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GraphQL Ruby Webhook Subscriptions Implementation
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| require 'graphql' | |
| require 'securerandom' | |
| require 'httparty' | |
| class WebhookSubscriptions < GraphQL::Subscriptions | |
| def initialize(**args) | |
| super | |
| # Using concurrent maps to persist events and subscription information | |
| # This can be switched for a DATABASE table/columns | |
| @events = Concurrent::Map.new { |h, event_id| h[event_id] = [] } | |
| @subscriptions = Concurrent::Map.new { |h, subscription_id| h[subscription_id] = {} } | |
| end | |
| def each_subscription_id(event) | |
| @events[event.name].each_with_index do |subscription_id| | |
| yield(subscription_id) | |
| end | |
| end | |
| def read_subscription(subscription_id) | |
| query = @subscriptions[subscription_id][:query] | |
| { | |
| query_string: query.query_string, | |
| variables: query.provided_variables, | |
| context: query.context, | |
| operation_name: query.operation_name, | |
| } | |
| end | |
| def deliver(subscription_id, result) | |
| payload = { result: result.to_h, more: true } | |
| # Webhook callback could be dynamic, based on the subscription id. | |
| HTTParty.post( | |
| {{WEBHOOK_CALLBACK_URL}}, | |
| headers: { | |
| "Content-Type" => "application/json", | |
| }, | |
| body: payload | |
| ) | |
| end | |
| def write_subscription(query, events) | |
| events.each do |ev| | |
| subscription_id = SecureRandom.uuid | |
| @events[ev.name] << subscription_id | |
| @subscriptions[subscription_id] = { query: query } | |
| end | |
| end | |
| end |
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GraphQL Ruby: Subscriptions Transport — Webhooks