Implement /getMe (core/mod.rs)

Cargo.toml

@@ -6,3 +6,8 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+futures-preview = { version = "0.3.0-alpha.14", features = ["compat"] }
+reqwest = "0.9.20"
+serde_json = "1.0.39"
+serde = {version = "1.0.92", features = ["derive"] }
+lazy_static = "1.3"

src/core/mod.rs

@@ -0,0 +1,64 @@
+use futures::compat::Future01CompatExt;
+use reqwest::r#async::Client;
+use reqwest::StatusCode;
+use serde::Deserialize;
+use serde_json::Value;
+
+lazy_static! {
+    static ref REQWEST_CLIENT: Client = Client::new();
+}
+
+const TELEGRAM_URL_START: &str = "https://api.telegram.org/bot";
+
+#[derive(Debug)]
+pub enum Error {
+    Api {
+        status_code: StatusCode,
+        description: Option<String>,
+    },
+    Send(reqwest::Error),
+    InvalidJson(reqwest::Error),
+}
+
+pub type Response<T> = Result<T, Error>;
+
+#[derive(Debug, Deserialize)]
+pub struct User {
+    id: i64,
+    is_bot: bool,
+    first_name: String,
+    last_name: Option<String>,
+    username: Option<String>,
+    language_code: Option<String>,
+}
+
+pub async fn get_me(bot_token: &str) -> Response<User> {
+    let mut response = REQWEST_CLIENT
+        .get(&format!(
+            "{}{bot_token}/getMe",
+            TELEGRAM_URL_START,
+            bot_token = bot_token
+        ))
+        .send()
+        .compat()
+        .await
+        .map_err(Error::Send)?;
+
+    let response_json = response
+        .json::<Value>()
+        .compat()
+        .await
+        .map_err(Error::InvalidJson)?;
+
+    if response_json["ok"] == "false" {
+        return Err(Error::Api {
+            status_code: response.status(),
+            description: match response_json.get("description") {
+                None => None,
+                Some(description) => Some(description.to_string()),
+            },
+        });
+    }
+
+    Ok(serde_json::from_value(response_json["result"].clone()).unwrap())
+}

src/lib.rs

@@ -1,7 +1,6 @@
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
-    }
-}
+#![feature(async_await)]
+
+#[macro_use]
+extern crate lazy_static;
+
+mod core;