import pytest
from io import BytesIO
from leap.soledad.server._blobs import FilesystemBlobsBackend
from twisted.internet import defer
from twisted.web.client import FileBodyProducer


def create_write_test(amount, size):

    @pytest.inlineCallbacks
    @pytest.mark.benchmark(group='test_blobs_fs_backend_write')
    def test(txbenchmark, payload, tmpdir):
        """
        Write many blobs of the same size to the filesystem backend.
        """
        backend = FilesystemBlobsBackend(blobs_path=tmpdir.strpath)
        data = payload(size)
        semaphore = defer.DeferredSemaphore(100)
        deferreds = []
        for i in xrange(amount):
            producer = FileBodyProducer(BytesIO(data))
            d = semaphore.run(backend.write_blob, 'user', str(i), producer)
            deferreds.append(d)
        yield txbenchmark(defer.gatherResults, deferreds)

    return test


test_blobs_fs_backend_write_10_10000k = create_write_test(10, 10000 * 1000)
test_blobs_fs_backend_write_100_1000k = create_write_test(100, 1000 * 1000)
test_blobs_fs_backend_write_1000_100k = create_write_test(1000, 100 * 1000)
test_blobs_fs_backend_write_10000_10k = create_write_test(10000, 10 * 1000)


class DevNull(object):

    def write(self, data):
        pass


def create_read_test(amount, size):

    @pytest.inlineCallbacks
    @pytest.mark.benchmark(group='test_blobs_fs_backend_read')
    def test(txbenchmark, payload, tmpdir):
        """
        Read many blobs of the same size from the filesystem backend.
        """
        backend = FilesystemBlobsBackend(blobs_path=tmpdir.strpath)
        data = payload(size)

        # first write blobs to the backend...
        semaphore = defer.DeferredSemaphore(100)
        deferreds = []
        for i in xrange(amount):
            producer = FileBodyProducer(BytesIO(data))
            d = semaphore.run(backend.write_blob, 'user', str(i), producer)
            deferreds.append(d)
        yield defer.gatherResults(deferreds)

        # ... then measure the read operation
        deferreds = []
        for i in xrange(amount):
            consumer = DevNull()
            d = semaphore.run(backend.read_blob, 'user', str(i), consumer)
            deferreds.append(d)
        yield txbenchmark(defer.gatherResults, deferreds)

    return test


test_blobs_fs_backend_read_10_10000k = create_read_test(10, 10000 * 1000)
test_blobs_fs_backend_read_100_1000k = create_read_test(100, 1000 * 1000)
test_blobs_fs_backend_read_1000_100k = create_read_test(1000, 100 * 1000)
test_blobs_fs_backend_read_10000_10k = create_read_test(10000, 10 * 1000)