| 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) |
|
|
