Golang Package.Synopsis方法代碼示例

// Reindex gets all the packages in database and put them into the search index.
// This will update the search index with the path, synopsis, score, import counts
// of all the packages in the database.
func (db *Database) Reindex(ctx context.Context) error {
	c := db.Pool.Get()
	defer c.Close()

	idx, err := search.Open("packages")
	if err != nil {
		return fmt.Errorf("database: failed to open packages: %v", err)
	}
	npkgs := 0
	for {
		// Get 200 packages from the nextCrawl set each time. Use npkgs as a cursor
		// to store the current position we actually indexed. Retry from the cursor
		// position if we received a timeout error from app engine.
		values, err := redis.Values(c.Do(
			"SORT", "nextCrawl",
			"LIMIT", strconv.Itoa(npkgs), "200",
			"GET", "pkg:*->path",
			"GET", "pkg:*->synopsis",
			"GET", "pkg:*->score",
		))
		if err != nil {
			return err
		}
		if len(values) == 0 {
			break // all done
		}

		// The Search API should support put in batches of up to 200 documents,
		// the Go version of this API does not support this yet.
		// TODO(shantuo): Put packages in batch operations.
		for ; len(values) > 0; npkgs++ {
			var pdoc doc.Package
			var score float64
			values, err = redis.Scan(values, &pdoc.ImportPath, &pdoc.Synopsis, &score)
			if err != nil {
				return err
			}
			// There are some corrupted data in our current database
			// that causes an error when putting the package into the
			// search index which only supports UTF8 encoding.
			if !utf8.ValidString(pdoc.Synopsis) {
				pdoc.Synopsis = ""
			}
			id, n, err := pkgIDAndImportCount(c, pdoc.ImportPath)
			if err != nil {
				return err
			}
			if _, err := idx.Put(ctx, id, &Package{
				Path:        pdoc.ImportPath,
				Synopsis:    pdoc.Synopsis,
				Score:       score,
				ImportCount: n,
			}); err != nil {
				if appengine.IsTimeoutError(err) {
					log.Printf("App Engine timeout: %v. Continue...", err)
					break
				}
				return fmt.Errorf("Failed to put index %s: %v", id, err)
			}
		}
	}
	log.Printf("%d packages are reindexed", npkgs)
	return nil
}