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package opium
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Source file app.ml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377open Import module Server = Httpaf_lwt_unix.Server module Reqd = Httpaf.Reqd open Lwt.Syntax let err_invalid_host host = Lwt.fail_invalid_arg ("Could not get host info for `" ^ host ^ "`") ;; let make_connection_handler ~host ~port ?middlewares handler = let* host_entry = Lwt.catch (fun () -> Lwt_unix.gethostbyname host) (function | Not_found -> err_invalid_host host | exn -> Lwt.fail exn) in let inet_addr = host_entry.h_addr_list.(0) in let listen_address = Unix.ADDR_INET (inet_addr, port) in let connection_handler addr fd = let f ~request_handler ~error_handler = Httpaf_lwt_unix.Server.create_connection_handler ~request_handler:(fun _ -> request_handler) ~error_handler:(fun _ -> error_handler) addr fd in let app = Rock.App.create ?middlewares ~handler () in Rock.Server_connection.run f app in Lwt.return (listen_address, connection_handler) ;; let run_unix ?backlog ?middlewares ~host ~port handler = let* listen_address, connection_handler = make_connection_handler ?middlewares ~host ~port handler in Lwt_io.establish_server_with_client_socket ?backlog listen_address connection_handler ;; let run_unix_multicore ?middlewares ~host ~port ~jobs handler = let listen_address, connection_handler = Lwt_main.run @@ make_connection_handler ?middlewares ~host ~port handler in let socket = Lwt_unix.socket (Unix.domain_of_sockaddr listen_address) Unix.SOCK_STREAM 0 in Lwt_unix.setsockopt socket Unix.SO_REUSEADDR true; Lwt_main.run (let+ () = Lwt_unix.bind socket listen_address in Lwt_unix.listen socket (Lwt_unix.somaxconn () [@ocaml.warning "-3"])); let rec accept_loop socket instance = let* socket', sockaddr' = Lwt_unix.accept socket in Lwt.async (fun () -> connection_handler sockaddr' socket'); accept_loop socket instance in for i = 1 to jobs do flush_all (); if Lwt_unix.fork () = 0 then ( Lwt.async (fun () -> accept_loop socket i); let forever, _ = Lwt.wait () in Lwt_main.run forever; exit 0) done; while true do Unix.pause () done ;; type t = { host : string ; port : int ; jobs : int ; backlog : int option ; debug : bool ; verbose : bool ; routes : (Httpaf.Method.t * Route.t * Rock.Handler.t) list ; middlewares : Rock.Middleware.t list ; name : string ; not_found : Rock.Handler.t } type builder = t -> t type route = string -> Rock.Handler.t -> builder let register app ~meth ~route ~action = { app with routes = (meth, route, action) :: app.routes } ;; let default_not_found _ = Lwt.return (Response.make ~status:`Not_found ~body:(Body.of_string "<html><body><h1>404 - Not found</h1></body></html>") ()) ;; let system_cores = match Sys.unix with | false -> (* TODO: detect number of cores on Windows *) 1 | true -> let ic = Unix.open_process_in "getconf _NPROCESSORS_ONLN" in let cores = int_of_string (input_line ic) in ignore (Unix.close_process_in ic); cores ;; let empty = { name = "Opium Default Name" ; host = "0.0.0.0" ; port = 3000 ; jobs = system_cores ; backlog = None ; debug = false ; verbose = false ; routes = [] ; middlewares = [] ; not_found = default_not_found } ;; let create_router routes = List.fold_left routes ~init:Middleware_router.empty ~f:(fun router (meth, route, action) -> Middleware_router.add router ~meth ~route ~action) ;; let attach_middleware { verbose; debug; routes; middlewares; _ } = [ Some (routes |> create_router |> Middleware_router.m) ] @ List.map ~f:Option.some middlewares @ [ (if verbose then Some Middleware_logger.m else None) ; (if debug then Some Middleware_debugger.m else None) ] |> List.filter_opt ;; let to_handler app = let middlewares = attach_middleware app in let filters = List.map ~f:(fun m -> m.Rock.Middleware.filter) middlewares in let service = Rock.Filter.apply_all filters app.not_found in service ;; let port port t = { t with port } let jobs jobs t = { t with jobs } let backlog backlog t = { t with backlog = Some backlog } let host host t = { t with host } let cmd_name name t = { t with name } let middleware m app = { app with middlewares = m :: app.middlewares } let action meth route action = register ~meth ~route:(Route.of_string route) ~action let not_found action t = let action req = let+ headers, body = action req in Response.make ~headers ~body ~status:`Not_found () in { t with not_found = action } ;; let get route action = register ~meth:`GET ~route:(Route.of_string route) ~action let post route action = register ~meth:`POST ~route:(Route.of_string route) ~action let delete route action = register ~meth:`DELETE ~route:(Route.of_string route) ~action let put route action = register ~meth:`PUT ~route:(Route.of_string route) ~action let patch route action = register ~meth:(`Other "PATCH") ~route:(Route.of_string route) ~action ;; let head route action = register ~meth:`HEAD ~route:(Route.of_string route) ~action let options route action = register ~meth:`OPTIONS ~route:(Route.of_string route) ~action let any methods route action t = if List.length methods = 0 then Logs.warn (fun f -> f "Warning: you're using [any] attempting to bind to '%s' but your list\n\ \ of http methods is empty route" route); let route = Route.of_string route in methods |> List.fold_left ~init:t ~f:(fun app meth -> app |> register ~meth ~route ~action) ;; let all = any [ `GET; `POST; `DELETE; `PUT; `HEAD; `OPTIONS ] let setup_logger app = if app.verbose then ( Logs.set_reporter (Logs_fmt.reporter ()); Logs.set_level (Some Logs.Info)); if app.debug then Logs.set_level (Some Logs.Debug) ;; let start app = (* We initialize the middlewares first, because the logger middleware initializes the logger. *) let middlewares = attach_middleware app in setup_logger app; Logs.info (fun f -> f "Starting Opium on %s:%d%s" app.host app.port (if app.debug then " (debug mode)" else "")); run_unix ?backlog:app.backlog ~middlewares ~host:app.host ~port:app.port app.not_found ;; let start_multicore app = (* We initialize the middlewares first, because the logger middleware initializes the logger. *) let middlewares = attach_middleware app in setup_logger app; Logs.info (fun f -> f "Starting Opium on %s:%d with %d cores%s" app.host app.port app.jobs (if app.debug then " (debug mode)" else "")); run_unix_multicore ~middlewares ~host:app.host ~port:app.port ~jobs:app.jobs app.not_found ;; let hashtbl_add_multi tbl x y = let l = try Hashtbl.find tbl x with | Not_found -> [] in Hashtbl.replace tbl x (y :: l) ;; let print_routes_f routes = let routes_tbl = Hashtbl.create 64 in routes |> List.iter ~f:(fun (meth, route, _) -> hashtbl_add_multi routes_tbl route meth); Printf.printf "%d Routes:\n" (Hashtbl.length routes_tbl); Hashtbl.iter (fun key data -> Printf.printf "> %s (%s)\n" (Route.to_string key) (data |> List.map ~f:(fun m -> Httpaf.Method.to_string m |> String.uppercase_ascii) |> String.concat ~sep:" ")) routes_tbl ;; let print_middleware_f middlewares = print_endline "Active middleware:"; middlewares |> List.map ~f:(fun m -> m.Rock.Middleware.name) |> List.iter ~f:(Printf.printf "> %s \n") ;; let setup_app app port jobs host print_routes print_middleware debug verbose _errors = let app = { app with debug; verbose; host; port; jobs } in if print_routes then ( let routes = app.routes in print_routes_f routes; exit 0); if print_middleware then ( let middlewares = app.middlewares in print_middleware_f middlewares; exit 0); app ;; module Cmds = struct open Cmdliner let routes = let doc = "print routes" in Arg.(value & flag & info [ "r"; "routes" ] ~doc) ;; let middleware = let doc = "print middleware stack" in Arg.(value & flag & info [ "m"; "middlware" ] ~doc) ;; let port default = let doc = "port" in Arg.(value & opt int default & info [ "p"; "port" ] ~doc) ;; let jobs default = let doc = "jobs" in Arg.(value & opt int default & info [ "j"; "jobs" ] ~doc) ;; let host default = let doc = "host" in Arg.(value & opt string default & info [ "h"; "host" ] ~doc) ;; let debug = let doc = "enable debug information" in Arg.(value & flag & info [ "d"; "debug" ] ~doc) ;; let verbose = let doc = "enable verbose mode" in Arg.(value & flag & info [ "v"; "verbose" ] ~doc) ;; let errors = let doc = "raise on errors. default is print" in Arg.(value & flag & info [ "f"; "fatal" ] ~doc) ;; let term = let open Cmdliner.Term in fun app -> pure setup_app $ pure app $ port app.port $ jobs app.jobs $ host app.host $ routes $ middleware $ debug $ verbose $ errors ;; let info name = let doc = Printf.sprintf "%s (Opium App)" name in let man = [] in Term.info name ~doc ~man ;; end let run_command' app = let open Cmdliner in let cmd = Cmds.term app in match Term.eval (cmd, Cmds.info app.name) with | `Ok a -> Lwt.async (fun () -> let* _server = start a in Lwt.return_unit); let forever, _ = Lwt.wait () in `Ok forever | `Error _ -> `Error | _ -> `Not_running ;; let run_command app = match app |> run_command' with | `Ok a -> Lwt.async (fun () -> let* _server = a in Lwt.return_unit); let forever, _ = Lwt.wait () in Lwt_main.run forever | `Error -> exit 1 | `Not_running -> exit 0 ;; let run_multicore app = let open Cmdliner in let cmd = Cmds.term app in match Term.eval (cmd, Cmds.info app.name) with | `Ok a -> start_multicore a | `Error _ -> exit 1 | _ -> exit 0 ;;