feat: parse url with js plugins support (#96)

* feat: WIP. add parser functionality and text message handling

* fix: use json to marshal js result

* feat: add metadata handling and version validation for jsParser

* refactor: rename parser package to parsers and restructure parser handling

* refactor: core code struct and impl parse task handle

* feat: impl parsed download

* fix: seek cache file when processing tph picture

* feat: implement parsed task handling and progress tracking

* feat: enhance task processing with concurrency control and progress tracking

* feat: add resource ID generation and improve resource processing handling

* feat: improve message formatting in parsed text and progress completion

* feat: add example js plugin

* feat: implement Twitter parser

* fix: twitter parse video json decode error

* feat: impl stream mode for parse task

core/tasks/parsed/execute.go

@@ -0,0 +1,139 @@
+package parsed
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"path"
+	"path/filepath"
+
+	"github.com/charmbracelet/log"
+	"github.com/duke-git/lancet/v2/retry"
+	"github.com/krau/SaveAny-Bot/common/utils/fsutil"
+	"github.com/krau/SaveAny-Bot/common/utils/ioutil"
+	"github.com/krau/SaveAny-Bot/config"
+	"github.com/krau/SaveAny-Bot/pkg/enums/ctxkey"
+	"github.com/krau/SaveAny-Bot/pkg/parser"
+	"golang.org/x/sync/errgroup"
+)
+
+func (t *Task) Execute(ctx context.Context) error {
+	logger := log.FromContext(ctx)
+	logger.Infof("Starting Parsed item task %s", t.item.Title)
+	if t.progress != nil {
+		t.progress.OnStart(ctx, t)
+	}
+	eg, gctx := errgroup.WithContext(ctx)
+	eg.SetLimit(config.Cfg.Workers)
+	for _, resource := range t.item.Resources {
+		eg.Go(func() error {
+			t.processingMu.RLock()
+			if t.processing[resource.ID()] != nil {
+				return fmt.Errorf("resource %s is already being processed", resource.ID())
+			}
+			t.processingMu.RUnlock()
+			t.processingMu.Lock()
+			t.processing[resource.ID()] = &resource
+			t.processingMu.Unlock()
+			defer func() {
+				t.processingMu.Lock()
+				delete(t.processing, resource.URL)
+				t.processingMu.Unlock()
+			}()
+			err := t.processResource(gctx, resource)
+			t.downloaded.Add(1)
+			if errors.Is(err, context.Canceled) {
+				logger.Debug("Resource processing canceled")
+				return err
+			}
+			if err != nil {
+				logger.Errorf("Error processing resource %s: %v", resource.URL, err)
+				return fmt.Errorf("failed to process resource %s: %w", resource.URL, err)
+			}
+			return nil
+		})
+	}
+	err := eg.Wait()
+	if err != nil {
+		logger.Errorf("Error during Parsed item task execution: %v", err)
+	} else {
+		logger.Infof("Parsed item task %s completed successfully", t.item.Title)
+	}
+	if t.progress != nil {
+		t.progress.OnDone(ctx, t, err)
+	}
+	return err
+}
+
+func (t *Task) processResource(ctx context.Context, resource parser.Resource) error {
+	logger := log.FromContext(ctx)
+	err := retry.Retry(func() error {
+		req, err := http.NewRequestWithContext(ctx, http.MethodGet, resource.URL, nil)
+		if err != nil {
+			return err
+		}
+		if resource.Headers != nil {
+			for k, v := range resource.Headers {
+				req.Header.Set(k, v)
+			}
+		}
+		resp, err := t.httpClient.Do(req)
+		if err != nil {
+			return fmt.Errorf("failed to download resource %s: %w", resource.URL, err)
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			return fmt.Errorf("failed to download resource %s: %s", resource.URL, resp.Status)
+		}
+		ctx = context.WithValue(ctx, ctxkey.ContentLength, func() int64 {
+			if resource.Size > 0 {
+				return resource.Size
+			}
+			return resp.ContentLength
+		}())
+		if t.stream {
+			return t.Stor.Save(ctx, resp.Body, path.Join(t.StorPath, resource.Filename))
+		}
+		cacheFile, err := fsutil.CreateFile(filepath.Join(config.Cfg.Temp.BasePath,
+			fmt.Sprintf("resource_%s_%s", t.ID, resource.Filename)))
+		if err != nil {
+			return fmt.Errorf("failed to create cache file for resource %s: %w", resource.URL, err)
+		}
+		defer func() {
+			if err := cacheFile.CloseAndRemove(); err != nil {
+				logger.Errorf("Failed to close and remove cache file: %v", err)
+			}
+		}()
+		wr := ioutil.NewProgressWriter(cacheFile, func(n int) {
+			t.downloadedBytes.Add(int64(n))
+			if t.progress != nil {
+				t.progress.OnProgress(ctx, t)
+			}
+		})
+
+		copyResultCh := make(chan error, 1)
+		go func() {
+			_, err := io.Copy(wr, resp.Body)
+			copyResultCh <- err
+		}()
+		select {
+		case err := <-copyResultCh:
+			if err != nil {
+				return fmt.Errorf("failed to copy resource %s to cache file: %w", resource.URL, err)
+			}
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+		_, err = cacheFile.Seek(0, 0)
+		if err != nil {
+			return fmt.Errorf("failed to seek cache file for resource %s: %w", resource.URL, err)
+		}
+		return t.Stor.Save(ctx, cacheFile, path.Join(t.StorPath, resource.Filename))
+	}, retry.Context(ctx), retry.RetryTimes(uint(config.Cfg.Retry)))
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+	return err
+}