Class: Instana::Rack
- Inherits:
-
Object
- Object
- Instana::Rack
- Defined in:
- lib/instana/instrumentation/rack.rb
Instance Method Summary collapse
- #call(env) ⇒ Object
-
#initialize(app) ⇒ Rack
constructor
A new instance of Rack.
Constructor Details
#initialize(app) ⇒ Rack
Returns a new instance of Rack.
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# File 'lib/instana/instrumentation/rack.rb', line 7 def initialize(app) @app = app end |
Instance Method Details
#call(env) ⇒ Object
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# File 'lib/instana/instrumentation/rack.rb', line 11 def call(env) kvs = { :http => {} } kvs[:http][:method] = env['REQUEST_METHOD'] kvs[:http][:url] = ::CGI.unescape(env['PATH_INFO']) if env.key?('HTTP_HOST') kvs[:http][:host] = env['HTTP_HOST'] elsif env.key?('SERVER_NAME') kvs[:http][:host] = env['SERVER_NAME'] end if ::Instana.agent.extra_headers for custom_header in ::Instana.agent.extra_headers # Headers are available in this format: HTTP_X_CAPTURE_THIS rack_header = ('HTTP_' + custom_header.upcase).gsub('-', '_') if env.key?(rack_header) kvs["http.#{custom_header}"] = env[rack_header] end end end # Check incoming context incoming_context = {} if env.key?('HTTP_X_INSTANA_T') incoming_context[:trace_id] = ::Instana::Util.header_to_id(env['HTTP_X_INSTANA_T']) incoming_context[:span_id] = ::Instana::Util.header_to_id(env['HTTP_X_INSTANA_S']) if env.key?('HTTP_X_INSTANA_S') incoming_context[:level] = env['HTTP_X_INSTANA_L'] if env.key?('HTTP_X_INSTANA_L') end ::Instana.tracer.log_start_or_continue(:rack, {}, incoming_context) status, headers, response = @app.call(env) if ::Instana.tracer.tracing? kvs[:http][:status] = status if !status.is_a?(Integer) || status.between?(500, 511) # Because of the 5xx response, we flag this span as errored but # without a backtrace (no exception) ::Instana.tracer.log_error(nil) end # Save the IDs before the trace ends so we can place # them in the response headers in the ensure block trace_id = ::Instana.tracer.trace_id span_id = ::Instana.tracer.span_id end [status, headers, response] rescue Exception => e ::Instana.tracer.log_error(e) raise ensure if headers && ::Instana.tracer.tracing? # Set reponse headers; encode as hex string headers['X-Instana-T'] = ::Instana::Util.id_to_header(trace_id) headers['X-Instana-S'] = ::Instana::Util.id_to_header(span_id) end ::Instana.tracer.log_end(:rack, kvs) end |