* [bitbake-devel][PATCH 1/2] asyncrpc: Add Client Pool object @ 2024-01-29 19:42 Joshua Watt 2024-01-29 19:42 ` [bitbake-devel][PATCH 2/2] hashserv: Add Client Pool Joshua Watt 0 siblings, 1 reply; 3+ messages in thread From: Joshua Watt @ 2024-01-29 19:42 UTC (permalink / raw) To: bitbake-devel; +Cc: Joshua Watt Adds an abstract base class that can be used to implement a pool of client connections. The class implements a thread that runs an async event loop, and allows derived classes to schedule work on the loop and wait for the work to be finished. Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> --- bitbake/lib/bb/asyncrpc/__init__.py | 2 +- bitbake/lib/bb/asyncrpc/client.py | 77 +++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+), 1 deletion(-) diff --git a/bitbake/lib/bb/asyncrpc/__init__.py b/bitbake/lib/bb/asyncrpc/__init__.py index a4371643d74..639e1607f8e 100644 --- a/bitbake/lib/bb/asyncrpc/__init__.py +++ b/bitbake/lib/bb/asyncrpc/__init__.py @@ -5,7 +5,7 @@ # -from .client import AsyncClient, Client +from .client import AsyncClient, Client, ClientPool from .serv import AsyncServer, AsyncServerConnection from .connection import DEFAULT_MAX_CHUNK from .exceptions import ( diff --git a/bitbake/lib/bb/asyncrpc/client.py b/bitbake/lib/bb/asyncrpc/client.py index 0d7cd85780d..a6228bb0ba0 100644 --- a/bitbake/lib/bb/asyncrpc/client.py +++ b/bitbake/lib/bb/asyncrpc/client.py @@ -10,6 +10,8 @@ import json import os import socket import sys +import contextlib +from threading import Thread from .connection import StreamConnection, WebsocketConnection, DEFAULT_MAX_CHUNK from .exceptions import ConnectionClosedError, InvokeError @@ -180,3 +182,78 @@ class Client(object): def __exit__(self, exc_type, exc_value, traceback): self.close() return False + + +class ClientPool(object): + def __init__(self, max_clients): + self.avail_clients = [] + self.num_clients = 0 + self.max_clients = max_clients + self.loop = None + self.client_condition = None + + @abc.abstractmethod + async def _new_client(self): + raise NotImplementedError("Must be implemented in derived class") + + def close(self): + if self.client_condition: + self.client_condition = None + + if self.loop: + self.loop.run_until_complete(self.__close_clients()) + self.loop.run_until_complete(self.loop.shutdown_asyncgens()) + self.loop.close() + self.loop = None + + def run_tasks(self, tasks): + if not self.loop: + self.loop = asyncio.new_event_loop() + + thread = Thread(target=self.__thread_main, args=(tasks,)) + thread.start() + thread.join() + + @contextlib.asynccontextmanager + async def get_client(self): + async with self.client_condition: + if self.avail_clients: + client = self.avail_clients.pop() + elif self.num_clients < self.max_clients: + self.num_clients += 1 + client = await self._new_client() + else: + while not self.avail_clients: + await self.client_condition.wait() + client = self.avail_clients.pop() + + try: + yield client + finally: + async with self.client_condition: + self.avail_clients.append(client) + self.client_condition.notify() + + def __thread_main(self, tasks): + async def process_task(task): + async with self.get_client() as client: + await task(client) + + asyncio.set_event_loop(self.loop) + if not self.client_condition: + self.client_condition = asyncio.Condition() + tasks = [process_task(t) for t in tasks] + self.loop.run_until_complete(asyncio.gather(*tasks)) + + async def __close_clients(self): + for c in self.avail_clients: + await c.close() + self.avail_clients = [] + self.num_clients = 0 + + def __enter__(self): + return self + + def __exit__(self, exc_type, exc_value, traceback): + self.close() + return False -- 2.34.1 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* [bitbake-devel][PATCH 2/2] hashserv: Add Client Pool 2024-01-29 19:42 [bitbake-devel][PATCH 1/2] asyncrpc: Add Client Pool object Joshua Watt @ 2024-01-29 19:42 ` Joshua Watt 2024-01-30 8:10 ` Alexandre Belloni 0 siblings, 1 reply; 3+ messages in thread From: Joshua Watt @ 2024-01-29 19:42 UTC (permalink / raw) To: bitbake-devel; +Cc: Joshua Watt Implements a Client Pool derived from the AsyncRPC client pool that allows querying for multiple equivalent hashes in parallel Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> --- bitbake/lib/hashserv/client.py | 80 ++++++++++++++++++++++++++++++++ bitbake/lib/hashserv/tests.py | 83 ++++++++++++++++++++++++++++++++++ 2 files changed, 163 insertions(+) diff --git a/bitbake/lib/hashserv/client.py b/bitbake/lib/hashserv/client.py index 35a97687fbe..41784b3fb6a 100644 --- a/bitbake/lib/hashserv/client.py +++ b/bitbake/lib/hashserv/client.py @@ -228,3 +228,83 @@ class Client(bb.asyncrpc.Client): def _get_async_client(self): return AsyncClient(self.username, self.password) + + +class ClientPool(bb.asyncrpc.ClientPool): + def __init__( + self, + address, + max_clients, + *, + username=None, + password=None, + become=None, + ): + super().__init__(max_clients) + self.address = address + self.username = username + self.password = password + self.become = become + + async def _new_client(self): + client = await create_async_client( + self.address, + username=self.username, + password=self.password, + ) + if self.become: + await client.become_user(self.become) + return client + + def _run_key_tasks(self, queries, call): + results = {key: None for key in queries.keys()} + + def make_task(key, args): + async def task(client): + nonlocal results + unihash = await call(client, args) + results[key] = unihash + + return task + + def gen_tasks(): + for key, args in queries.items(): + yield make_task(key, args) + + self.run_tasks(gen_tasks()) + return results + + def get_unihashes(self, queries): + """ + Query multiple unihashes in parallel. + + The queries argument is a dictionary with arbitrary key. The values + must be a tuple of (method, taskhash). + + Returns a dictionary with a corresponding key for each input key, and + the value is the queried unihash (which might be none if the query + failed) + """ + + async def call(client, args): + method, taskhash = args + return await client.get_unihash(method, taskhash) + + return self._run_key_tasks(queries, call) + + def unihashes_exist(self, queries): + """ + Query multiple unihash existence checks in parallel. + + The queries argument is a dictionary with arbitrary key. The values + must be a unihash. + + Returns a dictionary with a corresponding key for each input key, and + the value is True or False if the unihash is known by the server (or + None if there was a failure) + """ + + async def call(client, unihash): + return await client.unihash_exists(unihash) + + return self._run_key_tasks(queries, call) diff --git a/bitbake/lib/hashserv/tests.py b/bitbake/lib/hashserv/tests.py index 869f7636c53..d8cf4b421bb 100644 --- a/bitbake/lib/hashserv/tests.py +++ b/bitbake/lib/hashserv/tests.py @@ -8,6 +8,7 @@ from . import create_server, create_client from .server import DEFAULT_ANON_PERMS, ALL_PERMISSIONS from bb.asyncrpc import InvokeError +from .client import ClientPool import hashlib import logging import multiprocessing @@ -549,6 +550,88 @@ class HashEquivalenceCommonTests(object): # shares a taskhash with Task 2 self.assertClientGetHash(self.client, taskhash2, unihash2) + + def test_client_pool_get_unihashes(self): + TEST_INPUT = ( + # taskhash outhash unihash + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', 'afe240a439959ce86f5e322f8c208e1fedefea9e813f2140c81af866cc9edf7e','218e57509998197d570e2c98512d0105985dffc9'), + # Duplicated taskhash with multiple output hashes and unihashes. + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', 'ae9a7d252735f0dafcdb10e2e02561ca3a47314c'), + # Equivalent hash + ("044c2ec8aaf480685a00ff6ff49e6162e6ad34e1", '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', "def64766090d28f627e816454ed46894bb3aab36"), + ("e3da00593d6a7fb435c7e2114976c59c5fd6d561", "1cf8713e645f491eb9c959d20b5cae1c47133a292626dda9b10709857cbe688a", "3b5d3d83f07f259e9086fcb422c855286e18a57d"), + ('35788efcb8dfb0a02659d81cf2bfd695fb30faf9', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2cd'), + ('35788efcb8dfb0a02659d81cf2bfd695fb30fafa', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2ce'), + ('9d81d76242cc7cfaf7bf74b94b9cd2e29324ed74', '8470d56547eea6236d7c81a644ce74670ca0bbda998e13c629ef6bb3f0d60b69', '05d2a63c81e32f0a36542ca677e8ad852365c538'), + ) + EXTRA_QUERIES = ( + "6b6be7a84ab179b4240c4302518dc3f6", + ) + + with ClientPool(self.server_address, 10) as client_pool: + for taskhash, outhash, unihash in TEST_INPUT: + self.client.report_unihash(taskhash, self.METHOD, outhash, unihash) + + query = {idx: (self.METHOD, data[0]) for idx, data in enumerate(TEST_INPUT)} + for idx, taskhash in enumerate(EXTRA_QUERIES): + query[idx + len(TEST_INPUT)] = (self.METHOD, taskhash) + + result = client_pool.get_unihashes(query) + + self.assertDictEqual(result, { + 0: "218e57509998197d570e2c98512d0105985dffc9", + 1: "218e57509998197d570e2c98512d0105985dffc9", + 2: "218e57509998197d570e2c98512d0105985dffc9", + 3: "3b5d3d83f07f259e9086fcb422c855286e18a57d", + 4: "f46d3fbb439bd9b921095da657a4de906510d2cd", + 5: "f46d3fbb439bd9b921095da657a4de906510d2cd", + 6: "05d2a63c81e32f0a36542ca677e8ad852365c538", + 7: None, + }) + + def test_client_pool_unihash_exists(self): + TEST_INPUT = ( + # taskhash outhash unihash + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', 'afe240a439959ce86f5e322f8c208e1fedefea9e813f2140c81af866cc9edf7e','218e57509998197d570e2c98512d0105985dffc9'), + # Duplicated taskhash with multiple output hashes and unihashes. + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', 'ae9a7d252735f0dafcdb10e2e02561ca3a47314c'), + # Equivalent hash + ("044c2ec8aaf480685a00ff6ff49e6162e6ad34e1", '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', "def64766090d28f627e816454ed46894bb3aab36"), + ("e3da00593d6a7fb435c7e2114976c59c5fd6d561", "1cf8713e645f491eb9c959d20b5cae1c47133a292626dda9b10709857cbe688a", "3b5d3d83f07f259e9086fcb422c855286e18a57d"), + ('35788efcb8dfb0a02659d81cf2bfd695fb30faf9', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2cd'), + ('35788efcb8dfb0a02659d81cf2bfd695fb30fafa', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2ce'), + ('9d81d76242cc7cfaf7bf74b94b9cd2e29324ed74', '8470d56547eea6236d7c81a644ce74670ca0bbda998e13c629ef6bb3f0d60b69', '05d2a63c81e32f0a36542ca677e8ad852365c538'), + ) + EXTRA_QUERIES = ( + "6b6be7a84ab179b4240c4302518dc3f6", + ) + + result_unihashes = set() + + + with ClientPool(self.server_address, 10) as client_pool: + for taskhash, outhash, unihash in TEST_INPUT: + result = self.client.report_unihash(taskhash, self.METHOD, outhash, unihash) + result_unihashes.add(result["unihash"]) + + query = {} + expected = {} + + for _, _, unihash in TEST_INPUT: + idx = len(query) + query[idx] = unihash + expected[idx] = unihash in result_unihashes + + + for unihash in EXTRA_QUERIES: + idx = len(query) + query[idx] = unihash + expected[idx] = False + + result = client_pool.unihashes_exist(query) + self.assertDictEqual(result, expected) + + def test_auth_read_perms(self): admin_client = self.start_auth_server() -- 2.34.1 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [bitbake-devel][PATCH 2/2] hashserv: Add Client Pool 2024-01-29 19:42 ` [bitbake-devel][PATCH 2/2] hashserv: Add Client Pool Joshua Watt @ 2024-01-30 8:10 ` Alexandre Belloni 0 siblings, 0 replies; 3+ messages in thread From: Alexandre Belloni @ 2024-01-30 8:10 UTC (permalink / raw) To: Joshua Watt; +Cc: bitbake-devel bitbake-selftest failed: https://autobuilder.yoctoproject.org/typhoon/#/builders/80/builds/6308/steps/11/logs/stdio On 29/01/2024 12:42:08-0700, Joshua Watt wrote: > Implements a Client Pool derived from the AsyncRPC client pool that > allows querying for multiple equivalent hashes in parallel > > Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> > --- > bitbake/lib/hashserv/client.py | 80 ++++++++++++++++++++++++++++++++ > bitbake/lib/hashserv/tests.py | 83 ++++++++++++++++++++++++++++++++++ > 2 files changed, 163 insertions(+) > > diff --git a/bitbake/lib/hashserv/client.py b/bitbake/lib/hashserv/client.py > index 35a97687fbe..41784b3fb6a 100644 > --- a/bitbake/lib/hashserv/client.py > +++ b/bitbake/lib/hashserv/client.py > @@ -228,3 +228,83 @@ class Client(bb.asyncrpc.Client): > > def _get_async_client(self): > return AsyncClient(self.username, self.password) > + > + > +class ClientPool(bb.asyncrpc.ClientPool): > + def __init__( > + self, > + address, > + max_clients, > + *, > + username=None, > + password=None, > + become=None, > + ): > + super().__init__(max_clients) > + self.address = address > + self.username = username > + self.password = password > + self.become = become > + > + async def _new_client(self): > + client = await create_async_client( > + self.address, > + username=self.username, > + password=self.password, > + ) > + if self.become: > + await client.become_user(self.become) > + return client > + > + def _run_key_tasks(self, queries, call): > + results = {key: None for key in queries.keys()} > + > + def make_task(key, args): > + async def task(client): > + nonlocal results > + unihash = await call(client, args) > + results[key] = unihash > + > + return task > + > + def gen_tasks(): > + for key, args in queries.items(): > + yield make_task(key, args) > + > + self.run_tasks(gen_tasks()) > + return results > + > + def get_unihashes(self, queries): > + """ > + Query multiple unihashes in parallel. > + > + The queries argument is a dictionary with arbitrary key. The values > + must be a tuple of (method, taskhash). > + > + Returns a dictionary with a corresponding key for each input key, and > + the value is the queried unihash (which might be none if the query > + failed) > + """ > + > + async def call(client, args): > + method, taskhash = args > + return await client.get_unihash(method, taskhash) > + > + return self._run_key_tasks(queries, call) > + > + def unihashes_exist(self, queries): > + """ > + Query multiple unihash existence checks in parallel. > + > + The queries argument is a dictionary with arbitrary key. The values > + must be a unihash. > + > + Returns a dictionary with a corresponding key for each input key, and > + the value is True or False if the unihash is known by the server (or > + None if there was a failure) > + """ > + > + async def call(client, unihash): > + return await client.unihash_exists(unihash) > + > + return self._run_key_tasks(queries, call) > diff --git a/bitbake/lib/hashserv/tests.py b/bitbake/lib/hashserv/tests.py > index 869f7636c53..d8cf4b421bb 100644 > --- a/bitbake/lib/hashserv/tests.py > +++ b/bitbake/lib/hashserv/tests.py > @@ -8,6 +8,7 @@ > from . import create_server, create_client > from .server import DEFAULT_ANON_PERMS, ALL_PERMISSIONS > from bb.asyncrpc import InvokeError > +from .client import ClientPool > import hashlib > import logging > import multiprocessing > @@ -549,6 +550,88 @@ class HashEquivalenceCommonTests(object): > # shares a taskhash with Task 2 > self.assertClientGetHash(self.client, taskhash2, unihash2) > > + > + def test_client_pool_get_unihashes(self): > + TEST_INPUT = ( > + # taskhash outhash unihash > + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', 'afe240a439959ce86f5e322f8c208e1fedefea9e813f2140c81af866cc9edf7e','218e57509998197d570e2c98512d0105985dffc9'), > + # Duplicated taskhash with multiple output hashes and unihashes. > + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', 'ae9a7d252735f0dafcdb10e2e02561ca3a47314c'), > + # Equivalent hash > + ("044c2ec8aaf480685a00ff6ff49e6162e6ad34e1", '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', "def64766090d28f627e816454ed46894bb3aab36"), > + ("e3da00593d6a7fb435c7e2114976c59c5fd6d561", "1cf8713e645f491eb9c959d20b5cae1c47133a292626dda9b10709857cbe688a", "3b5d3d83f07f259e9086fcb422c855286e18a57d"), > + ('35788efcb8dfb0a02659d81cf2bfd695fb30faf9', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2cd'), > + ('35788efcb8dfb0a02659d81cf2bfd695fb30fafa', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2ce'), > + ('9d81d76242cc7cfaf7bf74b94b9cd2e29324ed74', '8470d56547eea6236d7c81a644ce74670ca0bbda998e13c629ef6bb3f0d60b69', '05d2a63c81e32f0a36542ca677e8ad852365c538'), > + ) > + EXTRA_QUERIES = ( > + "6b6be7a84ab179b4240c4302518dc3f6", > + ) > + > + with ClientPool(self.server_address, 10) as client_pool: > + for taskhash, outhash, unihash in TEST_INPUT: > + self.client.report_unihash(taskhash, self.METHOD, outhash, unihash) > + > + query = {idx: (self.METHOD, data[0]) for idx, data in enumerate(TEST_INPUT)} > + for idx, taskhash in enumerate(EXTRA_QUERIES): > + query[idx + len(TEST_INPUT)] = (self.METHOD, taskhash) > + > + result = client_pool.get_unihashes(query) > + > + self.assertDictEqual(result, { > + 0: "218e57509998197d570e2c98512d0105985dffc9", > + 1: "218e57509998197d570e2c98512d0105985dffc9", > + 2: "218e57509998197d570e2c98512d0105985dffc9", > + 3: "3b5d3d83f07f259e9086fcb422c855286e18a57d", > + 4: "f46d3fbb439bd9b921095da657a4de906510d2cd", > + 5: "f46d3fbb439bd9b921095da657a4de906510d2cd", > + 6: "05d2a63c81e32f0a36542ca677e8ad852365c538", > + 7: None, > + }) > + > + def test_client_pool_unihash_exists(self): > + TEST_INPUT = ( > + # taskhash outhash unihash > + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', 'afe240a439959ce86f5e322f8c208e1fedefea9e813f2140c81af866cc9edf7e','218e57509998197d570e2c98512d0105985dffc9'), > + # Duplicated taskhash with multiple output hashes and unihashes. > + ('8aa96fcffb5831b3c2c0cb75f0431e3f8b20554a', '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', 'ae9a7d252735f0dafcdb10e2e02561ca3a47314c'), > + # Equivalent hash > + ("044c2ec8aaf480685a00ff6ff49e6162e6ad34e1", '0904a7fe3dc712d9fd8a74a616ddca2a825a8ee97adf0bd3fc86082c7639914d', "def64766090d28f627e816454ed46894bb3aab36"), > + ("e3da00593d6a7fb435c7e2114976c59c5fd6d561", "1cf8713e645f491eb9c959d20b5cae1c47133a292626dda9b10709857cbe688a", "3b5d3d83f07f259e9086fcb422c855286e18a57d"), > + ('35788efcb8dfb0a02659d81cf2bfd695fb30faf9', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2cd'), > + ('35788efcb8dfb0a02659d81cf2bfd695fb30fafa', '2765d4a5884be49b28601445c2760c5f21e7e5c0ee2b7e3fce98fd7e5970796f', 'f46d3fbb439bd9b921095da657a4de906510d2ce'), > + ('9d81d76242cc7cfaf7bf74b94b9cd2e29324ed74', '8470d56547eea6236d7c81a644ce74670ca0bbda998e13c629ef6bb3f0d60b69', '05d2a63c81e32f0a36542ca677e8ad852365c538'), > + ) > + EXTRA_QUERIES = ( > + "6b6be7a84ab179b4240c4302518dc3f6", > + ) > + > + result_unihashes = set() > + > + > + with ClientPool(self.server_address, 10) as client_pool: > + for taskhash, outhash, unihash in TEST_INPUT: > + result = self.client.report_unihash(taskhash, self.METHOD, outhash, unihash) > + result_unihashes.add(result["unihash"]) > + > + query = {} > + expected = {} > + > + for _, _, unihash in TEST_INPUT: > + idx = len(query) > + query[idx] = unihash > + expected[idx] = unihash in result_unihashes > + > + > + for unihash in EXTRA_QUERIES: > + idx = len(query) > + query[idx] = unihash > + expected[idx] = False > + > + result = client_pool.unihashes_exist(query) > + self.assertDictEqual(result, expected) > + > + > def test_auth_read_perms(self): > admin_client = self.start_auth_server() > > -- > 2.34.1 > > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > View/Reply Online (#15804): https://lists.openembedded.org/g/bitbake-devel/message/15804 > Mute This Topic: https://lists.openembedded.org/mt/104039098/3617179 > Group Owner: bitbake-devel+owner@lists.openembedded.org > Unsubscribe: https://lists.openembedded.org/g/bitbake-devel/unsub [alexandre.belloni@bootlin.com] > -=-=-=-=-=-=-=-=-=-=-=- > -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-01-30 8:10 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2024-01-29 19:42 [bitbake-devel][PATCH 1/2] asyncrpc: Add Client Pool object Joshua Watt 2024-01-29 19:42 ` [bitbake-devel][PATCH 2/2] hashserv: Add Client Pool Joshua Watt 2024-01-30 8:10 ` Alexandre Belloni
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