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split.go
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split.go
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// Copyright 2021-2024 Zenauth Ltd.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"encoding/json"
"errors"
"fmt"
"os"
"sort"
"github.com/alecthomas/kong"
"github.com/gobwas/glob"
"golang.org/x/tools/go/packages"
"gopkg.in/yaml.v3"
)
type splitCmd struct {
IgnoreFile string `type:"existingfile" optional:""`
Kind string
Index int
Total int
}
func (cmd *splitCmd) Run(k *kong.Kong) error {
times, err := readTestTimes()
if err != nil {
return err
}
packages, err := listPackages(cmd.IgnoreFile)
if err != nil {
return err
}
buckets := make(testBuckets, cmd.Total)
for _, time := range times[cmd.Kind] {
if _, ok := packages[time.Package]; ok {
buckets.LeastFull().Add(time)
delete(packages, time.Package)
}
}
for _, pkg := range packages.Packages() {
buckets.LeastFull().Add(testTime{Package: pkg, Time: newPackageTime})
}
fmt.Fprintf(k.Stderr, "%s test split %d/%d (expected time %.1fs)\n\n", cmd.Kind, cmd.Index+1, cmd.Total, buckets[cmd.Index].TotalTime)
for _, pkg := range buckets[cmd.Index].Packages {
fmt.Fprintln(k.Stderr, pkg)
fmt.Fprintln(k.Stdout, pkg)
}
fmt.Fprintln(k.Stderr)
return nil
}
func readTestTimes() (testTimesByKind, error) {
data, err := os.ReadFile(testTimesPath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return testTimesByKind{}, nil
}
return nil, fmt.Errorf("failed to read test times: %w", err)
}
var result testTimesByKind
err = json.Unmarshal(data, &result)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal test times: %w", err)
}
return result, nil
}
type packageSet map[string]struct{}
func (pkgs packageSet) Packages() []string {
result := make([]string, 0, len(pkgs))
for pkg := range pkgs {
result = append(result, pkg)
}
sort.Strings(result)
return result
}
func listPackages(ignoreFile string) (packageSet, error) {
var ignoredPkgs globList
if ignoreFile != "" {
ignore, err := loadIgnoreList(ignoreFile)
if err != nil {
return nil, fmt.Errorf("failed to load ignore list from %q: %w", ignoreFile, err)
}
ignoredPkgs = ignore
}
packages, err := packages.Load(&packages.Config{Mode: packages.NeedName}, "./...")
if err != nil {
return nil, fmt.Errorf("failed to list Go packages: %w", err)
}
result := make(packageSet, len(packages))
for _, pkg := range packages {
if !ignoredPkgs.Matches(pkg.PkgPath) {
result[pkg.PkgPath] = struct{}{}
}
}
return result, nil
}
type globList []glob.Glob
func (gl globList) Matches(value string) bool {
for _, g := range gl {
if g.Match(value) {
return true
}
}
return false
}
func loadIgnoreList(ignoreFile string) (globList, error) {
listBytes, err := os.ReadFile(ignoreFile)
if err != nil {
return nil, fmt.Errorf("failed to read %q: %w", ignoreFile, err)
}
var ignoreList struct {
Ignore []string `yaml:"ignore"`
}
if err := yaml.Unmarshal(listBytes, &ignoreList); err != nil {
return nil, fmt.Errorf("failed to unmarshal YAML: %w", err)
}
ignoreGlobs := make(globList, len(ignoreList.Ignore))
for i, gp := range ignoreList.Ignore {
g, err := glob.Compile(gp)
if err != nil {
return nil, fmt.Errorf("failed to compile glob pattern %q: %w", gp, err)
}
ignoreGlobs[i] = g
}
return ignoreGlobs, nil
}