kuma-strapper/backend/services/monitors.py

from dataclasses import dataclass
from typing import Optional
import logging

from services.kuma_client import get_kuma_client, Monitor
from services.claude_agent import MonitorSuggestion
from services.ssh_manager import get_ssh_manager
from services import push_scripts

logger = logging.getLogger(__name__)


@dataclass
class DefaultMonitorProfile:
    """A default monitoring profile that doesn't require approval."""

    name: str
    description: str
    monitors: list[Monitor]


def create_host_health_monitors(hostname: str, ssh_port: int = 22) -> list[Monitor]:
    """Create default host health monitors."""
    return [
        Monitor(
            type="ping",
            name=f"{hostname} - Ping",
            hostname=hostname,
            interval=60,
        ),
        Monitor(
            type="tcp",
            name=f"{hostname} - SSH",
            hostname=hostname,
            port=ssh_port,
            interval=120,
        ),
    ]


def create_web_server_monitors(hostname: str, port: int = 80, https: bool = False) -> list[Monitor]:
    """Create monitors for a detected web server."""
    protocol = "https" if https else "http"
    return [
        Monitor(
            type="http",
            name=f"{hostname} - Web ({port})",
            url=f"{protocol}://{hostname}:{port}/",
            interval=60,
        ),
    ]


def create_docker_container_monitors(hostname: str, containers: list[dict]) -> list[Monitor]:
    """Create monitors for detected Docker containers."""
    monitors = []
    for container in containers:
        name = container.get("name", container.get("id", "unknown"))
        monitors.append(
            Monitor(
                type="docker",
                name=f"{hostname} - Container: {name}",
                docker_container=name,
                docker_host=hostname,
                interval=60,
            )
        )
    return monitors


class MonitorService:
    """Service for managing monitors in Uptime Kuma."""

    def __init__(self):
        self.created_monitors: list[dict] = []

    def create_default_monitors(
        self,
        hostname: str,
        ssh_port: int = 22,
        has_docker: bool = False,
        containers: Optional[list[dict]] = None,
        web_ports: Optional[list[int]] = None,
    ) -> list[dict]:
        """
        Create default monitors for a host.
        These are built-in and never require approval.
        """
        kuma = get_kuma_client()
        created = []

        # Host health monitors
        health_monitors = create_host_health_monitors(hostname, ssh_port)
        for monitor in health_monitors:
            try:
                result = kuma.create_monitor(monitor)
                created.append({
                    "monitor": monitor.name,
                    "type": monitor.type,
                    "status": "created",
                    "result": result,
                })
            except Exception as e:
                created.append({
                    "monitor": monitor.name,
                    "type": monitor.type,
                    "status": "failed",
                    "error": str(e),
                })

        # Web server monitors
        if web_ports:
            for port in web_ports:
                https = port == 443 or port == 8443
                web_monitors = create_web_server_monitors(hostname, port, https)
                for monitor in web_monitors:
                    try:
                        result = kuma.create_monitor(monitor)
                        created.append({
                            "monitor": monitor.name,
                            "type": monitor.type,
                            "status": "created",
                            "result": result,
                        })
                    except Exception as e:
                        created.append({
                            "monitor": monitor.name,
                            "type": monitor.type,
                            "status": "failed",
                            "error": str(e),
                        })

        # Docker container monitors
        if has_docker and containers:
            docker_monitors = create_docker_container_monitors(hostname, containers)
            for monitor in docker_monitors:
                try:
                    result = kuma.create_monitor(monitor)
                    created.append({
                        "monitor": monitor.name,
                        "type": monitor.type,
                        "status": "created",
                        "result": result,
                    })
                except Exception as e:
                    created.append({
                        "monitor": monitor.name,
                        "type": monitor.type,
                        "status": "failed",
                        "error": str(e),
                    })

        self.created_monitors.extend(created)
        return created

    def create_from_suggestion(
        self,
        suggestion: MonitorSuggestion,
        hostname: str,
        username: str = "root",
        port: int = 22,
    ) -> dict:
        """
        Create a monitor from a Claude suggestion.
        In production mode, this executes automatically.
        In dev mode, this should only be called after approval.
        """
        kuma = get_kuma_client()

        interval_minutes = max(1, suggestion.interval // 60)
        logger.info(
            f"Creating monitor '{suggestion.name}': type={suggestion.type}, "
            f"interval={suggestion.interval}s ({interval_minutes}min)"
        )

        # Build monitor from suggestion
        monitor = Monitor(
            type=suggestion.type,
            name=suggestion.name,
            interval=suggestion.interval,
        )

        # Set type-specific fields
        if suggestion.type == "http" or suggestion.type == "keyword":
            monitor.url = suggestion.target
            if suggestion.keyword:
                monitor.keyword = suggestion.keyword
        elif suggestion.type == "tcp":
            monitor.hostname = suggestion.target
            monitor.port = suggestion.port
        elif suggestion.type == "ping":
            monitor.hostname = suggestion.target
        elif suggestion.type == "docker":
            monitor.docker_container = suggestion.target
            monitor.docker_host = hostname
        elif suggestion.type == "push":
            # Push monitors need the push_metric field
            pass

        try:
            result = kuma.create_monitor(monitor)
            response = {
                "monitor": monitor.name,
                "type": monitor.type,
                "status": "created",
                "result": result,
                "reason": suggestion.reason,
                "push_metric": suggestion.push_metric,
            }

            # For push monitors, deploy the script to the remote host
            if suggestion.type == "push" and suggestion.push_metric:
                push_token = result.get("pushToken")
                monitor_id = result.get("monitorID")

                if push_token and monitor_id:
                    deploy_result = self.deploy_push_script(
                        hostname=hostname,
                        push_metric=suggestion.push_metric,
                        push_token=push_token,
                        monitor_id=monitor_id,
                        interval_minutes=max(1, suggestion.interval // 60),
                        username=username,
                        port=port,
                    )
                    response["deployment"] = deploy_result
                else:
                    response["deployment"] = {
                        "status": "failed",
                        "error": "No push token returned from Uptime Kuma",
                    }

            return response
        except Exception as e:
            return {
                "monitor": monitor.name,
                "type": monitor.type,
                "status": "failed",
                "error": str(e),
                "reason": suggestion.reason,
            }

    def deploy_push_script(
        self,
        hostname: str,
        push_metric: str,
        push_token: str,
        monitor_id: int,
        interval_minutes: int = 5,
        username: str = "root",
        port: int = 22,
    ) -> dict:
        """
        Deploy a push monitoring script to a remote host via SSH.

        Args:
            hostname: The remote host to deploy to
            push_metric: The metric type (heartbeat, disk, memory, cpu, updates)
            push_token: The Uptime Kuma push token
            monitor_id: The Uptime Kuma monitor ID
            interval_minutes: Cronjob interval in minutes
            username: SSH username
            port: SSH port

        Returns:
            Dict with status and any error messages
        """
        logger.info(
            f"Deploying push script: metric={push_metric}, monitor_id={monitor_id}, "
            f"interval_minutes={interval_minutes}"
        )

        kuma = get_kuma_client()
        ssh = get_ssh_manager()

        # Build the push URL and script
        push_url = kuma.get_push_url(push_token)
        script_content = push_scripts.generate_script(push_metric, push_url)

        if not script_content:
            return {
                "status": "failed",
                "error": f"Unknown push metric type: {push_metric}",
            }

        script_path = push_scripts.get_script_path(push_metric, monitor_id)
        script_filename = push_scripts.get_script_filename(push_metric, monitor_id)
        cronjob_entry = push_scripts.get_cronjob_entry(push_metric, monitor_id, interval_minutes)

        try:
            # Ensure SSH connection
            if not ssh.is_connected(hostname, username, port):
                connected = ssh.connect(hostname, username, port)
                if not connected:
                    return {
                        "status": "failed",
                        "error": f"Could not connect to {hostname}",
                    }

            # Write the script to the remote host using sudo tee (works for non-root users)
            # Using tee instead of redirect because sudo doesn't apply to redirects
            write_cmd = f"sudo tee {script_path} > /dev/null << 'KUMA_SCRIPT_EOF'\n{script_content}KUMA_SCRIPT_EOF"
            result = ssh.execute(hostname, write_cmd, username, port)
            if not result.success:
                error_detail = result.stderr or result.stdout or f"exit code {result.exit_code}"
                return {
                    "status": "failed",
                    "error": f"Failed to write script: {error_detail}",
                }

            # Make the script executable
            chmod_result = ssh.execute(hostname, f"sudo chmod +x {script_path}", username, port)
            if not chmod_result.success:
                error_detail = chmod_result.stderr or chmod_result.stdout or f"exit code {chmod_result.exit_code}"
                return {
                    "status": "failed",
                    "error": f"Failed to make script executable: {error_detail}",
                }

            # Try to add cronjob entry (crontab may not be available on all systems)
            cron_cmd = f"(crontab -l 2>/dev/null | grep -v '{script_filename}'; echo '{cronjob_entry}') | crontab -"
            cron_result = ssh.execute(hostname, cron_cmd, username, port)

            scheduling_method = None
            scheduling_info = None

            if cron_result.success:
                scheduling_method = "crontab"
                scheduling_info = cronjob_entry
            else:
                # Try systemd timer as fallback
                timer_name = f"kuma-push-{push_metric}-{monitor_id}"
                timer_content = f"""[Unit]
Description=Kuma Push Monitor - {push_metric}

[Timer]
OnBootSec=1min
OnUnitActiveSec={interval_minutes}min
AccuracySec=1s

[Install]
WantedBy=timers.target
"""
                service_content = f"""[Unit]
Description=Kuma Push Monitor - {push_metric}

[Service]
Type=oneshot
ExecStart={script_path}
"""
                # Write timer and service files
                timer_path = f"/etc/systemd/system/{timer_name}.timer"
                service_path = f"/etc/systemd/system/{timer_name}.service"

                timer_cmd = f"sudo tee {timer_path} > /dev/null << 'KUMA_TIMER_EOF'\n{timer_content}KUMA_TIMER_EOF"
                service_cmd = f"sudo tee {service_path} > /dev/null << 'KUMA_SERVICE_EOF'\n{service_content}KUMA_SERVICE_EOF"

                timer_result = ssh.execute(hostname, timer_cmd, username, port)
                if timer_result.success:
                    service_result = ssh.execute(hostname, service_cmd, username, port)
                    if service_result.success:
                        # Enable and start the timer
                        enable_cmd = f"sudo systemctl daemon-reload && sudo systemctl enable --now {timer_name}.timer"
                        enable_result = ssh.execute(hostname, enable_cmd, username, port)
                        if enable_result.success:
                            scheduling_method = "systemd"
                            scheduling_info = f"{timer_name}.timer"

            # Run the script once immediately to verify it works
            run_result = ssh.execute(hostname, script_path, username, port, timeout=30)

            result = {
                "status": "deployed",
                "script_path": script_path,
                "initial_run": {
                    "success": run_result.success,
                    "stdout": run_result.stdout,
                    "stderr": run_result.stderr,
                },
            }

            if scheduling_method:
                result["scheduling"] = {
                    "method": scheduling_method,
                    "info": scheduling_info,
                }
            else:
                result["scheduling"] = {
                    "method": "none",
                    "warning": "Neither crontab nor systemd available. Script deployed but not scheduled.",
                }

            return result

        except Exception as e:
            logger.exception(f"Failed to deploy push script to {hostname}")
            return {
                "status": "failed",
                "error": str(e),
            }

    def get_existing_monitors(self) -> list[dict]:
        """Get all existing monitors from Uptime Kuma."""
        kuma = get_kuma_client()
        return kuma.get_monitors()


def parse_web_ports_from_scan(open_ports: str) -> list[int]:
    """Extract web server ports from port scan output."""
    common_web_ports = [80, 443, 8080, 8443, 3000, 5000, 8000]
    found_ports = []

    for port in common_web_ports:
        if f":{port}" in open_ports or f" {port} " in open_ports:
            found_ports.append(port)

    return found_ports


def parse_docker_containers_from_scan(docker_output: str) -> list[dict]:
    """Parse Docker container info from scan output."""
    containers = []

    if "Docker not available" in docker_output or not docker_output.strip():
        return containers

    for line in docker_output.strip().split("\n"):
        if not line.strip():
            continue

        parts = line.split("\t")
        if len(parts) >= 2:
            containers.append({
                "id": parts[0] if len(parts) > 0 else "",
                "name": parts[1] if len(parts) > 1 else "",
                "image": parts[2] if len(parts) > 2 else "",
                "status": parts[3] if len(parts) > 3 else "",
                "ports": parts[4] if len(parts) > 4 else "",
            })

    return containers


# Global monitor service instance
_monitor_service: Optional[MonitorService] = None


def get_monitor_service() -> MonitorService:
    """Get the global monitor service instance."""
    global _monitor_service
    if _monitor_service is None:
        _monitor_service = MonitorService()
    return _monitor_service