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functions-as-a-service

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A demo showing Google Cloud Functions + Google Maps Platform

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# Functions as a Service

![](https://user-images.githubusercontent.com/744973/56170578-e5675b80-5f96-11e9-9ffe-9492512a0586.png)

The demo shows calling Google Maps Platform APIs from Google Cloud Functions.

## Technologies

- Cloud Functions (Node 10)
  - [Function Framework](https://github.com/GoogleCloudPlatform/functions-framework-nodejs) for local development.
- Google Maps Services ([Node.js Client](https://github.com/googlemaps/google-maps-services-js))
  - Directions API
- TypeScript
  - Google Maps Types: https://www.npmjs.com/package/@types/google__maps
  - Google Cloud Functions Server (Express): https://www.npmjs.com/package/@types/express

## Develop

First install dependencies:

```sh
npm i
```

Then in one tab continually build the project with this command:

```sh
npm run build
```

In another tab, start the web server (and watch if the source code changes):

```sh
API_KEY=<KEY> npm run watch
```

This uses [`npm-watch`](https://www.npmjs.com/package/npm-watch) with the [`functions-framework`](https://www.npmjs.com/package/@google-cloud/functions-framework) to auto re-build the server after changes.

### Test locally

Go to `http://localhost:8080` to run your Google Cloud Function locally.

Here are some example URL requests:

```
http://localhost:8080/directions?mode=driving&origin=37.7841393,-122.404467
http://localhost:8080/origins?origin=6
http://localhost:8080/places?origin=37.7841393,-122.114167
```

### API Key

To create an API key, use the Cloud Console credentials page:

https://console.cloud.google.com/apis/credentials

More detailed instructions can be found in the ["Get API Key" guide](https://developers.google.com/maps/documentation/javascript/get-api-key#detailed_guide).

After creating an API key, enable these APIs:

- [Directions API](http://console.cloud.google.com/google/maps-apis/apis/directions-backend.googleapis.com)
- [Places API](http://console.cloud.google.com/google/maps-apis/apis/places-backend.googleapis.com)

### Deploy

You must create a `.env.yaml` with your API Key:

```env
API_KEY=AIsdfyCnTEiLTroDN14NTtpPm1n7jrBR844ID4A
```

You can deploy this project to Google Cloud Functions by running the following script:

```sh
gcloud config set project $MY_PROJECT
sh deploy.sh
```

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