Implement deno.readlink() (#797)

2 files changed, 39 insertions, 0 deletions

diff --git a/src/handlers.rs b/src/handlers.rs
index eef091174..964baabf8 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -56,6 +56,7 @@ pub extern "C" fn msg_from_js(i: *const isolate, buf: deno_buf) {
     msg::Any::Remove => handle_remove,
     msg::Any::ReadFile => handle_read_file,
     msg::Any::Rename => handle_rename,
+    msg::Any::Readlink => handle_read_link,
     msg::Any::Symlink => handle_symlink,
     msg::Any::SetEnv => handle_set_env,
     msg::Any::Stat => handle_stat,
@@ -702,3 +703,31 @@ fn handle_symlink(i: *const isolate, base: &msg::Base) -> Box<Op> {
     }()))
   }
 }
+
+fn handle_read_link(_i: *const isolate, base: &msg::Base) -> Box<Op> {
+  let msg = base.msg_as_readlink().unwrap();
+  let cmd_id = base.cmd_id();
+  let name = String::from(msg.name().unwrap());
+  Box::new(futures::future::result(|| -> OpResult {
+    debug!("handle_read_link {}", name);
+    let path = fs::read_link(Path::new(&name))?;
+    let builder = &mut FlatBufferBuilder::new();
+    let path_off = builder.create_string(path.to_str().unwrap());
+    let msg = msg::ReadlinkRes::create(
+      builder,
+      &msg::ReadlinkResArgs {
+        path: Some(path_off),
+        ..Default::default()
+      },
+    );
+    Ok(serialize_response(
+      cmd_id,
+      builder,
+      msg::BaseArgs {
+        msg: Some(msg.as_union_value()),
+        msg_type: msg::Any::ReadlinkRes,
+        ..Default::default()
+      },
+    ))
+  }()))
+}
diff --git a/src/msg.fbs b/src/msg.fbs
index ee3930729..6358668b7 100644
--- a/src/msg.fbs
+++ b/src/msg.fbs
@@ -20,6 +20,8 @@ union Any {
   ReadFileRes,
   WriteFile,
   Rename,
+  Readlink,
+  ReadlinkRes,
   Symlink,
   Stat,
   StatRes,
@@ -202,6 +204,14 @@ table Rename {
   newpath: string;
 }
 
+table Readlink {
+  name: string;
+}
+
+table ReadlinkRes {
+  path: string;
+}
+
 table Symlink {
   oldname: string;
   newname: string;