Simplify client, remove some allocations

async-stripe/src/client/headers.rs

@@ -1,3 +1,5 @@
+use std::fmt::{Display, Formatter};
+
 use crate::AccountId;
 use crate::ApiVersion;
 use crate::ApplicationId;
@@ -9,16 +11,16 @@
     pub version: Option<String>,
 }
 
-impl ToString for AppInfo {
+impl Display for AppInfo {
     /// Formats a plugin's 'App Info' into a string that can be added to the end of an User-Agent string.
     ///
     /// This formatting matches that of other libraries, and if changed then it should be changed everywhere.
-    fn to_string(&self) -> String {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         match (&self.version, &self.url) {
-            (Some(a), Some(b)) => format!("{}/{} ({})", &self.name, a, b),
-            (Some(a), None) => format!("{}/{}", &self.name, a),
-            (None, Some(b)) => format!("{} ({})", &self.name, b),
-            _ => self.name.to_string(),
+            (Some(a), Some(b)) => write!(f, "{}/{a} ({b})", &self.name),
+            (Some(a), None) => write!(f, "{}/{a}", &self.name),
+            (None, Some(b)) => write!(f, "{} ({b})", &self.name),
+            _ => f.write_str(&self.name),
         }
     }
 }

async-stripe/src/client/stripe.rs

@@ -21,9 +21,7 @@ pub struct Client {
     secret_key: String,
     headers: Headers,
     strategy: RequestStrategy,
-    app_info: Option<AppInfo>,
     api_base: Url,
-    api_root: String,
 }
 
 impl Client {
@@ -44,9 +42,7 @@ impl Client {
                 stripe_account: None,
             },
             strategy: RequestStrategy::Once,
-            app_info: None,
             api_base: Url::parse(url.into()).expect("invalid url"),
-            api_root: "v1".to_string(),
         }
     }
 
@@ -80,8 +76,7 @@ impl Client {
         url: Option<String>,
     ) -> Self {
         let app_info = AppInfo { name, version, url };
-        self.headers.user_agent = format!("{} {}", USER_AGENT, app_info.to_string());
-        self.app_info = Some(app_info);
+        self.headers.user_agent = format!("{USER_AGENT} {app_info}");
         self
     }
 
@@ -156,9 +151,8 @@ impl Client {
             return err(StripeError::QueryStringSerialize(qs_ser_err));
         }
 
-        let body = std::str::from_utf8(params_buffer.as_slice())
-            .expect("Unable to extract string from params_buffer")
-            .to_string();
+        let body =
+            String::from_utf8(params_buffer).expect("Unable to extract string from params_buffer");
 
         req.set_body(Body::from_string(body));
 
@@ -168,7 +162,7 @@ impl Client {
 
     fn url(&self, path: &str) -> Url {
         let mut url = self.api_base.clone();
-        url.set_path(&format!("{}/{}", self.api_root, path.trim_start_matches('/')));
+        url.set_path(&format!("v1/{}", path.trim_start_matches('/')));
         url
     }
 
@@ -179,17 +173,16 @@ impl Client {
         let qs_ser = &mut serde_qs::Serializer::new(&mut params_buffer);
         serde_path_to_error::serialize(&params, qs_ser).map_err(StripeError::from)?;
 
-        let params = std::str::from_utf8(params_buffer.as_slice())
-            .expect("Unable to extract string from params_buffer")
-            .to_string();
+        let params =
+            String::from_utf8(params_buffer).expect("Unable to extract string from params_buffer");
 
         url.set_query(Some(&params));
         Ok(url)
     }
 
     fn create_request(&self, method: Method, url: Url) -> Request {
         let mut req = Request::new(method, url);
-        req.insert_header("authorization", &format!("Bearer {}", self.secret_key));
+        req.insert_header("authorization", format!("Bearer {}", self.secret_key));
 
         for (key, value) in self.headers.to_array().iter().filter_map(|(k, v)| v.map(|v| (*k, v))) {
             req.insert_header(key, value);

openapi/src/url_finder.rs

@@ -24,9 +24,7 @@ impl UrlFinder {
     }
 
     pub fn url_for_object(&self, object: &str) -> Option<String> {
-        let Some(unprefixed_link) = self.doc_links.get(object) else {
-            return None;
-        };
+        let unprefixed_link = self.doc_links.get(object)?;
         Some(format!("https://stripe.com/docs/api{}", unprefixed_link))
     }
 }

stripe_webhook/src/webhook.rs

@@ -1,4 +1,3 @@
-use std::collections::HashMap;
 use std::str::FromStr;
 
 use chrono::Utc;
@@ -138,22 +137,24 @@ struct Signature<'r> {
 
 impl<'r> Signature<'r> {
     fn parse(raw: &'r str) -> Result<Signature<'r>, WebhookError> {
-        let headers: HashMap<&str, &str> = raw
-            .split(',')
-            .map(|header| {
-                let mut key_and_value = header.split('=');
-                let key = key_and_value.next();
-                let value = key_and_value.next();
-                (key, value)
-            })
-            .filter_map(|(key, value)| match (key, value) {
-                (Some(key), Some(value)) => Some((key, value)),
-                _ => None,
-            })
-            .collect();
-        let t = headers.get("t").ok_or(WebhookError::BadSignature)?;
-        let v1 = headers.get("v1").ok_or(WebhookError::BadSignature)?;
-        Ok(Signature { t: t.parse::<i64>().map_err(WebhookError::BadHeader)?, v1 })
+        let mut t: Option<i64> = None;
+        let mut v1: Option<&'r str> = None;
+        for pair in raw.split(',') {
+            let (key, val) = pair.split_once('=').ok_or(WebhookError::BadSignature)?;
+            match key {
+                "t" => {
+                    t = Some(val.parse().map_err(WebhookError::BadHeader)?);
+                }
+                "v1" => {
+                    v1 = Some(val);
+                }
+                _ => {}
+            }
+        }
+        Ok(Signature {
+            t: t.ok_or(WebhookError::BadSignature)?,
+            v1: v1.ok_or(WebhookError::BadSignature)?,
+        })
     }
 }