Implemented Warehouse Pypi API Call

- Added log 0.4 Crate
- Added serde 1.0 Crate
- Added serde_json 1.0 Crate
- Created pypi.rs
- Created request_package_info function
- Created PypiData struct
- Added request_package_info example to main.rs

Cargo.toml

@@ -16,6 +16,9 @@ reqwest = { version = "0.11", features = ["blocking", "json"] }
 structopt = { version = "0.3.26", features = ["color"] }
 strum = "0.24.1"
 strum_macros = "0.24.2"
+log = "0.4"
+serde = {version = "1", features = ["derive"]}
+serde_json = "1.0"
 
 
 [dev-dependencies]

src/main.rs

@@ -1,5 +1,9 @@
 use std::path::PathBuf;
 use structopt::StructOpt;
+use anyhow::Result;
+
+mod pypi;
+use pypi::{request_package_info, PypiData};
 
 /// A basic example
 #[derive(StructOpt, Debug)]
@@ -44,7 +48,16 @@ enum Opt {
     Help {},
 }
 
-fn download_package(package_name: String, package_index: &String) {}
+fn download_package(package_name: String, package_index: &String) -> Result<()> {
+    let package_info: PypiData = request_package_info(&package_name, &package_index)?;
+
+    // Example of getting data this will be more robust as the 
+    // PypiData struct gets expanded (meaning less calls to .get())
+    let latest_version = package_info.info.get("version").unwrap();
+    println!("Latest Version of {} is {}", package_name, latest_version);
+
+    Ok(())
+}
 
 fn main() {
     let opt = Opt::from_args();

src/pypi.rs

@@ -0,0 +1,29 @@
+use log::info;
+use serde::{Deserialize, Serialize};
+use std::fmt::Display;
+
+/// 
+/// TODO: Implement more specific structs
+#[derive(Debug, Serialize, Deserialize)]
+pub struct PypiData {
+    pub info: serde_json::value::Value,
+    pub last_serial: i32,
+    pub releases: serde_json::value::Value,
+    pub urls: Vec<serde_json::value::Value>,
+    pub vulnerabilities: Vec<serde_json::value::Value>,
+}
+
+/// Implements Warehouse Pypi API call & JSON conversion
+pub fn request_package_info<T>(package_name: T, package_index: T) -> Result<PypiData, reqwest::Error>
+where
+    T: ToString + Display,
+{
+    let path = format!("{}/pypi/{}/json", package_index, package_name);
+
+    info!("Requesting data from {}", path);
+    let resp: reqwest::blocking::Response = reqwest::blocking::get(path)?;
+
+    let decoded_json: PypiData = resp.json()?;
+
+    Ok(decoded_json)
+}