feat: add three more curl multi options (#505)

* feat: new curlmopt

* feat: method for setting max concurrent streams for http2

* test: skip newly added consts

Author: weihanglo

curl-sys/lib.rs

@@ -998,6 +998,9 @@ pub const CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE: CURLMoption = CURLOPTTYPE_OFF_T +
 pub const CURLMOPT_PIPELINING_SITE_BL: CURLMoption = CURLOPTTYPE_OBJECTPOINT + 11;
 pub const CURLMOPT_PIPELINING_SERVER_BL: CURLMoption = CURLOPTTYPE_OBJECTPOINT + 12;
 pub const CURLMOPT_MAX_TOTAL_CONNECTIONS: CURLMoption = CURLOPTTYPE_LONG + 13;
+pub const CURLMOPT_PUSHFUNCTION: CURLMoption = CURLOPTTYPE_FUNCTIONPOINT + 14;
+pub const CURLMOPT_PUSHDATA: CURLMoption = CURLOPTTYPE_OBJECTPOINT + 15;
+pub const CURLMOPT_MAX_CONCURRENT_STREAMS: CURLMoption = CURLOPTTYPE_LONG + 16;
 
 // These enums are for use with the CURLMOPT_PIPELINING option.
 pub const CURLPIPE_NOTHING: c_long = 0;

src/multi.rs

@@ -371,6 +371,15 @@ impl Multi {
         self.setopt_long(curl_sys::CURLMOPT_MAX_PIPELINE_LENGTH, val as c_long)
     }
 
+    /// Sets the number of max concurrent streams for http2.
+    ///
+    /// This sets the max number will be used as the maximum number of
+    /// concurrent streams for a connections that libcurl should support on
+    /// connections done using HTTP/2. Defaults to 100.
+    pub fn set_max_concurrent_streams(&mut self, val: usize) -> Result<(), MultiError> {
+        self.setopt_long(curl_sys::CURLMOPT_MAX_CONCURRENT_STREAMS, val as c_long)
+    }
+
     fn setopt_long(&mut self, opt: curl_sys::CURLMoption, val: c_long) -> Result<(), MultiError> {
         unsafe { cvt(curl_sys::curl_multi_setopt(self.raw.handle, opt, val)) }
     }

systest/build.rs

@@ -137,6 +137,12 @@ fn main() {
                 _ => {}
             }
         }
+        if version < 67 {
+            match s {
+                "CURLMOPT_MAX_CONCURRENT_STREAMS" => return true,
+                _ => {}
+            }
+        }
         if version < 66 {
             match s {
                 "CURL_HTTP_VERSION_3" => return true,
@@ -222,6 +228,12 @@ fn main() {
                 return true;
             }
         }
+        if version < 44 {
+            match s {
+                "CURLMOPT_PUSHDATA" | "CURLMOPT_PUSHFUNCTION" => return true,
+                _ => {}
+            }
+        }
         if version < 43 {
             if s.starts_with("CURLPIPE_") {
                 return true;