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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512
use std::collections::{HashMap, HashSet}; use std::fmt; use std::str::FromStr; use bytes::{BufMut, BytesMut}; use crate::err::Error; use crate::params::Params; use crate::validators::validate_topic; /// Representation of a Telegram; a buffer which contains a _topic_ and a set /// of key/value parameters. #[derive(Debug, Clone, Default)] pub struct Telegram { topic: Option<String>, params: Params } impl Telegram { /// Create a new telegram object, with an unset topic. /// /// Note that a telegram object without a topic is invalid. /// [`set_topic()`](Self::set_topic) must /// be called to set a topic to make the object valid. Use /// [`new_topic()`](Self::new_topic) to /// create a new Telegram object with a topic. pub fn new() -> Self { Telegram { ..Default::default() } } /// Create a new telegram object with a topic. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new_topic("Hello").unwrap(); /// assert_eq!(tg.get_topic(), Some("Hello")); /// } /// ``` pub fn new_topic(topic: &str) -> Result<Self, Error> { validate_topic(topic)?; Ok(Telegram { topic: Some(topic.to_string()), ..Default::default() }) } /// Clear topic and internal parameters buffer. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_param("cat", "meow"); /// assert_eq!(tg.num_params(), 1); /// tg.clear(); /// assert_eq!(tg.num_params(), 0); /// } /// ``` pub fn clear(&mut self) { self.topic = None; self.params.clear(); } /// Return the number of key/value parameters in the Telegram object. /// /// # Examples /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// assert_eq!(tg.num_params(), 0); /// tg.add_param("cat", "meow"); /// assert_eq!(tg.num_params(), 1); /// } /// ``` /// /// # Notes /// This is a wrapper around [`Params::len()`](crate::Params::len). pub fn num_params(&self) -> usize { self.params.len() } /// Get a reference to the internal parameters object. pub fn get_params(&self) -> &Params { &self.params } /// Get a mutable reference to the inner [`Params`](crate::Params) object. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_param("cat", "meow"); /// assert_eq!(tg.num_params(), 1); /// tg.get_params_mut().clear(); /// assert_eq!(tg.num_params(), 0); /// } /// ``` pub fn get_params_mut(&mut self) -> &mut Params { &mut self.params } /// Get a reference the the parameter's internal HashMap. /// /// Note: The inner representation of the Params object may change in the /// future. pub fn get_params_inner(&self) -> &HashMap<String, String> { &self.params.get_inner() } /// Set topic for telegram. /// /// Overwrites current topic is one has already been set. /// /// # Examples /// ``` /// use blather::{Telegram, Error}; /// fn main() { /// let mut tg = Telegram::new(); /// assert_eq!(tg.set_topic("Hello"), Ok(())); /// /// let e = Error::BadFormat("Invalid topic character".to_string()); /// assert_eq!(tg.set_topic("Hell o"), Err(e)); /// } /// ``` pub fn set_topic(&mut self, topic: &str) -> Result<(), Error> { validate_topic(topic)?; self.topic = Some(topic.to_string()); Ok(()) } /// Get a reference to the topic string, or None if topic is not been set. /// /// # Examples /// ``` /// use blather::{Telegram, Error}; /// fn main() { /// let tg = Telegram::new_topic("shoe0nhead").unwrap(); /// assert_eq!(tg.get_topic(), Some("shoe0nhead")); /// /// let tg = Telegram::new(); /// assert_eq!(tg.get_topic(), None); /// } /// ``` pub fn get_topic(&self) -> Option<&str> { if let Some(t) = &self.topic { Some(t) } else { None } } /// Add a parameter to the telegram. /// /// The `key` and `value` parameters are generic over the trait `ToString`, /// allowing a polymorphic behavior. /// /// # Examples /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_param("integer", 42).unwrap(); /// tg.add_param("string", "hello").unwrap(); /// } /// ``` /// /// # Notes /// - This is a thin wrapper around /// [`Params::add_param()`](crate::Params::add_param). pub fn add_param<T: ToString, U: ToString>( &mut self, key: T, value: U ) -> Result<(), Error> { self.params.add_param(key, value) } /// Add a string parameter to the telegram. /// /// # Notes /// - This function exists primarily for parity with a C++ library; it is /// just a wrapper around [`add_param()`](Self::add_param), which is /// recommended over `add_str()`. pub fn add_str(&mut self, key: &str, value: &str) -> Result<(), Error> { self.add_param(key, value) } /// Add parameter where the value is generated from an iterator over a /// string container, where entries will be comma-separated. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_strit("Cat", &["meow", "paws", "tail"]).unwrap(); /// assert_eq!(tg.get_str("Cat"), Some("meow,paws,tail")); /// } /// ``` /// /// # Notes /// - This is a thin wrapper for /// [`Params::add_strit()`](crate::Params::add_strit). pub fn add_strit<I, S>(&mut self, key: &str, c: I) -> Result<(), Error> where I: IntoIterator<Item = S>, S: AsRef<str> { self.params.add_strit(key, c) } /// Add a boolean value to Telegram object. /// /// # Notes /// - This is a thin wrapper around /// [`Params::add_bool()`](crate::Params::add_bool). pub fn add_bool<K: ToString>( &mut self, key: K, value: bool ) -> Result<(), Error> { self.params.add_bool(key, value) } /// Check whether a parameter exists in Telegram object. /// /// Returns `true` is the key exists, and `false` otherwise. pub fn have_param(&self, key: &str) -> bool { self.params.have(key) } /// Get a parameter. Fail if the parameter does not exist. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_param()`](crate::Params::get_param). pub fn get_param<T: FromStr>(&self, key: &str) -> Result<T, Error> { self.params.get_param(key) } /// Get a parameter. Return a default value if the parameter does not /// exist. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_param_def()`](crate::Params::get_param_def). pub fn get_param_def<T: FromStr>( &self, key: &str, def: T ) -> Result<T, Error> { self.params.get_param_def(key, def) } /// Get a string representation of a parameter. Return `None` is parameter /// does not exist. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_str()`](crate::Params::get_str) pub fn get_str(&self, key: &str) -> Option<&str> { self.params.get_str(key) } /// Get a string representation of a parameter. Returns a default value is /// the parameter does not exist. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_str_def()`](crate::Params::get_str_def) pub fn get_str_def<'a>(&'a self, key: &str, def: &'a str) -> &'a str { self.params.get_str_def(key, def) } /// Get an integer representation of a parameter. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_param("Num", 7); /// assert_eq!(tg.get_int::<usize>("Num").unwrap(), 7); /// } /// ``` /// /// # Notes /// - This function uses the `FromStr` trait on the return-type so it /// technically isn't limited to integers. /// - The method exists to mimic a C++ library. It is recommeded that /// applications use [`Telegram::get_param()`](Self::get_param) instead. pub fn get_int<T: FromStr>(&self, key: &str) -> Result<T, Error> { self.params.get_int(key) } /// Try to get the parameter value of a key and interpret it as an integer. /// If the key does not exist then return a default value supplied by the /// caller. /// /// ``` /// use blather::Telegram; /// fn main() { /// let mut tg = Telegram::new(); /// tg.add_param("num", 11); /// assert_eq!(tg.get_int_def::<u32>("num", 5).unwrap(), 11); /// assert_eq!(tg.get_int_def::<u32>("nonexistent", 17).unwrap(), 17); /// } /// ``` pub fn get_int_def<T: FromStr>( &self, key: &str, def: T ) -> Result<T, Error> { self.params.get_int_def(key, def) } /// Return a boolean value. Return error if parameter does not exist. /// /// If a value exist but can not be parsed as a boolean value the error /// `Error::BadFormat` will be returned. /// /// # Notes /// - This is a thing wrapper around /// [`Params::get_bool()`](crate::Params::get_bool). pub fn get_bool(&self, key: &str) -> Result<bool, Error> { self.params.get_bool(key) } /// Return a boolean value. Return a default value if parameter does not /// exist. /// /// # Notes /// - This is a thing wrapper around /// [`Params::get_bool()`](crate::Params::get_bool). pub fn get_bool_def(&self, key: &str, def: bool) -> Result<bool, Error> { self.params.get_bool_def(key, def) } /// Parse the value of a key as a comma-separated list of strings and return /// it as a `Vec<String>`. Only non-empty entries are returned. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_strvec()`](crate::Params::get_strvec). pub fn get_strvec(&self, key: &str) -> Result<Vec<String>, Error> { self.params.get_strvec(key) } /// Parse the value of a key as a comma-separated list of strings and return /// it as a `HashSet<String>`. Only non-empty entries are returned. /// /// # Notes /// - This is a thin wrapper around /// [`Params::get_hashset()`](crate::Params::get_hashset). pub fn get_hashset(&self, key: &str) -> Result<HashSet<String>, Error> { self.params.get_hashset(key) } /// Calculate the size of a serialized version of this Telegram object. /// If no topic has been set it is simply ignored. In the future this might /// change to something more dramatic, like a panic. Telegrams should always /// contain a topic when transmitted. /// /// Each line is terminated by a newline character. /// The last line consists of a single newline character. pub fn calc_buf_size(&self) -> usize { // Calculate the required buffer size let mut size = 0; if let Some(ref h) = self.topic { size += h.len() + 1; // including '\n' } // Note that the Params method reserves the final terminating newline. size + self.params.calc_buf_size() } pub fn serialize(&self) -> Result<Vec<u8>, Error> { let mut buf = Vec::new(); if let Some(ref h) = self.topic { // Copy topic let b = h.as_bytes(); for a in b { buf.push(*a); } buf.push(b'\n'); } else { return Err(Error::BadFormat("Missing heading".to_string())); } for (key, value) in self.get_params_inner() { let k = key.as_bytes(); let v = value.as_bytes(); for a in k { buf.push(*a); } buf.push(b' '); for a in v { buf.push(*a); } buf.push(b'\n'); } buf.push(b'\n'); Ok(buf) } /// Write the Telegram to a BytesMut buffer. pub fn encoder_write(&self, buf: &mut BytesMut) -> Result<(), Error> { if self.topic.is_none() { return Err(Error::SerializeError("Missing Telegram topic".to_string())); } // Calculate the required buffer size let size = self.calc_buf_size(); // Reserve space buf.reserve(size); // Write data to output buffer if let Some(ref b) = self.topic { buf.put(b.as_bytes()); } buf.put_u8(b'\n'); for (key, value) in self.get_params_inner() { buf.put(key.as_bytes()); buf.put_u8(b' '); buf.put(value.as_bytes()); buf.put_u8(b'\n'); } buf.put_u8(b'\n'); Ok(()) } /// Consume the Telegram buffer and return the internal parameters object. pub fn into_params(self) -> Params { self.params } } impl From<String> for Telegram { fn from(topic: String) -> Self { Telegram { topic: Some(topic), ..Default::default() } } } impl From<Params> for Telegram { fn from(params: Params) -> Self { Telegram { params, ..Default::default() } } } impl From<HashMap<String, String>> for Telegram { fn from(hm: HashMap<String, String>) -> Self { Telegram { params: Params::from(hm), ..Default::default() } } } impl fmt::Display for Telegram { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let topic: &str = match &self.topic { Some(s) => s.as_ref(), None => &"<None>" }; write!(f, "{}:{}", topic, self.params) } } // vim: set ft=rust et sw=2 ts=2 sts=2 cinoptions=2 tw=79 :