Dump hex-encoding of images.

Cargo.lock

@@ -67,6 +67,7 @@ name = "catscii"
 version = "0.1.0"
 dependencies = [
  "color-eyre",
+ "pretty-hex",
  "reqwest",
  "serde",
  "tokio",
@@ -639,6 +640,12 @@ version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
+[[package]]
+name = "pretty-hex"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c6fa0831dd7cc608c38a5e323422a0077678fa5744aa2be4ad91c4ece8eec8d5"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.56"

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2018"
 
 [dependencies]
 color-eyre = "0.6"
+pretty-hex = "0.3"
 reqwest = { version = "0.11", features = ["json"] }
 serde = { version = "1", features = ["derive"] }
 tokio = { version = "1", features = ["full"] }

src/main.rs

@@ -1,30 +1,39 @@
+use pretty_hex::PrettyHex;
 use serde::Deserialize;
 
 #[tokio::main]
 async fn main() {
-    let url = get_cat_image_url().await.unwrap();
-    println!("The image is at {}", url);
+    let image_bytes = get_cat_image_bytes().await.unwrap();
+    // only dump the first 200 bytes so our terminal survives the onslaught. This will panic if the
+    // image has fewer than 200 bytes.
+    println!("{:?}", &image_bytes[..200].hex_dump());
 }
 
-async fn get_cat_image_url() -> color_eyre::Result<String> {
-    let api_url = "https://api.thecatapi.com/v1/images/search";
-    let res = reqwest::get(api_url).await?;
-    if !res.status().is_success() {
-        return Err(color_eyre::eyre::eyre!(
-            "The Cat API returned HTTP {}",
-            res.status()
-        ));
-    }
-
+async fn get_cat_image_bytes() -> color_eyre::Result<Vec<u8>> {
     #[derive(Deserialize)]
     struct CatImage {
         url: String,
     }
 
-    let mut images: Vec<CatImage> = res.json().await?;
-    if let Some(image) = images.pop() {
-        Ok(image.url)
-    } else {
-        Err(color_eyre::eyre::eyre!("The Cat API returned no images"))
-    }
+    let api_url = "https://api.thecatapi.com/v1/images/search";
+    let client = reqwest::Client::default();
+
+    let image = client
+        .get(api_url)
+        .send()
+        .await?
+        .error_for_status()?
+        .json::<Vec<CatImage>>()
+        .await?
+        .pop()
+        .ok_or_else(|| color_eyre::eyre::eyre!("The Cat API returned no images"))?;
+
+    Ok(client
+        .get(image.url)
+        .send()
+        .await?
+        .error_for_status()?
+        .bytes()
+        .await?
+        .to_vec())
 }