Publish location files for Mojo binaries uploaded from Chromium.

mojo/services/upload_service.py

Index: mojo/services/upload_service.py
diff --git a/mojo/services/upload_service.py b/mojo/services/upload_service.py
index ea528b3a39f7361fff98489773a6d997250c38a1..ca8e6c3ed0b02e7dddfb3b843adfea91274676ad 100755
--- a/mojo/services/upload_service.py
+++ b/mojo/services/upload_service.py
@@ -74,8 +74,19 @@ def upload_binary(service, binary_dir, platform, dry_run):
   absolute_binary_path = os.path.join(root_path, binary_dir, binary_name)
 
   if not should_zip:
+    # Upload the binary.
     dest = dest_dir + binary_name
     gsutil_cp(absolute_binary_path, dest, dry_run)
+
+    # Update the pointer to the service's location to point to the
+    # newly-uploaded binary.
+    service_location = dest.replace("gs://", "https://storage.googleapis.com/")
+    location_file = ("gs://mojo/services/" + platform + "/" + service +
+                     "_location")

[jamesr, 2015/02/24 22:07:19]

what information are we uploading here that isn't already in the URL?

[blundell, 2015/02/25 13:07:31]

gs://mojo/services/<platform>/<service>_location is a file that stores the URL
at which the binary for <service> can be found. The purpose of this file is to
allow a server app to serve the current versions of Mojo apps (e.g., apps
published from the Mojo and Chromium repos) without having to be aware of the
details of which apps are published from where, under which conventions for path
constructions, etc: When the server app receives a request for <service>, it can
read the current location of the <service> binary from
https://storage.googleapis.com/mojo/services/<platform>/<service>_location and
then return a redirect to that location.

If you're asking "what information is in the contents of
gs://mojo/services/<platform>/<service>_location that isn't embedded in that
URL", the answer is the version. The reason I chose to store the URL of the
binary rather than e.g. just the version in this pointer file is to allow
flexibility in exactly where/with what path construction conventions binaries
are uploaded without requiring changes to the server app.

+    with tempfile.NamedTemporaryFile() as tmp:
+      tmp.write(service_location)
+      tmp.flush()
+      gsutil_cp(tmp.name, location_file, dry_run)
     return
 
   # Zip the binary before uploading it to the cloud.