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https://github.com/orbit-apps/elixir-shopifyapi


https://github.com/orbit-apps/elixir-shopifyapi

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README 

        
# ShopifyAPI and Plug.ShopifyAPI



- [ShopifyAPI and Plug.ShopifyAPI](#ShopifyAPI-and-PlugShopifyAPI)

  - [Installation](#Installation)

  - [Installing this app in a Shop](#Installing-this-app-in-a-Shop)

  - [Configuration](#Configuration)

    - [API Version](#API-Version)

    - [Supervisor](#supervisor)

    - [Background Runner](#Background-Runner)

    - [Shops](#Shops)

    - [Apps](#Apps)

    - [AuthTokens](#AuthTokens)

  - [Webhooks](#Webhooks)

  - [GraphQL](#GraphQL)

  - [Telemetry](#Telemetry)



## Installation



The package can be installed by adding `shopify_api` to your list of dependencies in `mix.exs`.



```elixir

def deps do

  [

    {:shopify_api, github: "pixelunion/elixir-shopifyapi", tag: "v0.15.6"}

  ]

end

```



Add it to your phoenix routes.



```elixir

scope "/shop" do

  forward("/", ShopifyAPI.Router)

end

```



To handle incoming webhooks from Shopify, add the `ShopifyAPI.Plugs.Webhook` to your `Endpoint` module (before the JSON parser configuration):



```elixir

plug ShopifyAPI.Plugs.Webhook,

  app_name: "my-app-name",

  prefix: "/shopify/webhook",

  callback: {WebhookHandler, :handle_webhook, []}

```



If you want persisted Apps, Shops, and Tokens add configuration to your functions.

```elixir

config :shopify_api, ShopifyAPI.AuthTokenServer,

  initializer: {MyApp.AuthToken, :init, []},

  persistence: {MyApp.AuthToken, :save, []}

config :shopify_api, ShopifyAPI.AppServer,

  initializer: {MyApp.ShopifyApp, :init, []},

  persistence: {MyApp.ShopifyApp, :save, []}

config :shopify_api, ShopifyAPI.ShopServer,

  initializer: {MyApp.Shop, :init, []},

  persistence: {MyApp.Shop, :save, []}

```



## Installing this app in a Shop



There is a boilerplate repo for quickly getting up and running at [ShopifyApp](https://github.com/pixelunion/elixir-shopify-app)



1. Start something like ngrok

2. Configure your app to allow your ngrok url as one of the redirect_urls

3. Point your browser to `http://localhost:4000/shop/install?shop=your-shop.myshopify.com&app=yourapp` and it should prompt you to login and authorize it.



## Configuration



### API Version



Shopify introduced API versioning here: https://help.shopify.com/en/api/versioning



Configure the version to use in your config.exs, it will default to a stable version as ref'd in the [request module](lib/shopify_api/rest/request.ex).



```elixir

config :shopify_api, ShopifyAPI.REST, api_version: "2019-04"

```



### Supervisor



The ShopifyAPI has three servers for caching commonly-used structs - `AppServer`, `ShopServer`, and `AuthTokenServer`.

These act as a write-through caching layer for their corresponding data structure.



A supervisor `ShopifyAPI.Supervisor` is provided to start up and supervise all three servers.

Add it to your application's supervision tree, and define [hooks for preloading data](#Installation).



NOTE: Make sure you place the supervisor after any dependencies used in preloading the data. (ie Ecto)



Add the following to your application:



```elixir

def start(_type, _args) do

  children = [

    MyApp.Repo,

    ShopifyAPI.Supervisor

  ]



  Supervisor.start_link(children, strategy: :one_for_one)

end

```



## Webhooks



To set up your app to receive webhooks, first you'll need to add `ShopifyAPI.Plugs.Webhook` to your `Endpoint` module:



```elixir

plug ShopifyAPI.Plugs.Webhook,

  app_name: "my-app-name",

  prefix: "/shopify/webhook",

  callback: {WebhookHandler, :handle_webhook, []}

```



You'll also need to define a corresponding `WebhookHandler` module in your app:



```elixir

defmodule WebhookHandler do

  def handle_webhook(app, shop, domain, payload) do

    # TODO implement me!

  end

end

```



And there you go!



Now webhooks sent to `YOUR_URL/shopify/webhook` will be interpreted as webhooks for the `my-app-name` app.

If you append an app name to the URL in the Shopify configuration, that app will be used instead (e.g. `/shopify/webhook/private-app-name`).



If you'd like to install webhooks using ShopifyAPI, we need to do a small bit more work:



```elixir

# Add this to your configuration so that ShopifyAPI knows the webhook prefix.

config :shopify_api, ShopifyAPI.Webhook, uri: "https://your-app-url/shop/webhook"

```



Now once a shop is installed, you can create webhook subscriptions.

This will automatically append your app's name to the generated webhook URL:



```elixir

token = ShopifyAPI.AuthTokenServer.get("shop domain", "app name")



topic = "orders/create"

server_address = ShopifyAPI.REST.Webhook.webhook_uri(token)

webhook = %{topic: topic, address: server_address}



ShopifyAPI.REST.Webhook.create(token, %{webhook: webhook})

```



Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)

and published on [HexDocs](https://hexdocs.pm). Once published, the docs can

be found at [https://hexdocs.pm/shopify_api](https://hexdocs.pm/shopify_api).



## GraphQL



`GraphQL` implementation handles GraphQL Queries against Shopify API using HTTPoison library as client, this initial implementation consists of hitting Shopify GraphQL and returning the response in a tuple `{:ok, %Response{}} | {:error, %Response{}}` containing the response and metadata(actualQueryCost, throttleStatus).



Configure the version to use in your config.exs, it will default to a stable version as ref'd in the [graphql module](lib/shopify_api/graphql.ex).



```elixir

config :shopify_api, ShopifyAPI.GraphQL, graphql_version: "2019-07"

```



### GraphQL Response



Because `GraphQL responses` can be a little complex we are parsing/wraping responses `%HTTPoison.response` to `%GraphQL.Response`.



Successful response:



```elixir

{:ok, %ShopifyAPI.GraphQL.Response{response: %{}, metadata: %{}, status_code: code}}

```



Failed response:



```elixir

{:error, %HTTPoison.Response{}}

```



## Telemetry



The `shopify_api` library will emit events using the [`:telemetry`](https://github.com/beam-telemetry/telemetry) library. Consumers of `shopify_api` can then use these events for customized metrics aggregation and more.

The following telemetry events are generated:

- `[:shopify_api, :rest_request, :success]`

- `[:shopify_api, :rest_request, :failure]`

- `[:shopify_api, :throttling, :over_limit]`

- `[:shopify_api, :throttling, :within_limit]`

- `[:shopify_api, :graphql_request, :success]`

- `[:shopify_api, :graphql_request, :failure]`

- `[:shopify_api, :bulk_operation, :success]`

- `[:shopify_api, :bulk_operation, :failure]`



As an example, you could use an external module to instrument API requests made by `shopify_api`:



```elixir

defmodule Instrumenter do

  def setup do

    events = [

      [:shopify_api, :rest_request, :success],

      [:shopify_api, :rest_request, :failure]

    ]



    :telemetry.attach_many("my-instrumenter", events, &handle_event/4, nil)

  end



  def handle_event([:shopify_api, :rest_request, :success], measurements, metadata, _config) do

    # Ship success events

  end

end```