FabledSteward/plugins/docker/models.py

# plugins/docker/models.py
from __future__ import annotations
from datetime import datetime, timezone
from sqlalchemy import (
    BigInteger, Boolean, DateTime, Float, ForeignKey, Index, Integer, String, Text,
)
from sqlalchemy.orm import Mapped, mapped_column
from steward.models.base import Base
from steward.core.ids import time_ordered_id


class DockerContainer(Base):
    """Latest known state per container, scoped to the host that reported it.

    Collection is per-host via the host agent, so container names are only
    unique within a host — the natural key is (host_id, name). host_id is NOT
    NULL: every container arrives through a host_agent ingest that resolves a
    Host first. Deleting a host cascades its containers away.
    """
    __tablename__ = "docker_containers"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    name: Mapped[str] = mapped_column(String(255), primary_key=True)
    container_id: Mapped[str] = mapped_column(String(64), nullable=False, default="")
    image: Mapped[str] = mapped_column(String(512), nullable=False, default="")
    status: Mapped[str] = mapped_column(String(32), nullable=False, default="unknown")
    # running | stopped | paused | exited | dead
    cpu_pct: Mapped[float | None] = mapped_column(Float, nullable=True)
    # BigInteger: a container's memory usage/limit routinely exceeds 2^31 bytes
    # (~2.1 GB), which overflows int4 and fails the insert. Used is what its
    # processes hold (anon + shmem); file cache is kept apart, since the kernel
    # gives it back when the host needs it (#6030). used_pct is of the limit,
    # which is the host's RAM when none is set.
    mem_used_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    mem_limit_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    mem_used_pct: Mapped[float | None] = mapped_column(Float, nullable=True)
    mem_cache_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    restart_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    ports_json: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    # JSON: [{"host_port": 8080, "container_port": 80, "protocol": "tcp"}]
    started_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    scraped_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )

    # ── Enrichment (agent ≥ 1.4.0) ────────────────────────────────────────────
    # Health/exit/restart come from `docker inspect` (not the list endpoint);
    # exit_code is only meaningful for stopped containers.
    health: Mapped[str | None] = mapped_column(String(16), nullable=True)  # healthy|unhealthy|starting
    exit_code: Mapped[int | None] = mapped_column(Integer, nullable=True)
    oom_killed: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    # Grouping: compose project + swarm placement, read off container labels.
    compose_project: Mapped[str | None] = mapped_column(String(255), nullable=True)
    service_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    task_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
    node_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
    # Cumulative-since-start I/O counters (BigInteger — they exceed 2^31 quickly).
    net_rx_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    net_tx_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    blk_read_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    blk_write_bytes: Mapped[int | None] = mapped_column(BigInteger, nullable=True)


class DockerEvent(Base):
    """Lifecycle events derived by diffing consecutive host snapshots.

    The agent only reports current state, so Steward synthesises lifecycle by
    comparing each new snapshot against the stored DockerContainer state for the
    host: a container that appears → `start`; one that vanishes → `stop`; a
    transition to a stopped status with a non-zero exit → `die`; an OOM-kill
    flip → `oom`; a health status change → `health_change`. Scoped to the
    reporting host (names are only unique within a host). `event` is a plain
    string (no CHECK whitelist), matching how `status` is modelled on
    DockerContainer — keeps the value set open without a migration per addition.
    """
    __tablename__ = "docker_events"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=time_ordered_id
    )
    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), nullable=False
    )
    container_name: Mapped[str] = mapped_column(String(255), nullable=False)
    event: Mapped[str] = mapped_column(String(16), nullable=False)
    # start | restart | stop | die | oom | health_change
    detail: Mapped[str | None] = mapped_column(String(255), nullable=True)
    # e.g. "exit 137", "healthy→unhealthy", image on start
    at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )

    # Timeline lookups filter on (host_id, container_name) and sort by time;
    # retention prunes by `at` alone — index both access paths.
    __table_args__ = (
        Index("ix_docker_events_host_container_time",
              "host_id", "container_name", "at"),
        Index("ix_docker_events_at", "at"),
    )


class DockerLog(Base):
    """Container log lines pushed by the host agent — one row per line.

    Time-series, scoped to the reporting host (container names are only unique
    within a host, same identity as docker_containers). The agent tails each running
    container incrementally and folds new lines into its metrics push; `ts` is the
    line's own Docker timestamp. Bounded by a per-container size+age ring
    (retention), so a chatty container just keeps a shorter window rather than
    growing without limit.
    """
    __tablename__ = "docker_logs"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=time_ordered_id
    )
    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), nullable=False, index=True
    )
    container_name: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    ts: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )
    stream: Mapped[str] = mapped_column(String(8), nullable=False, default="stdout")
    # stdout | stderr
    line: Mapped[str] = mapped_column(Text, nullable=False, default="")

    # Viewer filters on (host_id, container_name) and sorts by time; the ring
    # prune walks the same key newest-first. A second index on `ts` alone serves
    # the age-cutoff delete. Twin-index idiom, mirroring docker_events.
    __table_args__ = (
        Index("ix_docker_logs_host_container_time",
              "host_id", "container_name", "ts"),
        Index("ix_docker_logs_ts", "ts"),
    )


class DockerSwarmService(Base):
    """A Swarm service as seen by a manager host: desired vs running replicas.

    Manager-scoped — only a host that is a Swarm manager reports these, so a
    single-manager cluster yields one row set keyed by that host. Service names
    are unique within a swarm; we still key by (host_id, service_name) so two
    managers reporting independently don't collide.
    """
    __tablename__ = "docker_swarm_services"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    service_name: Mapped[str] = mapped_column(String(255), primary_key=True)
    mode: Mapped[str] = mapped_column(String(16), nullable=False, default="replicated")
    # replicated | global
    desired: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    running: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    image: Mapped[str | None] = mapped_column(String(512), nullable=True)
    # task→node placement of running replicas: [{"node_id", "running"}], JSON.
    # A manager sees every task, so this captures cross-node placement that the
    # local docker_containers rows (this host only) can't.
    placement_json: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    # The service's newest tasks, newest first, as the manager's agent shaped
    # them: [{"task_id", "slot", "node_id", "desired_state", "state", "message",
    # "error", "exit_code", "at"}], JSON. Swarm's own record of which tasks it
    # replaced and why each one stopped; "[]" from agents older than 1.8.0.
    tasks_json: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DockerDiskUsage(Base):
    """Per-host Docker disk usage summary from `/system/df` (current state).

    One row per host (the agent re-reports the full summary each interval).
    Reclaimable = bytes held by images no container references. Sizes are bytes
    (BigInteger — image caches exceed 2^31 easily).
    """
    __tablename__ = "docker_disk_usage"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    layers_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    images_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    images_reclaimable: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    containers_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    volumes_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    build_cache_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    images_total: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    images_active: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    containers_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    volumes_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DockerImage(Base):
    """Per-host image storage record (the heavy hitters from `/system/df`).

    Keyed (host_id, image_id); `containers` is the reference count (0 ⇒ the
    image's size is reclaimable). Replaced wholesale per host on each report.
    """
    __tablename__ = "docker_images"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    image_id: Mapped[str] = mapped_column(String(64), primary_key=True)
    repo_tag: Mapped[str] = mapped_column(String(512), nullable=False, default="<none>")
    size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    shared_size: Mapped[int] = mapped_column(BigInteger, nullable=False, default=0)
    containers: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DockerSwarmNode(Base):
    """A Swarm node as seen by a manager host: role / availability / status."""
    __tablename__ = "docker_swarm_nodes"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    node_id: Mapped[str] = mapped_column(String(64), primary_key=True)
    hostname: Mapped[str] = mapped_column(String(255), nullable=False, default="")
    role: Mapped[str] = mapped_column(String(16), nullable=False, default="worker")
    # manager | worker
    availability: Mapped[str] = mapped_column(String(16), nullable=False, default="active")
    # active | pause | drain
    status: Mapped[str] = mapped_column(String(16), nullable=False, default="unknown")
    # ready | down | unknown
    leader: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DockerHostStatus(Base):
    """Whether Docker answered on a host at its agent's last report (agent ≥ 1.9.0).

    "ok" when it did; "unavailable" when there is no Docker to ask (no socket,
    nothing listening); "error" when Docker is there and the call failed.
    `detail` says why for the last two. While a host is not "ok" its container
    rows are what Docker last said, not what is true now, and read as stale.
    A host that never had Docker gets no row.
    """
    __tablename__ = "docker_host_status"

    host_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("hosts.id", ondelete="CASCADE"), primary_key=True
    )
    status: Mapped[str] = mapped_column(String(16), nullable=False)
    detail: Mapped[str | None] = mapped_column(String(255), nullable=True)
    # When the status last changed, and the agent's newest report.
    since: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    reported_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)