/
rw_dialer.go
182 lines (150 loc) · 3.77 KB
/
rw_dialer.go
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package rpc
import (
"context"
"encoding/binary"
"errors"
"io"
"sync"
pb "github.com/MemeLabs/protobuf/pkg/apis/rpc"
"github.com/MemeLabs/protobuf/pkg/bytereader"
"go.uber.org/zap"
"google.golang.org/protobuf/proto"
)
const defaultMaxMessageBytes = 512 * 1024
// ErrMessageTooLarge emitted when received message exceeds configured limit
var ErrMessageTooLarge = errors.New("received message too large")
// RWDialer ...
type RWDialer struct {
Logger *zap.Logger
ReadWriter io.ReadWriter
MaxMessageBytes int
}
// Dial ...
func (d *RWDialer) Dial(ctx context.Context, dispatcher Dispatcher) (Transport, error) {
maxMessageBytes := d.MaxMessageBytes
if maxMessageBytes == 0 {
maxMessageBytes = defaultMaxMessageBytes
}
return &RWTransport{
ctx: ctx,
logger: d.Logger,
rw: d.ReadWriter,
maxMessageBytes: maxMessageBytes,
dispatcher: dispatcher,
calls: &rwParentCallMap{
callsIn: map[uint64]*CallIn{},
callsOut: map[uint64]*CallOut{},
},
}, nil
}
// RWTransport ...
type RWTransport struct {
ctx context.Context
logger *zap.Logger
rw io.ReadWriter
maxMessageBytes int
dispatcher Dispatcher
calls *rwParentCallMap
wbuf []byte
}
// Listen reads incoming calls
func (t *RWTransport) Listen() error {
b := make([]byte, 1024)
brw := bytereader.New(t.rw)
for {
l, err := binary.ReadUvarint(brw)
if err != nil {
return err
}
if int(l) > t.maxMessageBytes {
return ErrMessageTooLarge
}
if int(l) > cap(b) {
b = make([]byte, l)
}
b = b[:l]
if _, err := io.ReadAtLeast(t.rw, b, int(l)); err != nil {
return err
}
req := &pb.Call{}
if err := proto.Unmarshal(b, req); err != nil {
continue
}
call := NewCallIn(t.ctx, req, t.calls.Accessor(req.ParentId), t.send)
t.calls.SetCallIn(req.Id, call)
t.dispatcher.Dispatch(call, func() { t.calls.DeleteCallIn(req.Id) })
if err := t.ctx.Err(); err != nil {
return err
}
}
}
func (t *RWTransport) send(ctx context.Context, call *pb.Call) error {
b := bufPool.Get().([]byte)[:0]
b, err := marshalAppendLengthDelimited(b, call)
defer bufPool.Put(b)
if err != nil {
return err
}
if _, err := t.rw.Write(b); err != nil {
return err
}
return nil
}
// Call ...
func (t *RWTransport) Call(call *CallOut, fn ResponseFunc) error {
t.calls.SetCallOut(call.ID(), call)
defer t.calls.DeleteCallOut(call.ID())
if err := call.SendRequest(t.send); err != nil {
return err
}
return fn()
}
type rwParentCallMap struct {
callsInLock sync.Mutex
callsIn map[uint64]*CallIn
callsOutLock sync.Mutex
callsOut map[uint64]*CallOut
}
func (m *rwParentCallMap) SetCallIn(id uint64, c *CallIn) {
m.callsInLock.Lock()
defer m.callsInLock.Unlock()
m.callsIn[id] = c
}
func (m *rwParentCallMap) CallIn(id uint64) *CallIn {
m.callsInLock.Lock()
defer m.callsInLock.Unlock()
return m.callsIn[id]
}
func (m *rwParentCallMap) DeleteCallIn(id uint64) {
m.callsInLock.Lock()
defer m.callsInLock.Unlock()
delete(m.callsIn, id)
}
func (m *rwParentCallMap) SetCallOut(id uint64, c *CallOut) {
m.callsOutLock.Lock()
defer m.callsOutLock.Unlock()
m.callsOut[id] = c
}
func (m *rwParentCallMap) CallOut(id uint64) *CallOut {
m.callsOutLock.Lock()
defer m.callsOutLock.Unlock()
return m.callsOut[id]
}
func (m *rwParentCallMap) DeleteCallOut(id uint64) {
m.callsOutLock.Lock()
defer m.callsOutLock.Unlock()
delete(m.callsOut, id)
}
func (m *rwParentCallMap) Accessor(id uint64) ParentCallAccessor {
return &rwParentCallAccessor{id, m}
}
type rwParentCallAccessor struct {
id uint64
m *rwParentCallMap
}
func (a *rwParentCallAccessor) ParentCallIn() *CallIn {
return a.m.CallIn(a.id)
}
func (a *rwParentCallAccessor) ParentCallOut() *CallOut {
return a.m.CallOut(a.id)
}