mirror of https://github.com/chaos-mesh/chaosd.git
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// Copyright 2020 Chaos Mesh Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"github.com/pingcap/log"
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"go.uber.org/zap"
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)
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// Edge represents an edge in graph
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type Edge struct {
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Source uint32
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Target uint32
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Next *Edge
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}
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// Graph represents a graph with link list
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type Graph struct {
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head map[uint32]*Edge
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}
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// NewGraph creates a Graph
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func NewGraph() *Graph {
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return &Graph{
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head: make(map[uint32]*Edge),
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}
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}
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// Insert inserts an Edge into a graph from source to target
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func (g *Graph) Insert(source uint32, target uint32) {
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newEdge := Edge{
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Source: source,
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Target: target,
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Next: g.head[source],
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}
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g.head[source] = &newEdge
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}
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// IterFrom starts iterating from source node
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func (g *Graph) IterFrom(source uint32) *Edge {
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return g.head[source]
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}
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// Flatten flattens the subtree from source (without checking whether it's a tree)
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func (g *Graph) Flatten(source uint32) []uint32 {
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current := g.head[source]
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var flatTree []uint32
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for {
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if current == nil {
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break
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}
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children := g.Flatten(current.Target)
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flatTree = append(flatTree, current.Target)
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flatTree = append(flatTree, children...)
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current = current.Next
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}
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log.Debug("get flatTree", zap.Uint32("source", source), zap.Uint32s("flatTree", flatTree))
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return flatTree
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}
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