77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
# engine/identity.py
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"""Node identity from host FQDN + node.env (replaces bash root_require_node).
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Decision B: the FQDN <node>.a<x>.apex.ermnvldmr.com keeps the cluster; we parse
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node+cluster from it. node.env owns APEX_SUBNET and mirrors APEX_CLUSTER; hostname
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wins on drift. Falls back to the repo directory name when the FQDN is not yet
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apex-shaped (mid-cutover).
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"""
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from __future__ import annotations
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import os
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import re
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import sys
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from dataclasses import dataclass
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from typing import Dict, List, Tuple
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_FQDN = re.compile(r"^(?P<node>[^.]+)\.(?P<cluster>a\d+)\.apex\.ermnvldmr\.com$")
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_DIRNAME = re.compile(r"^(?P<node>[^.]+)\.apex\.ermnvldmr\.com")
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@dataclass
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class Node:
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name: str
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cluster: str
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subnet: str
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fqdn: str
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def read_env(path: str) -> Dict[str, str]:
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"""Parse a KEY=value file (shell-sourceable). Ignores comments/blank lines."""
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out: Dict[str, str] = {}
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if not os.path.isfile(path):
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return out
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with open(path) as f:
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for line in f:
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line = line.strip()
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if not line or line.startswith("#") or "=" not in line:
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continue
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key, _, val = line.partition("=")
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out[key.strip()] = val.strip().strip('"').strip("'")
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return out
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def resolve(fqdn: str, repo_root: str) -> Tuple[Node, List[str]]:
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"""Return (Node, warnings). Exits 66 (EX_NOINPUT) if APEX_SUBNET is missing."""
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warns: List[str] = []
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env = read_env(os.path.join(repo_root, "node.env"))
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m = _FQDN.match(fqdn or "")
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if m:
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name, cluster = m.group("node"), m.group("cluster")
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env_cluster = env.get("APEX_CLUSTER")
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if env_cluster and env_cluster != cluster:
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warns.append(
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f"cluster drift: hostname says {cluster!r}, node.env says "
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f"{env_cluster!r}; hostname wins."
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)
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else:
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# Fallback: derive node from repo dir name; cluster from node.env.
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warns.append(
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f"FQDN {fqdn!r} is not apex-shaped; falling back to repo dir + node.env."
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)
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base = os.path.basename(os.path.realpath(repo_root))
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dm = _DIRNAME.match(base)
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name = dm.group("node") if dm else base
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cluster = env.get("APEX_CLUSTER", "")
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if not cluster:
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sys.stderr.write("identity: no cluster in FQDN or node.env\n")
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raise SystemExit(66)
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subnet = env.get("APEX_SUBNET", "")
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if not subnet:
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sys.stderr.write("identity: APEX_SUBNET missing from node.env\n")
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raise SystemExit(66)
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return Node(name=name, cluster=cluster, subnet=subnet, fqdn=fqdn), warns
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