Module: TraceView::Inst::HTTPClient

Defined in:
lib/traceview/inst/httpclient.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/traceview/inst/httpclient.rb', line 7

def self.included(klass)
  ::TraceView::Util.method_alias(klass, :do_request, ::HTTPClient)
  ::TraceView::Util.method_alias(klass, :do_request_async, ::HTTPClient)
  ::TraceView::Util.method_alias(klass, :do_get_stream, ::HTTPClient)
end

Instance Method Details

#do_get_stream_with_traceview(req, proxy, conn) ⇒ Object 



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# File 'lib/traceview/inst/httpclient.rb', line 105

def do_get_stream_with_traceview(req, proxy, conn)
  unless req.headers.key?("traceview.context")
    return do_get_stream_without_traceview(req, proxy, conn)
  end

  # Pickup context and delete the headers stowaway
  TraceView::Context.fromString req.headers["traceview.context"]
  req.header.delete "traceview.context"

  begin
    response = nil
    response_context = nil
    uri = req.http_header.request_uri
    method = req.http_header.request_method

    # Avoid cross host tracing for blacklisted domains
    blacklisted = TraceView::API.blacklisted?(uri.hostname)

    kvs = traceview_collect(method, uri)
    kvs['Blacklisted'] = true if blacklisted
    kvs['Async'] = 1

    TraceView::API.log_entry('httpclient', kvs)
    kvs.clear

    req_context = TraceView::Context.toString()
    req.header.add('X-Trace', req_context)

    # The core httpclient call
    result = do_get_stream_without_traceview(req, proxy, conn)

    # Older HTTPClient < 2.6.0 returns HTTPClient::Connection
    if result.is_a?(::HTTP::Message)
      response = result
    else
      response = conn.pop
    end

    response_context = response.headers['X-Trace']
    kvs['HTTPStatus'] = response.status_code

    # If we get a redirect, report the location header
    if ((300..308).to_a.include? response.status.to_i) && response.headers.key?("Location")
      kvs["Location"] = response.headers["Location"]
    end

    if response_context && !blacklisted
      TraceView::XTrace.continue_service_context(req_context, response_context)
    end

    # Older HTTPClient < 2.6.0 returns HTTPClient::Connection
    conn.push response if result.is_a?(::HTTPClient::Connection)
    result
  rescue => e
    TraceView::API.log_exception('httpclient', e)
    raise e
  ensure
    # TraceView::API.log_exit('httpclient', kvs.merge('Async' => 1))
    TraceView::API.log_exit('httpclient', kvs)
  end
end

#do_request_async_with_traceview(method, uri, query, body, header) ⇒ Object 



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# File 'lib/traceview/inst/httpclient.rb', line 89

def do_request_async_with_traceview(method, uri, query, body, header)
  if TraceView.tracing?
    # Since async is done by calling Thread.new { .. }, we somehow
    # have to pass the tracing context into that new thread.  Here
    # we stowaway the context in the request headers to be picked up
    # (and removed from req headers) in do_get_stream.
    if header.is_a?(Array)
      header.push ["traceview.context", TraceView::Context.toString]
    elsif header.is_a?(Hash)
      header['traceview.context'] = TraceView::Context.toString
    end
  end

  do_request_async_without_traceview(method, uri, query, body, header)
end

#do_request_with_traceview(method, uri, query, body, header, &block) ⇒ Object 



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# File 'lib/traceview/inst/httpclient.rb', line 38

def do_request_with_traceview(method, uri, query, body, header, &block)
  # If we're not tracing, just do a fast return.
  if !TraceView.tracing?
    return request_without_traceview(method, uri, query, body, header, &block)
  end

  begin
    response_context = nil

    # Avoid cross host tracing for blacklisted domains
    blacklisted = TraceView::API.blacklisted?(uri.hostname)

    kvs = traceview_collect(method, uri, query)
    kvs['Blacklisted'] = true if blacklisted

    TraceView::API.log_entry('httpclient', kvs)
    kvs.clear

    req_context = TraceView::Context.toString()

    # Be aware of various ways to call/use httpclient
    if header.is_a?(Array)
      header.push ["X-Trace", req_context]
    elsif header.is_a?(Hash)
      header['X-Trace'] = req_context unless blacklisted
    end

    # The core httpclient call
    response = do_request_without_traceview(method, uri, query, body, header, &block)

    response_context = response.headers['X-Trace']
    kvs['HTTPStatus'] = response.status_code

    # If we get a redirect, report the location header
    if ((300..308).to_a.include? response.status.to_i) && response.headers.key?("Location")
      kvs["Location"] = response.headers["Location"]
    end

    if response_context && !blacklisted
      TraceView::XTrace.continue_service_context(req_context, response_context)
    end

    response
  rescue => e
    TraceView::API.log_exception('httpclient', e)
    raise e
  ensure
    TraceView::API.log_exit('httpclient', kvs)
  end
end

#traceview_collect(method, uri, query = nil) ⇒ Object 



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# File 'lib/traceview/inst/httpclient.rb', line 13

def traceview_collect(method, uri, query = nil)
  kvs = {}
  kvs['IsService'] = 1

  # Conditionally log URL query params
  # Because of the hook points, the query arg can come in under <tt>query</tt>
  # or as a part of <tt>uri</tt> (not both).  Here we handle both cases.
  if TraceView::Config[:httpclient][:log_args]
    if query
      kvs['RemoteURL'] = uri.to_s + '?' + TraceView::Util.to_query(query)
    else
      kvs['RemoteURL'] = uri.to_s
    end
  else
    kvs['RemoteURL'] = uri.to_s.split('?').first
  end

  kvs['HTTPMethod'] = ::TraceView::Util.upcase(method)
  kvs['Backtrace'] = TraceView::API.backtrace if TraceView::Config[:httpclient][:collect_backtraces]
  kvs
rescue => e
  TraceView.logger.debug "[traceview/debug] Error capturing httpclient KVs: #{e.message}"
  TraceView.logger.debug e.backtrace.join('\n') if ::TraceView::Config[:verbose]
end