Datasets:
File size: 8,433 Bytes
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from __future__ import annotations
import copy
import json
import os
from pathlib import Path
from klein_code_bench.catalog import FAMILIES
from klein_code_bench.protocol import TIERS
from klein_code_bench.reference.domains import solve
class Fault(Exception):
pass
def integer(value, minimum=0, maximum=None):
return (
type(value) is int
and value >= minimum
and (maximum is None or value <= maximum)
)
def req_op(request):
return request.get("op") if isinstance(request, dict) else None
class Service:
def __init__(self, family, tier, state_dir=None):
self.family = FAMILIES[family]
self.level = list(TIERS).index(tier)
self.directory = Path(state_dir) if state_dir is not None else None
self.state = {"revision": 0, "docs": {}, "history": [], "tokens": {}}
self.stack = []
if self.directory is not None:
self.directory.mkdir(parents=True, exist_ok=True)
path = self.directory / "workspace.json"
if path.exists():
self.state = json.loads(path.read_text(encoding="utf-8"))
def persist(self):
if self.directory is None or self.stack:
return
path = self.directory / "workspace.json"
temporary = self.directory / "workspace.tmp"
with temporary.open("w", encoding="utf-8") as f:
json.dump(self.state, f, ensure_ascii=True, allow_nan=False)
f.flush()
os.fsync(f.fileno())
os.replace(temporary, path)
if os.name == "posix":
fd = os.open(self.directory, os.O_RDONLY)
try:
os.fsync(fd)
finally:
os.close(fd)
def compute(self, value):
if not isinstance(value, dict) or not all(
k in value for k in self.family.required
):
raise Fault("invalid_input")
return solve(self.family.slug, copy.deepcopy(value))
def request(self, request):
before, stack = copy.deepcopy(self.state), copy.deepcopy(self.stack)
try:
result = self.dispatch(request)
response = {"ok": True, "result": result}
# Writes inside a transaction remain volatile until outermost commit.
if (
self.level == 3
and not self.stack
and (
self.state != before or bool(stack) and req_op(request) == "commit"
)
):
self.persist()
return copy.deepcopy(response)
except Fault as error:
self.state, self.stack = before, stack
return {"ok": False, "error": str(error)}
def dispatch(self, req, inside_batch=False):
if not isinstance(req, dict) or not isinstance(req.get("op"), str):
raise Fault("invalid_request")
op = req["op"]
allowed = {"solve"}
if self.level >= 1:
allowed |= {"put", "get", "delete", "list", "evaluate", "status"}
if self.level >= 2:
allowed |= {"batch", "begin", "commit", "rollback"}
if self.level == 3:
allowed |= {"history", "scan"}
if op not in allowed:
raise Fault("invalid_request")
if inside_batch and op not in {
"solve",
"put",
"get",
"delete",
"list",
"evaluate",
"status",
}:
raise Fault("invalid_request")
token = req.get("token")
if self.level == 3 and "token" in req:
if (
inside_batch
or op not in {"put", "delete", "batch"}
or not isinstance(token, str)
or not token
):
raise Fault("invalid_request")
canonical = json.dumps(
{k: v for k, v in req.items() if k != "token"},
sort_keys=True,
separators=(",", ":"),
)
cached = self.state["tokens"].get(token)
if cached:
if cached["request"] != canonical:
raise Fault("idempotency_conflict")
return copy.deepcopy(cached["result"])
else:
token = None
result = self.execute(op, req)
if token is not None:
self.state["tokens"][token] = {
"request": canonical,
"result": copy.deepcopy(result),
}
return result
def execute(self, op, req):
if op == "solve":
return self.compute(req.get("input"))
docs = self.state["docs"]
if op in {"put", "get", "delete", "evaluate"}:
key = req.get("key")
if (
not isinstance(key, str)
or not key
or op == "put"
and "value" not in req
):
raise Fault("invalid_request")
if self.level >= 2 and op in {"put", "delete"} and "if_revision" in req:
if not integer(req["if_revision"]):
raise Fault("invalid_request")
if req["if_revision"] != self.state["revision"]:
raise Fault("conflict")
if op != "put" and key not in docs:
raise Fault("not_found")
if op == "get":
return copy.deepcopy(docs[key])
if op == "evaluate":
return self.compute(docs[key]["value"])
self.state["revision"] += 1
revision = self.state["revision"]
if op == "put":
docs[key] = {
"key": key,
"value": copy.deepcopy(req["value"]),
"revision": revision,
}
else:
del docs[key]
if self.level == 3:
event = {"revision": revision, "op": op, "key": key}
if op == "put":
event["value"] = copy.deepcopy(req["value"])
self.state["history"].append(event)
return {"key": key, "revision": revision}
if op == "list":
prefix = req.get("prefix", "")
if not isinstance(prefix, str):
raise Fault("invalid_request")
return sorted(k for k in docs if k.startswith(prefix))
if op == "status":
return {"revision": self.state["revision"], "size": len(docs)}
if op == "batch":
commands = req.get("commands")
if not isinstance(commands, list) or len(commands) > 32:
raise Fault("invalid_request")
return [self.dispatch(command, inside_batch=True) for command in commands]
if op == "begin":
if len(self.stack) >= 8:
raise Fault("transaction_limit")
self.stack.append(copy.deepcopy(self.state))
return {"depth": len(self.stack)}
if op in {"commit", "rollback"}:
if not self.stack:
raise Fault("no_transaction")
previous = self.stack.pop()
if op == "rollback":
self.state = previous
return {"depth": len(self.stack)}
if op == "history":
after, limit = req.get("after", 0), req.get("limit", 100)
if not integer(after) or not integer(limit, maximum=100):
raise Fault("invalid_request")
return copy.deepcopy(
[e for e in self.state["history"] if e["revision"] > after][:limit]
)
if op == "scan":
prefix, after, limit = (
req.get("prefix", ""),
req.get("after", ""),
req.get("limit", 100),
)
if (
not isinstance(prefix, str)
or not isinstance(after, str)
or not integer(limit, maximum=100)
):
raise Fault("invalid_request")
keys = sorted(k for k in docs if k.startswith(prefix) and k > after)
chosen = keys[:limit]
return {
"items": [copy.deepcopy(docs[k]) for k in chosen],
"next": chosen[-1] if chosen and len(keys) > len(chosen) else None,
}
raise Fault("invalid_request")
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