# "Legacy" versus "Incoming blobs" pipeline comparison
# ====================================================
#
# This benchmarking aims to compare the legacy and new mail incoming pipeline,
# to asses performance improvements brought by the introduction of blobs.
#
# We use the following sizes in these tests:
#
#   - headers:  4   KB
#   - metadata: 0.1 KB
#   - flags:    0.5 KB
#   - content:  variable
#
# "Legacy" incoming mail pipeline:
#
#   - email arrives at MX.
#   - MX encrypts to public key and puts into couch.
#   - pubkey encrypted doc is synced to soledad client as "incoming".
#   - bitmask mail processes "incoming" and generates 3 metadocs + 1 payload
#     doc per message.
#   - soledad client syncs 4 documents back to server.
#
# "Incoming blobs" mail pipeline:
#
#   - email arrives at MX.
#   - MX encyrpts to public key and puts into soledad server.
#   - soledad server writes a blob to filesystem.
#   - soledad client gets the incoming blob from server and generates 3
#     metadocs + 1 blob.
#   - soledad client syncs 3 meta documents and 1 blob back to server.
#
# Some notes about the tests in this file:
#
#   - This is a simulation of the legacy and new incoming mail pipelines.
#     There is no actual mail processing operation done (i.e. no pubkey crypto,
#     no mail parsing), only usual soledad document manipulation and sync (with
#     local 1network and crypto).
#
#   - Each test simulates a whole incoming mail pipeline, including get new
#     incoming messages from server, create new documents that represent the
#     parsed message, and synchronize those back to the server.
#
#   - These tests are disabled by default because it doesn't make much sense to
#     have them run automatically for all commits in the repository. Instead,
#     we will run them manually for specific releases and store results and
#     analisys in a subfolder.

import base64
import pytest
import sys
import treq
import uuid

from io import BytesIO

from twisted.internet.defer import gatherResults
from twisted.internet.defer import returnValue
from twisted.internet.defer import DeferredSemaphore

from leap.soledad.common.blobs import Flags
from leap.soledad.client._db.blobs import BlobDoc


PARTS_SIZES = {
    'headers': 4000,
    'metadata': 100,
    'flags': 500,
}


#
# "Legacy" incoming mail pipeline.
#

@pytest.inlineCallbacks
def load_up_legacy(client, amount, content):
    # make sure there are no document from previous runs
    yield client.sync()
    _, docs = yield client.get_all_docs()
    deferreds = []
    for doc in docs:
        d = client.delete_doc(doc)
        deferreds.append(d)
    yield gatherResults(deferreds)
    yield client.sync()

    # create a bunch of local documents representing email messages
    deferreds = []
    for i in xrange(amount):
        deferreds.append(client.create_doc(content))
    yield gatherResults(deferreds)
    yield client.sync()


def process_incoming_docs(client, docs):
    deferreds = []
    for doc in docs:

        # create fake documents that represent message
        for name in PARTS_SIZES.keys():
            d = client.create_doc({name: doc.content[name]})
            deferreds.append(d)

        # create one document with content
        key = 'content'
        d = client.create_doc({key: doc.content[key]})
        deferreds.append(d)

        # delete the old incoming document
        d = client.delete_doc(doc)
        deferreds.append(d)

    # wait for all operatios to succeed
    yield gatherResults(deferreds)


def create_legacy_test(downloads, size):
    @pytest.inlineCallbacks
    @pytest.mark.skip(reason="avoid running for all commits")
    @pytest.mark.benchmark(group="test_legacy_vs_blobs")
    def test(soledad_client, txbenchmark_with_setup, payload):
        client = soledad_client()

        content = {'content': payload(size), 'incoming': True}
        for n, s in PARTS_SIZES.items():
            content[n] = payload(s)

        @pytest.inlineCallbacks
        def setup():
            yield load_up_legacy(client, downloads, content)
            returnValue(soledad_client(force_fresh_db=True))

        @pytest.inlineCallbacks
        def legacy_pipeline(client):
            yield client.create_index('incoming', 'bool(incoming)')
            yield client.sync()
            docs = yield client.get_from_index('incoming', '1')
            yield process_incoming_docs(client, docs)
            yield client.sync()

        yield txbenchmark_with_setup(setup, legacy_pipeline)
    return test


# ATTENTION: update the documentation in ../docs/benchmarks.rst if you change
# the number of docs or the doc sizes for the tests below.
test_legacy_10_1000k = create_legacy_test(10, 1000 * 1000)
test_legacy_100_100k = create_legacy_test(100, 100 * 1000)
test_legacy_1000_10k = create_legacy_test(1000, 10 * 1000)


#
# "Incoming blobs" mail pipeline:
#

# limit the amount of concurrent accesses to some resource
semaphore = DeferredSemaphore(5)


# deliver data to a user by using the incoming api at given url.
def deliver(url, user_uuid, token, data):
    auth = 'Token %s' % base64.b64encode('%s:%s' % (user_uuid, token))
    uri = "%s/incoming/%s/%s?namespace=MX" % (url, user_uuid, uuid.uuid4().hex)
    return treq.put(uri, headers={'Authorization': auth}, data=BytesIO(data))


# create a bunch of local documents representing email messages
def load_up_blobs(client, amount, data):
    deferreds = []
    for i in xrange(amount):
        d = semaphore.run(
            deliver, client.server_url, client.uuid, client.token, data)
        deferreds.append(d)
    return gatherResults(deferreds)


@pytest.inlineCallbacks
def download_incoming_blobs(client):
    # get list of pending incoming blobs
    pending = yield client.blobmanager.remote_list(
        namespace='MX', filter_flags=Flags.PENDING)

    # download incoming blobs
    deferreds = []
    for item in pending:
        d = semaphore.run(client.blobmanager.get, item, namespace='MX')
        deferreds.append(d)
    incoming = yield gatherResults(deferreds)
    returnValue((pending, incoming))


@pytest.inlineCallbacks
def create_local_data(client, incoming, payload):
    deferreds = []
    for item in incoming:
        for name, size in PARTS_SIZES.items():
            d = client.create_doc({name: payload(size)})
            deferreds.append(d)
        doc = BlobDoc(item, blob_id=uuid.uuid4().hex)
        size = sys.getsizeof(item)
        d = semaphore.run(
            client.blobmanager.put, doc, size, namespace='payload')
        deferreds.append(d)
    yield gatherResults(deferreds)


@pytest.inlineCallbacks
def delete_pending_from_server(client, pending):
    deferreds = []
    for item in pending:
        d = semaphore.run(client.blobmanager.delete, item, namespace='MX')
        deferreds.append(d)
    yield gatherResults(deferreds)


def create_blobs_test(downloads, size):
    @pytest.inlineCallbacks
    @pytest.mark.skip(reason="avoid running for all commits")
    @pytest.mark.benchmark(group="test_legacy_vs_blobs")
    def test(soledad_client, txbenchmark_with_setup, payload):
        client = soledad_client()
        blob_payload = payload(size)

        @pytest.inlineCallbacks
        def setup():
            yield load_up_blobs(client, downloads, blob_payload)
            returnValue(soledad_client(force_fresh_db=True))

        @pytest.inlineCallbacks
        def blobs_pipeline(client):
            pending, incoming = yield download_incoming_blobs(client)
            yield create_local_data(client, incoming, payload)
            yield delete_pending_from_server(client, pending)
            yield client.sync()
            yield client.blobmanager.send_missing(namespace='payload')

        yield txbenchmark_with_setup(setup, blobs_pipeline)
    return test


# ATTENTION: update the documentation in ../docs/benchmarks.rst if you change
# the number of docs or the doc sizes for the tests below.
test_blobs_10_1000k = create_blobs_test(10, 1000 * 1000)
test_blobs_100_100k = create_blobs_test(100, 100 * 1000)
test_blobs_1000_10k = create_blobs_test(1000, 10 * 1000)