Popularity
5.5
Growing
Activity
0.0
Stable
143
14
38

Programming language: Go
License: Apache License 2.0
Tags: Networking    

canopus alternatives and similar packages

Based on the "Networking" category.
Alternatively, view canopus alternatives based on common mentions on social networks and blogs.

Do you think we are missing an alternative of canopus or a related project?

Add another 'Networking' Package

Popular Comparisons

SaaSHub - Software Alternatives and Reviews
Sponsored www.saashub.com

README

Canopus

GoDoc Build Status Coverage Status Go Report Card

Canopus is a client/server implementation of the Constrained Application Protocol (CoAP)

Updates

25.11.2016

I've added basic dTLS Support based on Julien Vermillard's implementation. Thanks Julien! It should now support PSK-based authentication. I've also gone ahead and refactored the APIs to make it that bit more Go idiomatic.

Building and running

  1. git submodule update --init --recursive
  2. cd openssl
  3. ./config && make
  4. You should then be able to run the examples in the /examples folder

Simple Example

    // Server
    // See /examples/simple/server/main.go
    server := canopus.NewServer()

    server.Get("/hello", func(req canopus.Request) canopus.Response {
        msg := canopus.ContentMessage(req.GetMessage().GetMessageId(), canopus.MessageAcknowledgment)
        msg.SetStringPayload("Acknowledged: " + req.GetMessage().GetPayload().String())

        res := canopus.NewResponse(msg, nil)
        return res
    })

    server.ListenAndServe(":5683")

    // Client
    // See /examples/simple/client/main.go
    conn, err := canopus.Dial("localhost:5683")
    if err != nil {
        panic(err.Error())
    }

    req := canopus.NewRequest(canopus.MessageConfirmable, canopus.Get, canopus.GenerateMessageID()).(*canopus.CoapRequest)
    req.SetStringPayload("Hello, canopus")
    req.SetRequestURI("/hello")

    resp, err := conn.Send(req)
    if err != nil {
        panic(err.Error())
    }

    fmt.Println("Got Response:" + resp.GetMessage().GetPayload().String())

Observe / Notify

    // Server
    // See /examples/observe/server/main.go
    server := canopus.NewServer()
    server.Get("/watch/this", func(req canopus.Request) canopus.Response {
        msg := canopus.NewMessageOfType(canopus.MessageAcknowledgment, req.GetMessage().GetMessageId(), canopus.NewPlainTextPayload("Acknowledged"))
        res := canopus.NewResponse(msg, nil)

        return res
    })

    ticker := time.NewTicker(3 * time.Second)
    go func() {
        for {
            select {
            case <-ticker.C:
                changeVal := strconv.Itoa(rand.Int())
                fmt.Println("[SERVER << ] Change of value -->", changeVal)

                server.NotifyChange("/watch/this", changeVal, false)
            }
        }
    }()

    server.OnObserve(func(resource string, msg canopus.Message) {
        fmt.Println("[SERVER << ] Observe Requested for " + resource)
    })

    server.ListenAndServe(":5683")

    // Client
    // See /examples/observe/client/main.go
    conn, err := canopus.Dial("localhost:5683")

    tok, err := conn.ObserveResource("/watch/this")
    if err != nil {
        panic(err.Error())
    }

    obsChannel := make(chan canopus.ObserveMessage)
    done := make(chan bool)
    go conn.Observe(obsChannel)

    notifyCount := 0
    for {
        select {
        case obsMsg, _ := <-obsChannel:
            if notifyCount == 5 {
                fmt.Println("[CLIENT >> ] Canceling observe after 5 notifications..")
                go conn.CancelObserveResource("watch/this", tok)
                go conn.StopObserve(obsChannel)
                return
            } else {
                notifyCount++
                // msg := obsMsg.Msg\
                resource := obsMsg.GetResource()
                val := obsMsg.GetValue()

                fmt.Println("[CLIENT >> ] Got Change Notification for resource and value: ", notifyCount, resource, val)
            }
        }
    }

dTLS with PSK

    // Server
    // See /examples/dtls/simple-psk/server/main.go
    server := canopus.NewServer()

    server.Get("/hello", func(req canopus.Request) canopus.Response {
        msg := canopus.ContentMessage(req.GetMessage().GetMessageId(), canopus.MessageAcknowledgment)
        msg.SetStringPayload("Acknowledged: " + req.GetMessage().GetPayload().String())
        res := canopus.NewResponse(msg, nil)

        return res
    })

    server.HandlePSK(func(id string) []byte {
        return []byte("secretPSK")
    })

    server.ListenAndServeDTLS(":5684")

    // Client
    // See /examples/dtls/simple-psk/client/main.go
    conn, err := canopus.DialDTLS("localhost:5684", "canopus", "secretPSK")
    if err != nil {
        panic(err.Error())
    }

    req := canopus.NewRequest(canopus.MessageConfirmable, canopus.Get, canopus.GenerateMessageID())
    req.SetStringPayload("Hello, canopus")
    req.SetRequestURI("/hello")

    resp, err := conn.Send(req)
    if err != nil {
        panic(err.Error())
    }

    fmt.Println("Got Response:" + resp.GetMessage().GetPayload().String())

CoAP-CoAP Proxy

    // Server
    // See /examples/proxy/coap/server/main.go
    server := canopus.NewServer()

    server.Get("/proxycall", func(req canopus.Request) canopus.Response {
        msg := canopus.ContentMessage(req.GetMessage().GetMessageId(), canopus.MessageAcknowledgment)
        msg.SetStringPayload("Data from :5685 -- " + req.GetMessage().GetPayload().String())
        res := canopus.NewResponse(msg, nil)

        return res
    })
    server.ListenAndServe(":5685")

    // Proxy Server
    // See /examples/proxy/coap/proxy/main.go
    server := canopus.NewServer()
    server.ProxyOverCoap(true)

    server.Get("/proxycall", func(req canopus.Request) canopus.Response {
        canopus.PrintMessage(req.GetMessage())
        msg := canopus.ContentMessage(req.GetMessage().GetMessageId(), canopus.MessageAcknowledgment)
        msg.SetStringPayload("Acknowledged: " + req.GetMessage().GetPayload().String())
        res := canopus.NewResponse(msg, nil)

        return res
    })
    server.ListenAndServe(":5683")

    // Client
    // See /examples/proxy/coap/client/main.go
    conn, err := canopus.Dial("localhost:5683")
    if err != nil {
        panic(err.Error())
    }

    req := canopus.NewRequest(canopus.MessageConfirmable, canopus.Get, canopus.GenerateMessageID())
    req.SetProxyURI("coap://localhost:5685/proxycall")

    resp, err := conn.Send(req)
    if err != nil {
        println("err", err)
    }
    canopus.PrintMessage(resp.GetMessage())

CoAP-HTTP Proxy

    // Server
    // See /examples/proxy/http/server/main.go
    server := canopus.NewServer()
    server.ProxyOverHttp(true)

    server.ListenAndServe(":5683")

    // Client
    // See /examples/proxy/http/client/main.go
    conn, err := canopus.Dial("localhost:5683")
    if err != nil {
        panic(err.Error())
    }

    req := canopus.NewRequest(canopus.MessageConfirmable, canopus.Get, canopus.GenerateMessageID())
    req.SetProxyURI("https://httpbin.org/get")

    resp, err := conn.Send(req)
    if err != nil {
        println("err", err)
    }
    canopus.PrintMessage(resp.GetMessage())