2021-06-08 01:23:25 +05:30
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# frozen_string_literal: true
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module Gitlab
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module Middleware
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class Speedscope
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def initialize(app)
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@app = app
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end
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def call(env)
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request = ActionDispatch::Request.new(env)
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return @app.call(env) unless rendering_flamegraph?(request)
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body = nil
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::Gitlab::SafeRequestStore[:capturing_flamegraph] = true
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require 'stackprof'
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begin
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mode = stackprof_mode(request)
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flamegraph = ::StackProf.run(
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mode: mode,
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raw: true,
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aggregate: false,
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interval: ::Gitlab::StackProf.interval(mode)
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) do
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_, _, body = @app.call(env)
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end
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ensure
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body.close if body.respond_to?(:close)
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end
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render_flamegraph(flamegraph, request)
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end
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private
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def rendering_flamegraph?(request)
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request.params['performance_bar'] == 'flamegraph' && ::Gitlab::PerformanceBar.allowed_for_user?(request.env['warden']&.user)
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end
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def render_flamegraph(graph, request)
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headers = { 'Content-Type' => 'text/html' }
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path = request.env['PATH_INFO'].sub('//', '/')
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speedscope_path = ::Gitlab::Utils.append_path(::Gitlab.config.gitlab.relative_url_root, '/-/speedscope/index.html')
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html = <<~HTML
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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body { margin: 0; height: 100vh; }
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#speedscope-iframe { width: 100%; height: 100%; border: none; }
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</style>
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</head>
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<body>
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<script type="text/javascript" nonce="#{request.content_security_policy_nonce}">
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var graph = #{Gitlab::Json.generate(graph)};
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var json = JSON.stringify(graph);
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var blob = new Blob([json], { type: 'text/plain' });
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var objUrl = encodeURIComponent(URL.createObjectURL(blob));
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var iframe = document.createElement('IFRAME');
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iframe.setAttribute('id', 'speedscope-iframe');
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document.body.appendChild(iframe);
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var iframeUrl = '#{speedscope_path}#profileURL=' + objUrl + '&title=' + 'Flamegraph for #{CGI.escape(path)} in #{stackprof_mode(request)} mode';
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iframe.setAttribute('src', iframeUrl);
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</script>
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</body>
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</html>
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HTML
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[200, headers, [html]]
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end
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def stackprof_mode(request)
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case request.params['stackprof_mode']&.to_sym
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when :cpu
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:cpu
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when :object
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:object
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else
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:wall
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end
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end
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end
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end
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end
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