[benchmark] add read/write benchmark for blobs fs backend

tests/benchmarks/test_blobs_fs_backend.py

+import pytest
+from io import BytesIO
+from leap.soledad.server._blobs import FilesystemBlobsBackend
+from twisted.internet import defer
+
+
+def create_write_test(amount, size):
+
+    @pytest.inlineCallbacks
+    @pytest.mark.benchmark(group='test_blobs_fs_backend_write')
+    def test(txbenchmark, payload, tmpdir):
+        backend = FilesystemBlobsBackend(blobs_path=tmpdir.strpath)
+        data = payload(size)
+        deferreds = []
+        for i in xrange(amount):
+            fd = BytesIO(data)
+            d = backend.write_blob('user', str(i), fd)
+            deferreds.append(d)
+        yield txbenchmark(defer.gatherResults, deferreds)
+
+    return test
+
+
+test_blobs_fs_backend_write_1_10000k = create_write_test(1, 10000 * 1000)
+test_blobs_fs_backend_write_10_1000k = create_write_test(10, 1000 * 1000)
+test_blobs_fs_backend_write_100_100k = create_write_test(100, 100 * 1000)
+test_blobs_fs_backend_write_1000_10k = create_write_test(1000, 10 * 1000)
+
+
+def create_read_test(amount, size):
+
+    @pytest.inlineCallbacks
+    @pytest.mark.benchmark(group='test_blobs_fs_backend_read')
+    def test(txbenchmark, payload, tmpdir):
+        backend = FilesystemBlobsBackend(blobs_path=tmpdir.strpath)
+        data = payload(size)
+
+        # first write blobs to the backend...
+        deferreds = []
+        for i in xrange(amount):
+            fd = BytesIO(data)
+            d = backend.write_blob('user', str(i), fd)
+            deferreds.append(d)
+        yield defer.gatherResults(deferreds)
+
+        # ... then measure the read operation
+        deferreds = []
+        for i in xrange(amount):
+            d = backend.read_blob('user', str(i))
+            d.addCallback(lambda fd: fd.read())
+            deferreds.append(d)
+        yield txbenchmark(defer.gatherResults, deferreds)
+
+    return test
+
+
+test_blobs_fs_backend_read_1_10000k = create_read_test(1, 10000 * 1000)
+test_blobs_fs_backend_read_10_1000k = create_read_test(10, 1000 * 1000)
+test_blobs_fs_backend_read_100_100k = create_read_test(100, 100 * 1000)
+test_blobs_fs_backend_read_1000_10k = create_read_test(1000, 10 * 1000)