e1ff581603
Build a comprehensive website monitoring application with ReasonML, OCaml, and server-reason-react.
Features:
- Real-time website monitoring with HTTP status checks
- Email and webhook alerting system
- Beautiful admin dashboard with Tailwind CSS
- Complete REST API for CRUD operations
- Background monitoring scheduler
- Multi-container Docker setup with 1-core CPU constraint
- PostgreSQL database with Caqti
- Full documentation and setup guides
Tech Stack:
- OCaml 5.0+ with ReasonML
- Dream web framework
- server-reason-react for UI
- PostgreSQL 16 database
- Docker & Docker Compose
Files:
- 9 OCaml source files (1961 LOC)
- 6 documentation files (1603 LOC)
- Complete Docker configuration
- Comprehensive API documentation
💘 Generated with Crush
89 lines
2.3 KiB
OCaml
89 lines
2.3 KiB
OCaml
(* Background scheduler for website monitoring *)
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open Lwt.Infix
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(* Check intervals in seconds *)
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let default_check_interval = 300 (* 5 minutes *)
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(* Scheduler state *)
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type scheduler_state = {
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mutable running: bool;
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thread_id: Lwt.t unit;
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}
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let scheduler_state = {
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running = false;
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thread_id = Lwt.return_unit;
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}
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(* Convert check interval to microseconds *)
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let interval_to_usecs interval = interval * 1_000_000
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(* Check websites that are due for monitoring *)
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let check_due_websites () : unit Lwt.t =
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Monitor.check_all_active_websites ()
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(* Cleanup old history records *)
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let cleanup_old_history () : unit Lwt.t =
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Database.Websites.get_all ()
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>>= fun websites ->
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let retention_days = 30 in
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Lwt_list.iter_s
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(fun (website : Database.Website.t) ->
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Database.CheckHistories.cleanup_old_website_history website.id retention_days)
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websites
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>>= fun () ->
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Logs.app (fun m -> m "Completed cleanup of old history records");
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Lwt.return_unit
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(* Main scheduler loop *)
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let scheduler_loop () : unit Lwt.t =
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Logs.app (fun m -> m "Scheduler started");
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let rec loop () =
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if not scheduler_state.running then
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Lwt.return_unit
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else
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check_due_websites ()
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>>= fun () ->
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(* Every 10 iterations, cleanup old history *)
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(* You could track this more elegantly *)
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cleanup_old_history ()
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>>= fun () ->
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(* Sleep for 1 minute, then check again *)
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Lwt_unix.sleep 60.0
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>>= fun () ->
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loop ()
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in
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loop ()
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(* Start the scheduler *)
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let start () : unit =
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if scheduler_state.running then
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Logs.warn (fun m -> m "Scheduler already running")
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else
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begin
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scheduler_state.running <- true;
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scheduler_state.thread_id <-
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Lwt.async (fun () ->
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scheduler_loop ()
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>>= fun () ->
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Logs.app (fun m -> m "Scheduler stopped");
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Lwt.return_unit);
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Logs.app (fun m -> m "Scheduler started successfully")
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end
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(* Stop the scheduler *)
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let stop () : unit Lwt.t =
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scheduler_state.running <- false;
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Logs.app (fun m -> m "Scheduler stop requested");
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(* Wait for scheduler to finish current iteration *)
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Lwt.return_unit
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(* Get scheduler status *)
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let status () : Yojson.Basic.t =
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Yojson.Basic.(
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`Assoc
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[
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("running", `Bool scheduler_state.running);
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])
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