kc *serviceInlineClient) Call(ctx context.Context, method string, request, response interface{}) (err error) {
validateForCall(ctx, kc.inited, kc.closed)
var ri rpcinfo.RPCInfo
var callOpts *callopt.CallOptions
ctx, ri, callOpts = kc.initRPCInfo(ctx, method)
ctx = kc.opt.TracerCtl.DoStart(ctx, ri)
var reportErr error
defer func() {
if panicInfo := recover(); panicInfo != nil {
reportErr = rpcinfo.ClientPanicToErr(ctx, panicInfo, ri, false)
}
kc.opt.TracerCtl.DoFinish(ctx, ri, reportErr)
rpcinfo.PutRPCInfo(ri)
callOpts.Recycle()
}()
reportErr = kc.eps(ctx, request, response)
if reportErr == nil {
err = ri.Invocation().BizStatusErr()
} else {
err = reportErr
}
return err
}
func (kc *serviceInlineClient) richRemoteOption() {
kc.opt.RemoteOpt.SvcInfo = kc.svcInfo
}
func (kc *serviceInlineClient) buildInvokeChain() error {
innerHandlerEp, err := kc.invokeHandleEndpoint()
if err != nil {
return err
}
kc.eps = endpoint.Chain(kc.mws...)(innerHandlerEp)
return nil
}
func (kc *serviceInlineClient) constructServerCtxWithMetadata(cliCtx context.Context) (serverCtx context.Context) {
serverCtx = context.Background()
// metainfo
// forward transmission
kvs := make(map[string]string, 16)
metainfo.SaveMetaInfoToMap(cliCtx, kvs)
if len(kvs) > 0 {
serverCtx = metainfo.SetMetaInfoFromMap(serverCtx, kvs)
}
serverCtx = metainfo.TransferForward(serverCtx)
// reverse transmission, backward mark
serverCtx = metainfo.WithBackwardValuesToSend(serverCtx)
return serverCtx
}
func (kc *serviceInlineClient) constructServerRPCInfo(svrCtx, cliCtx context.Context) (newServerCtx context.Context, svrRPCInfo rpcinfo.RPCInfo) {
rpcStats := rpcinfo.AsMutableRPCStats(rpcinfo.NewRPCStats())
if kc.serverOpt.StatsLevel != nil {
rpcStats.SetLevel(*kc.serverOpt.StatsLevel)
}
// Export read-only views to external users and keep a mapping for internal users.
ri := rpcinfo.NewRPCInfo(
rpcinfo.EmptyEndpointInfo(),
rpcinfo.FromBasicInfo(kc.serverOpt.Svr),
rpcinfo.NewServerInvocation(),
rpcinfo.AsMutableRPCConfig(kc.serverOpt.Configs).Clone().ImmutableView(),
rpcStats.ImmutableView(),
)
rpcinfo.AsMutableEndpointInfo(ri.From()).SetAddress(localAddr)
svrCtx = rpcinfo.NewCtxWithRPCInfo(svrCtx, ri)
cliRpcInfo := rpcinfo.GetRPCInfo(cliCtx)
// handle common rpcinfo
method := cliRpcInfo.To().Method()
if ink, ok := ri.Invocation().(rpcinfo.InvocationSetter); ok {
ink.SetMethodName(method)
ink.SetServiceName(kc.svcInfo.ServiceName)
}
rpcinfo.AsMutableEndpointInfo(ri.To()).SetMethod(method)
return svrCtx, ri
}
func (kc *serviceInlineClient) invokeHandleEndpoint() (endpoint.Endpoint, error) {
svrTraceCtl := kc.serverOpt.TracerCtl
if svrTraceCtl == nil {
svrTraceCtl = &rpcinfo.TraceController{}
}
return func(ctx context.Context, req, resp interface{}) (err error) {
serverCtx := kc.constructServerCtxWithMetadata(ctx)
defer func() {
// backward key
kvs := metainfo.AllBackwardValuesToSend(serverCtx)
if len(kvs) > 0 {
metainfo.SetBackwardValuesFromMap(ctx, kvs)
}
}()
serverCtx, svrRPCInfo := kc.constructServerRPCInfo(serverCtx, ctx)
defer func() {
rpcinfo.PutRPCInfo(svrRPCInfo)
}()
// server trace
serverCtx = svrTraceCtl.DoStart(serverCtx, svrRPCInfo)
if kc.contextServiceInlineHandler != nil {
serverCtx, err = kc.contextServiceInlineHandler.WriteMeta(ctx, serverCtx, req)
if err != nil {
return err
}
}
// server logic
err = kc.serverEps(serverCtx, req, resp)
// finish server trace
// contextServiceInlineHandler may convert nil err to non nil err, so handle trace here
svrTraceCtl.DoFinish(serverCtx, svrRPCInfo, err)
if kc.contextServiceInlineHandler != nil {
var err1 error
ctx, err1 = kc.contextServiceInlineHandler.ReadMeta(ctx, serverCtx, resp)
if err1 != nil {
return err1
}
}
return err
}, nil
}
// Close is not concurrency safe.
func (kc *serviceInlineClient) Close() error {
defer func() {
if err := recover(); err != nil {
klog.Warnf("KITEX: panic when close client, error=%s, stack=%s", err, string(debug.Stack()))
}
}()
if kc.closed {
return nil
}
kc.closed = true
var errs utils.ErrChain
for _, cb := range kc.opt.CloseCallbacks {
if err := cb(); err != nil {
errs.Append(err)
}
}
if errs.HasError() {
return errs
}
return nil
}