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rpc.go
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rpc.go
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/*
* ORBIT - Interlink Remote Applications
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Roland Singer <roland.singer[at]desertbit.com>
* Copyright (c) 2020 Sebastian Borchers <sebastian[at]desertbit.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package rpc
import (
"errors"
"fmt"
"net"
"github.com/desertbit/orbit/internal/api"
"github.com/desertbit/orbit/pkg/packet"
)
// Read the rpc request from the connection,
// If a payload or header buffer is passed, then this buffer will be used
// if the capacity is sufficient.
func Read(
conn net.Conn,
headerBuffer []byte,
payloadBuffer []byte,
maxHeaderSize int,
maxPayloadSize int,
) (
reqType api.RPCType,
header []byte,
payload []byte,
err error,
) {
var (
bytesRead, n int
reqTypeBuf = make([]byte, 1)
)
// Read the reqType from the stream.
for bytesRead == 0 {
n, err = conn.Read(reqTypeBuf)
if err != nil {
return
}
bytesRead += n
}
reqType = api.RPCType(reqTypeBuf[0])
// Read the header from the stream.
header, err = packet.Read(conn, headerBuffer, maxHeaderSize)
if err != nil {
err = fmt.Errorf("failed to read header: %w", err)
return
}
// Read the optional payload from the stream.
payload, err = packet.Read(conn, payloadBuffer, maxPayloadSize)
if err != nil {
if errors.Is(err, packet.ErrZeroData) {
err = nil
} else {
err = fmt.Errorf("failed to read payload: %w", err)
return
}
}
return
}
// Write the rpc request to the connection.
func Write(
conn net.Conn,
reqType api.RPCType,
header []byte,
payload []byte,
maxHeaderSize int,
maxPayloadSize int,
) (err error) {
// Write the request type.
_, err = conn.Write([]byte{byte(reqType)})
if err != nil {
return
}
// Write the header.
err = packet.Write(conn, header, maxHeaderSize)
if err != nil {
err = fmt.Errorf("failed to write header: %w", err)
return
}
// Write the payload.
err = packet.Write(conn, payload, maxPayloadSize)
if err != nil {
err = fmt.Errorf("failed to write payload: %w", err)
return
}
return
}