Code-Fight commented on code in PR #769: URL: https://github.com/apache/incubator-seata-go/pull/769#discussion_r1959837507
########## pkg/saga/statemachine/engine/invoker/http_invoker.go: ########## @@ -0,0 +1,220 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 invoker + +import ( + "bytes" + "context" + "encoding/json" + "errors" + "fmt" + "io" + "net/http" + "reflect" + "strings" + "sync" + "time" + + "github.com/seata/seata-go/pkg/saga/statemachine/statelang/state" + "github.com/seata/seata-go/pkg/util/log" +) + +type HTTPInvoker struct { + clientsMapLock sync.Mutex + clients map[string]HTTPClient +} + +func NewHTTPInvoker() *HTTPInvoker { + return &HTTPInvoker{ + clients: make(map[string]HTTPClient), + } +} + +func (h *HTTPInvoker) RegisterClient(serviceName string, client HTTPClient) { + h.clientsMapLock.Lock() + defer h.clientsMapLock.Unlock() + h.clients[serviceName] = client +} + +func (h *HTTPInvoker) GetClient(serviceName string) HTTPClient { + h.clientsMapLock.Lock() + defer h.clientsMapLock.Unlock() + return h.clients[serviceName] +} + +func (h *HTTPInvoker) Invoke(ctx context.Context, input []any, service state.ServiceTaskState) (output []reflect.Value, err error) { + serviceTaskStateImpl := service.(*state.ServiceTaskStateImpl) + client := h.GetClient(serviceTaskStateImpl.ServiceName()) + if client == nil { + return nil, fmt.Errorf("no http client %s for service task state", serviceTaskStateImpl.ServiceName()) + } + + if serviceTaskStateImpl.IsAsync() { + go func() { + _, err := client.Call(ctx, serviceTaskStateImpl, input) + if err != nil { + log.Errorf("invoke Service[%s].%s failed, err is %s", serviceTaskStateImpl.ServiceName(), + serviceTaskStateImpl.ServiceMethod(), err) + } + }() + return nil, nil + } + + return client.Call(ctx, serviceTaskStateImpl, input) +} + +func (h *HTTPInvoker) Close(ctx context.Context) error { + return nil +} + +type HTTPClient interface { + Call(ctx context.Context, serviceTaskStateImpl *state.ServiceTaskStateImpl, input []any) ([]reflect.Value, error) +} + +type HTTPClientImpl struct { + serviceName string + baseURL string + client *http.Client +} + +func NewHTTPClient(serviceName string, baseURL string, client *http.Client) *HTTPClientImpl { + if client == nil { + client = &http.Client{ + Timeout: time.Second * 30, + } + } + return &HTTPClientImpl{ + serviceName: serviceName, + baseURL: baseURL, + client: client, + } +} + +func (h *HTTPClientImpl) Call(ctx context.Context, serviceTaskStateImpl *state.ServiceTaskStateImpl, input []any) ([]reflect.Value, error) { + retryCountMap := make(map[state.Retry]int) + for { + res, err, shouldRetry := func() (res []reflect.Value, resErr error, shouldRetry bool) { + defer func() { + if r := recover(); r != nil { + errStr := fmt.Sprintf("%v", r) + retry := h.matchRetry(serviceTaskStateImpl, errStr) + resErr = errors.New(errStr) + if retry != nil { + shouldRetry = h.needRetry(serviceTaskStateImpl, retryCountMap, retry, resErr) + } + } + }() + + // 构造HTTP请求 + reqBody, err := json.Marshal(input) + if err != nil { + return nil, err, false + } + + req, err := http.NewRequestWithContext(ctx, + serviceTaskStateImpl.ServiceMethod(), + h.baseURL+serviceTaskStateImpl.Name(), + bytes.NewBuffer(reqBody)) + if err != nil { + return nil, err, false + } + + req.Header.Set("Content-Type", "application/json") + + resp, err := h.client.Do(req) + if err != nil { + retry := h.matchRetry(serviceTaskStateImpl, err.Error()) + if retry != nil { + return nil, err, h.needRetry(serviceTaskStateImpl, retryCountMap, retry, err) + } + return nil, err, false + } + defer resp.Body.Close() + + body, err := io.ReadAll(resp.Body) + if err != nil { + return nil, err, false + } + + if resp.StatusCode >= 400 { + errStr := fmt.Sprintf("HTTP error: %d - %s", resp.StatusCode, string(body)) + retry := h.matchRetry(serviceTaskStateImpl, errStr) + if retry != nil { + return nil, errors.New(errStr), h.needRetry(serviceTaskStateImpl, retryCountMap, retry, err) + } + return nil, errors.New(errStr), false + } + + // 返回响应结果 Review Comment: done -- This is an automated message from the Apache Git Service. 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