fix ssh

backend/app/services/device_discovery.py

@@ -155,32 +155,93 @@ async def _read_remote_config(
         return result.stdout
 
 
-async def _get_rack_hosts(obj: Object, db_password: str) -> list[tuple[str, str]]:
-    """Return list of (external_id, host_ip) from the object's racks table."""
-    if obj.db_via_tunnel and obj.server_ip and obj.ssh_user and obj.ssh_pass_enc:
-        ssh_password = decrypt(obj.ssh_pass_enc)
-        async with asyncssh.connect(
-            obj.server_ip,
-            port=obj.ssh_port or 22,
-            username=obj.ssh_user,
+def _parse_db_uri(uri: str) -> dict | None:
+    """Parse postgresql+psycopg2://user:pass@host:port/dbname → dict."""
+    try:
+        parsed = urlparse(uri)
+        if not parsed.hostname:
+            return None
+        return {
+            "host": parsed.hostname,
+            "port": parsed.port or 5432,
+            "user": parsed.username or "",
+            "password": parsed.password or "",
+            "dbname": (parsed.path or "").lstrip("/"),
+        }
+    except Exception:
+        return None
+
+
+async def _autodetect_db_from_server(
+    server_ip: str,
+    ssh_port: int,
+    ssh_user: str,
+    ssh_password: str,
+    server_config_path: str = "/etc/caps/config.ini",
+) -> dict | None:
+    """SSH into server, read its caps.conf, extract DB connection params."""
+    try:
+        config_text = await _read_remote_config(
+            host=server_ip,
+            port=ssh_port,
+            username=ssh_user,
             password=ssh_password,
+            config_path=server_config_path,
+        )
+    except Exception:
+        return None
+
+    parser = RawConfigParser()
+    parser.read_string(config_text)
+
+    db_uri = parser.get("server", "db_uri", fallback=None)
+    if db_uri:
+        return _parse_db_uri(db_uri)
+
+    # Fallback: try [database] section with individual fields
+    if parser.has_section("database"):
+        return {
+            "host": parser.get("database", "host", fallback=None),
+            "port": int(parser.get("database", "port", fallback="5432")),
+            "user": parser.get("database", "user", fallback=None),
+            "password": parser.get("database", "password", fallback=None),
+            "dbname": parser.get("database", "name", fallback=None),
+        }
+    return None
+
+
+async def _get_rack_hosts_direct(
+    host: str,
+    port: int,
+    user: str,
+    password: str,
+    dbname: str,
+    table: str,
+    via_tunnel: bool = False,
+    tunnel_host: str | None = None,
+    tunnel_ssh_port: int = 22,
+    tunnel_ssh_user: str | None = None,
+    tunnel_ssh_password: str | None = None,
+) -> list[tuple[str, str]]:
+    """Return list of (external_id, host_ip) from the racks table."""
+    if via_tunnel and tunnel_host and tunnel_ssh_user and tunnel_ssh_password:
+        async with asyncssh.connect(
+            tunnel_host,
+            port=tunnel_ssh_port,
+            username=tunnel_ssh_user,
+            password=tunnel_ssh_password,
             known_hosts=None,
         ) as tunnel:
-            listener = await tunnel.forward_local_port(
-                "127.0.0.1", 0, obj.db_host, obj.db_port or 5432
-            )
+            listener = await tunnel.forward_local_port("127.0.0.1", 0, host, port)
             local_port = listener.get_port()
             dsn = (
-                f"host=127.0.0.1 port={local_port} dbname={obj.db_name} "
-                f"user={obj.db_user} password={db_password} connect_timeout=10"
+                f"host=127.0.0.1 port={local_port} dbname={dbname} "
+                f"user={user} password={password} connect_timeout=10"
             )
-            return await _fetch_rack_hosts(dsn, obj.db_table)
+            return await _fetch_rack_hosts(dsn, table)
     else:
-        dsn = (
-            f"host={obj.db_host} port={obj.db_port or 5432} dbname={obj.db_name} "
-            f"user={obj.db_user} password={db_password} connect_timeout=10"
-        )
-        return await _fetch_rack_hosts(dsn, obj.db_table)
+        dsn = f"host={host} port={port} dbname={dbname} user={user} password={password} connect_timeout=10"
+        return await _fetch_rack_hosts(dsn, table)
 
 
 async def _fetch_rack_hosts(dsn: str, table: str) -> list[tuple[str, str]]:
@@ -205,27 +266,82 @@ class DiscoveryResult:
 async def discover_via_ssh(
     db: AsyncSession,
     obj: Object,
-    config_path: str = "/etc/caps/caps.conf",
+    config_path: str = "/etc/caps/config.ini",
 ) -> DiscoveryResult:
     result = DiscoveryResult()
 
-    if not all([obj.db_host, obj.db_name, obj.db_user, obj.db_pass_enc, obj.db_table]):
-        result.errors.append("Object DB connection is not fully configured")
-        return result
     if not obj.ssh_user or not obj.ssh_pass_enc:
-        result.errors.append("SSH credentials not configured on this object")
+        result.errors.append("SSH credentials not configured on this object (ssh_user / ssh_password)")
         return result
 
     try:
-        db_password = decrypt(obj.db_pass_enc)
         ssh_password = decrypt(obj.ssh_pass_enc)
     except Exception:
-        result.errors.append("Failed to decrypt stored credentials")
+        result.errors.append("Failed to decrypt SSH password")
+        return result
+
+    ssh_port = obj.ssh_port or 22
+
+    # ── Resolve DB connection ─────────────────────────────────────────────────
+    # Priority 1: fully configured DB on the object
+    # Priority 2: autodetect from server config via SSH (only server_ip needed)
+
+    db_host: str | None = obj.db_host
+    db_port: int = obj.db_port or 5432
+    db_name: str | None = obj.db_name
+    db_user: str | None = obj.db_user
+    db_password: str | None = None
+    db_table: str | None = obj.db_table
+
+    if db_host and db_name and db_user and obj.db_pass_enc and db_table:
+        try:
+            db_password = decrypt(obj.db_pass_enc)
+        except Exception:
+            result.errors.append("Failed to decrypt DB password")
+            return result
+    elif obj.server_ip:
+        # Autodetect: SSH into server, read its caps.conf to get DB URI
+        detected = await _autodetect_db_from_server(
+            server_ip=obj.server_ip,
+            ssh_port=ssh_port,
+            ssh_user=obj.ssh_user,
+            ssh_password=ssh_password,
+        )
+        if not detected or not all([detected.get("host"), detected.get("user"), detected.get("dbname")]):
+            result.errors.append(
+                "DB connection not configured and could not be auto-detected from server config. "
+                "Fill in the DB connection fields on the object or ensure /etc/caps/config.ini "
+                "on the server contains a [server] db_uri field."
+            )
+            return result
+        db_host = detected["host"]
+        db_port = detected["port"]
+        db_user = detected["user"]
+        db_password = detected["password"]
+        db_name = detected["dbname"]
+        db_table = db_table or obj.db_table or "racks"
+    else:
+        result.errors.append(
+            "DB connection not configured. Either fill in the DB fields on the object "
+            "or set server_ip so the DB can be auto-detected via SSH."
+        )
         return result
 
     # Step 1: get rack hosts from object's DB
     try:
-        rack_hosts = await _get_rack_hosts(obj, db_password)
+        rack_hosts = await _get_rack_hosts_direct(
+            host=db_host,
+            port=db_port,
+            user=db_user,
+            password=db_password or "",
+            dbname=db_name,
+            table=db_table,
+            via_tunnel=obj.db_via_tunnel,
+            tunnel_host=obj.server_ip,
+            tunnel_ssh_port=ssh_port,
+            tunnel_ssh_user=obj.ssh_user,
+            tunnel_ssh_password=ssh_password,
+        )
     except Exception as exc:
         result.errors.append(f"Cannot fetch rack hosts from object DB: {exc}")
         return result

frontend/src/hooks/useMonitorSSE.ts

@@ -64,9 +64,10 @@ export function useMonitorSSE(handlers: MonitorHandlers) {
           // ignore parse errors
         }
       },
-      onerror() {
-        // fetchEventSource retries automatically; abort only on explicit error
+      onerror(err) {
+        // throw — stops fetchEventSource from auto-retrying
         ctrl.abort()
+        throw err
       },
     })