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microservice.go
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microservice.go
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package gosf
import (
"encoding/json"
"sync"
"time"
io "github.com/ambelovsky/gosf-socketio"
transport "github.com/ambelovsky/gosf-socketio/transport"
)
var maxConnections int
type GoMessage struct {
message *Message
error error
}
func init() {
App.Microservices = make(map[string]*Microservice)
maxConnections = 2
}
// Microservice defines a microservice connection
type Microservice struct {
host string
port int
secure bool
transport *transport.WebsocketTransport
clients []*io.Client
nextClient int
nextClientMutex sync.Mutex
}
func (m *Microservice) configure(host string, port int, secure bool) *Microservice {
m.host = host
m.port = port
m.secure = secure
m.transport = transport.GetDefaultWebsocketTransport()
return m
}
// Connected tells whether or not this microservice's connection is still active and alive
func (m *Microservice) Connected() bool {
if len(m.clients) < 1 {
return false
}
connected := true
for _, c := range m.clients {
if !c.IsAlive() {
connected = false
break
}
}
return connected
}
// Connect manually connects or reconnects to the microservice
func (m *Microservice) Connect() (*Microservice, error) {
url := io.GetUrl(m.host, m.port, m.secure)
if m.Connected() {
m.Disconnect()
}
if len(m.clients) < 1 {
for i := 0; i < maxConnections; i++ {
newCli, err := io.Dial(url, m.transport)
if err != nil {
return m, err
}
m.clients = append(m.clients, newCli)
}
} else {
for i := range m.clients {
var err error
m.clients[i], err = io.Dial(url, m.transport)
if err != nil {
return m, err
}
}
}
return m, nil
}
// Disconnect manually terminates the connection to the microservice
func (m *Microservice) Disconnect() {
if m.Connected() == false {
return
}
for i := range m.clients {
m.clients[i].Close()
}
}
// Listen registers and event handler for a microservice endpoint
func (m *Microservice) Listen(endpoint string, callback func(message *Message)) {
for i := range m.clients {
m.clients[i].On(endpoint, callback)
}
}
func (m *Microservice) getNextClient() *io.Client {
m.nextClientMutex.Lock()
defer m.nextClientMutex.Unlock()
m.nextClient++
if m.nextClient >= maxConnections {
m.nextClient = 0
}
return m.clients[m.nextClient]
}
// Call sends a request to the microservice
func (m *Microservice) Call(endpoint string, message *Message) (*Message, error) {
msResponse := new(Message)
if duration, err := time.ParseDuration("2s"); err != nil {
return nil, err
} else if raw, err := m.getNextClient().Ack(endpoint, message, duration); err != nil {
return nil, err
} else if err := json.Unmarshal([]byte(raw), msResponse); err != nil {
return nil, err
}
err := recover()
if err != nil {
return nil, err.(error)
}
return msResponse, nil
}
// Go sends a request to the microservice returning channels
func (m *Microservice) Go(endpoint string, message *Message) chan *GoMessage {
goChan := make(chan *GoMessage)
go func(goChan chan *GoMessage) {
msg, err := m.Call(endpoint, message)
goMsg := &GoMessage{
message: msg,
error: err,
}
goChan <- goMsg
}(goChan)
return goChan
}
// Lob sends a request to the microservice that does not require a response
func (m *Microservice) Lob(endpoint string, message *Message) error {
err := m.getNextClient().Emit(endpoint, message)
return err
}
// ReadGoMessage reads from a microservice Go channel of type *GoMessage
func ReadGoMessage(chMsg chan *GoMessage) (*Message, error) {
msg := <-chMsg
return msg.message, msg.error
}
// RegisterMicroservice configures, automatically connects, and adds the microservice to App.Microservices
func RegisterMicroservice(name string, host string, port int, secure bool) error {
App.Microservices[name] = new(Microservice)
App.Microservices[name].configure(host, port, secure)
_, err := App.Microservices[name].Connect()
return err
}
// DeregisterMicroservice disconnects and removes a microservice from App.Microservices
func DeregisterMicroservice(name string) {
App.Microservices[name].Disconnect()
delete(App.Microservices, name)
}
// GetMicroservice retrieves a microservice reference from App.Microservices
func GetMicroservice(name string) *Microservice {
if microservice, ok := App.Microservices[name]; ok {
return microservice
}
return nil
}