skywalking-booster-ui/src/views/dashboard/related/ebpf/components/EBPFStack.vue

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<template>
  <div id="graph-stack" ref="graph">
    <span class="tip" v-show="ebpfStore.tip">{{ ebpfStore.tip }}</span>
  </div>
</template>
<script lang="ts" setup>
import { ref, watch } from "vue";
import * as d3 from "d3";
import d3tip from "d3-tip";
import { flamegraph } from "d3-flame-graph";
import { useEbpfStore } from "@/store/modules/ebpf";
import { StackElement } from "@/types/ebpf";
import "d3-flame-graph/dist/d3-flamegraph.css";

/*global Nullable*/
const ebpfStore = useEbpfStore();
const stackTree = ref<Nullable<StackElement>>(null);
const graph = ref<Nullable<HTMLDivElement>>(null);
const flameChart = ref<any>(null);
const min = ref<number>(1);
const max = ref<number>(1);

function drawGraph() {
  if (flameChart.value) {
    flameChart.value.destroy();
  }
  if (!ebpfStore.analyzeTrees.length) {
    return (stackTree.value = null);
  }
  const root: StackElement = {
    parentId: "0",
    originId: "1",
    name: "Virtual Root",
    children: [],
    value: 0,
    id: "1",
    symbol: "Virtual Root",
    dumpCount: 0,
    stackType: "",
  };
  countRange();
  for (const tree of ebpfStore.analyzeTrees) {
    const ele = processTree(tree.elements);
    root.children && root.children.push(ele);
  }
  const param = (root.children || []).reduce(
    (prev: number[], curr: StackElement) => {
      prev[0] += curr.value;
      prev[1] += curr.dumpCount;
      return prev;
    },
    [0, 0]
  );
  root.value = param[0];
  root.dumpCount = param[1];
  stackTree.value = root;
  const w = (graph.value && graph.value.getBoundingClientRect().width) || 10;
  flameChart.value = flamegraph()
    .width(w - 15)
    .cellHeight(18)
    .transitionDuration(750)
    .minFrameSize(5)
    .transitionEase(d3.easeCubic as any)
    .sort(true)
    .title("")
    .selfValue(false)
    .inverted(true)
    .setColorMapper((d, originalColor) =>
      d.highlight ? "#6aff8f" : originalColor
    );
  const tip = (d3tip as any)()
    .attr("class", "d3-tip")
    .direction("w")
    .html(
      (d: { data: StackElement }) =>
        `<div class="mb-5 name">Symbol: ${d.data.name}</div><div class="mb-5">Dump Count: ${d.data.dumpCount}</div>`
    )
    .style("max-width", "500px");
  flameChart.value.tooltip(tip);
  d3.select("#graph-stack").datum(stackTree.value).call(flameChart.value);
}

function countRange() {
  const list = [];
  for (const tree of ebpfStore.analyzeTrees) {
    for (const ele of tree.elements) {
      list.push(ele.dumpCount);
    }
  }
  max.value = Math.max(...list);
  min.value = Math.min(...list);
}

function processTree(arr: StackElement[]) {
  const copyArr = (window as any).structuredClone(arr);
  const obj: any = {};
  let res = null;
  for (const item of copyArr) {
    item.parentId = String(Number(item.parentId) + 1);
    item.originId = String(Number(item.id) + 1);
    item.name = item.symbol;
    delete item.id;
    obj[item.originId] = item;
  }
  const scale = d3.scaleLinear().domain([min.value, max.value]).range([1, 200]);
  for (const item of copyArr) {
    if (item.parentId === "1") {
      const val = Number(scale(item.dumpCount).toFixed(4));
      res = item;
      res.value = val;
    }
    for (const key in obj) {
      if (item.originId === obj[key].parentId) {
        const val = Number(scale(obj[key].dumpCount).toFixed(4));

        obj[key].value = val;
        if (item.children) {
          item.children.push(obj[key]);
        } else {
          item.children = [obj[key]];
        }
      }
    }
  }
  treeForeach([res], (node: StackElement) => {
    if (node.children) {
      let val = 0;
      for (const child of node.children) {
        val = child.value + val;
      }
      node.value = node.value < val ? val : node.value;
    }
  });

  return res;
}

function treeForeach(tree: StackElement[], func: (node: StackElement) => void) {
  for (const data of tree) {
    data.children && treeForeach(data.children, func);
    func(data);
  }
  return tree;
}

watch(
  () => ebpfStore.analyzeTrees,
  () => {
    drawGraph();
  }
);
</script>
<style>
#graph-stack {
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.tip {
  display: inline-block;
  width: 100%;
  text-align: center;
  color: red;
  margin-top: 20px;
}

.name {
  word-wrap: break-word;
}
</style>