### Home Classes Methods

### In Files

- lib/chef/rest.rb
- lib/chef/rest/auth_credentials.rb
- lib/chef/rest/cookie_jar.rb
- lib/chef/rest/rest_request.rb

### Parent

Object

### Namespace

- CLASS Chef::REST::AuthCredentials
- CLASS Chef::REST::CookieJar
- CLASS Chef::REST::NoopInflater
- CLASS Chef::REST::RESTRequest

### Methods

- ::new
- #api_request
- #authentication_headers
- #client_name
- #config
- #create_url
- #decompress_body
- #delete
- #delete_rest
- #fetch
- #follow_redirect
- #get
- #get_rest
- #head
- #http_retry_count
- #http_retry_delay
- #post
- #post_rest
- #put
- #put_rest
- #raw_http_request
- #retriable_rest_request
- #sign_requests?
- #signing_key
- #signing_key_filename
- #streaming_request

### Files

- LICENSE

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# Chef::REST

Chef's custom REST client with built-in JSON support and RSA signed header authentication.

### Constants

CONTENT_ENCODING
DEFLATE
GZIP
IDENTITY

### Attributes

auth_credentials[R]
cookies[RW]
redirect_limit[RW]
sign_on_redirect[RW]
url[RW]

### Public Class Methods

new(url, client_name=Chef::Config[:node_name], signing_key_filename=Chef::Config[:client_key], options={}) click to toggle source

Create a REST client object. The supplied `url` is used as the base for all subsequent requests. For example, when initialized with a base url localhost:4000, a call to `get_rest` with 'nodes' will make an HTTP GET request to localhost:4000/nodes

    # File lib/chef/rest.rb, line 61
    def initialize(url, client_name=Chef::Config[:node_name], signing_key_filename=Chef::Config[:client_key], options={})
      @url = url
      @cookies = CookieJar.instance
      @default_headers = options[:headers] || {}
      @signing_key_filename = signing_key_filename
      @key = load_signing_key(@signing_key_filename, options[:raw_key])
      @auth_credentials = AuthCredentials.new(client_name, @key)
      @sign_on_redirect, @sign_request = true, true
      @redirects_followed = 0
      @redirect_limit = 10
      @disable_gzip = false
      handle_options(options)
    end

### Public Instance Methods

api_request(method, url, headers={}, data=false) click to toggle source

Runs an HTTP request to a JSON API with JSON body. File Download not supported.

    # File lib/chef/rest.rb, line 152
    def api_request(method, url, headers={}, data=false)
      json_body = data ? Chef::JSONCompat.to_json(data) : nil
      # Force encoding to binary to fix SSL related EOFErrors
      # cf. http://tickets.opscode.com/browse/CHEF-2363
      # http://redmine.ruby-lang.org/issues/5233
      json_body.force_encoding(Encoding::BINARY) if json_body.respond_to?(:force_encoding)
      raw_http_request(method, url, headers, json_body)
    end

authentication_headers(method, url, json_body=nil) click to toggle source

    # File lib/chef/rest.rb, line 310
    def authentication_headers(method, url, json_body=nil)
      request_params = {:http_method => method, :path => url.path, :body => json_body, :host => "#{url.host}:#{url.port}"}
      request_params[:body] ||= ""
      auth_credentials.signature_headers(request_params)
    end

client_name() click to toggle source

    # File lib/chef/rest.rb, line 79
    def client_name
      @auth_credentials.client_name
    end

config() click to toggle source

    # File lib/chef/rest.rb, line 324
    def config
      Chef::Config
    end

create_url(path) click to toggle source

    # File lib/chef/rest.rb, line 139
    def create_url(path)
      if path =~ /^(http|https):\/\//
        URI.parse(path)
      else
        URI.parse("#{@url}/#{path}")
      end
    end

decompress_body(response) click to toggle source

    # File lib/chef/rest.rb, line 210
    def decompress_body(response)
      if gzip_disabled? || response.body.nil?
        response.body
      else
        case response[CONTENT_ENCODING]
        when GZIP
          Chef::Log.debug "decompressing gzip response"
          Zlib::Inflate.new(Zlib::MAX_WBITS + 16).inflate(response.body)
        when DEFLATE
          Chef::Log.debug "decompressing deflate response"
          Zlib::Inflate.inflate(response.body)
        else
          response.body
        end
      end
    end

delete(path, headers={}) click to toggle source

Send an HTTP DELETE request to the path

    # File lib/chef/rest.rb, line 110
    def delete(path, headers={})
      api_request(:DELETE, create_url(path), headers)
    end

Also aliased as: delete_rest
delete_rest(path, headers={}) click to toggle source
Alias for: delete
fetch(path, headers={}) click to toggle source

Streams a download to a tempfile, then yields the tempfile to a block. After the download, the tempfile will be closed and unlinked. If you rename the tempfile, it will not be deleted. Beware that if the server streams infinite content, this method will stream it until you run out of disk space.

    # File lib/chef/rest.rb, line 135
    def fetch(path, headers={})
      streaming_request(create_url(path), headers) {|tmp_file| yield tmp_file }
    end

follow_redirect() click to toggle source

    # File lib/chef/rest.rb, line 328
    def follow_redirect
      raise Chef::Exceptions::RedirectLimitExceeded if @redirects_followed >= redirect_limit
      @redirects_followed += 1
      Chef::Log.debug("Following redirect #{@redirects_followed}/#{redirect_limit}")
      if @sign_on_redirect
        yield
      else
        @sign_request = false
        yield
      end
    ensure
      @redirects_followed = 0
      @sign_request = true
    end

get(path, raw=false, headers={}) click to toggle source

Send an HTTP GET request to the path

Using this method to `fetch` a file is considered deprecated.

### Parameters

path | The path to GET
raw | Whether you want the raw body returned, or JSON inflated. Defaults

    to JSON inflated.

    # File lib/chef/rest.rb, line 95
    def get(path, raw=false, headers={})
      if raw
        streaming_request(create_url(path), headers)
      else
        api_request(:GET, create_url(path), headers)
      end
    end

Also aliased as: get_rest
get_rest(path, raw=false, headers={}) click to toggle source
Alias for: get
head(path, headers={}) click to toggle source

    # File lib/chef/rest.rb, line 103
    def head(path, headers={})
      api_request(:HEAD, create_url(path), headers)
    end

http_retry_count() click to toggle source

    # File lib/chef/rest.rb, line 320
    def http_retry_count
      config[:http_retry_count]
    end

http_retry_delay() click to toggle source

    # File lib/chef/rest.rb, line 316
    def http_retry_delay
      config[:http_retry_delay]
    end

post(path, json, headers={}) click to toggle source

Send an HTTP POST request to the path

    # File lib/chef/rest.rb, line 117
    def post(path, json, headers={})
      api_request(:POST, create_url(path), headers, json)
    end

Also aliased as: post_rest
post_rest(path, json, headers={}) click to toggle source
Alias for: post
put(path, json, headers={}) click to toggle source

Send an HTTP PUT request to the path

    # File lib/chef/rest.rb, line 124
    def put(path, json, headers={})
      api_request(:PUT, create_url(path), headers, json)
    end

Also aliased as: put_rest
put_rest(path, json, headers={}) click to toggle source
Alias for: put
raw_http_request(method, url, headers, body) click to toggle source

Runs an HTTP request to a JSON API with raw body. File Download not supported.

    # File lib/chef/rest.rb, line 162
    def raw_http_request(method, url, headers, body)
      headers = build_headers(method, url, headers, body)
      retriable_rest_request(method, url, body, headers) do |rest_request|
        begin
          response = rest_request.call {|r| r.read_body}

          Chef::Log.debug("---- HTTP Status and Header Data: ----")
          Chef::Log.debug("HTTP #{response.http_version} #{response.code} #{response.msg}")

          response.each do |header, value|
            Chef::Log.debug("#{header}: #{value}")
          end
          Chef::Log.debug("---- End HTTP Status/Header Data ----")

          response_body = decompress_body(response)

          if response.kind_of?(Net::HTTPSuccess)
            if response['content-type'] =~ /json/
              Chef::JSONCompat.from_json(response_body.chomp)
            else
              Chef::Log.warn("Expected JSON response, but got content-type '#{response['content-type']}'")
              response_body.to_s
            end
          elsif response.kind_of?(Net::HTTPNotModified) # Must be tested before Net::HTTPRedirection because it's subclass.
            false
          elsif redirect_location = redirected_to(response)
            follow_redirect {api_request(:GET, create_url(redirect_location))}
          else
            # have to decompress the body before making an exception for it. But the body could be nil.
            response.body.replace(response_body) if response.body.respond_to?(:replace)

            if response['content-type'] =~ /json/
              exception = Chef::JSONCompat.from_json(response_body)
              msg = "HTTP Request Returned #{response.code} #{response.message}: "
              msg << (exception["error"].respond_to?(:join) ? exception["error"].join(", ") : exception["error"].to_s)
              Chef::Log.info(msg)
            end
            response.error!
          end
        rescue Exception => e
          if e.respond_to?(:chef_rest_request=)
            e.chef_rest_request = rest_request
          end
          raise
        end
      end
    end

retriable_rest_request(method, url, req_body, headers) click to toggle source

    # File lib/chef/rest.rb, line 270
    def retriable_rest_request(method, url, req_body, headers)
      rest_request = Chef::REST::RESTRequest.new(method, url, req_body, headers)

      Chef::Log.debug("Sending HTTP Request via #{method} to #{url.host}:#{url.port}#{rest_request.path}")

      http_attempts = 0

      begin
        http_attempts += 1

        yield rest_request

      rescue SocketError, Errno::ETIMEDOUT => e
        e.message.replace "Error connecting to #{url} - #{e.message}"
        raise e
      rescue Errno::ECONNREFUSED
        if http_retry_count - http_attempts + 1 > 0
          Chef::Log.error("Connection refused connecting to #{url.host}:#{url.port} for #{rest_request.path}, retry #{http_attempts}/#{http_retry_count}")
          sleep(http_retry_delay)
          retry
        end
        raise Errno::ECONNREFUSED, "Connection refused connecting to #{url.host}:#{url.port} for #{rest_request.path}, giving up"
      rescue Timeout::Error
        if http_retry_count - http_attempts + 1 > 0
          Chef::Log.error("Timeout connecting to #{url.host}:#{url.port} for #{rest_request.path}, retry #{http_attempts}/#{http_retry_count}")
          sleep(http_retry_delay)
          retry
        end
        raise Timeout::Error, "Timeout connecting to #{url.host}:#{url.port} for #{rest_request.path}, giving up"
      rescue Net::HTTPFatalError => e
        if http_retry_count - http_attempts + 1 > 0
          sleep_time = 1 + (2 ** http_attempts) + rand(2 ** http_attempts)
          Chef::Log.error("Server returned error for #{url}, retrying #{http_attempts}/#{http_retry_count} in #{sleep_time}s")
          sleep(sleep_time)
          retry
        end
        raise
      end
    end

sign_requests?() click to toggle source

    # File lib/chef/rest.rb, line 147
    def sign_requests?
      auth_credentials.sign_requests? && @sign_request
    end

signing_key() click to toggle source

    # File lib/chef/rest.rb, line 83
    def signing_key
      @raw_key
    end

signing_key_filename() click to toggle source

    # File lib/chef/rest.rb, line 75
    def signing_key_filename
      @signing_key_filename
    end

streaming_request(url, headers, &block) click to toggle source

Makes a streaming download request. Doesn't speak JSON. Streams the response body to a tempfile. If a block is given, it's passed to Tempfile.open(), which means that the tempfile will automatically be unlinked after the block is executed.

If no block is given, the tempfile is returned, which means it's up to you to unlink the tempfile when you're done with it.

    # File lib/chef/rest.rb, line 234
    def streaming_request(url, headers, &block)
      headers = build_headers(:GET, url, headers, nil, true)
      retriable_rest_request(:GET, url, nil, headers) do |rest_request|
        begin
          tempfile = nil
          response = rest_request.call do |r|
            if block_given? && r.kind_of?(Net::HTTPSuccess)
              begin
                tempfile = stream_to_tempfile(url, r, &block)
                yield tempfile
              ensure
                tempfile.close!
              end
            else
              tempfile = stream_to_tempfile(url, r)
            end
          end
          if response.kind_of?(Net::HTTPSuccess)
            tempfile
          elsif redirect_location = redirected_to(response)
            # TODO: test tempfile unlinked when following redirects.
            tempfile && tempfile.close!
            follow_redirect {streaming_request(create_url(redirect_location), {}, &block)}
          else
            tempfile && tempfile.close!
            response.error!
          end
        rescue Exception => e
          if e.respond_to?(:chef_rest_request=)
            e.chef_rest_request = rest_request
          end
          raise
        end
      end
    end

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