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|
package main
import (
"bytes"
"flag"
"go/ast"
"go/format"
"go/parser"
"go/token"
"os"
"slices"
"strings"
"text/template"
)
func main() {
inputFile := flag.String("i", "", "input file")
outputFile := flag.String("o", "", "output file")
flag.Parse()
if inputFile == nil || *inputFile == "" || outputFile == nil || *outputFile == "" {
flag.PrintDefaults()
os.Exit(1)
}
// Parse the input file
fileSet := token.NewFileSet()
parsedFile, err := parser.ParseFile(fileSet, *inputFile, nil, parser.SkipObjectResolution)
if err != nil {
panic(err)
}
// Find TaskType* constants.
var consts []string
for _, decl := range parsedFile.Decls {
genDecl, ok := decl.(*ast.GenDecl)
if !ok {
continue
}
for _, spec := range genDecl.Specs {
valueSpec, ok := spec.(*ast.ValueSpec)
if !ok {
continue
}
for _, name := range valueSpec.Names {
if !strings.HasPrefix(name.Name, "TaskType") {
continue
}
if name.Name == "TaskType" {
continue
}
consts = append(consts, strings.TrimPrefix(name.Name, "TaskType"))
}
}
}
if len(consts) == 0 {
panic("TaskType* constants not found")
}
slices.Sort(consts)
// Generate code.
tmpl, err := template.New("code").Parse(templateText)
if err != nil {
panic(err)
}
var buf bytes.Buffer
err = tmpl.Execute(&buf, consts)
if err != nil {
panic(err)
}
formatted, err := format.Source(buf.Bytes())
if err != nil {
panic(err)
}
err = os.WriteFile(*outputFile, formatted, 0644)
if err != nil {
panic(err)
}
}
const templateText = `// Code generated by go generate; DO NOT EDIT.
package taskqueue
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/hibiken/asynq"
)
type processorWrapper struct {
impl processor
results chan TaskResult
}
func newProcessorWrapper(impl processor) *processorWrapper {
return &processorWrapper{
impl: impl,
results: make(chan TaskResult),
}
}
{{ range . }}
func (p *processorWrapper) processTask{{ . }}(ctx context.Context, t *asynq.Task) error {
var payload TaskPayload{{ . }}
if err := json.Unmarshal(t.Payload(), &payload); err != nil {
err := fmt.Errorf("json.Unmarshal failed: %v: %w", err, asynq.SkipRetry)
p.results <- &TaskResult{{ . }}{Err: err}
return err
}
result, err := p.impl.doProcessTask{{ . }}(ctx, &payload)
if err != nil {
retryCount, _ := asynq.GetRetryCount(ctx)
maxRetry, _ := asynq.GetMaxRetry(ctx)
isRecoverable := !errors.Is(err, asynq.SkipRetry) && retryCount < maxRetry
if !isRecoverable {
p.results <- &TaskResult{{ . }}{Err: err}
}
return err
}
p.results <- result
return nil
}
{{ end }}
`
|
