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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 +1,58 @@ | ||
| package visualize | ||
|
|
||
| import ( | ||
| "net/netip" | ||
| "sync" | ||
|
|
||
| "github.com/opencontainers/go-digest" | ||
| ) | ||
|
|
||
| type EventKind string | ||
|
|
||
| const ( | ||
| EventKindSuccess EventKind = "success" | ||
| EventKindPending EventKind = "pending" | ||
| EventKindFail EventKind = "fail" | ||
| ) | ||
|
|
||
| type Event struct { | ||
| ID string | ||
| Peer netip.AddrPort | ||
| Kind EventKind | ||
| Digest digest.Digest | ||
| } | ||
|
|
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| type EventStore interface { | ||
| Record(id string, peer netip.AddrPort, kind EventKind) | ||
| Events() []Event | ||
| } | ||
|
|
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| type MemoryStore struct { | ||
| eventsMx sync.RWMutex | ||
| events []Event | ||
| } | ||
|
|
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| func NewMemoryStore() *MemoryStore { | ||
| return &MemoryStore{ | ||
| events: []Event{}, | ||
| } | ||
| } | ||
|
|
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| func (m *MemoryStore) Record(id string, peer netip.AddrPort, kind EventKind) { | ||
| m.eventsMx.Lock() | ||
| defer m.eventsMx.Unlock() | ||
|
|
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| event := Event{ | ||
| ID: id, | ||
| Peer: peer, | ||
| Kind: kind, | ||
| } | ||
| m.events = append(m.events, event) | ||
| } | ||
|
|
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| func (m *MemoryStore) Events() []Event { | ||
| m.eventsMx.RLock() | ||
| defer m.eventsMx.RUnlock() | ||
|
|
||
| return m.events | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package visualize | ||
|
|
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| import ( | ||
| "net/http" | ||
|
|
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| "github.com/emicklei/dot" | ||
|
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| "github.com/spegel-org/spegel/internal/mux" | ||
| ) | ||
|
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| type Server struct { | ||
| eventStore EventStore | ||
| } | ||
|
|
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| func NewServer(eventStore EventStore) *Server { | ||
| return &Server{ | ||
| eventStore: eventStore, | ||
| } | ||
| } | ||
|
|
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| func (s *Server) Server(addr string) *http.Server { | ||
| srv := &http.Server{ | ||
| Addr: addr, | ||
| Handler: mux.NewServeMux(s.handle), | ||
| } | ||
| return srv | ||
| } | ||
|
|
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| func (s *Server) handle(rw mux.ResponseWriter, req *http.Request) { | ||
| switch req.URL.Path { | ||
| case "/": | ||
| s.indexHandler(rw, req) | ||
| case "/graph": | ||
| s.getGraph(rw, req) | ||
| default: | ||
| rw.WriteHeader(http.StatusNotFound) | ||
| } | ||
| } | ||
|
|
||
| func (s *Server) indexHandler(rw mux.ResponseWriter, _ *http.Request) { | ||
| index := ` | ||
| <html> | ||
| <head> | ||
| <title>Spegel</title> | ||
| <style> | ||
| .content { | ||
| width: 1110px; | ||
| margin: auto; | ||
| } | ||
| #graph { | ||
| width: 1110px; | ||
| } | ||
| </style> | ||
| <script src="https://unpkg.com/htmx.org@1.9.12"></script> | ||
| <script src="https://unpkg.com/@viz-js/viz@3.5.0/lib/viz-standalone.js"></script> | ||
| </head> | ||
| <body> | ||
| <div class="content"> | ||
| <h1>Spegel</h1> | ||
| <div id="graph-container" hx-get="/graph" hx-trigger="load, every 5s" hx-swap="none" | ||
| hx-on::after-request="updateGraph(event.detail.xhr.responseText)"> | ||
| </div> | ||
| <script> | ||
| function updateGraph(dot) { | ||
| Viz.instance().then(function (viz) { | ||
| let container = document.getElementById("graph-container"); | ||
| let newNode = viz.renderSVGElement(dot); | ||
| newNode.id = "graph" | ||
| let oldNode = document.getElementById("graph"); | ||
| if (oldNode == null) { | ||
| container.appendChild(newNode) | ||
| return | ||
| } | ||
| container.replaceChild(newNode, oldNode) | ||
| }); | ||
| } | ||
| </script> | ||
| </div> | ||
| </div> | ||
| </body> | ||
| </html> | ||
| ` | ||
| rw.Write([]byte(index)) | ||
| } | ||
|
|
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| // NOTE: image could be discoverd by peeking at the manifest content? | ||
| // NOTE: In the future we could show all nodes in the cluster? | ||
| // NOTE: Should be able to both see incoming and outgoing requests | ||
| // NOTE: Hash result to avoid generating graph over again | ||
| func (s *Server) getGraph(rw mux.ResponseWriter, _ *http.Request) { | ||
| events := s.eventStore.Events() | ||
| g := dot.NewGraph(dot.Directed) | ||
| // g.Attr("layout", "circo") | ||
| g.Attr("root", "host") | ||
| g.Attr("layout", "sfdp") | ||
| g.Attr("beautify", true) | ||
| host := g.Node("host").Attr("shape", "box") | ||
| for _, event := range events { | ||
| color := "green" | ||
| if event.Kind == EventKindFail { | ||
| color = "red" | ||
| } | ||
|
|
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| n := g.Node(event.Peer.Addr().String()).Attr("shape", "circle") | ||
| g.Edge(host, n, event.ID).Attr("color", color) | ||
| } | ||
| rw.Write([]byte(g.String())) | ||
| } | ||
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