bring back json ops (#2815)

cli/ops/files.rs

@@ -1,5 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 use super::dispatch_flatbuffers::serialize_response;
+use super::dispatch_json::{Deserialize, JsonOp, Value};
 use super::utils::*;
 use crate::deno_error;
 use crate::fs as deno_fs;
@@ -14,17 +15,22 @@ use std;
 use std::convert::From;
 use tokio;
 
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct OpenArgs {
+  promise_id: Option<u64>,
+  filename: String,
+  mode: String,
+}
+
 pub fn op_open(
   state: &ThreadSafeState,
-  base: &msg::Base<'_>,
-  data: Option<PinnedBuf>,
-) -> CliOpResult {
-  assert!(data.is_none());
-  let cmd_id = base.cmd_id();
-  let inner = base.inner_as_open().unwrap();
-  let (filename, filename_) =
-    deno_fs::resolve_from_cwd(inner.filename().unwrap())?;
-  let mode = inner.mode().unwrap();
+  args: Value,
+  _zero_copy: Option<PinnedBuf>,
+) -> Result<JsonOp, ErrBox> {
+  let args: OpenArgs = serde_json::from_value(args)?;
+  let (filename, filename_) = deno_fs::resolve_from_cwd(&args.filename)?;
+  let mode = args.mode.as_ref();
 
   let mut open_options = tokio::fs::OpenOptions::new();
 
@@ -75,44 +81,39 @@ pub fn op_open(
     }
   }
 
+  let is_sync = args.promise_id.is_none();
   let op = open_options.open(filename).map_err(ErrBox::from).and_then(
     move |fs_file| {
       let resource = resources::add_fs_file(fs_file);
-      let builder = &mut FlatBufferBuilder::new();
-      let inner =
-        msg::OpenRes::create(builder, &msg::OpenResArgs { rid: resource.rid });
-      Ok(serialize_response(
-        cmd_id,
-        builder,
-        msg::BaseArgs {
-          inner: Some(inner.as_union_value()),
-          inner_type: msg::Any::OpenRes,
-          ..Default::default()
-        },
-      ))
+      futures::future::ok(json!(resource.rid))
     },
   );
-  if base.sync() {
+
+  if is_sync {
     let buf = op.wait()?;
-    Ok(Op::Sync(buf))
+    Ok(JsonOp::Sync(buf))
   } else {
-    Ok(Op::Async(Box::new(op)))
+    Ok(JsonOp::Async(Box::new(op)))
   }
 }
 
+#[derive(Deserialize)]
+struct CloseArgs {
+  rid: i32,
+}
+
 pub fn op_close(
   _state: &ThreadSafeState,
-  base: &msg::Base<'_>,
-  data: Option<PinnedBuf>,
-) -> CliOpResult {
-  assert!(data.is_none());
-  let inner = base.inner_as_close().unwrap();
-  let rid = inner.rid();
-  match resources::lookup(rid) {
+  args: Value,
+  _zero_copy: Option<PinnedBuf>,
+) -> Result<JsonOp, ErrBox> {
+  let args: CloseArgs = serde_json::from_value(args)?;
+
+  match resources::lookup(args.rid as u32) {
     None => Err(deno_error::bad_resource()),
     Some(resource) => {
       resource.close();
-      ok_buf(empty_buf())
+      Ok(JsonOp::Sync(json!({})))
     }
   }
 }
@@ -202,27 +203,32 @@ pub fn op_write(
   }
 }
 
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct SeekArgs {
+  promise_id: Option<u64>,
+  rid: i32,
+  offset: i32,
+  whence: i32,
+}
+
 pub fn op_seek(
   _state: &ThreadSafeState,
-  base: &msg::Base<'_>,
-  data: Option<PinnedBuf>,
-) -> CliOpResult {
-  assert!(data.is_none());
-  let inner = base.inner_as_seek().unwrap();
-  let rid = inner.rid();
-  let offset = inner.offset();
-  let whence = inner.whence();
+  args: Value,
+  _zero_copy: Option<PinnedBuf>,
+) -> Result<JsonOp, ErrBox> {
+  let args: SeekArgs = serde_json::from_value(args)?;
 
-  match resources::lookup(rid) {
+  match resources::lookup(args.rid as u32) {
     None => Err(deno_error::bad_resource()),
     Some(resource) => {
-      let op = resources::seek(resource, offset, whence)
-        .and_then(move |_| Ok(empty_buf()));
-      if base.sync() {
+      let op = resources::seek(resource, args.offset, args.whence as u32)
+        .and_then(move |_| futures::future::ok(json!({})));
+      if args.promise_id.is_none() {
         let buf = op.wait()?;
-        Ok(Op::Sync(buf))
+        Ok(JsonOp::Sync(buf))
       } else {
-        Ok(Op::Async(Box::new(op)))
+        Ok(JsonOp::Async(Box::new(op)))
       }
     }
   }