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pipeline.go
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pipeline.go
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// Copyright 2018-2020 Burak Sezer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"bytes"
"github.com/hashicorp/go-multierror"
"io"
"sync"
"time"
"github.com/buraksezer/olric/internal/protocol"
)
// Pipeline implements pipelining feature for Olric Binary Protocol.
// It enables to send multiple commands to the server without
// waiting for the replies at all, and finally read the replies
// in a single step. All methods are thread-safe. So you can call them in
// different goroutines safely.
type Pipeline struct {
c *Client
m sync.Mutex
buf *bytes.Buffer
}
// NewPipeline returns a new Pipeline.
func (c *Client) NewPipeline() *Pipeline {
return &Pipeline{
c: c,
buf: bytes.NewBuffer(nil),
}
}
// Put appends a Put command to the underlying buffer with the given parameters.
func (p *Pipeline) Put(dmap, key string, value interface{}) error {
p.m.Lock()
defer p.m.Unlock()
data, err := p.c.serializer.Marshal(value)
if err != nil {
return err
}
req := protocol.NewDMapMessage(protocol.OpPut)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(data)
req.SetExtra(protocol.PutExtra{Timestamp: time.Now().UnixNano()})
return req.Encode()
}
// PutEx appends a PutEx command to the underlying buffer with the given parameters.
func (p *Pipeline) PutEx(dmap, key string, value interface{}, timeout time.Duration) error {
p.m.Lock()
defer p.m.Unlock()
data, err := p.c.serializer.Marshal(value)
if err != nil {
return err
}
req := protocol.NewDMapMessage(protocol.OpPutEx)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(data)
req.SetExtra(protocol.PutExExtra{
TTL: timeout.Nanoseconds(),
Timestamp: time.Now().UnixNano(),
})
return req.Encode()
}
// Get appends a Get command to the underlying buffer with the given parameters.
func (p *Pipeline) Get(dmap, key string) error {
p.m.Lock()
defer p.m.Unlock()
req := protocol.NewDMapMessage(protocol.OpGet)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
return req.Encode()
}
// Delete appends a Delete command to the underlying buffer with the given parameters.
func (p *Pipeline) Delete(dmap, key string) error {
p.m.Lock()
defer p.m.Unlock()
req := protocol.NewDMapMessage(protocol.OpDelete)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
return req.Encode()
}
func (p *Pipeline) incrOrDecr(opcode protocol.OpCode, dmap, key string, delta int) error {
p.m.Lock()
defer p.m.Unlock()
value, err := p.c.serializer.Marshal(delta)
if err != nil {
return err
}
req := protocol.NewDMapMessage(opcode)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(value)
req.SetExtra(protocol.AtomicExtra{Timestamp: time.Now().UnixNano()})
return req.Encode()
}
// Incr appends an Incr command to the underlying buffer with the given parameters.
func (p *Pipeline) Incr(dmap, key string, delta int) error {
return p.incrOrDecr(protocol.OpIncr, dmap, key, delta)
}
// Decr appends a Decr command to the underlying buffer with the given parameters.
func (p *Pipeline) Decr(dmap, key string, delta int) error {
return p.incrOrDecr(protocol.OpDecr, dmap, key, delta)
}
// GetPut appends a GetPut command to the underlying buffer with the given parameters.
func (p *Pipeline) GetPut(dmap, key string, value interface{}) error {
p.m.Lock()
defer p.m.Unlock()
data, err := p.c.serializer.Marshal(value)
if err != nil {
return err
}
req := protocol.NewDMapMessage(protocol.OpGetPut)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(data)
req.SetExtra(protocol.AtomicExtra{Timestamp: time.Now().UnixNano()})
return req.Encode()
}
// Destroy appends a Destroy command to the underlying buffer with the given parameters.
func (p *Pipeline) Destroy(dmap string) error {
p.m.Lock()
defer p.m.Unlock()
req := protocol.NewDMapMessage(protocol.OpDestroy)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
return req.Encode()
}
// PutIf appends a PutIf command to the underlying buffer.
//
// Flag argument currently has two different options:
//
// olric.IfNotFound: Only set the key if it does not already exist.
// It returns olric.ErrFound if the key already exist.
//
// olric.IfFound: Only set the key if it already exist.
// It returns olric.ErrKeyNotFound if the key does not exist.
func (p *Pipeline) PutIf(dmap, key string, value interface{}, flags int16) error {
p.m.Lock()
defer p.m.Unlock()
data, err := p.c.serializer.Marshal(value)
if err != nil {
return err
}
req := protocol.NewDMapMessage(protocol.OpPutIf)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(data)
req.SetExtra(protocol.PutIfExtra{
Flags: flags,
Timestamp: time.Now().UnixNano(),
})
return req.Encode()
}
// PutIfEx appends a PutIfEx command to the underlying buffer.
//
// Flag argument currently has two different options:
//
// olric.IfNotFound: Only set the key if it does not already exist.
// It returns olric.ErrFound if the key already exist.
//
// olric.IfFound: Only set the key if it already exist.
// It returns olric.ErrKeyNotFound if the key does not exist.
func (p *Pipeline) PutIfEx(dmap, key string, value interface{}, timeout time.Duration, flags int16) error {
p.m.Lock()
defer p.m.Unlock()
data, err := p.c.serializer.Marshal(value)
if err != nil {
return err
}
req := protocol.NewDMapMessage(protocol.OpPutIfEx)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetValue(data)
req.SetExtra(protocol.PutIfExExtra{
Flags: flags,
TTL: timeout.Nanoseconds(),
Timestamp: time.Now().UnixNano(),
})
return req.Encode()
}
// Expire updates the expiry for the given key. It returns ErrKeyNotFound if the
// DB does not contains the key. It's thread-safe.
func (p *Pipeline) Expire(dmap, key string, timeout time.Duration) error {
p.m.Lock()
defer p.m.Unlock()
req := protocol.NewDMapMessage(protocol.OpExpire)
req.SetBuffer(p.buf)
req.SetDMap(dmap)
req.SetKey(key)
req.SetExtra(protocol.ExpireExtra{
TTL: timeout.Nanoseconds(),
Timestamp: time.Now().UnixNano(),
})
return req.Encode()
}
// Flush flushes all the commands to the server using a single write call.
func (p *Pipeline) Flush() ([]PipelineResponse, error) {
p.m.Lock()
defer p.m.Unlock()
defer p.buf.Reset()
req := protocol.NewPipelineMessage(protocol.OpPipeline)
req.SetValue(p.buf.Bytes())
resp, err := p.c.client.Request(req)
if err != nil {
return nil, err
}
// Decode the pipelined messages from pipeline response.
conn := protocol.NewBytesToConn(resp.Value())
var responses []PipelineResponse
var resErr error
flushMessage := func() error {
buf := bufferPool.Get()
defer bufferPool.Put(buf)
_, err = protocol.ReadMessage(conn, buf)
pres := protocol.NewDMapMessageFromRequest(buf)
err = pres.Decode()
if err != nil {
return err
}
pr := PipelineResponse{
Client: p.c,
response: pres,
}
responses = append(responses, pr)
return nil
}
for {
err := flushMessage()
if err == io.EOF {
break
}
if err != nil {
resErr = multierror.Append(resErr, err)
continue
}
}
return responses, resErr
}