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scale_proto.go
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scale_proto.go
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// Copyright (c) 2018 Ashley Jeffs
//
// 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 reader
import (
"strings"
"time"
"github.com/go-mangos/mangos"
"github.com/go-mangos/mangos/protocol/pull"
"github.com/go-mangos/mangos/protocol/sub"
"github.com/go-mangos/mangos/transport/ipc"
"github.com/go-mangos/mangos/transport/tcp"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
)
//------------------------------------------------------------------------------
// ScaleProtoConfig is configuration for the ScaleProto input type.
type ScaleProtoConfig struct {
URLs []string `json:"urls" yaml:"urls"`
Bind bool `json:"bind" yaml:"bind"`
SocketType string `json:"socket_type" yaml:"socket_type"`
SubFilters []string `json:"sub_filters" yaml:"sub_filters"`
PollTimeoutMS int `json:"poll_timeout_ms" yaml:"poll_timeout_ms"`
RepTimeoutMS int `json:"reply_timeout_ms" yaml:"reply_timeout_ms"`
}
// NewScaleProtoConfig creates a new ScaleProtoConfig with default values.
func NewScaleProtoConfig() ScaleProtoConfig {
return ScaleProtoConfig{
URLs: []string{"tcp://*:5555"},
Bind: true,
SocketType: "PULL",
SubFilters: []string{},
PollTimeoutMS: 5000,
RepTimeoutMS: 5000,
}
}
//------------------------------------------------------------------------------
// ScaleProto is an input type that serves Scalability Protocols messages.
type ScaleProto struct {
socket mangos.Socket
urls []string
conf ScaleProtoConfig
stats metrics.Type
log log.Modular
}
// NewScaleProto creates a new ScaleProto input type.
func NewScaleProto(conf ScaleProtoConfig, log log.Modular, stats metrics.Type) (Type, error) {
s := ScaleProto{
conf: conf,
stats: stats,
log: log.NewModule(".input.scale_proto"),
}
for _, u := range conf.URLs {
for _, splitU := range strings.Split(u, ",") {
if len(splitU) > 0 {
s.urls = append(s.urls, splitU)
}
}
}
return &s, nil
}
//------------------------------------------------------------------------------
// getSocketFromType returns a socket based on a socket type string.
func getSocketFromType(t string) (mangos.Socket, error) {
switch t {
case "PULL":
return pull.NewSocket()
case "SUB":
return sub.NewSocket()
}
return nil, types.ErrInvalidScaleProtoType
}
//------------------------------------------------------------------------------
// Connect establishes a nanomsg socket.
func (s *ScaleProto) Connect() error {
if s.socket != nil {
return nil
}
var socket mangos.Socket
var err error
defer func() {
if err != nil && socket != nil {
socket.Close()
}
}()
socket, err = getSocketFromType(s.conf.SocketType)
if nil != err {
return err
}
// Set timeout to prevent endless lock.
err = socket.SetOption(
mangos.OptionRecvDeadline,
time.Millisecond*time.Duration(s.conf.PollTimeoutMS),
)
if nil != err {
return err
}
err = socket.SetOption(
mangos.OptionSendDeadline,
time.Millisecond*time.Duration(s.conf.RepTimeoutMS),
)
if nil != err {
return err
}
socket.AddTransport(ipc.NewTransport())
socket.AddTransport(tcp.NewTransport())
if s.conf.Bind {
for _, addr := range s.urls {
if err = socket.Listen(addr); err != nil {
break
}
}
} else {
for _, addr := range s.urls {
if err = socket.Dial(addr); err != nil {
break
}
}
}
if err != nil {
return err
}
for _, filter := range s.conf.SubFilters {
if err = socket.SetOption(mangos.OptionSubscribe, []byte(filter)); err != nil {
return err
}
}
if s.conf.Bind {
s.log.Infof(
"Receiving Scalability Protocols messages at bound URLs: %s\n",
s.urls,
)
} else {
s.log.Infof(
"Receiving Scalability Protocols messages at connected URLs: %s\n",
s.urls,
)
}
s.socket = socket
return nil
}
// Read attempts to read a new message from the nanomsg socket.
func (s *ScaleProto) Read() (types.Message, error) {
if s.socket == nil {
return nil, types.ErrNotConnected
}
data, err := s.socket.Recv()
if err != nil {
if err == mangos.ErrRecvTimeout {
return nil, types.ErrTimeout
}
return nil, err
}
return types.NewMessage([][]byte{data}), nil
}
// Acknowledge instructs whether the pending messages were propagated
// successfully.
func (s *ScaleProto) Acknowledge(err error) error {
return nil
}
// CloseAsync shuts down the ScaleProto input and stops processing requests.
func (s *ScaleProto) CloseAsync() {
}
// WaitForClose blocks until the ScaleProto input has closed down.
func (s *ScaleProto) WaitForClose(timeout time.Duration) error {
if s.socket != nil {
s.socket.Close()
s.socket = nil
}
return nil
}
//------------------------------------------------------------------------------