Endpoint to print directly to server log

src/calibre/srv/code.py

@@ -4,7 +4,7 @@
 
 from __future__ import (unicode_literals, division, absolute_import,
                         print_function)
-import hashlib, random, zipfile
+import hashlib, random, zipfile, shutil, sys
 from json import load as load_json_file
 
 from calibre import as_unicode
@@ -33,6 +33,14 @@ def auto_reload(ctx, rd):
         rd.outheaders.set('Calibre-Auto-Reload-Port', type('')(auto_reload_port), replace_all=True)
     return lopen(P('content-server/autoreload.js'), 'rb')
 
+
+@endpoint('/console-print', methods=('POST',))
+def console_print(ctx, rd):
+    if not getattr(rd.opts, 'allow_console_print', False):
+        raise HTTPNotFound('console printing is not allowed')
+    shutil.copyfileobj(rd.request_body_file, sys.stdout)
+    return ''
+
 def get_basic_query_data(ctx, rd):
     db, library_id, library_map, default_library = get_library_data(ctx, rd)
     skeys = db.field_metadata.sortable_field_keys()
@@ -89,6 +97,7 @@ def interface_data(ctx, rd):
         'gui_last_modified_display_format':tweaks['gui_last_modified_display_format'],
         'use_roman_numerals_for_series_number': get_use_roman(),
         'translations': get_translations(),
+        'allow_console_print':getattr(rd.opts, 'allow_console_print', False),
     }
     ans['library_map'], ans['default_library'] = ctx.library_info(rd)
     ud = {}

src/calibre/srv/standalone.py

@@ -235,6 +235,7 @@ def main(args=sys.argv):
         except NoAutoReload as e:
             raise SystemExit(e.message)
     opts.auto_reload_port=int(os.environ.get('CALIBRE_AUTORELOAD_PORT', 0))
+    opts.allow_console_print = 'CALIBRE_ALLOW_CONSOLE_PRINT' in os.environ
     server=Server(libraries, opts)
     if opts.daemonize:
         if not opts.log and not iswindows:

src/pyj/ajax.pyj

@@ -99,6 +99,20 @@ def ajax_send(path, data, on_complete, on_progress=None, query=None, timeout=30*
     xhr.send(JSON.stringify(data))
     return xhr
 
+
+allow_console_print = False
+
+def set_allow_console_print(val):
+    nonlocal allow_console_print
+    allow_console_print = bool(val)
+
+def console_print(*args):
+    print(*args)
+    if allow_console_print:
+        data = ' '.join(map(str, args)) + '\n'
+        xhr = ajax('console-print', def():pass;, method='POST', progress_totals_needed=False)
+        xhr.send(data)
+
 # TODO: Implement AJAX based switch user by:
 # 1) POST to a logout URL with an incorrect username and password
 # 2) Have the server accept that incorrect username/password

src/pyj/srv.pyj

@@ -3,7 +3,7 @@
 from __python__ import hash_literals
 
 import initialize  # noqa: unused-import
-from ajax import ajax
+from ajax import ajax, set_allow_console_print
 from elementmaker import E
 from gettext import gettext as _, install
 from session import UserSessionData
@@ -20,6 +20,7 @@ def on_library_loaded(end_type, xhr, ev):
     if end_type is 'load':
         interface_data = JSON.parse(xhr.responseText)
         interface_data.main_js = main_js
+        set_allow_console_print(interface_data.allow_console_print)
         main_js = None
         script = document.getElementById('main_js')
         if script: