client: add support for proxies

by storing the proxy url as string in the struct and setting it on
each invocation of `execute`, since execute calls reset on the
curl::easy::Easy object.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/client.rs

@@ -91,6 +91,7 @@ impl Headers {
 struct Inner {
     easy: easy::Easy,
     nonce: Option<String>,
+    proxy: Option<String>,
 }
 
 impl Inner {
@@ -98,6 +99,7 @@ impl Inner {
         Self {
             easy: easy::Easy::new(),
             nonce: None,
+            proxy: None,
         }
     }
 
@@ -120,6 +122,10 @@ impl Inner {
 
         self.easy.url(url)?;
 
+        if let Some(p) = &self.proxy {
+            self.easy.proxy(&p)?;
+        }
+
         {
             let mut transfer = self.easy.transfer();
 
@@ -156,6 +162,10 @@ impl Inner {
         })
     }
 
+    pub fn set_proxy(&mut self, proxy: String) {
+            self.proxy = Some(proxy);
+    }
+
     /// Low-level API to run an n API request. This automatically updates the current nonce!
     fn run_request(&mut self, request: Request) -> Result<HttpResponse, Error> {
         self.easy.reset();
@@ -586,6 +596,11 @@ impl Client {
             }
         }
     }
+
+    /// Set a proxy
+    pub fn set_proxy(&mut self, proxy: String) {
+        self.inner.set_proxy(proxy)
+    }
 }
 
 fn parse_header(data: &[u8]) -> Option<(&str, &str)> {