src/http.rs -> src/http_util.rs

So as not to conflict with http crate.

1 files changed, 95 insertions, 0 deletions

diff --git a/src/http_util.rs b/src/http_util.rs
new file mode 100644
index 000000000..0d3189d27
--- /dev/null
+++ b/src/http_util.rs
@@ -0,0 +1,95 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+
+use errors;
+use errors::{DenoError, DenoResult};
+use tokio_util;
+
+use futures::future::{loop_fn, Loop};
+use futures::{Future, Stream};
+use hyper;
+use hyper::client::{Client, HttpConnector};
+use hyper::Uri;
+use hyper_rustls;
+
+type Connector = hyper_rustls::HttpsConnector<HttpConnector>;
+
+lazy_static! {
+  static ref CONNECTOR: Connector = {
+    let num_dns_threads = 4;
+    Connector::new(num_dns_threads)
+  };
+}
+
+pub fn get_client() -> Client<Connector, hyper::Body> {
+  // TODO use Hyper's connection pool.
+  let c = CONNECTOR.clone();
+  Client::builder().build(c)
+}
+
+// The CodeFetch message is used to load HTTP javascript resources and expects a
+// synchronous response, this utility method supports that.
+pub fn fetch_sync_string(module_name: &str) -> DenoResult<String> {
+  let url = module_name.parse::<Uri>().unwrap();
+  let client = get_client();
+  // TODO(kevinkassimo): consider set a max redirection counter
+  // to avoid bouncing between 2 or more urls
+  let fetch_future = loop_fn((client, Some(url)), |(client, maybe_url)| {
+    let url = maybe_url.expect("target url should not be None");
+    client
+      .get(url)
+      .map_err(|err| DenoError::from(err))
+      .and_then(|response| {
+        if response.status().is_redirection() {
+          let new_url_string = response
+            .headers()
+            .get("location")
+            .expect("url redirection should provide 'location' header")
+            .to_str()
+            .unwrap()
+            .to_string();
+          debug!("Redirecting to {}...", &new_url_string);
+          let maybe_new_url = Some(
+            new_url_string
+              .parse::<Uri>()
+              .expect("provided redirect url should be a valid url"),
+          );
+          return Ok(Loop::Continue((client, maybe_new_url)));
+        }
+        if !response.status().is_success() {
+          return Err(errors::new(
+            errors::ErrorKind::NotFound,
+            "module not found".to_string(),
+          ));
+        }
+        Ok(Loop::Break(response))
+      })
+  }).and_then(|response| {
+    response
+      .into_body()
+      .concat2()
+      .map(|body| String::from_utf8(body.to_vec()).unwrap())
+      .map_err(|err| DenoError::from(err))
+  });
+
+  tokio_util::block_on(fetch_future)
+}
+
+#[test]
+fn test_fetch_sync_string() {
+  // Relies on external http server. See tools/http_server.py
+  tokio_util::init(|| {
+    let p = fetch_sync_string("http://127.0.0.1:4545/package.json").unwrap();
+    println!("package.json len {}", p.len());
+    assert!(p.len() > 1);
+  });
+}
+
+#[test]
+fn test_fetch_sync_string_with_redirect() {
+  // Relies on external http server. See tools/http_server.py
+  tokio_util::init(|| {
+    let p = fetch_sync_string("http://127.0.0.1:4546/package.json").unwrap();
+    println!("package.json len {}", p.len());
+    assert!(p.len() > 1);
+  });
+}