Merge pull request #5 from beatz174-bit/codex/verify-metrics-creation-for-prometheus

Log emitted Prometheus metrics and set last_check timestamp in docker exporter

docker-compose.generated.yml

@@ -0,0 +1,189 @@
+# Generated from services-up.sh compose file list
+# Note: apps/shift-recorder/docker-compose.yml and apps/stockfill/docker-compose.yml
+# are referenced by services-up.sh but do not exist in this checkout.
+services:
+  authelia:
+    build:
+      context: ${PROJECT_ROOT}/core/authelia
+    image: authelia/authelia
+    profiles:
+    - core
+    - all
+    - traefik
+    x-source-compose: core/docker-compose.yml
+  crowdsec:
+    build: ${PROJECT_ROOT}/core/crowdsec
+    profiles:
+    - core
+    - all
+    - traefik
+    x-source-compose: core/docker-compose.yml
+  docker-update-exporter:
+    build:
+      context: ${PROJECT_ROOT}/monitoring/docker-exporter
+    profiles:
+    - monitoring
+    - all
+    - prometheus-exporters
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  docker-update-exporter-test:
+    build:
+      context: ${PROJECT_ROOT}/core/test
+    profiles:
+    - test
+    x-source-compose: core/test/docker-compose.yml
+  error-pages:
+    image: tarampampam/error-pages:3
+    profiles:
+    - core
+    - all
+    - traefik
+    x-source-compose: core/docker-compose.yml
+  gitea:
+    image: gitea/gitea:latest
+    profiles:
+    - apps
+    - all
+    - gitea
+    x-source-compose: apps/gitea/docker-compose.yml
+  gotify:
+    image: gotify/server:latest
+    profiles:
+    - monitoring
+    - all
+    - gotify
+    x-source-compose: monitoring/gotify/docker-compose.yml
+  grafana:
+    image: grafana/grafana:latest
+    profiles:
+    - monitoring
+    - all
+    - grafana
+    x-source-compose: monitoring/grafana/docker-compose.yml
+  gramps-db:
+    image: postgres:13
+    profiles:
+    - apps
+    - all
+    - gramps
+    x-source-compose: apps/gramps/docker-compose.yml
+  grampsweb:
+    image: ghcr.io/gramps-project/grampsweb:latest
+    profiles:
+    - apps
+    - all
+    - gramps
+    x-source-compose: apps/gramps/docker-compose.yml
+  influxdb:
+    image: influxdb:2.7
+    profiles:
+    - monitoring
+    - all
+    - prometheus
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  monitor-kuma:
+    image: louislam/uptime-kuma:2.1.1
+    profiles:
+    - monitoring
+    - all
+    - uptime-kuma
+    x-source-compose: monitoring/uptime-kuma/docker-compose.yml
+  nextcloud-db:
+    image: mariadb:11.4
+    profiles:
+    - apps
+    - all
+    - nextcloud
+    x-source-compose: apps/nextcloud/docker-compose.yml
+  nextcloud-redis:
+    image: redis
+    profiles:
+    - apps
+    - all
+    - nextcloud
+    x-source-compose: apps/nextcloud/docker-compose.yml
+  nextcloud-webapp:
+    build:
+      context: ${PROJECT_ROOT}/apps/nextcloud
+    profiles:
+    - apps
+    - all
+    - nextcloud
+    x-source-compose: apps/nextcloud/docker-compose.yml
+  node-exporter:
+    image: prom/node-exporter:latest
+    profiles:
+    - monitoring
+    - all
+    - prometheus-exporters
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  node-red:
+    build:
+      context: ${PROJECT_ROOT}/monitoring/node-red
+    profiles:
+    - monitoring
+    - all
+    x-source-compose: monitoring/node-red/docker-compose.yml
+  passbolt-db:
+    image: mariadb:12
+    profiles:
+    - apps
+    - all
+    - passbolt
+    x-source-compose: apps/passbolt/docker-compose.yml
+  passbolt-webapp:
+    image: passbolt/passbolt:latest-ce
+    profiles:
+    - apps
+    - all
+    - passbolt
+    x-source-compose: apps/passbolt/docker-compose.yml
+  pihole-exporter:
+    image: ekofr/pihole-exporter:latest
+    profiles:
+    - monitoring
+    - all
+    - prometheus-exporters
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  portainer:
+    image: portainer/portainer-ce:latest
+    profiles:
+    - monitoring
+    - all
+    - portainer
+    x-source-compose: monitoring/portainer/docker-compose.yml
+  prometheus:
+    image: prom/prometheus:latest
+    profiles:
+    - monitoring
+    - all
+    - prometheus
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  searxng-webapp:
+    image: searxng/searxng
+    profiles:
+    - apps
+    - all
+    - searxng
+    x-source-compose: apps/searxng/docker-compose.yml
+  telegraf:
+    image: telegraf:latest
+    profiles:
+    - monitoring
+    - all
+    - prometheus
+    x-source-compose: monitoring/prometheus/docker-compose.yml
+  traefik:
+    build:
+      context: ${PROJECT_ROOT}/core
+    image: traefik:3
+    profiles:
+    - core
+    - all
+    - traefik
+    x-source-compose: core/docker-compose.yml
+  update-test:
+    image: nginx:1.27.4
+    profiles:
+    - test
+    x-source-compose: core/test/docker-compose.yml

monitoring/docker-exporter/TEST_EXAMPLE.md

@@ -0,0 +1,24 @@
+# Exporter image-mapping test example
+
+Run the exporter in dry-run mode to print the `service -> image:tag` mapping without starting the metrics loop:
+
+```bash
+SERVICES_UP_SCRIPT=/workspace/docker/services-up.sh python monitoring/docker-exporter/exporter.py --dry-run
+```
+
+Example output excerpt:
+
+```json
+{
+  "crowdsec": "crowdsecurity/crowdsec:latest",
+  "docker-update-exporter": "python:3.11-slim",
+  "nextcloud-webapp": "nextcloud:production",
+  "node-red": "nodered/node-red:latest",
+  "prometheus": "prom/prometheus:latest",
+  "traefik": "traefik:3"
+}
+```
+
+This confirms the exporter now reports images for both:
+- services with explicit `image:` values, and
+- services using `build:` contexts.

monitoring/docker-exporter/exporter.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+import argparse
 import os
 import re
 import time
@@ -21,10 +22,15 @@ logger = logging.getLogger("docker-update-exporter")
 EXPORTER_PORT = 9105
 CHECK_INTERVAL = 60
 CACHE_TTL = 6 * 3600
-SERVICES_UP_SCRIPT = "/compose/services-up.sh"
-CACHE_FILE = "/data/remote_digest_cache.json"
+SERVICES_UP_SCRIPT = os.getenv("SERVICES_UP_SCRIPT", "/compose/services-up.sh")
+CACHE_FILE = os.getenv("CACHE_FILE", "/data/remote_digest_cache.json")
+DRY_RUN = os.getenv("DRY_RUN", "false").lower() in ("1", "true", "yes")
 
-client = docker.from_env()
+try:
+    client = docker.from_env()
+except Exception as e:
+    logger.warning(f"Docker client unavailable at startup: {e}")
+    client = None
 
 # --- Metrics ---
 CONTAINER_UPDATE = Gauge(
@@ -38,6 +44,29 @@ LAST_CHECK = Gauge(
     "Last time the update check ran (unix timestamp)"
 )
 
+
+def set_container_update_metric(container_name, compose_image, running_image, project_name, update_flag):
+    """Set update metric for a container and log the emitted metric payload."""
+    metric_labels = {
+        "container": container_name,
+        "compose_image": compose_image or "unknown",
+        "running_image": running_image,
+        "com_docker_compose_project": project_name,
+    }
+    CONTAINER_UPDATE.labels(**metric_labels).set(update_flag)
+    logger.info(
+        "Metric emitted: docker_container_update_available=%s labels=%s",
+        update_flag,
+        metric_labels,
+    )
+
+
+def set_last_check_metric():
+    """Set and log the timestamp for the most recent check cycle."""
+    ts = time.time()
+    LAST_CHECK.set(ts)
+    logger.info("Metric emitted: docker_image_update_last_check_timestamp=%s", ts)
+
 # --- Persistent Cache ---
 def load_cache():
     if not os.path.exists(CACHE_FILE):
@@ -79,6 +108,8 @@ def get_project_prefix_from_script(script_path):
     return prefix
 
 def get_local_digest(image_name):
+    if client is None:
+        return None
     try:
         img = client.images.get(image_name)
         digests = img.attrs.get("RepoDigests", [])
@@ -159,41 +190,111 @@ def parse_dockerfile_for_image(dockerfile_path):
     if not os.path.exists(dockerfile_path):
         return None
 
-    image_name = None
-
     try:
+        arg_defaults = {}
+        last_from = None
         with open(dockerfile_path) as df:
             for line in df:
                 line = line.strip()
-                # Prefer LABEL with image if present
+                if not line or line.startswith("#"):
+                    continue
+
+                if line.upper().startswith("ARG "):
+                    arg_body = line[4:].strip()
+                    if "=" in arg_body:
+                        key, value = arg_body.split("=", 1)
+                        arg_defaults[key.strip()] = value.strip()
+                    continue
+
+                # Prefer LABEL with image if present.
                 if "LABEL" in line and "image=" in line:
                     match = re.search(r'image=["\']?([^"\']+)["\']?', line)
                     if match:
-                        image_name = match.group(1)
+                        image_name = normalize_image_name(substitute_dockerfile_args(match.group(1), arg_defaults))
                         logger.debug(f"Found LABEL image={image_name} in {dockerfile_path}")
                         return image_name
 
-            # If no LABEL, use the FROM line as fallback
-            df.seek(0)
-            for line in df:
-                line = line.strip()
                 if line.upper().startswith("FROM "):
-                    parts = line.split()
-                    if len(parts) >= 2:
-                        base_image = parts[1]
-                        logger.debug(f"Found base FROM {base_image} in {dockerfile_path}")
-                        return base_image
+                    from_clause = line[5:].strip()
+                    if from_clause.startswith("--"):
+                        split_clause = from_clause.split(None, 1)
+                        if len(split_clause) < 2:
+                            continue
+                        from_clause = split_clause[1]
+
+                    parts = from_clause.split()
+                    if not parts:
+                        continue
+
+                    candidate = substitute_dockerfile_args(parts[0], arg_defaults)
+                    if candidate and candidate.lower() != "scratch":
+                        last_from = normalize_image_name(candidate)
+
+        if last_from:
+            logger.debug(f"Found base FROM {last_from} in {dockerfile_path}")
+            return last_from
     except Exception as e:
         logger.debug(f"Error reading Dockerfile {dockerfile_path}: {e}")
 
+    return None
+
+def normalize_image_name(image_name):
+    if not image_name:
+        return None
+    if "@" in image_name:
         return image_name
+    if ":" in image_name.rsplit("/", 1)[-1]:
+        return image_name
+    return f"{image_name}:latest"
+
+def is_compose_build_placeholder(image_name, project_name):
+    if not image_name:
+        return False
+    candidate = str(image_name)
+    project_prefix = f"{project_name}-"
+    if candidate.startswith(project_prefix):
+        return True
+    # Keep backward-compatible behavior for historical default project prefix.
+    return candidate.startswith("core-")
+
+def substitute_dockerfile_args(value, arg_defaults):
+    if not value:
+        return value
+
+    pattern = re.compile(r"\$\{([^}]+)\}|\$([A-Za-z_][A-Za-z0-9_]*)")
+
+    def replacer(match):
+        expr = match.group(1)
+        simple = match.group(2)
+        if simple:
+            return arg_defaults.get(simple, "")
+
+        if ":-" in expr:
+            var_name, default_value = expr.split(":-", 1)
+            return arg_defaults.get(var_name, default_value)
+        if "-" in expr:
+            var_name, default_value = expr.split("-", 1)
+            return arg_defaults.get(var_name, default_value)
+        return arg_defaults.get(expr, "")
+
+    return pattern.sub(replacer, value)
+
+def expand_compose_path(path_value, project_root):
+    raw = str(path_value)
+    raw = raw.replace("${PROJECT_ROOT}", project_root).replace("$PROJECT_ROOT", project_root)
+    return os.path.expandvars(raw)
+
+def get_project_root_from_script(script_path):
+    if not script_path:
+        return os.getcwd()
+    return os.path.dirname(os.path.abspath(script_path))
 
 # --- Compose parsing ---
 def get_compose_files_from_script(script_path):
     files = []
     if not os.path.exists(script_path):
         return files
-    base_dir = os.path.dirname(script_path)
+    base_dir = get_project_root_from_script(script_path)
     try:
         with open(script_path) as f:
             content = f.read()
@@ -210,33 +311,87 @@ def get_compose_files_from_script(script_path):
         logger.warning(f"Failed parsing services-up.sh: {e}")
     return files
 
-def parse_compose_services(compose_files):
+def parse_project_name_from_script(script_path):
+    project = "core"
+    if not os.path.exists(script_path):
+        return project
+    try:
+        with open(script_path) as f:
+            for line in f:
+                m = re.match(r'PROJECT\s*=\s*["\']?([^"\']+)', line)
+                if m:
+                    project = m.group(1)
+                    break
+    except Exception as e:
+        logger.warning(f"Failed reading project name: {e}")
+    return project
+
+def resolve_local_build_image(service_name, project_name):
+    if client is None:
+        return None
+    try:
+        images = client.images.list(filters={"label": f"com.docker.compose.service={service_name}"})
+        for image in images:
+            labels = image.attrs.get("Config", {}).get("Labels", {}) or {}
+            if labels.get("com.docker.compose.project") != project_name:
+                continue
+            for tag in image.tags:
+                if tag and "<none>" not in tag:
+                    logger.debug(f"Resolved local compose image for {service_name}: {tag}")
+                    return normalize_image_name(tag)
+    except Exception as e:
+        logger.debug(f"Could not inspect local build metadata for {service_name}: {e}")
+    return None
+
+def parse_compose_services(compose_files, project_name, project_root):
     svc_map = {}
     for f in compose_files:
+        if not os.path.exists(f):
+            logger.warning(f"Compose file from services-up.sh is missing: {f}")
+            continue
         try:
             with open(f) as stream:
                 data = yaml.safe_load(stream) or {}
             for svc_name, svc_def in data.get("services", {}).items():
-                image = svc_def.get("image")
-                is_built = False
-                if not image and "build" in svc_def:
-                    is_built = True
-                    build_ctx = svc_def["build"]
+                image = normalize_image_name(svc_def.get("image"))
+                profiles = svc_def.get("profiles", [])
+                build_ctx = svc_def.get("build")
                 dockerfile_path = None
+                from_dockerfile = None
+                local_built_image = None
 
+                if build_ctx:
                     if isinstance(build_ctx, dict):
                         context = build_ctx.get("context", ".")
-                        dockerfile_path = os.path.join(context, build_ctx.get("dockerfile", "Dockerfile"))
-                    elif isinstance(build_ctx, str):
-                        dockerfile_path = os.path.join(build_ctx, "Dockerfile")
+                        dockerfile = build_ctx.get("dockerfile", "Dockerfile")
+                    else:
+                        context = build_ctx
+                        dockerfile = "Dockerfile"
 
-                    image = parse_dockerfile_for_image(dockerfile_path)
+                    compose_dir = os.path.dirname(f)
+                    context_expanded = expand_compose_path(context, project_root)
+                    if os.path.isabs(context_expanded):
+                        context_path = context_expanded
+                    else:
+                        context_path = os.path.normpath(os.path.join(compose_dir, context_expanded))
+                    dockerfile_expanded = expand_compose_path(dockerfile, project_root)
+                    dockerfile_path = os.path.normpath(os.path.join(context_path, dockerfile_expanded))
+                    from_dockerfile = normalize_image_name(parse_dockerfile_for_image(dockerfile_path))
+                    local_built_image = resolve_local_build_image(svc_name, project_name)
 
-                if not image:
-                    logger.info(f"Defaulting build image for {svc_name} to {svc_name}:latest")
-                    image = f"{svc_name}:latest"
+                placeholder_image = is_compose_build_placeholder(image, project_name) or is_compose_build_placeholder(local_built_image, project_name)
+                if placeholder_image:
+                    resolved_image = from_dockerfile or image or local_built_image or f"{project_name}-{svc_name}:latest"
+                else:
+                    resolved_image = image or local_built_image or from_dockerfile or f"{project_name}-{svc_name}:latest"
 
-                svc_map[svc_name] = (image, is_built)
+                svc_map[svc_name] = {
+                    "image": resolved_image,
+                    "profiles": profiles,
+                    "build_context": build_ctx,
+                    "compose_file": f,
+                    "dockerfile": dockerfile_path
+                }
         except Exception as e:
             logger.warning(f"Failed parsing {f}: {e}")
 
@@ -245,11 +400,17 @@ def parse_compose_services(compose_files):
 
 # --- Main check ---
 def check_containers():
+    if client is None:
+        logger.error("Docker client is unavailable; skipping check cycle")
+        return
+
+    set_last_check_metric()
     CONTAINER_UPDATE.clear()
 
-    prefix = get_project_prefix_from_script(SERVICES_UP_SCRIPT)
+    project_name = parse_project_name_from_script(SERVICES_UP_SCRIPT)
+    project_root = get_project_root_from_script(SERVICES_UP_SCRIPT)
     compose_files = get_compose_files_from_script(SERVICES_UP_SCRIPT)
-    svc_map = parse_compose_services(compose_files)
+    svc_map = parse_compose_services(compose_files, project_name, project_root)
 
     containers = client.containers.list()
     for container in containers:
@@ -261,30 +422,69 @@ def check_containers():
         running = container.attrs["Config"]["Image"]
 
         compose_image = None
-        is_built = False
         if svc in svc_map:
-            compose_image, is_built = svc_map[svc]
-            if is_built:
-                name, _, _ = compose_image.partition(":")
-                compose_image = f"{prefix}{name}"
+            compose_image = svc_map[svc]["image"]
 
         update_flag = 0
 
         local_digest = get_local_digest(running)
-        remote_digest = get_remote_digest(compose_image if is_built else running)
+        remote_target = compose_image or running
+        remote_digest = get_remote_digest(remote_target)
 
         if local_digest and remote_digest and local_digest != remote_digest:
             update_flag = 1
 
-        CONTAINER_UPDATE.labels(
-            container=container.name,
-            compose_image=compose_image or "unknown",
+        set_container_update_metric(
+            container_name=container.name,
+            compose_image=compose_image,
             running_image=running,
-            com_docker_compose_project=proj
-        ).set(update_flag)
+            project_name=proj,
+            update_flag=update_flag,
+        )
+
+def dump_service_image_mapping():
+    project_name = parse_project_name_from_script(SERVICES_UP_SCRIPT)
+    project_root = get_project_root_from_script(SERVICES_UP_SCRIPT)
+    compose_files = get_compose_files_from_script(SERVICES_UP_SCRIPT)
+    svc_map = parse_compose_services(compose_files, project_name, project_root)
+    mapping = {name: data["image"] for name, data in sorted(svc_map.items())}
+    logger.info("Service to image mapping:")
+    logger.info(json.dumps(mapping, indent=2, sort_keys=True))
+    return mapping
 
 # --- Runner ---
 if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Docker image update exporter")
+    parser.add_argument("--dry-run", action="store_true", help="Only print service->image mapping and exit")
+    parser.add_argument(
+        "--services-up-script",
+        default=SERVICES_UP_SCRIPT,
+        help=f"Path to services-up script (default: {SERVICES_UP_SCRIPT})",
+    )
+    parser.add_argument(
+        "--cache-file",
+        default=CACHE_FILE,
+        help=f"Path to digest cache file (default: {CACHE_FILE})",
+    )
+    parser.add_argument(
+        "--log-level",
+        default=LOG_LEVEL,
+        help=f"Logging level (default: {LOG_LEVEL})",
+    )
+    args = parser.parse_args()
+
+    effective_log_level = str(args.log_level).upper()
+    logging.getLogger().setLevel(getattr(logging, effective_log_level, logging.DEBUG))
+    logger.setLevel(getattr(logging, effective_log_level, logging.DEBUG))
+
+    SERVICES_UP_SCRIPT = args.services_up_script
+    CACHE_FILE = args.cache_file
+    REMOTE_DIGEST_CACHE = load_cache()
+
+    if DRY_RUN or args.dry_run:
+        dump_service_image_mapping()
+        raise SystemExit(0)
+
     start_http_server(EXPORTER_PORT)
     while True:
         try: