| // Copyright Istio 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. |
| |
| //go:build ignore |
| // +build ignore |
| |
| package main |
| |
| import ( |
| "bytes" |
| "fmt" |
| "os" |
| "regexp" |
| "text/template" |
| ) |
| |
| import ( |
| "sigs.k8s.io/yaml" |
| ) |
| |
| const ( |
| codeRegex = `^IST\d\d\d\d$` |
| nameRegex = `^[[:upper:]]\w*$` |
| ) |
| |
| // Utility for generating messages.gen.go. Called from gen.go |
| func main() { |
| if len(os.Args) != 3 { |
| fmt.Println("Invalid args:", os.Args) |
| os.Exit(-1) |
| } |
| |
| input := os.Args[1] |
| output := os.Args[2] |
| |
| m, err := read(input) |
| if err != nil { |
| fmt.Println("Error reading metadata:", err) |
| os.Exit(-2) |
| } |
| |
| err = validate(m) |
| if err != nil { |
| fmt.Println("Error validating messages:", err) |
| os.Exit(-3) |
| } |
| |
| code, err := generate(m) |
| if err != nil { |
| fmt.Println("Error generating code:", err) |
| os.Exit(-4) |
| } |
| |
| if err = os.WriteFile(output, []byte(code), os.ModePerm); err != nil { |
| fmt.Println("Error writing output file:", err) |
| os.Exit(-5) |
| } |
| } |
| |
| func read(path string) (*messages, error) { |
| b, err := os.ReadFile(path) |
| if err != nil { |
| return nil, fmt.Errorf("unable to read input file: %v", err) |
| } |
| |
| m := &messages{} |
| |
| if err := yaml.Unmarshal(b, m); err != nil { |
| return nil, err |
| } |
| |
| return m, nil |
| } |
| |
| // Enforce that names and codes follow expected regex and are unique |
| func validate(ms *messages) error { |
| codes := make(map[string]bool) |
| names := make(map[string]bool) |
| |
| for _, m := range ms.Messages { |
| matched, err := regexp.MatchString(codeRegex, m.Code) |
| if err != nil { |
| return err |
| } |
| if !matched { |
| return fmt.Errorf("Error code for message %q must follow the regex %s", m.Name, codeRegex) |
| } |
| |
| if codes[m.Code] { |
| return fmt.Errorf("Error codes must be unique, %q defined more than once", m.Code) |
| } |
| codes[m.Code] = true |
| |
| matched, err = regexp.MatchString(nameRegex, m.Name) |
| if err != nil { |
| return err |
| } |
| if !matched { |
| return fmt.Errorf("Name for message %q must follow the regex %s", m.Name, nameRegex) |
| } |
| |
| if names[m.Name] { |
| return fmt.Errorf("Message names must be unique, %q defined more than once", m.Name) |
| } |
| names[m.Name] = true |
| } |
| return nil |
| } |
| |
| var tmpl = ` |
| // GENERATED FILE -- DO NOT EDIT |
| // |
| |
| package msg |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis/diag" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/resource" |
| ) |
| |
| var ( |
| {{- range .Messages}} |
| // {{.Name}} defines a diag.MessageType for message "{{.Name}}". |
| // Description: {{.Description}} |
| {{.Name}} = diag.NewMessageType(diag.{{.Level}}, "{{.Code}}", "{{.Template}}") |
| {{end}} |
| ) |
| |
| // All returns a list of all known message types. |
| func All() []*diag.MessageType { |
| return []*diag.MessageType{ |
| {{- range .Messages}} |
| {{.Name}}, |
| {{- end}} |
| } |
| } |
| |
| {{range .Messages}} |
| // New{{.Name}} returns a new diag.Message based on {{.Name}}. |
| func New{{.Name}}(r *resource.Instance{{range .Args}}, {{.Name}} {{.Type}}{{end}}) diag.Message { |
| return diag.NewMessage( |
| {{.Name}}, |
| r, |
| {{- range .Args}} |
| {{.Name}}, |
| {{- end}} |
| ) |
| } |
| {{end}} |
| ` |
| |
| func generate(m *messages) (string, error) { |
| t := template.Must(template.New("code").Parse(tmpl)) |
| |
| var b bytes.Buffer |
| if err := t.Execute(&b, m); err != nil { |
| return "", err |
| } |
| return b.String(), nil |
| } |
| |
| type messages struct { |
| Messages []message `json:"messages"` |
| } |
| |
| type message struct { |
| Name string `json:"name"` |
| Code string `json:"code"` |
| Level string `json:"level"` |
| Description string `json:"description"` |
| Template string `json:"template"` |
| Url string `json:"url"` |
| Args []arg `json:"args"` |
| } |
| |
| type arg struct { |
| Name string `json:"name"` |
| Type string `json:"type"` |
| } |