Refactor more

disk/src/frame/makeframe.rs

@@ -0,0 +1,57 @@
+use crate::cache::BinnedBytesForHttpStreamFrame;
+use crate::raw::conn::RawConnOut;
+use crate::raw::EventQueryJsonStringFrame;
+use bytes::{BufMut, BytesMut};
+use err::Error;
+use serde::Serialize;
+
+pub const INMEM_FRAME_HEAD: usize = 16;
+pub const INMEM_FRAME_MAGIC: u32 = 0xc6c3b73d;
+
+pub trait FrameType {
+    const FRAME_TYPE_ID: u32;
+}
+
+impl FrameType for BinnedBytesForHttpStreamFrame {
+    const FRAME_TYPE_ID: u32 = 0x02;
+}
+
+impl FrameType for EventQueryJsonStringFrame {
+    const FRAME_TYPE_ID: u32 = 0x03;
+}
+
+impl FrameType for RawConnOut {
+    const FRAME_TYPE_ID: u32 = 0x04;
+}
+
+pub fn make_frame<FT>(item: &FT) -> Result<BytesMut, Error>
+where
+    FT: FrameType + Serialize,
+{
+    match bincode::serialize(item) {
+        Ok(enc) => {
+            if enc.len() > u32::MAX as usize {
+                return Err(Error::with_msg(format!("too long payload {}", enc.len())));
+            }
+            let encid = 0x12121212;
+            let mut buf = BytesMut::with_capacity(enc.len() + INMEM_FRAME_HEAD);
+            buf.put_u32_le(INMEM_FRAME_MAGIC);
+            buf.put_u32_le(encid);
+            buf.put_u32_le(FT::FRAME_TYPE_ID);
+            buf.put_u32_le(enc.len() as u32);
+            buf.put(enc.as_ref());
+            Ok(buf)
+        }
+        Err(e) => Err(e)?,
+    }
+}
+
+pub fn make_term_frame() -> BytesMut {
+    let encid = 0x12121313;
+    let mut buf = BytesMut::with_capacity(INMEM_FRAME_HEAD);
+    buf.put_u32_le(INMEM_FRAME_MAGIC);
+    buf.put_u32_le(encid);
+    buf.put_u32_le(0x01);
+    buf.put_u32_le(0);
+    buf
+}