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| 1 | +module apps.api; |
| 2 | + |
| 3 | +import urt.array; |
| 4 | +import urt.format.json; |
| 5 | +import urt.lifetime; |
| 6 | +import urt.mem.allocator; |
| 7 | +import urt.mem.temp; |
| 8 | +import urt.string; |
| 9 | +import urt.time; |
| 10 | + |
| 11 | +import manager; |
| 12 | +import manager.base; |
| 13 | +import manager.collection; |
| 14 | +import manager.console; |
| 15 | +import manager.plugin; |
| 16 | + |
| 17 | +import protocol.http.message; |
| 18 | +import protocol.http.server; |
| 19 | + |
| 20 | +import router.stream; |
| 21 | + |
| 22 | +nothrow @nogc: |
| 23 | + |
| 24 | + |
| 25 | +class APIManager : BaseObject |
| 26 | +{ |
| 27 | + __gshared Property[2] Properties = [ Property.create!("http-server", http_server)(), |
| 28 | + Property.create!("uri", uri)() ]; |
| 29 | +nothrow @nogc: |
| 30 | + |
| 31 | + enum TypeName = StringLit!"api"; |
| 32 | + |
| 33 | + this(String name, ObjectFlags flags = ObjectFlags.None) |
| 34 | + { |
| 35 | + super(collection_type_info!APIManager, name.move, flags); |
| 36 | + } |
| 37 | + |
| 38 | + // Properties |
| 39 | + |
| 40 | + inout(HTTPServer) http_server() inout pure |
| 41 | + => _server; |
| 42 | + void http_server(HTTPServer value) |
| 43 | + { |
| 44 | + _server = value; |
| 45 | + } |
| 46 | + |
| 47 | + const(char)[] uri() const pure |
| 48 | + => _uri[]; |
| 49 | + void uri(const(char)[] value) |
| 50 | + { |
| 51 | + _uri = value.makeString(g_app.allocator); |
| 52 | + } |
| 53 | + |
| 54 | + // BaseObject overrides |
| 55 | + |
| 56 | + override bool validate() const pure |
| 57 | + => _server !is null; |
| 58 | + |
| 59 | + override CompletionStatus validating() |
| 60 | + { |
| 61 | + if (_server.detached) |
| 62 | + { |
| 63 | + import protocol.http; |
| 64 | + if (HTTPServer s = get_module!HTTPModule.servers.get(_server.name)) |
| 65 | + _server = s; |
| 66 | + } |
| 67 | + return super.validating(); |
| 68 | + } |
| 69 | + |
| 70 | + override CompletionStatus startup() |
| 71 | + { |
| 72 | + if (_uri) |
| 73 | + { |
| 74 | + _server.add_uri_handler(HTTPMethod.GET, _uri, &handle_request); |
| 75 | + _server.add_uri_handler(HTTPMethod.POST, _uri, &handle_request); |
| 76 | + _server.add_uri_handler(HTTPMethod.OPTIONS, _uri, &handle_request); |
| 77 | + } |
| 78 | + else |
| 79 | + _default_handler = _server.hook_global_handler(&handle_request); |
| 80 | + |
| 81 | + return CompletionStatus.Complete; |
| 82 | + } |
| 83 | + |
| 84 | + override CompletionStatus shutdown() |
| 85 | + { |
| 86 | + // TODO: need to unlink these things... |
| 87 | + return CompletionStatus.Complete; |
| 88 | + } |
| 89 | + |
| 90 | + override void update() |
| 91 | + { |
| 92 | + update_pending_requests(); |
| 93 | + } |
| 94 | + |
| 95 | +private: |
| 96 | + ObjectRef!HTTPServer _server; |
| 97 | + String _uri; |
| 98 | + |
| 99 | + HTTPServer.RequestHandler _default_handler; |
| 100 | + |
| 101 | + struct PendingRequest |
| 102 | + { |
| 103 | + HTTPVersion ver; |
| 104 | + Stream stream; |
| 105 | + StringSession session; |
| 106 | + CommandState command; |
| 107 | + } |
| 108 | + Array!PendingRequest _pending_requests; |
| 109 | + |
| 110 | + int handle_request(ref const HTTPMessage request, ref Stream stream) |
| 111 | + { |
| 112 | + const(char)[] tail = request.request_target[_uri.length .. $]; |
| 113 | + |
| 114 | + // Handle CORS preflight OPTIONS requests |
| 115 | + if (request.method == HTTPMethod.OPTIONS) |
| 116 | + return handle_options(request, stream); |
| 117 | + |
| 118 | + if (tail == "/health") |
| 119 | + return handle_health(request, stream); |
| 120 | + if (tail == "/cli/execute") |
| 121 | + return handle_cli_execute(request, stream); |
| 122 | + |
| 123 | + if (_default_handler) |
| 124 | + _default_handler(request, stream); |
| 125 | + else if (_uri) |
| 126 | + { |
| 127 | + HTTPMessage response = create_response(request.http_version, 404, StringLit!"Not Found", StringLit!"application/json", "{\"error\":\"Not Found\"}"); |
| 128 | + stream.write(response.format_message()[]); |
| 129 | + } |
| 130 | + |
| 131 | + return 0; |
| 132 | + } |
| 133 | + |
| 134 | + void add_cors_headers(ref HTTPMessage response) |
| 135 | + { |
| 136 | + response.headers ~= HTTPParam(StringLit!"Access-Control-Allow-Origin", StringLit!"*"); |
| 137 | + response.headers ~= HTTPParam(StringLit!"Access-Control-Allow-Methods", StringLit!"GET, POST, PUT, DELETE, OPTIONS"); |
| 138 | + response.headers ~= HTTPParam(StringLit!"Access-Control-Allow-Headers", StringLit!"Content-Type"); |
| 139 | + } |
| 140 | + |
| 141 | + int handle_options(ref const HTTPMessage request, ref Stream stream) |
| 142 | + { |
| 143 | + HTTPMessage response = create_response(request.http_version, 204, StringLit!"No Content", String(), null); |
| 144 | + add_cors_headers(response); |
| 145 | + stream.write(response.format_message()[]); |
| 146 | + return 0; |
| 147 | + } |
| 148 | + |
| 149 | + int handle_health(ref const HTTPMessage request, ref Stream stream) |
| 150 | + { |
| 151 | + HTTPMessage response = create_response(request.http_version, 200, StringLit!"OK", StringLit!"application/json", tconcat("{\"status\":\"healthy\",\"uptime\":", getAppTime().as!"seconds", "}")); |
| 152 | + add_cors_headers(response); |
| 153 | + stream.write(response.format_message()[]); |
| 154 | + return 0; |
| 155 | + } |
| 156 | + |
| 157 | + int handle_cli_execute(ref const HTTPMessage request, ref Stream stream) |
| 158 | + { |
| 159 | + const(char)[] command_text; |
| 160 | + if (request.method == HTTPMethod.GET) |
| 161 | + { |
| 162 | + command_text = request.param("command")[]; |
| 163 | + } |
| 164 | + else |
| 165 | + { |
| 166 | + Variant json = parse_json(cast(char[])request.content[]); |
| 167 | + command_text = json.getMember("command").asString(); |
| 168 | + } |
| 169 | + |
| 170 | + if (command_text.length == 0) |
| 171 | + { |
| 172 | + HTTPMessage response = create_response(request.http_version, 400, StringLit!"Bad Request", StringLit!"application/json", "{\"error\":\"Command body required\"}"); |
| 173 | + add_cors_headers(response); |
| 174 | + stream.write(response.format_message()[]); |
| 175 | + return 0; |
| 176 | + } |
| 177 | + |
| 178 | + StringSession session = g_app.console.createSession!StringSession(); |
| 179 | + CommandState cmd = g_app.console.execute(session, command_text); |
| 180 | + if (cmd is null) |
| 181 | + { |
| 182 | + MutableString!0 output = session.takeOutput(); |
| 183 | + send_cli_response(request.http_version, stream, output[]); |
| 184 | + defaultAllocator().freeT(session); |
| 185 | + return 0; |
| 186 | + } |
| 187 | + |
| 188 | + // TODO: if it's a persistent seession; we need a reference to the session to produce a response. |
| 189 | + // if it's an ephemeral session, we need to take the stream from the session so we can produce a deferred response...? |
| 190 | + assert(false, "TODO: TEST THIS PATH, I'M NOT SURE THE HTTP REQUEST HANDLER CAN HANDLE HANDLE RELAYED RESPONSE?"); |
| 191 | + _pending_requests ~= PendingRequest(request.http_version, stream, session, cmd); |
| 192 | + return 0; |
| 193 | + } |
| 194 | + |
| 195 | + void send_cli_response(HTTPVersion http_version, ref Stream stream, const(char)[] output) |
| 196 | + { |
| 197 | + HTTPMessage response = create_response(http_version, 200, StringLit!"OK", StringLit!"application/json", "{\"output\":"); |
| 198 | + if (output.length > 0) |
| 199 | + { |
| 200 | + import urt.format.json; |
| 201 | + |
| 202 | + const v = Variant(output); |
| 203 | + size_t bytes = v.write_json(null); |
| 204 | + auto buf = cast(char[])talloc(bytes); |
| 205 | + v.write_json(buf); |
| 206 | + response.content ~= buf[]; |
| 207 | + response.content ~= "}"; |
| 208 | + } |
| 209 | + else |
| 210 | + response.content ~= "\"\"}"; |
| 211 | + add_cors_headers(response); |
| 212 | + stream.write(response.format_message()[]); |
| 213 | + } |
| 214 | + |
| 215 | + void update_pending_requests() |
| 216 | + { |
| 217 | + size_t i = 0; |
| 218 | + while (i < _pending_requests.length) |
| 219 | + { |
| 220 | + ref PendingRequest req = _pending_requests[i]; |
| 221 | + |
| 222 | + if (req.command.update() == CommandCompletionState.InProgress) |
| 223 | + { |
| 224 | + ++i; |
| 225 | + continue; |
| 226 | + } |
| 227 | + |
| 228 | + MutableString!0 output = req.session.takeOutput(); |
| 229 | + send_cli_response(req.ver, req.stream, output[]); |
| 230 | + |
| 231 | + defaultAllocator().freeT(req.session); |
| 232 | + _pending_requests.remove(i); |
| 233 | + } |
| 234 | + } |
| 235 | +} |
| 236 | + |
| 237 | + |
| 238 | +class APIModule : Module |
| 239 | +{ |
| 240 | + mixin DeclareModule!"apps.api"; |
| 241 | +nothrow @nogc: |
| 242 | + |
| 243 | + Collection!APIManager managers; |
| 244 | + |
| 245 | + override void init() |
| 246 | + { |
| 247 | + g_app.console.registerCollection("/apps/api", managers); |
| 248 | + } |
| 249 | + |
| 250 | + override void update() |
| 251 | + { |
| 252 | + managers.update_all(); |
| 253 | + } |
| 254 | +} |
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