boost/build: try multiple mirrors

1 files changed, 24 insertions, 8 deletions

diff --git a/boost/build/build.py b/boost/build/build.py
index c4b008c..0450593 100755
--- a/boost/build/build.py
+++ b/boost/build/build.py
@@ -205,11 +205,19 @@ class BoostVersion:
     def archive_name(self):
         return f'{self.dir_name}{self.archive_ext}'
 
-    def get_download_url(self):
-        if self._impl < _Version(1, 63, 0):
-            return f'https://sourceforge.net/projects/boost/files/boost/{self}/{self.archive_name}/download'
+    def _get_bintray_url(self):
         return f'https://dl.bintray.com/boostorg/release/{self}/source/{self.archive_name}'
 
+    def _get_sourceforge_url(self):
+        return f'https://sourceforge.net/projects/boost/files/boost/{self}/{self.archive_name}/download'
+
+    def get_download_urls(self):
+        if self._impl < _Version(1, 63, 0):
+            # For versions older than 1.63.0, SourceForge is the only option:
+            return [self._get_sourceforge_url()]
+        # Otherwise, Bintray is preferred (the official website links to it).
+        return [self._get_bintray_url(), self._get_sourceforge_url()]
+
 
 class BoostArchive:
     def __init__(self, version, path):
@@ -238,12 +246,20 @@ class ArchiveStorage(abc.ABC):
             yield BoostArchive(version, path)
             return
 
-        url = version.get_download_url()
-        logging.info('Download URL: %s', url)
+        urls = version.get_download_urls()
 
-        with urllib.request.urlopen(url) as request:
-            with self.write_archive(version, request.read()) as path:
-                yield BoostArchive(version, path)
+        for url in urls:
+            logging.info('Trying URL: %s', url)
+            try:
+                with urllib.request.urlopen(url) as request:
+                    with self.write_archive(version, request.read()) as path:
+                        yield BoostArchive(version, path)
+                        return
+            except urllib.request.URLError as e:
+                logging.error("Couldn't download from this mirror, an error occured:")
+                logging.exception(e)
+
+        raise RuntimeError("Couldn't download Boost from any of the mirrors")
 
     @abc.abstractmethod
     def get_archive(self, version):