add: cacheId parsing and priting

src/main.rs

@@ -1,4 +1,4 @@
-use std::{ffi::OsString, path::PathBuf, str::FromStr, string::FromUtf8Error};
+use std::{ffi::OsString, io::Read, path::PathBuf, str::FromStr, string::FromUtf8Error};
 
 use anyhow::{Context, Result, bail};
 use flate2::{Compression, GzBuilder};
@@ -93,7 +93,6 @@ struct CacheId(u64);
 impl Client {
     fn reserve(&self, key: &CacheKey, cache_size: usize) -> Result<CacheId> {
         let uri = format!("{}_apis/artifactcache/caches", self.base_url);
-        println!("will use uri: {uri}");
         let request = Request::builder()
             .uri(uri)
             .method(Method::POST)
@@ -118,7 +117,25 @@ impl Client {
             );
         }
 
-        todo!()
+        let mut body = Vec::with_capacity(100);
+        response
+            .into_body()
+            .read_to_end(&mut body)
+            .context("reading response body")?;
+        let body_value =
+            serde_json::from_slice::<serde_json::Value>(&body).context("parsing response body")?;
+
+        println!("{body_value:#?}");
+
+        let cache_id = body_value
+            .get("result")
+            .context("response.result")?
+            .get("cacheId")
+            .context("response.result.cacheId")?
+            .as_u64()
+            .context("cacheId as u64")?;
+
+        Ok(CacheId(cache_id))
     }
 }
 
@@ -160,4 +177,6 @@ fn main() {
     let cache_id = client.reserve(&key, output.len()).unwrap();
 
     println!("Reserved cache with id {cache_id:?}");
+
+    todo!();
 }