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render.go
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render.go
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package writer
import (
"bufio"
"bytes"
"fmt"
"os"
"path"
"runtime/debug"
"strings"
"github.com/bdragon300/go-asyncapi/internal/types"
"github.com/bdragon300/go-asyncapi/internal/compiler"
"github.com/bdragon300/go-asyncapi/internal/utils"
"github.com/bdragon300/go-asyncapi/internal/common"
"github.com/dave/jennifer/jen"
)
const GeneratedCodePreamble = "Code generated by go-asyncapi tool. DO NOT EDIT."
type MultilineError struct {
error
}
func (e MultilineError) Error() string {
s := e.error.Error()
i := strings.IndexRune(s, '\n')
if i < 0 {
return s
}
return s[:i]
}
func (e MultilineError) RestLines() string {
lineno := 1
bld := strings.Builder{}
rd := bufio.NewReader(strings.NewReader(e.error.Error()))
_, _ = rd.ReadString('\n') // Skip the first line
for {
s, err := rd.ReadString('\n')
if err != nil {
break // Suppose that the only error here can appear is io.EOF
}
bld.WriteString(fmt.Sprintf("%-3d| ", lineno))
bld.WriteString(s)
lineno++
}
return bld.String()
}
type renderSource interface {
PackageObjects(pkgName string) []compiler.Object
Packages() []string
}
func RenderPackages(source renderSource, protoRenderers map[string]common.ProtocolRenderer, opts common.RenderOpts) (fileContents map[string]*bytes.Buffer, err error) {
fileContents = make(map[string]*bytes.Buffer)
logger := types.NewLogger("Rendering 🎨")
rendered := 0
totalObjects := 0
logger.Info("Run rendering")
files := make(map[string]*jen.File)
for _, pkgName := range source.Packages() {
ctx := &common.RenderContext{
ProtoRenderers: protoRenderers,
CurrentPackage: pkgName,
Logger: logger,
RenderOpts: opts,
}
items := source.PackageObjects(pkgName)
targetPkg := pkgName
if opts.PackageScope == common.PackageScopeAll {
targetPkg = opts.TargetPackage
}
ctx.Logger.Debug("Package", "pkg", targetPkg, "items", len(items))
totalObjects += len(items)
for _, item := range items {
if !item.Object.DirectRendering() {
continue
}
fileName := pkgName + ".go" // All objects with the same type in one file
if opts.FileScope == common.FileScopeName {
// Every single object in a separate file
fileName = utils.ToFileName(item.Object.ID()) + ".go"
}
if opts.PackageScope == common.PackageScopeType {
fileName = path.Join(targetPkg, fileName)
}
f, ok := files[fileName]
if !ok {
f = jen.NewFilePathName(opts.ImportBase, targetPkg)
f.HeaderComment(GeneratedCodePreamble)
}
rendered++
ctx.Logger.Debug("Render object", "pkg", pkgName, "object", item.Object.String(), "file", fileName)
func() {
// catch panics produced by rendering
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("%s: %s\n%v", item.Object.String(), debug.Stack(), r)
}
}()
for _, stmt := range item.Object.RenderDefinition(ctx) {
f.Add(stmt)
}
}()
if err != nil {
return
}
files[fileName] = f
}
}
logger.Debugf("Render stats: packages %d, objects: %d (rendered directly: %d)", len(source.Packages()), totalObjects, rendered)
for fileName, f := range files {
logger.Trace("Render file", "file", fileName)
buf := &bytes.Buffer{}
if b, ok := fileContents[fileName]; ok {
buf.WriteRune('\n')
buf = b
}
if err = f.Render(buf); err != nil {
if strings.ContainsRune(err.Error(), '\n') {
return fileContents, MultilineError{err}
}
return fileContents, err
}
logger.Debug("Rendered file", "file", fileName, "size", buf.Len())
fileContents[fileName] = buf
}
logger.Info("Rendering completed", "objects", rendered)
return
}
func WriteToFiles(files map[string]*bytes.Buffer, baseDir string) error {
logger := types.NewLogger("Writing 📝")
logger.Info("Run writing")
if err := ensureDir(baseDir); err != nil {
return err
}
totalBytes := 0
for fileName, buf := range files {
logger.Debug("File", "name", fileName)
fullPath := path.Join(baseDir, fileName)
if err := ensureDir(path.Dir(fullPath)); err != nil {
return err
}
if err := os.WriteFile(fullPath, buf.Bytes(), 0o644); err != nil {
return err
}
logger.Debug("File wrote", "name", fullPath, "bytes", buf.Len())
totalBytes += buf.Len()
}
logger.Debugf("Writer stats: files: %d, total bytes: %d", len(files), totalBytes)
logger.Info("Writing completed", "files", len(files))
return nil
}
func ensureDir(path string) error {
if info, err := os.Stat(path); os.IsNotExist(err) {
if err2 := os.MkdirAll(path, 0o755); err2 != nil {
return err2
}
} else if err != nil {
return err
} else if !info.IsDir() {
return fmt.Errorf("path %q is not a directory", path)
}
return nil
}