diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea14ae9 --- /dev/null +++ b/.gitignore @@ -0,0 +1,20 @@ +.DS_Store + +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib + +# Test binary, built with `go test -c` +*.test + +# Output of the go coverage tool, specifically when used with LiteIDE +*.out + +# Build output dir +build + +# Dependency directories (remove the comment below to include it) +# vendor/ diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..f11ce92 --- /dev/null +++ b/go.mod @@ -0,0 +1,12 @@ +module github.com/libp2p/go-libp2p-introspection + +go 1.13 + +require ( + github.com/gogo/protobuf v1.3.1 + github.com/gorilla/websocket v1.4.1 + github.com/imdario/mergo v0.3.8 + github.com/ipfs/go-log v1.0.1 + github.com/libp2p/go-libp2p-core v0.3.1-0.20200206170018-fbc69c15df4c + github.com/pkg/errors v0.9.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..927d138 --- /dev/null +++ b/go.sum @@ -0,0 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introspect.Introspector = (*DefaultIntrospector)(nil) + +// DefaultIntrospector is a registry of subsystem data/metrics providers and also allows +// clients to inspect the system state by calling all the providers registered with it +type DefaultIntrospector struct { + treeMu sync.RWMutex + tree *introspect.DataProviders + listenAddr []string +} + +func NewDefaultIntrospector(listenAddr []string) *DefaultIntrospector { + return &DefaultIntrospector{tree: &introspect.DataProviders{}, listenAddr: listenAddr} +} + +func (d *DefaultIntrospector) RegisterDataProviders(provs *introspect.DataProviders) error { + d.treeMu.Lock() + defer d.treeMu.Unlock() + + if err := mergo.Merge(d.tree, provs); err != nil { + return err + } + + return nil +} + +func (d *DefaultIntrospector) ListenAddrs() []string { + return d.listenAddr +} + +func (d *DefaultIntrospector) FetchFullState() (*introspectpb.State, error) { + d.treeMu.RLock() + defer d.treeMu.RUnlock() + + s := &introspectpb.State{} + + // subsystems + s.Subsystems = &introspectpb.Subsystems{} + + // version + s.Version = &introspectpb.Version{Number: introspect.ProtoVersion} + + // runtime + if d.tree.Runtime != nil { + r, err := d.tree.Runtime() + if err != nil { + return nil, errors.Wrap(err, "failed to fetch runtime info") + } + s.Runtime = r + } + + // timestamps + s.InstantTs = &types.Timestamp{Seconds: time.Now().Unix()} + // TODO Figure out the other two timestamp fields + + // connections + if d.tree.Connection != nil { + conns, err := d.tree.Connection(introspect.ConnectionQueryParams{Output: introspect.QueryOutputFull}) + if err != nil { + return nil, errors.Wrap(err, "failed to fetch connections") + } + // resolve streams on connection + if d.tree.Stream != nil { + for _, c := range conns { + var sids []introspect.StreamID + for _, s := range c.Streams.StreamIds { + sids = append(sids, introspect.StreamID(s)) + } + + sl, err := d.tree.Stream(introspect.StreamQueryParams{introspect.QueryOutputFull, sids}) + if err != nil { + return nil, errors.Wrap(err, "failed to fetch streams for connection") + } + c.Streams = sl + } + } + s.Subsystems.Connections = conns + } + + // traffic + if d.tree.Traffic != nil { + tr, err := d.tree.Traffic() + if err != nil { + return nil, errors.Wrap(err, "failed to fetch traffic") + } + s.Traffic = tr + } + + return s, nil +} diff --git a/introspection/ws_server.go b/introspection/ws_server.go new file mode 100644 index 0000000..9a9f169 --- /dev/null +++ b/introspection/ws_server.go @@ -0,0 +1,85 @@ +package introspection + +import ( + "context" + "net/http" + "time" + + "github.com/gogo/protobuf/proto" + "github.com/gorilla/websocket" + logging "github.com/ipfs/go-log" + "github.com/libp2p/go-libp2p-core/introspect" +) + +var logger = logging.Logger("introspection-server") +var upgrader = websocket.Upgrader{} + +// StartServer starts the ws introspection server with the given introspector +func StartServer(introspector introspect.Introspector) func() error { + // introspect handler + http.HandleFunc("/introspect", wsUpgrader(introspector)) + + // start server + srv := http.Server{ + // TODO Need a better strategy to select an address + Addr: introspector.ListenAddrs()[0], + } + + // start server + go func() { + if err := srv.ListenAndServe(); err != http.ErrServerClosed { + logger.Errorf("failed to start server, err=%s", err) + } + }() + + logger.Infof("server starting, listening on %s", introspector.ListenAddrs()[0]) + + return func() error { + shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + + return srv.Shutdown(shutdownCtx) + } +} + +func wsUpgrader(introspector introspect.Introspector) http.HandlerFunc { + return func(w http.ResponseWriter, rq *http.Request) { + upgrader.CheckOrigin = func(rq *http.Request) bool { return true } + wsConn, err := upgrader.Upgrade(w, rq, nil) + if err != nil { + logger.Errorf("upgrade to websocket failed, err: %s", err) + return + } + defer wsConn.Close() + + for { + // wait for client to ask for the state + mt, message, err := wsConn.ReadMessage() + if err != nil { + logger.Errorf("failed to read message from ws connection, err: %s", err) + return + } + logger.Debugf("received message from ws connection, type: %d. recv: %s", mt, message) + + // fetch the current state & marshal to bytes + state, err := introspector.FetchFullState() + if err != nil { + logger.Errorf("failed to fetch current state in introspector, err: %s", err) + return + } + + bz, err := proto.Marshal(state) + if err != nil { + logger.Errorf("failed to marshal introspector state, err: %s", err) + return + } + + // send the response + wsConn.SetWriteDeadline(time.Now().Add(10 * time.Second)) + if err = wsConn.WriteMessage(websocket.BinaryMessage, bz); err != nil { + logger.Errorf("failed to write response to ws connection, err: %s", err) + return + } + } + } +}