feat(core): streams (#12596)

This allows resources to be "streams" by implementing read/write/shutdown. These streams are implicit since their nature (read/write/duplex) isn't known until called, but we could easily add another method to explicitly tag resources as streams.

`op_read/op_write/op_shutdown` are now builtin ops provided by `deno_core`

Note: this current implementation is simple & straightforward but it results in an additional alloc per read/write call

Closes #12556

1 files changed, 15 insertions, 0 deletions

diff --git a/core/01_core.js b/core/01_core.js
index 9d4bab65d..75bfc884f 100644
--- a/core/01_core.js
+++ b/core/01_core.js
@@ -146,6 +146,18 @@
     return ObjectFromEntries(opSync("op_resources"));
   }
 
+  function read(rid, buf) {
+    return opAsync("op_read", rid, buf);
+  }
+
+  function write(rid, buf) {
+    return opAsync("op_write", rid, buf);
+  }
+
+  function shutdown(rid) {
+    return opAsync("op_shutdown", rid);
+  }
+
   function close(rid) {
     opSync("op_close", rid);
   }
@@ -191,6 +203,9 @@
     ops,
     close,
     tryClose,
+    read,
+    write,
+    shutdown,
     print,
     resources,
     metrics,