From dcecec8e7a9aa7fc574907229acb8d5b1a42557b Mon Sep 17 00:00:00 2001
From: demo-bot <demo-bot@kyndryl.com>
Date: Sun, 9 Aug 2026 16:07:02 +0000
Subject: [PATCH] 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 | 70 +++++++++++++++++++++++----------------------------
 1 file changed, 31 insertions(+), 39 deletions(-)

diff --git a/app/models.py b/app/models.py
index 237a4ea..2e2c92d 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1,65 +1,57 @@
 from datetime import datetime, timezone
 from enum import Enum
-from typing import Annotated
 from uuid import UUID
 
-from pydantic import AnyHttpUrl, BaseModel, ConfigDict, Field, StringConstraints, field_validator
-
-Name = Annotated[str, StringConstraints(strip_whitespace=True, min_length=1, max_length=100)]
+from pydantic import AnyHttpUrl, BaseModel, ConfigDict, Field, field_validator
 
 
-def utcnow() -> datetime:
+def utc_now() -> datetime:
     return datetime.now(timezone.utc)
 
 
-class MonitorStatus(str, Enum):
-    unknown = "unknown"
-    up = "up"
-    down = "down"
-    error = "error"
+class MonitorState(str, Enum):
+    UNKNOWN = "unknown"
+    UP = "up"
+    DOWN = "down"
+    ERROR = "error"
 
 
-class MonitorCreate(BaseModel):
-    name: Name
-    url: AnyHttpUrl
+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)
 
-    @field_validator("url")
+
+class MonitorFields(BaseModel):
+    model_config = ConfigDict(str_strip_whitespace=True)
+
+    name: str = Field(min_length=1, max_length=100)
+    target_url: AnyHttpUrl
+
+    @field_validator("target_url")
     @classmethod
-    def no_credentials(cls, value: AnyHttpUrl) -> AnyHttpUrl:
-        if value.username or value.password:
+    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
 
 
-class MonitorUpdate(MonitorCreate):
+class MonitorCreate(MonitorFields):
     pass
 
 
-class Monitor(BaseModel):
-    model_config = ConfigDict(frozen=True)
+class MonitorUpdate(MonitorFields):
+    pass
+
+
+class Monitor(MonitorFields):
     id: UUID
-    name: str
-    url: AnyHttpUrl
-    status: MonitorStatus = MonitorStatus.unknown
     created_at: datetime
     updated_at: datetime
-    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 = None
+    current_status: CurrentStatus
 
 
-class CheckResult(BaseModel):
-    status: MonitorStatus
-    checked_at: datetime
-    latency_ms: float = Field(ge=0)
-    http_status: int | None = None
-    error: str | None = None
-
-
-class StatusResponse(CheckResult):
-    id: UUID
-
-
-class ProbeResponse(BaseModel):
+class Health(BaseModel):
     status: str