make S3 caching significantly more generic

.travis.yml

@@ -6,9 +6,9 @@ before_install:
 install:
   - if [ "$TWBS_TEST" = validate-html ]; then time gem install jekyll; fi
   - time npm install -g grunt-cli
-  - time ./test-infra/node_modules_cache.py download || time npm install
+  - time ./test-infra/node_modules_cache.py download package.json ./node_modules || time npm install
 after_script:
-  - if [ "$TWBS_TEST" = core ]; then time ./test-infra/node_modules_cache.py upload; fi
+  - if [ "$TWBS_TEST" = core ]; then time ./test-infra/node_modules_cache.py upload package.json ./node_modules; fi
 env:
   global:
     - SAUCE_USERNAME: bootstrap

test-infra/node_modules_cache.py

@@ -3,7 +3,7 @@ from __future__ import absolute_import, unicode_literals, print_function, divisi
 
 from sys import argv
 from os import environ, stat, remove as _delete_file
-from os.path import isfile
+from os.path import isfile, dirname, basename, abspath
 from hashlib import sha256
 from subprocess import check_call as run
 
@@ -12,7 +12,6 @@ from boto.s3.key import Key
 from boto.exception import S3ResponseError
 
 
-NODE_MODULES_TARBALL = 'node_modules.tar.gz'
 NEED_TO_UPLOAD_MARKER = '.need-to-upload'
 BYTES_PER_MB = 1024 * 1024
 try:
@@ -25,7 +24,9 @@ def _sha256_of_file(filename):
     hasher = sha256()
     with open(filename, 'rb') as input_file:
         hasher.update(input_file.read())
-    return hasher.hexdigest()
+    file_hash = hasher.hexdigest()
+    print('sha256({}) = {}'.format(filename, file_hash))
+    return file_hash
 
 
 def _delete_file_quietly(filename):
@@ -35,52 +36,71 @@ def _delete_file_quietly(filename):
         pass
 
 
-def _tarball_size():
-    kib = stat(NODE_MODULES_TARBALL).st_size // BYTES_PER_MB
+def _tarball_size(directory):
+    kib = stat(_tarball_filename_for(directory)).st_size // BYTES_PER_MB
     return "{} MiB".format(kib)
 
 
+def _tarball_filename_for(directory):
+    return abspath('./{}.tar.gz'.format(basename(directory)))
+
+
+def _create_tarball(directory):
+    print("Creating tarball of {}...".format(directory))
+    run(['tar', '-czf', _tarball_filename_for(directory), '-C', dirname(directory), basename(directory)])
+
+
+def _extract_tarball(directory):
+    print("Extracting tarball of {}...".format(directory))
+    run(['tar', '-xzf', _tarball_filename_for(directory), '-C', dirname(directory)])
+
+
+def download(directory):
+    _delete_file_quietly(NEED_TO_UPLOAD_MARKER)
+    try:
+        print("Downloading {} tarball from S3...".format(basename(directory)))
+        key.get_contents_to_filename(_tarball_filename_for(directory))
+    except S3ResponseError as err:
+        open(NEED_TO_UPLOAD_MARKER, 'a').close()
+        print(err)
+        raise SystemExit("Cached {} download failed!".format(basename(directory)))
+    print("Downloaded {}.".format(_tarball_size(directory)))
+    _extract_tarball(directory)
+    print("{} successfully installed from cache.".format(directory))
+
+
+def upload(directory):
+    _create_tarball(directory)
+    print("Uploading {} tarball to S3... ({})".format(basename(directory), _tarball_size(directory)))
+    key.set_contents_from_filename(_tarball_filename_for(directory))
+    print("{} cache successfully updated.".format(directory))
+    _delete_file_quietly(NEED_TO_UPLOAD_MARKER)
+
+
 if __name__ == '__main__':
     # Uses environment variables:
     #   AWS_ACCESS_KEY_ID - AWS Access Key ID
     #   AWS_SECRET_ACCESS_KEY - AWS Secret Access Key
     argv.pop(0)
-    if len(argv) != 1:
-        raise SystemExit("USAGE: node_modules_cache.py <download | upload>")
-    mode = argv.pop()
+    if len(argv) != 3:
+        raise SystemExit("USAGE: node_modules_cache.py <download | upload> <dependencies file> <directory>")
+    mode, dependencies_file, directory = argv
 
     conn = S3Connection()
     bucket = conn.lookup(BUCKET_NAME)
     if bucket is None:
         raise SystemExit("Could not access bucket!")
 
-    package_json_hash = _sha256_of_file('package.json')
-    print('sha256(package.json) = ' + package_json_hash)
+    dependencies_file_hash = _sha256_of_file(dependencies_file)
 
-    key = Key(bucket, package_json_hash)
+    key = Key(bucket, dependencies_file_hash)
     key.storage_class = 'REDUCED_REDUNDANCY'
 
     if mode == 'download':
-        _delete_file_quietly(NEED_TO_UPLOAD_MARKER)
-        try:
-            print("Downloading tarball from S3...")
-            key.get_contents_to_filename(NODE_MODULES_TARBALL)
-        except S3ResponseError as err:
-            open(NEED_TO_UPLOAD_MARKER, 'a').close()
-            print(err)
-            raise SystemExit("Cached node_modules download failed!")
-        print("Downloaded {}.".format(_tarball_size()))
-        print("Extracting tarball...")
-        run(['tar', 'xzf', NODE_MODULES_TARBALL])
-        print("node_modules successfully installed from cache.")
+        download(directory)
     elif mode == 'upload':
-        if isfile(NEED_TO_UPLOAD_MARKER):
-            print("Creating tarball...")
-            run(['tar', 'czf', NODE_MODULES_TARBALL, 'node_modules'])
-            print("Uploading tarball to S3... ({})".format(_tarball_size()))
-            key.set_contents_from_filename(NODE_MODULES_TARBALL)
-            print("node_modules cache successfully updated.")
-            _delete_file_quietly(NEED_TO_UPLOAD_MARKER)
+        if isfile(NEED_TO_UPLOAD_MARKER):  # FIXME
+            upload(directory)
         else:
             print("No need to upload anything.")
     else: