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Add visualization tool to debug image sources
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package visualize | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "net/netip" | ||
| "strings" | ||
| "sync" | ||
| ) | ||
|
|
||
| type EventStore interface { | ||
| Record(id string, peer netip.Addr, status int, mirror bool) | ||
| Dot(filter []string) string | ||
| } | ||
|
|
||
| type edge struct { | ||
| node string | ||
| status int | ||
| rootIsSource bool | ||
| } | ||
|
|
||
| type MemoryStore struct { | ||
| mx sync.RWMutex | ||
| nodes map[string]string | ||
| edges map[string]edge | ||
| } | ||
|
|
||
| func NewMemoryStore() *MemoryStore { | ||
| return &MemoryStore{ | ||
| nodes: map[string]string{}, | ||
| edges: map[string]edge{}, | ||
| } | ||
| } | ||
|
|
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| func (m *MemoryStore) Record(id string, peer netip.Addr, status int, mirror bool) { | ||
| m.mx.Lock() | ||
| defer m.mx.Unlock() | ||
|
|
||
| m.nodes[peer.String()] = peer.String() | ||
| m.edges[id] = edge{ | ||
| node: peer.String(), | ||
| status: status, | ||
| rootIsSource: mirror, | ||
| } | ||
| } | ||
|
|
||
| func (m *MemoryStore) Dot(filter []string) string { | ||
| m.mx.RLock() | ||
| defer m.mx.RUnlock() | ||
|
|
||
| if len(filter) == 0 { | ||
| return dagToDot(m.nodes, m.edges) | ||
| } | ||
| filteredNodes := map[string]string{} | ||
| filteredEdges := map[string]edge{} | ||
| for _, v := range filter { | ||
| edge, ok := m.edges[v] | ||
| if !ok { | ||
| continue | ||
| } | ||
| filteredNodes[edge.node] = edge.node | ||
| filteredEdges[v] = edge | ||
| } | ||
| return dagToDot(filteredNodes, filteredEdges) | ||
| } | ||
|
|
||
| func dagToDot(nodes map[string]string, edges map[string]edge) string { | ||
| dotNodes := []string{} | ||
| for _, v := range nodes { | ||
| node := fmt.Sprintf(`%q[label="%s"];`, v, v) | ||
| dotNodes = append(dotNodes, node) | ||
| } | ||
| dotEdges := []string{} | ||
| for _, v := range edges { | ||
| color := "" | ||
| switch v.status { | ||
| case 0: | ||
| color = "yellow" | ||
| case http.StatusOK: | ||
| color = "green" | ||
| default: | ||
| color = "red" | ||
| } | ||
|
|
||
| src := "n0" | ||
| dest := v.node | ||
| if !v.rootIsSource { | ||
| src = v.node | ||
| dest = "n0" | ||
| } | ||
|
|
||
| edge := fmt.Sprintf("%q -> %q[color=%s]", src, dest, color) | ||
| dotEdges = append(dotEdges, edge) | ||
| } | ||
|
|
||
| return fmt.Sprintf(` | ||
| digraph { | ||
| layout="circo"; | ||
| root="n0"; | ||
| n0[label="host"] | ||
| %s | ||
| %s | ||
| } | ||
| `, strings.Join(dotNodes, "\n\t"), strings.Join(dotEdges, "\n\t")) | ||
| } | ||
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