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FastAPI を活用した オープンデータAPI の作成
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Yuuki Shimizu
September 11, 2021
Programming
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FastAPI を活用した オープンデータAPI の作成
2021.9.11
Python Charity Talks in Japan 2021.09
Yuuki Shimizu
September 11, 2021
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Transcript
2021. 9. 11 ͠Έͣ Ώ͏͖ 1 ʲPython Charity Talks in
Japan 2021.09ʳ FastAPI Λ׆༻ͨ͠ ΦʔϓϯσʔλAPI ͷ࡞
͓·͑୭Αʁ ͠Έͣ Ώ͏͖ • ϞόΠϧΞϓϦ ΤϯδχΞ ◦ Android/iOS • ࢁསݝߕࢢ
ग़ • Python Shingen.py Ͱ৮ΕΔ͘Β͍ 2
sli.do Ͱ࣭Λड͚͚͍ͯ·͢ʂ 3
͡Ίʹ • ݱࡏɺࢁསݝͷΦʔϓϯσʔλαΠτͰ 12,000݅Λ͑Δσʔλ͕ެ։͞Ε͍ͯΔ • ϞόΠϧΞϓϦͰར༻͍ͨ͠߹ɺWeb API Ͱఏڙ͞Ε͍ͯΔͱखܰʹࢼ͢͜ͱ͕Ͱ͖ͯ خ͍͠ •
Shingen.py ͷษڧձͰ FastAPI Λࢼ͢ػձ͕ ͋ΓɺΦʔϓϯσʔλར༻ʹ׆༻Ͱ͖ͳ͍͔ ݕ౼ͨ͠ 4
FastAPI ͱ • OpenAPI ʹج͍ͮͯ࡞ΒΕ͍ͯ Δ Python ϑϨʔϜϫʔΫ • ࡞Γ͢͞Λҙࣝ
• ʮૣ͍ɾ͍ɾ؆୯ʯ ◦ ։ൃ͕ૣ͍ ◦ ͦΕͳΓʹύϑΥʔϚϯε͕ग़Δ ʢ͍ʣ ◦ ؆୯ʹ࡞ΕΔ 5 from typing import Optional from fastapi import FastAPI app = FastAPI() @app.get("/") def read_root(): return {"Hello": "World"} @app.get("/items/{item_id}") def read_item(item_id: int, q: Optional[str] = None): return return {"item_id": item_id, "q": q}
ྫͱͯ͠ɺ ࢁསͷԹઘࢪઃΛฦ٫͢ΔAPI Λ FastAPI Ͱ࡞͢Δ 6 ͪͳΈʹ ࢁས ઘ࣭͕ଟ༷ɺܠ؍ͷྑ͍Թઘ͕ͱͯଟ͍Ͱ͢ʂ
ݝͷΦʔϓϯσʔλΛར༻ 7
8 PDF !!
PDF Ͱେৎʂ PDF Λͦͷ··ϩʔυͯ͠มޙɺ FastAPI Ͱฦ٫͢ΔΑ͏࣮͠·ͨ͠ 9 Python ศརͰ͢Ͷ
chezou/tabula-py • PDF ϑΝΠϧͷදΛ pandas ͷ DataFrame ΦϒδΣΫτʹ ม͢ΔϥΠϒϥϦ ◦
CSVɺTSVɺJSON ϑΝΠϧʹม ͢Δ͜ͱՄೳ • OCR πʔϧͰͳ͍ • Java 8 Ҏ͕߱ඞཁ 10
main.py - ᶃ PDF ಡΈࠐΈ def check_columns(df, previous_df): difference1 =
set(df.keys()) - set(previous_df.keys()) difference2 = set(previous_df.keys()) - set(df.keys()) return (len(difference1) == 0 and len(difference2) == 0) 11 def get_data(pdf_path): previous_df = pd.DataFrame() dfs = tabula.read_pdf(pdf_path, lattice=True, pages = 'all') for df in dfs: # ෳϖʔδͷදΛ݁߹͢Δ if (check_columns(df, previous_df)): df = pd.concat([previous_df, df]) previous_df = df return previous_df PDFΛಡΈࠐΈɺDataFrame Φϒ δΣΫτΛฦ٫͢Δ ෳϖʔδʹ·͕ͨΔදͷ໊߲ Λൺֱ͠ɺಉ͡ද͔Ͳ͏͔Λఆ ͢Δʢ্ͷ͔ؔΒݺΕΔʣ
main.py - ᶄ API ࡞ 12 app = FastAPI() pdf_path
= "h3012011.pdf" @app.get("/") def read_root(): data = get_data(pdf_path) json_data = data.to_json(orient = 'records') return json.loads(json_data) @app.get("/area/{area}") def read_item(area: str): data = get_data(pdf_path) df_mask = data['ࢢொଜ໊'] == area data = data[df_mask] json_data = data.to_json(orient = 'records') return json.loads(json_data) [get] / શ݅ฦ٫͢Δ API [get] /area/{area} ࢦఆ͞ΕͨࢢொଜͷΈฦ٫͢Δ API
Docker Λ༻ 13 VPS Nginx (ϦόʔεϓϩΩγ) opendata.yamanashi.dev /api/onsen Docker コンテナ
FastAPI localhost:xxxxx main.py ࢁསݝ WebαΠτ CSV PDF tiangolo/uvicorn-gunicorn-fastapi :python3.8-alpine3.10 ্هͷΠϝʔδΛϕʔεʹ openjdk11 ΛΠϯετʔϧ ͨ͠ͷΛ༻
DEMO 14 https://opendata.yamanashi.dev/api/onsen
ࢁསݝΦʔϓϯσʔλAPIϓϩδΣΫτ • ϓϩδΣΫτ αΠτ ◦ ݝͷΦʔϓϯσʔλαΠτͰެ։ ͞Ε͍ͯΔσʔλΛ API Ͱఏڙ •
GitHub ◦ ιʔείʔυΛެ։ ◦ ߋ৽͢Δ͜ͱͰࣗಈσϓϩΠ • DockerHub ◦ FastAPIɺTabula ͕࣮ߦՄೳͳ Docker ΠϝʔδΛఏڙ 15 https://opendata.yamanashi.dev
ຊϓϩδΣΫτ͕ࢦ͢ͱ͜Ζ 16 • ଞͷΦʔϓϯσʔλͷAPIల։Λ༰қʹ͢Δ ◦ ϦϙδτϦΛෳ͠ɺmain.py ΛΧελϚΠζ͢Ε OK • ΦʔϓϯσʔλAPIαʔόͷى্ͪ͛Λ༰қʹ͢Δ
◦ Docker ڥ͕͋ΕϫϯϥΠφʔͰى্ͪ͛Մೳ σʔλར༻ʹ͍ͭͯ ࢁསݝΦʔϓϯσʔλαΠτར༻ن ʹै͏ඞཁ͕͋Γ·͢
͍͞͝ʹ 17
·ͱΊ 18 ʮFastAPI Λ׆༻ͨ͠ ΦʔϓϯσʔλAPI ͷ࡞ʯ • FastAPI Φʔϓϯσʔλ͔Βखܰʹ API
Λ࡞͢Δͷʹ͍͍ͯΔ ◦ Tabula ͱΈ߹ΘͤΔ͜ͱͰɺPDF ϑΝΠϧ FastAPI ʹࡌͤΔ͜ͱ͕ Մೳ • ࢁསݝΦʔϓϯσʔλAPI ϓϩδΣΫτΛى্ͪ͛ ◦ API࡞ɾAPIαʔόى্ͪ͛Λ༰қʹ͠ɺΦʔϓϯσʔλͷར༻ଅਐʹ ܨ͍͛ͨ