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Feature Flag Management System
Enables gradual rollout of features with granular control
"""
import json
import logging
from dataclasses import dataclass, field
from datetime import datetime
from enum import Enum
from pathlib import Path
from typing import Any, Dict, List, Optional, Set
logger = logging.getLogger(__name__)
class FlagType(Enum):
"""Types of feature flags"""
BOOLEAN = "boolean"
PERCENTAGE = "percentage"
ALLOWLIST = "allowlist"
BLOCKLIST = "blocklist"
class FlagStatus(Enum):
"""Feature flag status"""
ENABLED = "enabled"
DISABLED = "disabled"
ROLLING_OUT = "rolling_out"
ROLLING_BACK = "rolling_back"
@dataclass
class FeatureFlag:
"""Feature flag configuration"""
key: str
name: str
description: str
flag_type: str
status: str
value: Any
created_at: str
updated_at: str
created_by: str
tags: List[str] = field(default_factory=list)
metadata: Dict[str, Any] = field(default_factory=dict)
rollout_percentage: Optional[int] = None
allowlist: Set[str] = field(default_factory=set)
blocklist: Set[str] = field(default_factory=set)
expires_at: Optional[str] = None
class FeatureFlagManager:
"""Feature flag management system"""
def __init__(self, config_path: Path = Path("config/feature_flags.json")):
self.config_path = config_path
self.config_path.parent.mkdir(parents=True, exist_ok=True)
self.flags: Dict[str, FeatureFlag] = {}
self.audit_log: List[Dict[str, Any]] = []
self.load_flags()
def load_flags(self):
"""Load feature flags from configuration"""
if not self.config_path.exists():
self._initialize_default_flags()
return
try:
with open(self.config_path, "r") as f:
data = json.load(f)
for key, flag_data in data.get("flags", {}).items():
flag = FeatureFlag(
key=key,
name=flag_data["name"],
description=flag_data["description"],
flag_type=flag_data["flag_type"],
status=flag_data["status"],
value=flag_data["value"],
created_at=flag_data["created_at"],
updated_at=flag_data["updated_at"],
created_by=flag_data.get("created_by", "system"),
tags=flag_data.get("tags", []),
metadata=flag_data.get("metadata", {}),
rollout_percentage=flag_data.get("rollout_percentage"),
allowlist=set(flag_data.get("allowlist", [])),
blocklist=set(flag_data.get("blocklist", [])),
expires_at=flag_data.get("expires_at"),
)
self.flags[key] = flag
logger.info(f"Loaded {len(self.flags)} feature flags")
except Exception as e:
logger.error(f"Error loading feature flags: {e}")
self._initialize_default_flags()
def _initialize_default_flags(self):
"""Initialize with default feature flags"""
default_flags = {
"new_dashboard_ui": FeatureFlag(
key="new_dashboard_ui",
name="New Dashboard UI",
description="Enable redesigned dashboard interface",
flag_type=FlagType.BOOLEAN.value,
status=FlagStatus.DISABLED.value,
value=False,
created_at=datetime.now().isoformat(),
updated_at=datetime.now().isoformat(),
created_by="system",
tags=["ui", "dashboard"],
),
"advanced_ai_analysis": FeatureFlag(
key="advanced_ai_analysis",
name="Advanced AI Analysis",
description="Enable advanced AI-powered analysis features",
flag_type=FlagType.PERCENTAGE.value,
status=FlagStatus.ROLLING_OUT.value,
value=True,
created_at=datetime.now().isoformat(),
updated_at=datetime.now().isoformat(),
created_by="system",
tags=["ai", "analysis"],
rollout_percentage=20,
),
"simplified_workflow": FeatureFlag(
key="simplified_workflow",
name="Simplified Workflow",
description="Simplified investigation workflow for new users",
flag_type=FlagType.BOOLEAN.value,
status=FlagStatus.ENABLED.value,
value=True,
created_at=datetime.now().isoformat(),
updated_at=datetime.now().isoformat(),
created_by="system",
tags=["workflow", "ux"],
),
"beta_reporting": FeatureFlag(
key="beta_reporting",
name="Beta Reporting",
description="Enable new reporting features in beta",
flag_type=FlagType.ALLOWLIST.value,
status=FlagStatus.ROLLING_OUT.value,
value=True,
created_at=datetime.now().isoformat(),
updated_at=datetime.now().isoformat(),
created_by="system",
tags=["reporting", "beta"],
allowlist={"admin@company.com", "beta-testers@company.com"},
),
}
self.flags = default_flags
self.save_flags()
def save_flags(self):
"""Save feature flags to configuration"""
data = {
"version": "1.0",
"last_updated": datetime.now().isoformat(),
"flags": {},
}
for key, flag in self.flags.items():
data["flags"][key] = {
"name": flag.name,
"description": flag.description,
"flag_type": flag.flag_type,
"status": flag.status,
"value": flag.value,
"created_at": flag.created_at,
"updated_at": flag.updated_at,
"created_by": flag.created_by,
"tags": flag.tags,
"metadata": flag.metadata,
"rollout_percentage": flag.rollout_percentage,
"allowlist": list(flag.allowlist),
"blocklist": list(flag.blocklist),
"expires_at": flag.expires_at,
}
with open(self.config_path, "w") as f:
json.dump(data, f, indent=2)
logger.info(f"Saved {len(self.flags)} feature flags")
def is_enabled(self, key: str, user_id: Optional[str] = None, context: Optional[Dict[str, Any]] = None) -> bool:
"""Check if feature flag is enabled for given user/context"""
if key not in self.flags:
logger.warning(f"Unknown feature flag: {key}")
return False
flag = self.flags[key]
if flag.status == FlagStatus.DISABLED.value:
return False
if flag.expires_at:
expires = datetime.fromisoformat(flag.expires_at)
if datetime.now() > expires:
logger.warning(f"Feature flag {key} has expired")
return False
if flag.flag_type == FlagType.BOOLEAN.value:
return flag.value
elif flag.flag_type == FlagType.PERCENTAGE.value:
if not flag.rollout_percentage or flag.rollout_percentage >= 100:
return True
if user_id and context:
hash_value = hash(f"{key}_{user_id}_{context.get('tenant_id', '')}")
rollout = hash_value % 100
return rollout < flag.rollout_percentage
return flag.rollout_percentage > 0
elif flag.flag_type == FlagType.ALLOWLIST.value:
if user_id:
return user_id in flag.allowlist
return False
elif flag.flag_type == FlagType.BLOCKLIST.value:
if user_id:
return user_id not in flag.blocklist
return True
return flag.value
def create_flag(
self,
key: str,
name: str,
description: str,
flag_type: str,
value: Any = False,
created_by: str = "system",
tags: Optional[List[str]] = None,
metadata: Optional[Dict[str, Any]] = None,
) -> bool:
"""Create new feature flag"""
if key in self.flags:
logger.error(f"Feature flag {key} already exists")
return False
flag = FeatureFlag(
key=key,
name=name,
description=description,
flag_type=flag_type,
status=FlagStatus.ENABLED.value if value else FlagStatus.DISABLED.value,
value=value,
created_at=datetime.now().isoformat(),
updated_at=datetime.now().isoformat(),
created_by=created_by,
tags=tags or [],
metadata=metadata or {},
)
self.flags[key] = flag
self.save_flags()
self._log_audit("CREATE", key, created_by, {"name": name, "value": value})
logger.info(f"Created feature flag: {key}")
return True
def update_flag(
self,
key: str,
value: Optional[Any] = None,
status: Optional[str] = None,
rollout_percentage: Optional[int] = None,
allowlist: Optional[Set[str]] = None,
blocklist: Optional[Set[str]] = None,
updated_by: str = "system",
) -> bool:
"""Update existing feature flag"""
if key not in self.flags:
logger.error(f"Feature flag {key} does not exist")
return False
flag = self.flags[key]
changes = {}
if value is not None:
changes["value"] = {"old": flag.value, "new": value}
flag.value = value
if status is not None:
changes["status"] = {"old": flag.status, "new": status}
flag.status = status
if rollout_percentage is not None:
changes["rollout_percentage"] = {"old": flag.rollout_percentage, "new": rollout_percentage}
flag.rollout_percentage = rollout_percentage
if allowlist is not None:
changes["allowlist"] = {"old": list(flag.allowlist), "new": list(allowlist)}
flag.allowlist = allowlist
if blocklist is not None:
changes["blocklist"] = {"old": list(flag.blocklist), "new": list(blocklist)}
flag.blocklist = blocklist
flag.updated_at = datetime.now().isoformat()
self.save_flags()
self._log_audit("UPDATE", key, updated_by, changes)
logger.info(f"Updated feature flag: {key}")
return True
def delete_flag(self, key: str, deleted_by: str = "system") -> bool:
"""Delete feature flag"""
if key not in self.flags:
logger.error(f"Feature flag {key} does not exist")
return False
flag = self.flags[key]
del self.flags[key]
self.save_flags()
self._log_audit("DELETE", key, deleted_by, {"flag_data": flag.name})
logger.info(f"Deleted feature flag: {key}")
return True
def _log_audit(self, action: str, key: str, actor: str, details: Dict[str, Any]):
"""Log audit entry"""
entry = {
"timestamp": datetime.now().isoformat(),
"action": action,
"flag_key": key,
"actor": actor,
"details": details,
}
self.audit_log.append(entry)
audit_path = self.config_path.parent / "feature_flag_audit.json"
with open(audit_path, "w") as f:
json.dump(self.audit_log[-100:], f, indent=2)
def get_flags_by_tag(self, tag: str) -> List[FeatureFlag]:
"""Get all flags with specific tag"""
return [flag for flag in self.flags.values() if tag in flag.tags]
def get_expired_flags(self) -> List[FeatureFlag]:
"""Get all expired flags"""
expired = []
now = datetime.now()
for flag in self.flags.values():
if flag.expires_at:
expires = datetime.fromisoformat(flag.expires_at)
if now > expires:
expired.append(flag)
return expired
def generate_report(self) -> Dict[str, Any]:
"""Generate feature flag report"""
report = {
"generated_at": datetime.now().isoformat(),
"summary": {
"total_flags": len(self.flags),
"enabled_flags": sum(1 for f in self.flags.values() if f.status == FlagStatus.ENABLED.value),
"disabled_flags": sum(1 for f in self.flags.values() if f.status == FlagStatus.DISABLED.value),
"rolling_out_flags": sum(1 for f in self.flags.values() if f.status == FlagStatus.ROLLING_OUT.value),
"rolling_back_flags": sum(1 for f in self.flags.values() if f.status == FlagStatus.ROLLING_BACK.value),
"expired_flags": len(self.get_expired_flags()),
},
"flags": {},
"tags": {},
}
for key, flag in self.flags.items():
report["flags"][key] = {
"name": flag.name,
"status": flag.status,
"type": flag.flag_type,
"value": flag.value,
"rollout_percentage": flag.rollout_percentage,
"tags": flag.tags,
}
for tag in flag.tags:
if tag not in report["tags"]:
report["tags"][tag] = 0
report["tags"][tag] += 1
return report
# Global instance
feature_flags = FeatureFlagManager()
def is_enabled(key: str, user_id: Optional[str] = None, context: Optional[Dict[str, Any]] = None) -> bool:
"""Convenience function to check if feature flag is enabled"""
return feature_flags.is_enabled(key, user_id, context)
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