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export_generated_code.go
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/
export_generated_code.go
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/*
* Copyright (c) Microsoft Corporation.
* Licensed under the MIT license.
*/
package pipeline
import (
"context"
"fmt"
"os"
"path/filepath"
"sync"
"time"
"github.com/go-logr/logr"
"github.com/pkg/errors"
"golang.org/x/exp/slices"
"golang.org/x/sync/errgroup"
"github.com/Azure/azure-service-operator/v2/tools/generator/internal/astmodel"
)
// ExportPackagesStageID is the unique identifier for this pipeline stage
const ExportPackagesStageID = "exportPackages"
// ExportPackages creates a Stage to export our generated code as a set of packages
func ExportPackages(
outputPath string,
emitDocFiles bool,
log logr.Logger,
) *Stage {
description := fmt.Sprintf("Export packages to %q", outputPath)
stage := NewLegacyStage(
ExportPackagesStageID,
description,
func(ctx context.Context, definitions astmodel.TypeDefinitionSet) (astmodel.TypeDefinitionSet, error) {
packages, err := CreatePackagesForDefinitions(definitions)
if err != nil {
return nil, errors.Wrapf(err, "failed to assign generated definitions to packages")
}
err = writeFiles(packages, outputPath, emitDocFiles, log)
if err != nil {
return nil, errors.Wrapf(err, "unable to write files into %q", outputPath)
}
return definitions, nil
})
stage.RequiresPrerequisiteStages(DeleteGeneratedCodeStageID)
return stage
}
// CreatePackagesForDefinitions groups type definitions into packages
func CreatePackagesForDefinitions(
definitions astmodel.TypeDefinitionSet,
) (map[astmodel.InternalPackageReference]*astmodel.PackageDefinition, error) {
packages := make(map[astmodel.InternalPackageReference]*astmodel.PackageDefinition)
for _, def := range definitions {
name := def.Name()
ref := name.InternalPackageReference()
if pkg, ok := packages[ref]; ok {
pkg.AddDefinition(def)
} else {
pkg = astmodel.NewPackageDefinition(ref)
pkg.AddDefinition(def)
packages[ref] = pkg
}
}
return packages, nil
}
func writeFiles(
packages map[astmodel.InternalPackageReference]*astmodel.PackageDefinition,
outputPath string,
emitDocFiles bool,
log logr.Logger,
) error {
pkgs := make([]*astmodel.PackageDefinition, 0, len(packages))
for _, pkg := range packages {
pkgs = append(pkgs, pkg)
}
// Sort the list of packages to ensure we always write them to disk in the same sequence
slices.SortFunc(
pkgs,
func(left *astmodel.PackageDefinition, right *astmodel.PackageDefinition) int {
if left.Path < right.Path {
return -1
} else if left.Path > right.Path {
return 1
} else {
return 0
}
})
// emit each package
log.Info(
"Writing packages",
"count", len(pkgs),
"outputPath", outputPath)
globalProgress := newProgressMeter()
groupProgress := newProgressMeter()
var eg errgroup.Group
eg.SetLimit(8)
for _, pkg := range pkgs {
pkg := pkg
eg.Go(func() error {
// create directory if not already there
outputDir := filepath.Join(outputPath, pkg.Path)
if _, err := os.Stat(outputDir); os.IsNotExist(err) {
err = os.MkdirAll(outputDir, 0o700)
if err != nil {
return errors.Wrapf(err, "unable to create directory %q", outputDir)
}
}
count, err := pkg.EmitDefinitions(outputDir, packages, emitDocFiles)
if err != nil {
return errors.Wrapf(err, "error writing definitions into %q", outputDir)
}
globalProgress.LogProgress("", pkg.DefinitionCount(), count, log)
groupProgress.LogProgress(pkg.Path, pkg.DefinitionCount(), count, log)
return nil
})
}
err := eg.Wait()
if err != nil {
return err
}
// log anything leftover
globalProgress.mutex.Lock()
defer globalProgress.mutex.Unlock()
globalProgress.Log(log)
return nil
}
func newProgressMeter() *progressMeter {
return &progressMeter{
resetAt: time.Now(),
}
}
// progressMeter is a utility struct used to improve our reporting of progress while exporting files
type progressMeter struct {
label string
definitions int
files int
resetAt time.Time
mutex sync.Mutex
}
// Log writes a log message for our progress to this point
func (export *progressMeter) Log(log logr.Logger) {
started := export.resetAt
export.resetAt = time.Now()
if export.definitions == 0 && export.files == 0 {
return
}
elapsed := time.Since(started).Round(time.Millisecond)
if export.label != "" {
log.V(1).Info(
"Wrote files",
"label", export.label,
"files", export.files,
"types", export.definitions,
"elapsed", elapsed)
} else {
log.V(1).Info(
"Wrote files",
"files", export.files,
"types", export.definitions,
"elapsed", elapsed)
}
export.resetAt = time.Now()
}
// LogProgress accumulates totals until a new label is supplied, when it will write a log message
func (export *progressMeter) LogProgress(
label string,
definitions int,
files int,
log logr.Logger,
) {
export.mutex.Lock()
defer export.mutex.Unlock()
if export.label != label {
// New group, output our current totals and reset
export.Log(log)
export.definitions = 0
export.files = 0
export.resetAt = time.Now()
}
export.label = label
export.definitions += definitions
export.files += files
}