twilio-go

A client for accessing the Twilio API with several nice features:

• Easy-to-use helpers for purchasing phone numbers and sending MMS messages

• E.164 support, times that are parsed into a time.Time, and other smart types.

• Finer grained control over timeouts with a Context, and the library uses wall-clock HTTP timeouts, not socket timeouts.

• Easy debugging network traffic by setting DEBUG_HTTP_TRAFFIC=true in your environment.

• Easily find calls and messages that occurred between a particular set of time.Times, down to the nanosecond, with GetCallsInRange / GetMessagesInRange.

• It's clear when the library will make a network request, there are no unexpected latency spikes when paging from one resource to the next.

• Uses threads to fetch resources concurrently; for example, has methods to fetch all Media for a Message concurrently.

• Usable, one sentence descriptions of Alerts.

Here are some example use cases:

const sid = "AC123"
const token = "456bef"

client := twilio.NewClient(sid, token, nil)

// Send a message
msg, err := client.Messages.SendMessage("+14105551234", "+14105556789", "Sent via go :) ✓", nil)

// Start a phone call
call, err := client.Calls.MakeCall("+14105551234", "+14105556789",
        "https://kev.inburke.com/zombo/zombocom.mp3")

// Buy a number
number, err := client.IncomingNumbers.BuyNumber("+14105551234")

// Get all calls from a number
data := url.Values{}
data.Set("From", "+14105551234")
callPage, err := client.Calls.GetPage(context.TODO(), data)

// Iterate over calls
iterator := client.Calls.GetPageIterator(url.Values{})
for {
    page, err := iterator.Next(context.TODO())
    if err == twilio.NoMoreResults {
        break
    }
    fmt.Println("start", page.Start)
}

A complete documentation reference can be found at godoc.org.

The API is open to, but unlikely to change, and currently only covers these resources:

• Alerts
• Applications
• Calls
• Conferences
• Faxes
• Incoming Phone Numbers
• Keys
• Messages
• Media
• Monitor
• Outgoing Caller ID's
• Pricing
• Queues
• Recordings
• Transcriptions
• Access Tokens for IPMessaging, Video and Programmable Voice SDK

Error Parsing

If the twilio-go client gets an error from the Twilio API, we attempt to convert it to a rest.Error before returning. Here's an example 404.

&rest.Error{
    Title: "The requested resource ... was not found",
    ID: "20404",
    Detail: "",
    Instance: "",
    Type: "https://www.twilio.com/docs/errors/20404",
    StatusCode: 404
}

Not all errors will be a rest.Error however - HTTP timeouts, canceled context.Contexts, and JSON parse errors (HTML error pages, bad gateway responses from proxies) may also be returned as plain Go errors.

Twiml Generation

There are no plans to support Twiml generation in this library. It may be more readable and maintainable to manually write the XML involved in a Twiml response.

API Problems this Library Solves For You

• Media URL's are returned over HTTP. twilio-go rewrites these URL's to be HTTPS before returning them to you.

• A subset of Notifications returned code 4107, which doesn't exist. These notifications should have error code 14107. We rewrite the error code internally before returning it to you.

• The only provided API for filtering calls or messages by date grabs all messages for an entire day, and the day ranges are only available for UTC. Use GetCallsInRange or GetMessagesInRange to do timezone-aware, finer-grained date filtering.

Errata

You can get Alerts for a given Call or MMS by passing ResourceSid=CA123 as a filter to Alerts.GetPage. This functionality is not documented in the API.

Consulting

I'm available for hire, for Twilio work or general-purpose engineering. For more on what I can do for your company, see here: https://burke.services/twilio.html.

Donating

Donations free up time to make improvements to the library, and respond to bug reports. You can send donations via Paypal's "Send Money" feature to kev@inburke.com. Donations are not tax deductible in the USA.