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.

README.md

@@ -1,77 +1,71 @@
-# Endpoint Monitor API
+# Endpoint Monitor Service
 
-A typed FastAPI service for process-local endpoint monitors and secure, on-demand HTTP checks.
+A typed FastAPI service that stores endpoint monitors in concurrency-safe process memory and
+runs SSRF-aware on-demand HTTP checks.
 
-## Features
+## Quick start
 
-- CRUD monitor resources and current-status retrieval
-- bounded HTTP/HTTPS checks with latency measurement
-- SSRF protection on every DNS lookup and redirect hop
-- JSON logs with URL credentials, query strings, and fragments redacted
-- health/readiness endpoints and validated `MONITOR_` environment settings
-- concurrency-safe in-memory state
+Requires Python 3.12.
 
-## Layout
-
-- `docs/service-contract.md` — API and architecture contract
-- `app/` — settings, models, store, checker, logging, and FastAPI routes
-- `tests/` — API and checker/security tests using mocked outbound HTTP
-- `docs/verification.md` — validation commands and expected evidence
-
-## Run locally
-
-```bash
-python -m venv .venv && . .venv/bin/activate
+```sh
+python -m venv .venv
+. .venv/bin/activate
 pip install -e '.[dev]'
 uvicorn app.main:app --reload
 ```
 
-Open `http://127.0.0.1:8000/docs`.
+OpenAPI is at `http://localhost:8000/docs`.
 
-## Examples
-
-```bash
-curl -sS -X POST http://127.0.0.1:8000/monitors \
+```sh
+curl -s -X POST http://localhost:8000/monitors \
   -H 'content-type: application/json' \
-  -d '{"name":"example","url":"https://example.com/"}'
-curl -sS http://127.0.0.1:8000/monitors
-curl -sS -X POST http://127.0.0.1:8000/monitors/MONITOR_ID/check
-curl -sS http://127.0.0.1:8000/monitors/MONITOR_ID/status
-curl -sS http://127.0.0.1:8000/healthz
-curl -sS http://127.0.0.1:8000/readyz
+  -d '{"name":"Example","url":"https://example.com","expected_status":200}'
+curl -s -X POST http://localhost:8000/monitors/UUID/check
+curl -s http://localhost:8000/monitors/UUID/status
 ```
 
-PUT accepts the same body as POST and replaces the mutable fields. DELETE returns 204. Unknown IDs return the JSON error envelope documented in the service contract.
+See `docs/service-contract.md` for routes, schemas, status semantics, error behavior, security,
+and architecture.
 
 ## Configuration
 
-All settings are validated at startup.
+All settings are validated at startup and use the `MONITOR_` prefix:
 
-| Variable | Default | Meaning |
+| Variable | Default | Constraint |
 |---|---:|---|
-| `MONITOR_REQUEST_TIMEOUT_SECONDS` | `5.0` | Total check timeout, range 0.1–30 |
-| `MONITOR_MAX_REDIRECTS` | `5` | Manual redirect limit, range 0–10 |
-| `MONITOR_MAX_MONITORS` | `1000` | Process-local monitor capacity |
-| `MONITOR_LOG_LEVEL` | `INFO` | Python log level |
-
-Private, loopback, link-local, multicast, reserved, and otherwise non-global resolved addresses are rejected. URL userinfo is rejected. Only HTTP and HTTPS are accepted.
+| `MONITOR_HOST` | `0.0.0.0` | bind host |
+| `MONITOR_PORT` | `8000` | 1..65535 |
+| `MONITOR_LOG_LEVEL` | `INFO` | logging level |
+| `MONITOR_CHECK_TIMEOUT_SECONDS` | `5` | >0, <=30 |
+| `MONITOR_MAX_REDIRECTS` | `3` | 0..10 |
 
 ## Quality checks
 
-```bash
+```sh
 ruff format --check .
 ruff check .
 mypy app
-pytest -q
+pytest
+./scripts/verify.sh
 ```
 
-## Container
+Tests use mocked HTTP transports and cover typed CRUD/error behavior, concurrent state changes,
+status persistence, timeout-safe checking, DNS/private-address blocking, redirect revalidation,
+and log redaction. No test sends outbound traffic.
 
-```bash
+## Containers
+
+```sh
 docker build -t endpoint-monitor .
 docker run --rm -p 8000:8000 endpoint-monitor
 # or
 docker compose up --build
 ```
 
-The container has a non-root user and one worker intentionally. State is process-local and is lost on restart; multiple workers/replicas do not share monitors. Use a durable shared database before horizontal scaling or production persistence is required.
+The image runs as an unprivileged user, uses one worker, and has a health check.
+
+## Important limitation
+
+Storage is deliberately process-local and ephemeral. Restarting loses every monitor. Multiple
+workers or replicas each have independent data and readiness only establishes that the local
+process can serve requests. Use one worker; add a shared database before scaling horizontally.