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generate.go
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generate.go
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package command
import (
"context"
"encoding/json"
"io"
"os"
"strings"
"time"
"github.com/evergreen-ci/evergreen"
"github.com/evergreen-ci/evergreen/agent/internal"
"github.com/evergreen-ci/evergreen/agent/internal/client"
"github.com/evergreen-ci/evergreen/util"
"github.com/evergreen-ci/utility"
"github.com/mitchellh/mapstructure"
"github.com/mongodb/grip"
"github.com/pkg/errors"
)
type generateTask struct {
// Files are a list of JSON documents.
Files []string `mapstructure:"files" plugin:"expand"`
// Optional causes generate.tasks to noop if no files match
Optional bool `mapstructure:"optional"`
base
}
func generateTaskFactory() Command { return &generateTask{} }
func (c *generateTask) Name() string { return "generate.tasks" }
func (c *generateTask) ParseParams(params map[string]interface{}) error {
if err := mapstructure.Decode(params, c); err != nil {
return errors.Wrap(err, "decoding mapstructure params")
}
if len(c.Files) == 0 {
return errors.Errorf("must provide at least 1 file containing task generation definitions")
}
return nil
}
func (c *generateTask) Execute(ctx context.Context, comm client.Communicator, logger client.LoggerProducer, conf *internal.TaskConfig) error {
var err error
if err = util.ExpandValues(c, &conf.Expansions); err != nil {
return errors.Wrap(err, "applying expansions")
}
include := utility.NewGitIgnoreFileMatcher(conf.WorkDir, c.Files...)
b := utility.FileListBuilder{
WorkingDir: conf.WorkDir,
Include: include,
}
if c.Files, err = b.Build(); err != nil {
return errors.Wrap(err, "building wildcard paths")
}
if len(c.Files) == 0 {
if c.Optional {
logger.Task().Infof("No files found and optional is true, skipping command '%s'.", c.Name())
return nil
}
return errors.Errorf("no files found for command '%s'", c.Name())
}
catcher := grip.NewBasicCatcher()
td := client.TaskData{ID: conf.Task.Id, Secret: conf.Task.Secret}
var jsonBytes [][]byte
for _, fn := range c.Files {
if err := ctx.Err(); err != nil {
catcher.Wrapf(ctx.Err(), "cancelled while processing file '%s'", fn)
break
}
var data []byte
data, err = generateTaskForFile(fn, conf)
if err != nil {
catcher.Add(err)
continue
}
jsonBytes = append(jsonBytes, data)
}
if catcher.HasErrors() {
return errors.WithStack(catcher.Resolve())
}
var post []json.RawMessage
post, err = makeJsonOfAllFiles(jsonBytes)
if err != nil {
return errors.Wrap(err, "parsing JSON")
}
if err = comm.GenerateTasks(ctx, td, post); err != nil {
if strings.Contains(err.Error(), evergreen.TasksAlreadyGeneratedError) {
logger.Task().Info("Tasks have already been generated, nooping.")
return nil
}
return errors.Wrap(err, "posting task data")
}
const (
pollAttempts = 1500
pollRetryMinDelay = time.Second
pollRetryMaxDelay = 15 * time.Second
)
err = utility.Retry(
ctx,
func() (bool, error) {
generateStatus, err := comm.GenerateTasksPoll(ctx, td)
if err != nil {
return false, err
}
var generateErr error
if generateStatus.Error != "" {
generateErr = errors.New(generateStatus.Error)
}
if generateErr != nil {
return false, generateErr
}
if generateStatus.Finished {
return false, nil
}
return true, errors.New("task generation unfinished")
}, utility.RetryOptions{
MaxAttempts: pollAttempts,
MinDelay: pollRetryMinDelay,
MaxDelay: pollRetryMaxDelay,
})
if err != nil {
return errors.WithMessage(err, "polling for generate tasks job")
}
return nil
}
func generateTaskForFile(fn string, conf *internal.TaskConfig) ([]byte, error) {
fileLoc := GetWorkingDirectory(conf, fn)
if _, err := os.Stat(fileLoc); os.IsNotExist(err) {
return nil, errors.Wrapf(err, "getting information for file '%s'", fn)
}
jsonFile, err := os.Open(fileLoc)
if err != nil {
return nil, errors.Wrapf(err, "opening file '%s'", fn)
}
defer jsonFile.Close()
var data []byte
data, err = io.ReadAll(jsonFile)
if err != nil {
return nil, errors.Wrapf(err, "reading from file '%s'", fn)
}
return data, nil
}
// makeJsonOfAllFiles creates a single JSON document that is an array of all JSON files. This allows
// us to avoid posting multiple JSON files.
func makeJsonOfAllFiles(jsonBytes [][]byte) ([]json.RawMessage, error) {
catcher := grip.NewBasicCatcher()
post := []json.RawMessage{}
for _, j := range jsonBytes {
jsonRaw := json.RawMessage{}
if err := json.Unmarshal(j, &jsonRaw); err != nil {
catcher.Wrap(err, "unmarshalling JSON from file")
continue
}
post = append(post, jsonRaw)
}
return post, catcher.Resolve()
}