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;;;; downloader.lisp
(in-package #:vampire)
(defvar *dl-cluster*
nil)
(defun start-downloader-service (&key (count 5))
(setf *dl-cluster* (or *dl-cluster* (legion:make-cluster count 'run-job)))
(legion:start *dl-cluster*))
(defun run-job (thunk)
(funcall thunk))
(defun add-fetch-track-job (url ok err)
(legion:add-job
*dl-cluster*
(lambda ()
(if-let (track (download-media url))
(funcall ok track)
(funcall err url)))))
(defun trackinfo-file (dir name)
(merge-pathnames
(format nil "~a.info.json" name)
dir))
(defun trackmedia-file (dir)
(find-if
(lambda (path)
(not (string-equal "json" (pathname-type path))))
(uiop:directory-files dir)))
(defun trackinfo (path)
"Returns a trackinfo object - a list whose first member is a path to
a file and whose CDR is a PLIST of attributes to pass
to (make-instance 'track ...)"
(with-plist ((title :|title|)
(album :|album|)
(codec :|acodec|)
(artist :|artist|)
(dur :|duration|)
(thumbs :|thumbnails|)
(source :|webpage_url|))
(jonathan:parse (alexandria:read-file-into-string path))
(with-plist ((url :|url|)) (first thumbs)
(list
:source source
:title title
:album album
:codec codec
:artist artist
:duration dur
:thumb-url url))))
(defun download-media (url)
(with-temp-dir (tmpdir)
(handler-case
(let* ((tmpname
(default-name "media"))
(trackinfo-file
(trackinfo-file tmpdir tmpname)))
(uiop:run-program
(format nil "youtube-dl --write-info-json -x -o \"~a/~a.%(ext)s\" ~a"
tmpdir tmpname url))
(when (uiop:file-exists-p trackinfo-file)
(let ((info
(trackinfo trackinfo-file)))
(new-track
(trackmedia-file tmpdir)
info))))
(error (e)
(format t "ERROR: ~a~%" e)
nil))))
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