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refactor: Improve code quality, error handling, and test coverage

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- Add file_lock context manager to eliminate duplicate locking patterns
- Add ValidationError, ConfigurationError, CertificateError exceptions
- Improve rollback logic in haproxy_add_servers (track successful ops only)
- Decompose haproxy_add_domain into smaller helper functions
- Consolidate certificate constants (CERTS_DIR, ACME_HOME) to config.py
- Enhance docstrings for internal functions and magic numbers
- Add pytest framework with 48 new tests (269 -> 317 total)
- Increase test coverage from 76% to 86%
  - servers.py: 58% -> 82%
  - certificates.py: 67% -> 86%
  - configuration.py: 69% -> 94%

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
kaffa
2026-02-03 12:50:00 +09:00
parent 18ce812920
commit 6bcfee519c
25 changed files with 6852 additions and 125 deletions
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132
haproxy_mcp/tools/domains.py
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@@ -3,7 +3,7 @@
import fcntl
import os
import subprocess
from typing import Annotated
from typing import Annotated, Optional
from pydantic import Field
@@ -16,6 +16,7 @@ from ..config import (
StateField,
STATE_MIN_COLUMNS,
SUBPROCESS_TIMEOUT,
CERTS_DIR,
logger,
)
from ..exceptions import HaproxyError
@@ -31,8 +32,85 @@ from ..file_ops import (
remove_domain_from_config,
)
# Certificate paths
CERTS_DIR = "/opt/haproxy/certs"
def _find_available_pool(entries: list[tuple[str, str]], used_pools: set[str]) -> Optional[str]:
"""Find an available pool backend from the pool list.
Iterates through pool_1 to pool_N and returns the first pool
that is not currently in use.
Args:
entries: List of (domain, backend) tuples from the map file.
used_pools: Set of pool names already in use.
Returns:
Available pool name (e.g., "pool_5") or None if all pools are in use.
"""
for i in range(1, POOL_COUNT + 1):
pool_name = f"pool_{i}"
if pool_name not in used_pools:
return pool_name
return None
def _check_subdomain(domain: str, registered_domains: set[str]) -> tuple[bool, Optional[str]]:
"""Check if a domain is a subdomain of an existing registered domain.
For example, vault.anvil.it.com is a subdomain if anvil.it.com exists.
Subdomains should not have wildcard entries added to avoid conflicts.
Args:
domain: Domain name to check (e.g., "api.example.com").
registered_domains: Set of already registered domain names.
Returns:
Tuple of (is_subdomain, parent_domain or None).
"""
parts = domain.split(".")
for i in range(1, len(parts)):
candidate = ".".join(parts[i:])
if candidate in registered_domains:
return True, candidate
return False, None
def _update_haproxy_maps(domain: str, pool: str, is_subdomain: bool) -> None:
"""Update HAProxy maps via Runtime API.
Uses 2-stage matching: exact domains go to domains.map,
wildcards go to wildcards.map.
Args:
domain: Domain name to add.
pool: Pool backend name (e.g., "pool_5").
is_subdomain: If True, skip adding wildcard entry.
Raises:
HaproxyError: If HAProxy Runtime API command fails.
"""
haproxy_cmd(f"add map {MAP_FILE_CONTAINER} {domain} {pool}")
if not is_subdomain:
haproxy_cmd(f"add map {WILDCARDS_MAP_FILE_CONTAINER} .{domain} {pool}")
def _rollback_domain_addition(
domain: str,
entries: list[tuple[str, str]]
) -> None:
"""Rollback a failed domain addition by removing entries from map file.
Called when HAProxy Runtime API update fails after the map file
has already been saved.
Args:
domain: Domain name that was added.
entries: Current list of map entries to rollback from.
"""
rollback_entries = [(d, b) for d, b in entries if d != domain and d != f".{domain}"]
try:
save_map_file(rollback_entries)
except IOError:
logger.error("Failed to rollback map file after HAProxy error")
def check_certificate_coverage(domain: str) -> tuple[bool, str]:
@@ -158,41 +236,26 @@ def register_domain_tools(mcp):
if domain_entry == domain:
return f"Error: Domain {domain} already exists (mapped to {backend})"
# Find available pool (using cached entries)
# Build used pools and registered domains sets
used_pools: set[str] = set()
registered_domains: set[str] = set()
for entry_domain, backend in entries:
if backend.startswith("pool_"):
used_pools.add(backend)
# Collect non-wildcard domains for subdomain check
if not entry_domain.startswith("."):
registered_domains.add(entry_domain)
pool = None
for i in range(1, POOL_COUNT + 1):
pool_name = f"pool_{i}"
if pool_name not in used_pools:
pool = pool_name
break
# Find available pool
pool = _find_available_pool(entries, used_pools)
if not pool:
return f"Error: All {POOL_COUNT} pool backends are in use"
# Check if this is a subdomain of an existing domain
# e.g., vault.anvil.it.com is subdomain if anvil.it.com exists
is_subdomain = False
parent_domain = None
parts = domain.split(".")
for i in range(1, len(parts)):
candidate = ".".join(parts[i:])
if candidate in registered_domains:
is_subdomain = True
parent_domain = candidate
break
is_subdomain, parent_domain = _check_subdomain(domain, registered_domains)
try:
# Save to disk first (atomic write for persistence)
entries.append((domain, pool))
# Only add wildcard for root domains, not subdomains
if not is_subdomain:
entries.append((f".{domain}", pool))
try:
@@ -200,42 +263,29 @@ def register_domain_tools(mcp):
except IOError as e:
return f"Error: Failed to save map file: {e}"
# Then update HAProxy maps via Runtime API
# 2-stage matching: exact domains go to domains.map, wildcards go to wildcards.map
# Update HAProxy maps via Runtime API
try:
haproxy_cmd(f"add map {MAP_FILE_CONTAINER} {domain} {pool}")
if not is_subdomain:
haproxy_cmd(f"add map {WILDCARDS_MAP_FILE_CONTAINER} .{domain} {pool}")
_update_haproxy_maps(domain, pool, is_subdomain)
except HaproxyError as e:
# Rollback: remove the domain we just added from entries and re-save
rollback_entries = [(d, b) for d, b in entries if d != domain and d != f".{domain}"]
try:
save_map_file(rollback_entries)
except IOError:
logger.error("Failed to rollback map file after HAProxy error")
_rollback_domain_addition(domain, entries)
return f"Error: Failed to update HAProxy map: {e}"
# If IP provided, add server to slot 1
if ip:
# Save server config to disk first
add_server_to_config(domain, 1, ip, http_port)
try:
server = f"{pool}_1"
haproxy_cmd(f"set server {pool}/{server} addr {ip} port {http_port}")
haproxy_cmd(f"set server {pool}/{server} state ready")
except HaproxyError as e:
# Rollback server config on failure
remove_server_from_config(domain, 1)
return f"Domain {domain} added to {pool} but server config failed: {e}"
result = f"Domain {domain} added to {pool} with server {ip}:{http_port}"
if is_subdomain:
result += f" (subdomain of {parent_domain}, no wildcard)"
else:
result = f"Domain {domain} added to {pool} (no servers configured)"
if is_subdomain:
result += f" (subdomain of {parent_domain}, no wildcard)"
if is_subdomain:
result += f" (subdomain of {parent_domain}, no wildcard)"
# Check certificate coverage
cert_covered, cert_info = check_certificate_coverage(domain)