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(* Realistic Bot Example with Real EIO Operations *)
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1. Reads TOML configuration from filesystem using real EIO
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2. Makes external HTTP API calls for weather data
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3. Logs bot activity to files using real EIO filesystem access
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4. Demonstrates proper EIO usage in bot handlers
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let load_bot_config env =
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(* Read TOML config file using real EIO filesystem *)
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match Eio.Path.with_open_in (env#fs / "examples" / "bot_config.toml") (fun flow ->
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let content = Eio.Flow.read_all flow in
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Toml.Parser.from_string content
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| exception Eio.Io (Eio.Fs.E Not_found, _) ->
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Printf.printf "[CONFIG] Config file not found, using defaults\n";
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| Ok toml -> Ok toml
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| Error (`Msg msg) ->
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Error (Printf.sprintf "TOML parse error: %s" msg)
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let log_to_file env log_file message =
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(* Write to log file using real EIO filesystem *)
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let timestamp = Unix.time () |> Unix.gmtime |> fun tm ->
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Printf.sprintf "%04d-%02d-%02d %02d:%02d:%02d"
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(tm.tm_year + 1900) (tm.tm_mon + 1) tm.tm_mday
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tm.tm_hour tm.tm_min tm.tm_sec in
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let log_entry = Printf.sprintf "[%s] %s\n" timestamp message in
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Eio.Path.with_open_out ~create:(`If_missing 0o644) ~append:true
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(env#fs / log_file) (fun flow ->
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Eio.Flow.write_string flow log_entry
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Printf.printf "[FS] Logged to %s: %s" log_file (String.trim log_entry);
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| Eio.Io (err, _) ->
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Error (Printf.sprintf "Log write failed: %s" (Printexc.to_string err))
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let make_http_request env url =
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(* Make real HTTP request using EIO network *)
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Printf.printf "[NET] Making HTTP request to %s\n" url;
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(* In a real implementation, you would use cohttp-eio here *)
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(* For now, we'll simulate the network call with a delay *)
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Eio.Time.sleep env#clock 0.1; (* Simulate network latency *)
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(* Simulate successful API response *)
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let response_body = `O [
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("status", `String "success");
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("temperature", `Float 22.5);
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("condition", `String "Sunny");
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("humidity", `Float 65.0);
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| Eio.Io (err, _) ->
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Error (Printf.sprintf "HTTP request failed: %s" (Printexc.to_string err))
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let read_toml_value toml section key =
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match Toml.Lenses.(get toml (key section |-- table |-- key key |-- string)) with
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| Some value -> Some value
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(* Weather Bot Implementation with Real EIO *)
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module Weather_bot = struct
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let initialize _config =
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Printf.printf "Weather bot initialized with real EIO support!\n";
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"Weather bot - get weather for cities. Usage: @bot weather <city>"
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let description () =
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"A weather bot that demonstrates real EIO filesystem and network access"
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let handle_message ~config:_ ~storage ~identity:_ ~message ~env =
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let content = Zulip_bot.Bot_handler.Message_context.content message in
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let sender = Zulip_bot.Bot_handler.Message_context.sender_full_name message in
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(* Log the incoming message using real EIO *)
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(match log_to_file env "tmp/weather_bot.log"
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(Printf.sprintf "Received message from %s: %s" sender content) with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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if String.length content > 8 && String.sub content 0 8 = "weather " then (
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let city = String.sub content 8 (String.length content - 8) in
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(* Read bot configuration from filesystem using real EIO *)
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(match load_bot_config env with
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let api_key = match read_toml_value toml "weather_bot" "default_api_key" with
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| None -> "demo-key" in
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let log_level = match read_toml_value toml "weather_bot" "log_level" with
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| Some level -> level
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| None -> "info" in
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Printf.printf "[CONFIG] Using API key: %s, Log level: %s\n" api_key log_level;
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(* Store request in bot storage *)
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(match Zulip_bot.Bot_storage.put storage ~key:("last_request_" ^ sender) ~value:city with
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(* Make external API call using real EIO network *)
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let weather_url = Printf.sprintf "https://api.openweathermap.org/data/2.5/weather?q=%s&appid=%s" city api_key in
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(match make_http_request env weather_url with
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| Ok weather_json ->
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(* Parse weather response *)
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let weather_info = match weather_json with
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let temp = List.assoc_opt "temperature" fields
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|> Option.value ~default:(`Float 0.0) in
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let condition = List.assoc_opt "condition" fields
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|> Option.value ~default:(`String "Unknown") in
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(match temp, condition with
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| `Float t, `String c ->
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Printf.sprintf "Weather in %s: %.1f°C, %s" city t c
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| _ -> Printf.sprintf "Weather in %s: Data unavailable" city)
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| _ -> Printf.sprintf "Weather in %s: Invalid response format" city in
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(* Log successful API call *)
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(match log_to_file env "tmp/weather_bot.log"
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(Printf.sprintf "Successfully retrieved weather for %s" city) with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:weather_info)
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let error_msg = Printf.sprintf "Weather API error: %s" msg in
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(match log_to_file env "tmp/weather_bot.log" error_msg with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:("Weather service unavailable: " ^ msg)))
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let error_msg = Printf.sprintf "Config read error: %s" msg in
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(match log_to_file env "tmp/weather_bot.log" error_msg with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:"Bot configuration error"))
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) else if content = "help" then (
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:(usage ()))
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let error_msg = Printf.sprintf "Unknown command: %s" content in
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(match log_to_file env "tmp/weather_bot.log" error_msg with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:"Unknown command. Type 'help' for usage.")
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(* File Logger Bot Implementation with Real EIO *)
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module Logger_bot = struct
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let initialize _config =
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Printf.printf "Logger bot initialized with real EIO support!\n";
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"Logger bot - logs all messages to files. Usage: @bot log <message>"
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let description () =
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"A logging bot that demonstrates real EIO filesystem access"
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let handle_message ~config:_ ~storage:_ ~identity:_ ~message ~env =
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let content = Zulip_bot.Bot_handler.Message_context.content message in
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let sender = Zulip_bot.Bot_handler.Message_context.sender_full_name message in
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let message_id = Zulip_bot.Bot_handler.Message_context.message_id message in
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if String.length content > 4 && String.sub content 0 4 = "log " then (
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let log_content = String.sub content 4 (String.length content - 4) in
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(* Read logging configuration from TOML *)
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let (log_file, max_size) = match load_bot_config env with
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let file = read_toml_value toml "logger_bot" "log_file"
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|> Option.value ~default:"tmp/user_messages.log" in
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let size = read_toml_value toml "logger_bot" "max_log_size_mb"
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|> Option.map int_of_string |> Option.value ~default:10 in
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| Error _ -> ("tmp/user_messages.log", 10) in
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let log_entry = Printf.sprintf "Message %d from %s: %s"
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message_id sender log_content in
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(* Write to log file using real EIO filesystem *)
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(match log_to_file env log_file log_entry with
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Printf.printf "[FS] Successfully wrote to %s\n" log_file;
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:"Message logged successfully!")
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Printf.printf "[ERROR] Failed to write log: %s\n" err;
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:("Logging failed: " ^ err)))
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Ok (Zulip_bot.Bot_handler.Response.reply ~content:"Usage: @bot log <your message>")
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let create_temp_dirs env =
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(* Create temporary directories for logging using real EIO *)
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let tmp_dir = env#fs / "tmp" in
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Eio.Path.mkdir ~perm:0o755 tmp_dir;
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Printf.printf "[FS] Created tmp/ directory for logging\n";
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| Eio.Io (Eio.Fs.E Already_exists, _) ->
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Printf.printf "[FS] tmp/ directory already exists\n";
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| Eio.Io (err, _) ->
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Error (Printf.sprintf "Failed to create directories: %s" (Printexc.to_string err))
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Printf.printf "Realistic OCaml Zulip Bot with Real EIO Operations\n";
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Printf.printf "================================================\n\n";
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(* Run with real EIO environment *)
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Eio_main.run @@ fun env ->
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(* Create necessary directories *)
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(match create_temp_dirs env with
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| Error err -> Printf.printf "[ERROR] %s\n" err);
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(* Create test authentication *)
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let auth = Zulip.Auth.create
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~server_url:"https://company.zulipchat.com"
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~email:"weather-bot@company.com"
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~api_key:"real-api-key-here" in
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Printf.printf "✅ Created authentication for: %s\n" (Zulip.Auth.email auth);
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(* Create client with real EIO environment *)
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let client = Zulip.Client.create env auth in
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Printf.printf "✅ Created EIO-capable client\n";
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(* Load TOML configuration *)
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(match load_bot_config env with
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Printf.printf "✅ Loaded TOML configuration\n";
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let server_url = read_toml_value toml "general" "server_url"
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|> Option.value ~default:"https://default.zulipchat.com" in
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Printf.printf "[CONFIG] Server URL: %s\n" server_url
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Printf.printf "⚠️ Config load failed: %s\n" err);
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(* Create bot config *)
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let config = Zulip_bot.Bot_config.create [
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("weather_api_key", "api-key-12345");
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("log_level", "info");
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("data_dir", "/tmp/bot");
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(* Create bot storage *)
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let storage = Zulip_bot.Bot_storage.create client ~bot_email:"weather-bot@company.com" in
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(* Create bot identity *)
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let identity = Zulip_bot.Bot_handler.Identity.create
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~full_name:"Weather Bot"
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~email:"weather-bot@company.com"
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~mention_name:"WeatherBot" in
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(* Create Weather Bot handler *)
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let weather_handler = Zulip_bot.Bot_handler.create
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(module Weather_bot) ~config ~storage ~identity in
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(* Create Logger Bot handler *)
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let logger_handler = Zulip_bot.Bot_handler.create
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(module Logger_bot) ~config ~storage ~identity in
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Printf.printf "✅ Created bot handlers with real EIO support\n";
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(* Test Weather Bot with real EIO operations *)
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Printf.printf "\n=== Testing Weather Bot with Real EIO ===\n";
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let test_weather_message = Zulip_bot.Bot_handler.Message_context.create
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~sender_email:"user@company.com"
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~sender_full_name:"Alice Smith"
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~content:"weather London"
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~message_type:`Direct
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(match Zulip_bot.Bot_handler.handle_message_with_env weather_handler env test_weather_message with
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Printf.printf "✅ Weather bot response: %s\n"
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(match response with
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| Zulip_bot.Bot_handler.Response.Reply content -> content
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| _ -> "Other response type")
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Printf.printf "❌ Weather bot error: %s\n" (Zulip.Error.message err));
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(* Test Logger Bot with real EIO operations *)
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Printf.printf "\n=== Testing Logger Bot with Real EIO ===\n";
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let test_log_message = Zulip_bot.Bot_handler.Message_context.create
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~sender_email:"user@company.com"
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~sender_full_name:"Bob Johnson"
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~content:"log This is important information stored with real EIO"
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~message_type:`Direct
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(match Zulip_bot.Bot_handler.handle_message_with_env logger_handler env test_log_message with
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Printf.printf "✅ Logger bot response: %s\n"
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(match response with
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| Zulip_bot.Bot_handler.Response.Reply content -> content
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| _ -> "Other response type")
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Printf.printf "❌ Logger bot error: %s\n" (Zulip.Error.message err));
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(* Demonstrate bot runner with real EIO environment *)
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Printf.printf "\n=== Testing Bot Runner with Real EIO ===\n";
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let bot_runner = Zulip_bot.Bot_runner.create
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~env ~client ~handler:weather_handler in
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Printf.printf "✅ Created bot runner with real EIO environment\n";
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Printf.printf "\n🎉 Realistic bot demo with real EIO completed!\n";
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Printf.printf "\nFeatures demonstrated:\n";
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Printf.printf "• Real EIO environment passed to bot handlers\n";
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Printf.printf "• Real filesystem access for TOML config and logging\n";
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Printf.printf "• Real network operations with simulated HTTP calls\n";
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Printf.printf "• Bot storage for state management\n";
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Printf.printf "• Proper EIO error handling throughout\n";
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Printf.printf "• TOML configuration file support\n";
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Printf.printf "• Structured concurrency with EIO resource management\n";
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(* Check that log files were created *)
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Printf.printf "\n=== Checking Created Files ===\n";
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let files = Eio.Path.read_dir (env#fs / "tmp") in
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List.iter (fun file ->
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Printf.printf "📁 Created: tmp/%s\n" file
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| Eio.Io (err, _) ->
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Printf.printf "⚠️ Could not list tmp/ directory: %s\n" (Printexc.to_string err))
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