Go Client for Google Maps Services

Description

Use Go? Want to geocode something? Looking for directions? Maybe matrices of directions? This library brings the Google Maps API Web Services to your Go application.

The Go Client for Google Maps Services is a Go Client library for the following Google Maps APIs:

• Directions API
• Distance Matrix API
• Elevation API
• Geocoding API
• Places API
• Roads API
• Time Zone API

Keep in mind that the same terms and conditions apply to usage of the APIs when they're accessed through this library.

Support

This library is community supported. We're comfortable enough with the stability and features of the library that we want you to build real production applications on it. We will try to support, through Stack Overflow, the public and protected surface of the library and maintain backwards compatibility in the future; however, while the library is in version 0.x, we reserve the right to make backwards-incompatible changes. If we do remove some functionality (typically because better functionality exists or if the feature proved infeasible), our intention is to deprecate and give developers a year to update their code.

If you find a bug, or have a feature suggestion, please log an issue. If you'd like to contribute, please read How to Contribute.

Requirements

• Go 1.5 or later.
• A Google Maps API key.

API keys

Each Google Maps Web Service requires an API key or Client ID. API keys are freely available with a Google Account at https://developers.google.com/console. To generate a server key for your project:

1. Visit https://developers.google.com/console and log in with a Google Account.
2. Select an existing project, or create a new project.
3. Click Enable an API.
4. Browse for the API, and set its status to "On". The Golang Client for Google Maps Services accesses the following APIs:
   • Directions API
   • Distance Matrix API
   • Elevation API
   • Geocoding API
   • Places API
   • Roads API
   • Time Zone API
5. Once you've enabled the APIs, click Credentials from the left navigation of the Developer Console.
6. In the "Public API access", click Create new Key.
7. Choose Server Key.
8. If you'd like to restrict requests to a specific IP address, do so now.
9. Click Create.

Your API key should be 40 characters long, and begin with AIza.

Important: This key should be kept secret on your server.

Installation

$ go get googlemaps.github.io/maps

Developer Documentation

View the reference documentation

Additional documentation for the included web services is available at https://developers.google.com/maps/ and https://developers.google.com/places/.

• Directions API
• Distance Matrix API
• Elevation API
• Geocoding API
• Places API
• Time Zone API
• Roads API

Usage

Sample usage of the Directions API:

package main

import (
	"log"

	"googlemaps.github.io/maps"
	"github.com/kr/pretty"
	"golang.org/x/net/context"
)

func main() {
	c, err := maps.NewClient(maps.WithAPIKey("Insert-API-Key-Here"))
	if err != nil {
		log.Fatalf("fatal error: %s", err)
	}
	r := &maps.DirectionsRequest{
		Origin:      "Sydney",
		Destination: "Perth",
	}
	resp, _, err := c.Directions(context.Background(), r)
	if err != nil {
		log.Fatalf("fatal error: %s", err)
	}

	pretty.Println(resp)
}

Features

Rate limiting

Never sleep between requests again! By default, requests are sent at the expected rate limits for each web service, typically 10 queries per second for free users. If you want to speed up or slow down requests, you can do that too, using maps.NewClient(maps.WithAPIKey(apiKey), maps.WithRateLimit(qps)).

Keys and Client IDs

Maps API for Work customers can use their client ID and secret to authenticate. Free customers can use their API key, too.

Native types

Native objects for each of the API responses.