xjlgod commented on code in PR #741: URL: https://github.com/apache/incubator-seata-go/pull/741#discussion_r1888536835
########## pkg/saga/statemachine/statelang/parser/statemachine_config_parser.go: ########## @@ -0,0 +1,147 @@ +/* + * 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 parser + +import ( + "bytes" + "encoding/json" + "fmt" + "gopkg.in/yaml.v3" + "io" + "os" + "path/filepath" +) + +// ConfigParser is a general configuration parser interface, used to agree on the implementation of different types of parsers +type ConfigParser interface { + Parse(configContent []byte) (*StateMachineObject, error) +} + +type StateMachineConfigParser struct{} + +func NewStateMachineConfigParser() *StateMachineConfigParser { + return &StateMachineConfigParser{} +} + +func (p *StateMachineConfigParser) checkConfigFile(configFilePath string) error { + _, err := os.Stat(configFilePath) + if os.IsNotExist(err) { + return fmt.Errorf("config file %s does not exist: %w", configFilePath, err) + } + if err != nil { + return fmt.Errorf("failed to access config file %s: %w", configFilePath, err) + } + return nil +} + +func (p *StateMachineConfigParser) readFile(configFilePath string) ([]byte, error) { + file, _ := os.Open(configFilePath) + defer func(file *os.File) { + _ = file.Close() + }(file) + + var buf bytes.Buffer + _, err := io.Copy(&buf, file) + if err != nil { + return nil, fmt.Errorf("failed to read config file %s: %w", configFilePath, err) + } + + return buf.Bytes(), nil +} + +func (p *StateMachineConfigParser) getParser(configFilePath string) (ConfigParser, error) { + fileExt := filepath.Ext(configFilePath) + // check the file extension, compatible with some illegal but possible situations + switch fileExt { + case ".json", ".JSON": + return NewJSONConfigParser(), nil + case ".yaml", ".yml", ".YAML", ".YML": + return NewYAMLConfigParser(), nil + default: + return nil, fmt.Errorf("unsupported config file format: %s", fileExt) + } +} + +func (p *StateMachineConfigParser) Parse(configFilePath string) (*StateMachineObject, error) { + if err := p.checkConfigFile(configFilePath); err != nil { + return nil, err + } + + configContent, err := p.readFile(configFilePath) + if err != nil { + return nil, err + } + + parser, err := p.getParser(configFilePath) + if err != nil { + return nil, err + } + + return parser.Parse(configContent) +} + +type JSONConfigParser struct{} + +func NewJSONConfigParser() *JSONConfigParser { + return &JSONConfigParser{} +} + +func (p *JSONConfigParser) Parse(configContent []byte) (*StateMachineObject, error) { + if configContent == nil || len(configContent) == 0 { + return nil, fmt.Errorf("empty JSON config content") + } + + var stateMachineObject StateMachineObject + if err := json.Unmarshal(configContent, &stateMachineObject); err != nil { + return nil, fmt.Errorf("failed to parse JSON config content: %w", err) + } + + return &stateMachineObject, nil +} + +type YAMLConfigParser struct{} + +func NewYAMLConfigParser() *YAMLConfigParser { + return &YAMLConfigParser{} +} + +func (p *YAMLConfigParser) Parse(configContent []byte) (*StateMachineObject, error) { + if configContent == nil || len(configContent) == 0 { + return nil, fmt.Errorf("empty YAML config content") + } + + var stateMachineObject StateMachineObject + if err := yaml.Unmarshal(configContent, &stateMachineObject); err != nil { + return nil, fmt.Errorf("failed to parse YAML config content: %w", err) + } + + return &stateMachineObject, nil +} + +type StateMachineObject struct { Review Comment: There was a stateMachineJsonObject struct, maybe we can unify them? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: notifications-unsubscr...@seata.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: notifications-unsubscr...@seata.apache.org For additional commands, e-mail: notifications-h...@seata.apache.org
