1// Copyright 2022 Google Inc. All Rights Reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package driver 16 17import ( 18 "encoding/json" 19 "html/template" 20 "net/http" 21 22 "github.com/google/pprof/internal/measurement" 23 "github.com/google/pprof/internal/report" 24) 25 26// stackView generates the flamegraph view. 27func (ui *webInterface) stackView(w http.ResponseWriter, req *http.Request) { 28 // Get all data in a report. 29 rpt, errList := ui.makeReport(w, req, []string{"svg"}, func(cfg *config) { 30 cfg.CallTree = true 31 cfg.Trim = false 32 cfg.Granularity = "filefunctions" 33 }) 34 if rpt == nil { 35 return // error already reported 36 } 37 38 // Make stack data and generate corresponding JSON. 39 stacks := rpt.Stacks() 40 b, err := json.Marshal(stacks) 41 if err != nil { 42 http.Error(w, "error serializing stacks for flame graph", 43 http.StatusInternalServerError) 44 ui.options.UI.PrintErr(err) 45 return 46 } 47 48 nodes := make([]string, len(stacks.Sources)) 49 for i, src := range stacks.Sources { 50 nodes[i] = src.FullName 51 } 52 nodes[0] = "" // root is not a real node 53 54 _, legend := report.TextItems(rpt) 55 ui.render(w, req, "stacks", rpt, errList, legend, webArgs{ 56 Stacks: template.JS(b), 57 Nodes: nodes, 58 UnitDefs: measurement.UnitTypes, 59 }) 60} 61