Class: GraphQL::Client::HTTP

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/client/http.rb

Overview

Public: Basic HTTP network adapter.

GraphQL::Client::Client.new(
  fetch: GraphQL::Client::HTTP.new("http://graphql-swapi.parseapp.com/")
)

Assumes GraphQL endpoint follows the express-graphql endpoint conventions.

https://github.com/graphql/express-graphql#http-usage

Production applications should consider implementing there own network adapter. This class exists for trivial stock usage and allows for minimal request header configuration.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(uri, &block) ⇒ HTTP

Public: Create HTTP adapter instance for a single GraphQL endpoint.

GraphQL::Client::HTTP.new("http://graphql-swapi.parseapp.com/") do
  def headers(query)
    { "User-Agent": "My Client" }
  end
end

uri - String endpoint URI block - Optional block to configure class



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# File 'lib/graphql/client/http.rb', line 30

def initialize(uri, &block)
  @uri = URI.parse(uri)
  class_eval(&block) if block_given?
end

Instance Attribute Details

#uri ⇒ Object (readonly)

Public: Parsed endpoint URI

Returns URI.



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# File 'lib/graphql/client/http.rb', line 38

def uri
  @uri
end

Instance Method Details

#call(query) ⇒ Object

Public: Make an HTTP request for GraphQL query.

Implements Client’s “fetch” adapter interface.

query - The GraphQL::Client::Query being sent

Returns { “data” => … , “errors” => … } Hash.



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# File 'lib/graphql/client/http.rb', line 56

def call(query)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = uri.scheme == "https"

  request = Net::HTTP::Post.new(uri.request_uri)

  request["Accept"] = "application/json"
  request["Content-Type"] = "application/json"
  headers(query).each { |name, value| request[name] = value }

  body = {}
  body["query"] = query.to_s
  body["variables"] = JSON.generate(query.variables) if query.variables.any?
  body["operationName"] = query.operation_name if query.operation_name
  request.body = JSON.generate(body)

  response = http.request(request)
  JSON.parse(response.body)
end

#headers(_) ⇒ Object

Public: Extension point for subclasses to set custom request headers.

query - The GraphQL::Client::Query being sent

Returns Hash of String header names and values.



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# File 'lib/graphql/client/http.rb', line 45

def headers(_)
  {}
end