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worker.go
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worker.go
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package worker
import (
"bytes"
"encoding/json"
"fmt"
"io"
"log"
"mime/multipart"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/mxschmitt/try-playwright/internal/workertypes"
"github.com/streadway/amqp"
)
type executionHandler func(worker *Worker, code string) error
type Worker struct {
options *WorkerExectionOptions
channel *amqp.Channel
tmpDir string
output *bytes.Buffer
files []string
}
var queue_name = fmt.Sprintf("rpc_queue_%s", os.Getenv("WORKER_ID"))
func (w *Worker) Run() {
if w.options.ExecutionDirectory != "" {
w.tmpDir = w.options.ExecutionDirectory
} else {
var err error
w.tmpDir, err = os.MkdirTemp("", "try-pw")
if err != nil {
log.Fatalf("could not create tmp dir: %v", err)
}
}
conn, err := amqp.Dial(os.Getenv("AMQP_URL"))
if err != nil {
log.Fatalf("could not dial to amqp: %v", err)
}
defer conn.Close()
w.channel, err = conn.Channel()
if err != nil {
log.Fatalf("could not open a channel: %v", err)
}
msgs, err := w.channel.Consume(
queue_name,
"", // consumer
false, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
if err != nil {
log.Fatalf("could not consume channel messages: %v", err)
}
if err := w.consumeMessage(msgs); err != nil {
log.Fatalf("could not consume messages: %v", err)
}
defer w.channel.Close()
}
func (w *Worker) ExecCommand(name string, args ...string) error {
path, err := exec.LookPath(name)
if err != nil {
return fmt.Errorf("could not command lookup path: %w", err)
}
collector, err := newFilesCollector(w.tmpDir, w.options.IgnoreFilePatterns)
if err != nil {
return fmt.Errorf("could not create file collector: %w", err)
}
workerProxy := os.Getenv("WORKER_HTTP_PROXY")
c := exec.Cmd{
Dir: w.tmpDir,
Path: path,
Args: append([]string{name}, args...),
Stdout: io.MultiWriter(os.Stdout, w.output),
Stderr: io.MultiWriter(os.Stderr, w.output),
Env: append(
os.Environ(),
fmt.Sprintf("http_proxy=%s", workerProxy),
fmt.Sprintf("HTTPS_PROXY=%s", workerProxy),
),
}
if err := c.Run(); err != nil {
return fmt.Errorf("could not run command: %s", w.options.TransformOutput(w.output.String()))
}
files, err := collector.Collect()
if err != nil {
return fmt.Errorf("could not collect files: %w", err)
}
w.files = append(w.files, files...)
return nil
}
func (w *Worker) consumeMessage(incomingMessages <-chan amqp.Delivery) error {
incomingMessage := <-incomingMessages
var incomingMessageParsed *workertypes.WorkerRequestPayload
if err := json.Unmarshal(incomingMessage.Body, &incomingMessageParsed); err != nil {
return fmt.Errorf("could not parse incoming amqp message: %w", err)
}
outgoingMessage := &workertypes.WorkerResponsePayload{Version: os.Getenv("PLAYWRIGHT_VERSION")}
if err := w.options.Handler(w, incomingMessageParsed.Code); err != nil {
outgoingMessage.Success = false
outgoingMessage.Error = err.Error()
} else {
outgoingMessage.Success = true
outgoingMessage.Output = w.options.TransformOutput(w.output.String())
outgoingMessage.Files, err = w.uploadFiles()
if err != nil {
return fmt.Errorf("could not upload files: %w", err)
}
}
outgoingMessageBody, err := json.Marshal(outgoingMessage)
if err != nil {
return fmt.Errorf("could not marshal outgoing message payload: %w", err)
}
err = w.channel.Publish(
"", // exchange
incomingMessage.ReplyTo, // routing key
false, // mandatory
false, // immediate
amqp.Publishing{
ContentType: "application/json",
CorrelationId: incomingMessage.CorrelationId,
Body: outgoingMessageBody,
})
if err != nil {
return fmt.Errorf("could not publish message: %w", err)
}
if err := incomingMessage.Ack(false); err != nil {
return fmt.Errorf("could not ack message: %w", err)
}
return nil
}
var uploadFilesEndpoint = fmt.Sprintf("%s/api/v1/file/upload", os.Getenv("FILE_SERVICE_URL"))
func (w *Worker) uploadFiles() ([]workertypes.File, error) {
var b bytes.Buffer
requestWriter := multipart.NewWriter(&b)
for i, filePath := range w.files {
fw, err := requestWriter.CreateFormFile(fmt.Sprintf("file-%d", i), filepath.Base(filePath))
if err != nil {
return nil, fmt.Errorf("could not create form file: %w", err)
}
f, err := os.Open(filePath)
if err != nil {
return nil, fmt.Errorf("could not open file: %w", err)
}
defer f.Close()
if _, err = io.Copy(fw, f); err != nil {
return nil, fmt.Errorf("could not copy file into form file writer %w", err)
}
}
if err := requestWriter.Close(); err != nil {
return nil, fmt.Errorf("could not close multipart.Writer: %w", err)
}
req, err := http.NewRequest("POST", uploadFilesEndpoint, &b)
if err != nil {
return nil, fmt.Errorf("could not create new request: %w", err)
}
req.Header.Set("Content-Type", requestWriter.FormDataContentType())
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("could not execute request: %w", err)
}
if res.StatusCode != http.StatusCreated {
return nil, fmt.Errorf("not expected status: %d", res.StatusCode)
}
var respBody []workertypes.File
if err := json.NewDecoder(res.Body).Decode(&respBody); err != nil {
return nil, fmt.Errorf("could not decode upload file response: %w", err)
}
return respBody, nil
}
type WorkerExectionOptions struct {
Handler executionHandler
ExecutionDirectory string
TransformOutput func(output string) string
IgnoreFilePatterns []string
}
func NewWorker(options *WorkerExectionOptions) *Worker {
if options.TransformOutput == nil {
options.TransformOutput = DefaultTransformOutput
}
return &Worker{
options: options,
output: new(bytes.Buffer),
files: make([]string, 0),
}
}
func DefaultTransformOutput(output string) string {
return strings.TrimRight(output, "\n")
}