Locust࣮ફฤ: PythonͰॻ͘ෛՙࢼݧҰ໰Ұ౴ ฏ੉ ୡ໵ / @TatchNicolas

ฏ੉ୡ໵!5BUDI/JDPMBT ೥͔Β+9௨৴ࣾɻ 
 
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"HFOEB 1.Locustͱ͸ʁ 2.͜ΕɺLocustͰͲ͏΍Δͷʁ 2.1.Ϩεϙϯεͷৄࡉͳ֬ೝ 2.2.ςετσʔλͷॳظԽ 2.3.ίϚϯυϥΠϯ͔Βͷىಈ 2.4.Ϋϥελߏ੒Ͱͷىಈ 3.σϞɾ·ͱΊ

-PDVTUͱ͸ʁ 8IBU`T-PDVTU

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͜Εɺ-PDVTUͰͲ͏΍Δͷʁ )PXUPEP9XJUI-PDVTU

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app locustfile.pyΛॻ͘ 
 Write locustfile.py

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app Run locust

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app ݁ՌΛݟͯϘτϧωοΫΛݟ͚ͭΔ 
 Check results and find bottlenecks

ෛՙࢼݧͷྲྀΕ4UFQTUPSVOMPBEUFTUJOH ໨ඪઃఆ 
 Set objective ςετઃܭ 
 Write scenario ςετ࣮ࢪ Run tests ݁Ռ෼ੳ Check results ໨ඪୡ੒ʂ 
 Done! νϡʔχϯά 
 Tune your app

w ϦΫΤετϨεϙϯε͸͓ೃછΈͷSFRVFTUTͷ΍ΓํͰͰ͖Δ 3FRVFTUTBOESFTQPOTFTXPSLKVTUMJLFXFMMLOPXOMJCSBSZSFRVFTUT Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM from locust import HttpUser, task class YourUser(HttpUser): @task def get_something(self): with self.client.get("/something") as resp: print(resp.json())

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 $IFDLSFTQPOTFTJOEFUBJMBOENBSLBTTVDDFFEFEGBJMFE Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM class YourUser(HttpUser): @task def get_something(self): self.client.get("/something") User User User Target spawn request response

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() # resp.success() ΋͋Δ 'BTU"1*TBNQMFBQQˣ MPDVTUGJMFˠ

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() # resp.success() ΋͋Δ 'BTU"1*TBNQMFBQQˣ MPDVTUGJMFˠ name, passwordΛड͚औͬͯɺ session id୅ΘΓʹnameͷcookieʹηοτ Receive name and password, set name in cookie as if session id

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() # resp.success() ΋͋Δ MPDVTUGJMFˠ nameͷ஋Λ֬ೝͯ͠ɺϩάΠϯ֬ೝͯ͠Δ෩ Validate the value of “name” in cookie, pretending to checking if a user is authenticated 'BTU"1*TBNQMFBQQˣ

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() # resp.success() ΋͋Δ MPDVTUGJMF UFTUTDFOBSJP ˠ 'BTU"1*TBNQMFBQQˣ ςετ༻Ϣʔβ Users for load testing

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() # resp.success() ΋͋Δ MPDVTUGJMFˠ Ϣʔβ͕εϙʔϯ͢Δͱ͖ʹݺ͹ΕΔ Called when a user is spawned ͜ͷηογϣϯ͸͋ͱͷ@taskͷॲཧʹҾ͖ܧ͕ΕΔ This session is shared to following part decorated with @task 'BTU"1*TBNQMFBQQˣ

Ϩεϙϯεͷৄࡉͳ֬ೝ7BMJEBUFSFTQPOTFTJOEFUBJM @app.post("/auth") def auth(user: User, resp: Response): req_body = user.dict() # {"name": "alice1234", "password": "alice1234"} if user_collection.find_one(req_body): resp.status_code = status.HTTP_200_OK resp.set_cookie(key="name", value=user.name) else: resp.status_code = status.HTTP_403_FORBIDDEN @app.get(“/top") def top(resp: Response, name: Optional[str] = Cookie(None)): if name: return {"name": name} resp.status_code = status.HTTP_403_FORBIDDEN return {"message": "please login via /auth"} USERS = [ {"name": “alice”,”password”:”alice1234”}, {"name": “bob”,”password”:”bob5678”}, ] class AuthenticatedUser(HttpUser): def on_start(self): if len(USERS) > 0: user = USERS.pop() logger.info(f"popped user: {user}") self.name = user["name"] self.client.post( "/auth", json={ "name": user["name"], "password": user["password"], }, ) @task def get_name(self): with self.client.get(“/top") as resp: if resp.json()["name"] != self.name: logger.warning("not match") resp.failure() else: resp.successe() 'BTU"1*ˣ MPDVTUGJMFˠ Ϣʔβݻ༗ͷ৘ใΛΠϯελϯεม਺ͱͯ͠อ࣋ Keep user-specific value as an instance variable Ϣʔβ͝ͱʹҟͳΔظ଴஋Λ൑ఆ Validate if the expected value is returned ࣦഊ or ੒ޭͱͯ͠ه࿥ Mark as failed or succeeded

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 IUUQTEPDTMPDVTUJPFOTUBCMFBQJIUNMFWFOUIPPLT @events.test_start.add_listener def on_test_start(environment, **kwargs): if isinstance(environment.runner, MasterRunner): setup_database() insert_master_data() 
 insert_some_aditional_data() 
 else: # Do worker node setup

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 insert_loadtest_user_data() 
 else: # Do worker node setup @click.command(“setup”) def setup_local_env(): setup_database() insert_master_data()

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 $ locust --worker Target worker 1 worker 2 Master

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apiVersion: batch/v1 kind: Job metadata: name: locust-master labels: app: locust role: master spec: completions: 1 template: metadata: labels: app: locust role: master spec: restartPolicy: OnFailure containers: - name: locust image: tatchnicolas/pyconjp2021-locust command: - "locust" - "--master" - "--config" - "/var/locust/locust.conf" apiVersion: batch/v1 kind: Job metadata: name: locust-worker labels: app: locust role: worker spec: completions: 2 parallelism: 2 template: metadata: labels: app: locust role: worker spec: restartPolicy: OnFailure containers: - name: locust image: tatchnicolas/pyconjp2021-locust command: - "locust" - "--worker" env: - name: LOCUST_MASTER_NODE_HOST value: locust-master-svc Master ↓ Worker→ Ϋϥελߏ੒Ͱͷࢼݧ࣮ߦ%JTUSJCVUFEXPSLFST

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