decomposer: generate deliverable files for Define the service contract and project architecture for the FastAPI endpoint monitoring service.; Implement the typed monitor CRUD API and concurrency-safe in-memory state according to the service design.; Implement secure on-demand endpoint checks with status updates, latency measurement, robust error handling, and redacted structured logs.; Add operational API endpoints and environment-driven runtime configuration to the monitoring service.; Create automated tests for the monitoring service.; Package the service with Docker and developer documentation.; Validate the complete project.

app/models.py

@@ -1,57 +1,61 @@
 from datetime import datetime, timezone
 from enum import Enum
-from uuid import UUID
+from uuid import UUID, uuid4
 
-from pydantic import AnyHttpUrl, BaseModel, ConfigDict, Field, field_validator
+from pydantic import BaseModel, ConfigDict, Field, HttpUrl
 
 
-def utc_now() -> datetime:
+def now_utc() -> datetime:
     return datetime.now(timezone.utc)
 
 
 class MonitorState(str, Enum):
-    UNKNOWN = "unknown"
-    UP = "up"
-    DOWN = "down"
-    ERROR = "error"
+    unknown = "unknown"
+    up = "up"
+    down = "down"
 
 
-class CurrentStatus(BaseModel):
-    state: MonitorState = MonitorState.UNKNOWN
-    checked_at: datetime | None = None
-    latency_ms: float | None = Field(default=None, ge=0)
-    http_status: int | None = Field(default=None, ge=100, le=599)
-    error: str | None = Field(default=None, max_length=500)
-
-
-class MonitorFields(BaseModel):
-    model_config = ConfigDict(str_strip_whitespace=True)
-
+class MonitorCreate(BaseModel):
     name: str = Field(min_length=1, max_length=100)
-    target_url: AnyHttpUrl
-
-    @field_validator("target_url")
-    @classmethod
-    def reject_credentials(cls, value: AnyHttpUrl) -> AnyHttpUrl:
-        if value.username is not None or value.password is not None:
-            raise ValueError("URL credentials are not allowed")
-        return value
+    url: HttpUrl
+    timeout_seconds: float | None = Field(None, gt=0, le=60)
 
 
-class MonitorCreate(MonitorFields):
+class MonitorUpdate(BaseModel):
+    name: str | None = Field(None, min_length=1, max_length=100)
+    url: HttpUrl | None = None
+    timeout_seconds: float | None = Field(None, gt=0, le=60)
+
+
+class MonitorStatus(BaseModel):
+    state: MonitorState = MonitorState.unknown
+    checked_at: datetime | None = None
+    http_status: int | None = None
+    latency_ms: float | None = None
+    error: str | None = None
+
+
+class Monitor(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: UUID = Field(default_factory=uuid4)
+    name: str
+    url: HttpUrl
+    timeout_seconds: float
+    created_at: datetime = Field(default_factory=now_utc)
+    updated_at: datetime = Field(default_factory=now_utc)
+    status: MonitorStatus = Field(default_factory=MonitorStatus)
+
+
+class CheckResult(MonitorStatus):
     pass
 
 
-class MonitorUpdate(MonitorFields):
-    pass
+class ErrorBody(BaseModel):
+    code: str
+    message: str
+    details: list[dict[str, object]] | None = None
 
 
-class Monitor(MonitorFields):
-    id: UUID
-    created_at: datetime
-    updated_at: datetime
-    current_status: CurrentStatus
-
-
-class Health(BaseModel):
-    status: str
+class ErrorResponse(BaseModel):
+    error: ErrorBody