Class: Logtail::Integrations::Rack::HTTPEvents

Inherits:
Middleware
  • Object
show all
Defined in:
lib/logtail-rack/http_events.rb

Overview

A Rack middleware that is reponsible for capturing and logging HTTP server requests and response events. The Events::HTTPRequest and Events::HTTPResponse events respectively.

Constant Summary collapse

CONTENT_LENGTH_KEY = 
'Content-Length'.freeze

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Middleware

enabled=, enabled?, #initialize

Constructor Details

This class inherits a constructor from Logtail::Integrations::Rack::Middleware

Class Method Details

.capture_request_body=(value) ⇒ Object

Allows you to capture the HTTP request body, default is off (false).

Capturing HTTP bodies can be extremely helpful when debugging issues, but please proceed with caution:

  1. Capturing HTTP bodies can use quite a bit of data (this can be mitigated, see below)

If you opt to capture bodies, you can also truncate the size to reduce the data captured. See Events::HTTPRequest.

Examples:

Logtail::Integrations::Rack::HTTPEvents.capture_request_body = true


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# File 'lib/logtail-rack/http_events.rb', line 31

def capture_request_body=(value)
  @capture_request_body = value
end

.capture_request_body? ⇒ Boolean

Accessor method for #capture_request_body=

Returns:

  • (Boolean) 


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# File 'lib/logtail-rack/http_events.rb', line 36

def capture_request_body?
  @capture_request_body == true
end

.capture_response_body=(value) ⇒ Object

Just like #capture_request_body= but for the Events::HTTPResponse event. Please see #capture_request_body= for more details. The documentation there also applies here.



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# File 'lib/logtail-rack/http_events.rb', line 43

def capture_response_body=(value)
  @capture_response_body = value
end

.capture_response_body? ⇒ Boolean

Accessor method for #capture_response_body=

Returns:

  • (Boolean) 


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# File 'lib/logtail-rack/http_events.rb', line 48

def capture_response_body?
  @capture_response_body == true
end

.collapse_into_single_event=(value) ⇒ Object

Collapse both the HTTP request and response events into a single log line event. While we don’t recommend this, it can help to reduce log volume if desired. The reason we don’t recommend this, is because the logging service you use should not be so expensive that you need to strip out useful logs. It should also provide the tools necessary to properly search your logs and reduce noise. Such as viewing logs for a specific request.

To provide an example. This setting turns this:

Started GET "/" for 127.0.0.1 at 2012-03-10 14:28:14 +0100
Completed 200 OK in 79ms (Views: 78.8ms | ActiveRecord: 0.0ms)

Into this:

Get "/" sent 200 OK in 79ms

The single event is still a Events::HTTPResponse event. Because we capture HTTP context, you still get the HTTP details, but you will not get all of the request details that the Events::HTTPRequest event would provide.

Examples:

Logtail::Integrations::Rack::HTTPEvents.collapse_into_single_event = true


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# File 'lib/logtail-rack/http_events.rb', line 75

def collapse_into_single_event=(value)
  @collapse_into_single_event = value
end

.collapse_into_single_event? ⇒ Boolean

Accessor method for #collapse_into_single_event=.

Returns:

  • (Boolean) 


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# File 'lib/logtail-rack/http_events.rb', line 80

def collapse_into_single_event?
  @collapse_into_single_event == true
end

.http_header_filters ⇒ Object

Accessor method for #http_header_filters=



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# File 'lib/logtail-rack/http_events.rb', line 117

def http_header_filters
  @http_header_filters
end

.http_header_filters=(value) ⇒ Object

Filter sensitive HTTP headers (such as “Authorization: Bearer secret_token”)

Filtered HTTP header values will be sent to Better Stack as “[FILTERED]”

Examples:

Logtail::Integrations::Rack::HTTPEvents.http_header_filters = ["Authorization"]


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# File 'lib/logtail-rack/http_events.rb', line 112

def http_header_filters=(value)
  @http_header_filters = value.map { |header_name| normalize_header_name(header_name) }
end

.normalize_header_name(name) ⇒ Object 



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# File 'lib/logtail-rack/http_events.rb', line 121

def normalize_header_name(name)
  name.to_s.downcase.gsub("-", "_")
end

.silence_request ⇒ Object

Accessor method for #silence_request=



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# File 'lib/logtail-rack/http_events.rb', line 102

def silence_request
  @silence_request
end

.silence_request=(proc) ⇒ Object

This setting allows you to silence requests based on any conditions you desire. We require a block because it gives you complete control over how you want to silence requests. The first parameter being the traditional Rack env hash, the second being a [Rack Request](www.rubydoc.info/gems/rack/Rack/Request) object.

Examples:

Integrations::Rack::HTTPEvents.silence_request = lambda do |rack_env, rack_request|
  rack_request.path == "/_health"
end


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# File 'lib/logtail-rack/http_events.rb', line 93

def silence_request=(proc)
  if proc && !proc.is_a?(Proc)
    raise ArgumentError.new("The value passed to #silence_request must be a Proc")
  end

  @silence_request = proc
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/logtail-rack/http_events.rb', line 128

def call(env)
  request = Util::Request.new(env)

  if silenced?(env, request)
    if Config.instance.logger.respond_to?(:silence)
      Config.instance.logger.silence do
        @app.call(env)
      end
    else
      @app.call(env)
    end

  elsif collapse_into_single_event?
    request_start = Time.now
    status, headers, body = @app.call(env)
    request_end = Time.now

    Config.instance.logger.info do
      http_context = CurrentContext.fetch(:http)
      content_length = safe_to_i(headers[CONTENT_LENGTH_KEY])
      duration_ms = (request_end - request_start) * 1000.0

      http_response = HTTPResponse.new(
        content_length: content_length,
        headers: filter_http_headers(headers),
        http_context: http_context,
        request_id: request.request_id,
        status: status,
        duration_ms: duration_ms,
      )

      {
        message: http_response.message,
        event: {
          http_response_sent: {
            body: http_response.body,
            content_length: http_response.content_length,
            headers_json: http_response.headers_json,
            request_id: http_response.request_id,
            service_name: http_response.service_name,
            status: http_response.status,
            duration_ms: http_response.duration_ms,
          }
        }
      }
    end

    [status, headers, body]
  else
    Config.instance.logger.info do
      event_body = capture_request_body? ? request.body_content : nil
      http_request = HTTPRequest.new(
        body: event_body,
        content_length: safe_to_i(request.content_length),
        headers: filter_http_headers(request.headers),
        host: Util::Encoding.force_utf8_encoding(request.host),
        method: request.request_method,
        path: request.path,
        port: request.port,
        query_string: Util::Encoding.force_utf8_encoding(request.query_string),
        request_id: request.request_id,
        scheme: Util::Encoding.force_utf8_encoding(request.scheme),
      )

      {
        message: http_request.message,
        event: {
          http_request_received: {
            body: http_request.body,
            content_length: http_request.content_length,
            headers_json: http_request.headers_json,
            host: http_request.host,
            method: http_request.method,
            path: http_request.path,
            port: http_request.port,
            query_string: http_request.query_string,
            request_id: http_request.request_id,
            scheme: http_request.scheme,
            service_name: http_request.service_name,
          }
        }
      }
    end

    request_start = Time.now
    status, headers, body = @app.call(env)
    request_end = Time.now

    Config.instance.logger.info do
      event_body = capture_response_body? ? body : nil
      content_length = safe_to_i(headers[CONTENT_LENGTH_KEY])
      duration_ms = (request_end - request_start) * 1000.0

      http_response = HTTPResponse.new(
        body: event_body,
        content_length: content_length,
        headers: filter_http_headers(headers),
        request_id: request.request_id,
        status: status,
        duration_ms: duration_ms,
      )

      {
        message: http_response.message,
        event: {
          http_response_sent: {
            body: http_response.body,
            content_length: http_response.content_length,
            headers_json: http_response.headers_json,
            request_id: http_response.request_id,
            service_name: http_response.service_name,
            status: http_response.status,
            duration_ms: http_response.duration_ms,
          }
        }
      }
    end

    [status, headers, body]
  end
end