fix metalink size for url (#581)

* fix metalink size for url

* use ubuntu 18.04 in ci

Author: cehbrecht

.github/workflows/main.yml

@@ -4,7 +4,7 @@ on: [ push, pull_request ]
 
 jobs:
   main:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]

pywps/inout/basic.py

@@ -336,6 +336,11 @@ def url(self):
         import pathlib
         return pathlib.PurePosixPath(self.file).as_uri()
 
+    @property
+    def size(self):
+        """Length of the linked content in octets."""
+        return os.stat(self.file).st_size
+
     def _openmode(self, data=None):
         openmode = 'r'
         # in Python 3 we need to open binary files in binary mode.
@@ -483,6 +488,16 @@ def post_data(self):
     def post_data(self, value):
         self._post_data = value
 
+    @property
+    def size(self):
+        """Get content-length of URL without download"""
+        req = requests.head(self.url)
+        if req.ok:
+            size = int(req.headers.get('content-length', '0'))
+        else:
+            size = 0
+        return size
+
     @staticmethod
     def _openurl(href, data=None):
         """Open given href.

pywps/inout/outputs.py

@@ -361,7 +361,7 @@ def name(self):
     @property
     def size(self):
         """Length of the linked content in octets."""
-        return os.stat(self.file).st_size
+        return self._output.size
 
     @property
     def urls(self):

tests/test_inout.py

@@ -772,6 +772,12 @@ def metafile(self):
         mf._set_workdir(self.tmp_dir)
         return mf
 
+    def metafile_with_url(self):
+        mf = MetaFile('identifier', 'title', fmt=FORMATS.JSON)
+        mf.url = "https://pywps.org/"
+        mf._set_workdir(self.tmp_dir)
+        return mf
+
     def test_metafile(self):
         mf = self.metafile()
         self.assertEqual('identifier', mf.identity)
@@ -821,6 +827,11 @@ def test_hash(self):
         ml4.checksums = True
         assert 'hash' in ml4.xml
 
+    def test_size(self):
+        ml4 = self.metalink4()
+        ml4.append(self.metafile_with_url())
+        assert 'size' in ml4.xml
+
 
 def load_tests(loader=None, tests=None, pattern=None):
     if not loader: