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

@@ -1,9 +1,12 @@
 from datetime import datetime, timezone
 from enum import StrEnum
-from typing import Self
 from uuid import UUID
 
-from pydantic import BaseModel, ConfigDict, Field, HttpUrl, model_validator
+from pydantic import BaseModel, ConfigDict, Field, HttpUrl
+
+
+def utcnow() -> datetime:
+    return datetime.now(timezone.utc)
 
 
 class State(StrEnum):
@@ -13,49 +16,22 @@ class State(StrEnum):
     ERROR = "error"
 
 
+class MonitorInput(BaseModel):
+    model_config = ConfigDict(str_strip_whitespace=True)
+
+    name: str = Field(min_length=1, max_length=100)
+    url: HttpUrl
+
+
 class CurrentStatus(BaseModel):
-    model_config = ConfigDict(extra="forbid")
     state: State = State.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)
-    final_url: str | None = None
-    error: str | None = None
-
-
-class MonitorCreate(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-    name: str = Field(min_length=1, max_length=120)
-    url: HttpUrl
-
-    @model_validator(mode="after")
-    def safe_url_shape(self) -> Self:
-        if self.url.scheme not in {"http", "https"}:
-            raise ValueError("only http and https URLs are supported")
-        if self.url.username is not None or self.url.password is not None:
-            raise ValueError("URL credentials are not allowed")
-        return self
-
-
-class MonitorUpdate(BaseModel):
-    model_config = ConfigDict(extra="forbid")
-    name: str | None = Field(default=None, min_length=1, max_length=120)
-    url: HttpUrl | None = None
-
-    @model_validator(mode="after")
-    def validate_update(self) -> Self:
-        if self.name is None and self.url is None:
-            raise ValueError("at least one field is required")
-        if self.url is not None:
-            if self.url.scheme not in {"http", "https"}:
-                raise ValueError("only http and https URLs are supported")
-            if self.url.username is not None or self.url.password is not None:
-                raise ValueError("URL credentials are not allowed")
-        return self
+    status_code: int | None = Field(default=None, ge=100, le=599)
+    error_code: str | None = None
 
 
 class Monitor(BaseModel):
-    model_config = ConfigDict(extra="forbid")
     id: UUID
     name: str
     url: HttpUrl
@@ -64,5 +40,14 @@ class Monitor(BaseModel):
     current_status: CurrentStatus
 
 
-def utcnow() -> datetime:
-    return datetime.now(timezone.utc)
+class CheckResult(CurrentStatus):
+    monitor_id: UUID
+
+
+class ErrorBody(BaseModel):
+    code: str
+    message: str
+
+
+class ErrorEnvelope(BaseModel):
+    error: ErrorBody