File size: 1,285 Bytes
ce33d98 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | import hashlib, json, time, os, requests
from pathlib import Path
API="https://api.materialsproject.org"
class Rest:
def __init__(self, cache, env="/home/kna/WyckoffTransformer/.env"):
key=None
for line in Path(env).read_text().splitlines():
if line.startswith("MP_API_KEY="): key=line.split("=",1)[1].strip().strip("'\"")
self.s=requests.Session(); self.s.headers["X-API-KEY"]=key
self.cache=Path(cache); self.cache.mkdir(parents=True, exist_ok=True)
def get(self, endpoint, params, use_cache=True):
tag=hashlib.sha1(json.dumps([endpoint,params],sort_keys=True).encode()).hexdigest()
p=self.cache/f"{tag}.json"
if use_cache and p.exists(): return json.loads(p.read_text())
for a in range(8):
try:
r=self.s.get(API+endpoint, params=params, timeout=600)
except requests.RequestException as e:
time.sleep(2**a); continue
if r.status_code==429 or r.status_code>=500: time.sleep(2**a); continue
if r.status_code>=400: raise RuntimeError(f"{r.status_code} {r.text[:500]}")
d=r.json(); tmp=p.with_suffix(".tmp"); tmp.write_text(json.dumps(d)); tmp.rename(p); return d
raise RuntimeError("failed "+endpoint)
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