Martino Ferrari
415 lines
13 KiB
Go
415 lines
13 KiB
Go
// Package api implements the REST API handlers for uopi.
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package api
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import (
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"encoding/json"
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"errors"
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"io"
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"log/slog"
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"net/http"
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"strings"
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"github.com/uopi/uopi/internal/broker"
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"github.com/uopi/uopi/internal/datasource"
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"github.com/uopi/uopi/internal/datasource/synthetic"
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"github.com/uopi/uopi/internal/storage"
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)
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// Handler holds the dependencies shared across all API endpoints.
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type Handler struct {
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broker *broker.Broker
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synthetic *synthetic.Synthetic // nil if not enabled
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store *storage.Store
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channelFinderURL string // empty if not configured
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log *slog.Logger
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}
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// New creates an API Handler. synth may be nil if the synthetic DS is disabled.
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func New(b *broker.Broker, synth *synthetic.Synthetic, store *storage.Store, channelFinderURL string, log *slog.Logger) *Handler {
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return &Handler{broker: b, synthetic: synth, store: store, channelFinderURL: channelFinderURL, log: log}
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}
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// Register mounts all API routes onto mux under the given prefix.
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// Requires Go 1.22+ for method+path routing.
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func (h *Handler) Register(mux *http.ServeMux, prefix string) {
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mux.HandleFunc("GET "+prefix+"/datasources", h.listDataSources)
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mux.HandleFunc("GET "+prefix+"/signals", h.listSignals)
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mux.HandleFunc("GET "+prefix+"/signals/search", h.searchSignals)
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mux.HandleFunc("GET "+prefix+"/channel-finder", h.channelFinder)
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mux.HandleFunc("GET "+prefix+"/interfaces", h.listInterfaces)
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mux.HandleFunc("POST "+prefix+"/interfaces", h.createInterface)
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mux.HandleFunc("GET "+prefix+"/interfaces/{id}", h.getInterface)
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mux.HandleFunc("PUT "+prefix+"/interfaces/{id}", h.updateInterface)
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mux.HandleFunc("DELETE "+prefix+"/interfaces/{id}", h.deleteInterface)
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mux.HandleFunc("POST "+prefix+"/interfaces/{id}/clone", h.cloneInterface)
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// Synthetic signal CRUD
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mux.HandleFunc("GET "+prefix+"/synthetic", h.listSynthetic)
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mux.HandleFunc("POST "+prefix+"/synthetic", h.createSynthetic)
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mux.HandleFunc("GET "+prefix+"/synthetic/{name}", h.getSynthetic)
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mux.HandleFunc("PUT "+prefix+"/synthetic/{name}", h.updateSynthetic)
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mux.HandleFunc("DELETE "+prefix+"/synthetic/{name}", h.deleteSynthetic)
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}
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// ── /datasources ──────────────────────────────────────────────────────────────
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type dsInfo struct {
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Name string `json:"name"`
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Status string `json:"status"`
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}
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func (h *Handler) listDataSources(w http.ResponseWriter, r *http.Request) {
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sources := h.broker.DataSources()
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out := make([]dsInfo, len(sources))
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for i, ds := range sources {
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out[i] = dsInfo{Name: ds.Name(), Status: "connected"}
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}
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jsonOK(w, out)
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}
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// ── /signals ──────────────────────────────────────────────────────────────────
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type signalInfo struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Unit string `json:"unit,omitempty"`
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Description string `json:"description,omitempty"`
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DisplayLow float64 `json:"displayLow"`
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DisplayHigh float64 `json:"displayHigh"`
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Writable bool `json:"writable"`
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EnumStrings []string `json:"enumStrings,omitempty"`
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}
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func (h *Handler) listSignals(w http.ResponseWriter, r *http.Request) {
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dsName := r.URL.Query().Get("ds")
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if dsName == "" {
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jsonError(w, http.StatusBadRequest, "query parameter 'ds' is required")
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return
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}
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ds, ok := h.broker.Source(dsName)
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if !ok {
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jsonError(w, http.StatusNotFound, "unknown data source: "+dsName)
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return
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}
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metas, err := ds.ListSignals(r.Context())
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if err != nil {
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h.log.Error("list signals", "ds", dsName, "err", err)
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jsonError(w, http.StatusInternalServerError, err.Error())
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return
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}
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out := make([]signalInfo, len(metas))
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for i, m := range metas {
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out[i] = metaToSignalInfo(m)
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}
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jsonOK(w, out)
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}
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// ── /signals/search ───────────────────────────────────────────────────────────
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func (h *Handler) searchSignals(w http.ResponseWriter, r *http.Request) {
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q := strings.ToLower(r.URL.Query().Get("q"))
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dsName := r.URL.Query().Get("ds")
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var sources []datasource.DataSource
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if dsName != "" {
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ds, ok := h.broker.Source(dsName)
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if !ok {
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jsonError(w, http.StatusNotFound, "unknown data source: "+dsName)
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return
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}
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sources = []datasource.DataSource{ds}
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} else {
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sources = h.broker.DataSources()
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}
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var out []signalInfo
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for _, ds := range sources {
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metas, err := ds.ListSignals(r.Context())
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if err != nil {
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continue
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}
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for _, m := range metas {
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if q == "" || strings.Contains(strings.ToLower(m.Name), q) || strings.Contains(strings.ToLower(m.Description), q) {
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si := metaToSignalInfo(m)
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out = append(out, si)
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}
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}
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}
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if out == nil {
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out = []signalInfo{}
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}
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jsonOK(w, out)
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}
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// ── /channel-finder ───────────────────────────────────────────────────────────
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// channelFinder proxies a query to the EPICS Channel Finder service when one
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// is configured, returning a flat list of PV names. Returns 501 otherwise.
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func (h *Handler) channelFinder(w http.ResponseWriter, r *http.Request) {
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if h.channelFinderURL == "" {
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jsonError(w, http.StatusNotImplemented, "Channel Finder not configured (set channel_finder_url in config)")
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return
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}
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q := r.URL.Query().Get("q")
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cfURL := strings.TrimRight(h.channelFinderURL, "/") + "/resources/channels"
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if q != "" {
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cfURL += "?~name=*" + q + "*"
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}
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resp, err := http.Get(cfURL) //nolint:noctx
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if err != nil {
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jsonError(w, http.StatusBadGateway, "Channel Finder request failed: "+err.Error())
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return
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}
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defer resp.Body.Close()
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// Channel Finder returns JSON array of channel objects; extract names.
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var channels []struct {
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Name string `json:"name"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&channels); err != nil {
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jsonError(w, http.StatusBadGateway, "Channel Finder response parse error: "+err.Error())
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return
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}
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names := make([]string, 0, len(channels))
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for _, ch := range channels {
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if ch.Name != "" {
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names = append(names, ch.Name)
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}
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}
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jsonOK(w, names)
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}
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// ── /interfaces ───────────────────────────────────────────────────────────────
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func (h *Handler) listInterfaces(w http.ResponseWriter, r *http.Request) {
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list, err := h.store.List()
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if err != nil {
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h.log.Error("list interfaces", "err", err)
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jsonError(w, http.StatusInternalServerError, err.Error())
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return
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}
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jsonOK(w, list)
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}
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func (h *Handler) createInterface(w http.ResponseWriter, r *http.Request) {
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body, err := io.ReadAll(io.LimitReader(r.Body, 4<<20))
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if err != nil {
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jsonError(w, http.StatusBadRequest, "read body: "+err.Error())
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return
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}
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id, err := h.store.Create(body)
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if err != nil {
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h.log.Error("create interface", "err", err)
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jsonError(w, http.StatusBadRequest, err.Error())
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusCreated)
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_ = json.NewEncoder(w).Encode(map[string]string{"id": id})
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}
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func (h *Handler) getInterface(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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data, err := h.store.Get(id)
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if err != nil {
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if errors.Is(err, storage.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "interface not found: "+id)
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} else {
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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w.Header().Set("Content-Type", "application/xml")
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_, _ = w.Write(data)
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}
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func (h *Handler) updateInterface(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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body, err := io.ReadAll(io.LimitReader(r.Body, 4<<20))
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if err != nil {
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jsonError(w, http.StatusBadRequest, "read body: "+err.Error())
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return
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}
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if err := h.store.Update(id, body); err != nil {
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if errors.Is(err, storage.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "interface not found: "+id)
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} else {
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h.log.Error("update interface", "id", id, "err", err)
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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func (h *Handler) deleteInterface(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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if err := h.store.Delete(id); err != nil {
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if errors.Is(err, storage.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "interface not found: "+id)
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} else {
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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func (h *Handler) cloneInterface(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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newID, err := h.store.Clone(id)
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if err != nil {
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if errors.Is(err, storage.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "interface not found: "+id)
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} else {
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h.log.Error("clone interface", "id", id, "err", err)
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusCreated)
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_ = json.NewEncoder(w).Encode(map[string]string{"id": newID})
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}
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// ── /synthetic ────────────────────────────────────────────────────────────────
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func (h *Handler) listSynthetic(w http.ResponseWriter, _ *http.Request) {
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if h.synthetic == nil {
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jsonOK(w, []any{})
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return
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}
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jsonOK(w, h.synthetic.GetDefs())
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}
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func (h *Handler) createSynthetic(w http.ResponseWriter, r *http.Request) {
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if h.synthetic == nil {
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jsonError(w, http.StatusServiceUnavailable, "synthetic data source not enabled")
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return
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}
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var def synthetic.SignalDef
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if err := json.NewDecoder(r.Body).Decode(&def); err != nil {
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jsonError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
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return
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}
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if err := h.synthetic.AddSignal(def); err != nil {
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if errors.Is(err, datasource.ErrNotFound) {
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jsonError(w, http.StatusConflict, err.Error())
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} else {
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jsonError(w, http.StatusBadRequest, err.Error())
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}
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return
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}
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w.WriteHeader(http.StatusCreated)
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jsonOK(w, def)
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}
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func (h *Handler) getSynthetic(w http.ResponseWriter, r *http.Request) {
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if h.synthetic == nil {
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jsonError(w, http.StatusServiceUnavailable, "synthetic data source not enabled")
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return
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}
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name := r.PathValue("name")
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def, err := h.synthetic.GetSignal(name)
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if err != nil {
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if errors.Is(err, datasource.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "synthetic signal not found: "+name)
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} else {
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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jsonOK(w, def)
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}
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func (h *Handler) updateSynthetic(w http.ResponseWriter, r *http.Request) {
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if h.synthetic == nil {
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jsonError(w, http.StatusServiceUnavailable, "synthetic data source not enabled")
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return
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}
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name := r.PathValue("name")
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var def synthetic.SignalDef
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if err := json.NewDecoder(r.Body).Decode(&def); err != nil {
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jsonError(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
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return
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}
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// Ensure the name in the URL matches the body (or fill it in).
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def.Name = name
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if err := h.synthetic.UpdateSignal(def); err != nil {
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if errors.Is(err, datasource.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "synthetic signal not found: "+name)
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} else {
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jsonError(w, http.StatusBadRequest, err.Error())
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}
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return
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}
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jsonOK(w, def)
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}
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func (h *Handler) deleteSynthetic(w http.ResponseWriter, r *http.Request) {
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if h.synthetic == nil {
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jsonError(w, http.StatusServiceUnavailable, "synthetic data source not enabled")
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return
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}
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name := r.PathValue("name")
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if err := h.synthetic.RemoveSignal(name); err != nil {
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if errors.Is(err, datasource.ErrNotFound) {
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jsonError(w, http.StatusNotFound, "synthetic signal not found: "+name)
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} else {
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jsonError(w, http.StatusInternalServerError, err.Error())
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}
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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// ── Helpers ───────────────────────────────────────────────────────────────────
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func metaToSignalInfo(m datasource.Metadata) signalInfo {
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return signalInfo{
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Name: m.Name,
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Type: dataTypeName(m.Type),
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Unit: m.Unit,
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Description: m.Description,
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DisplayLow: m.DisplayLow,
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DisplayHigh: m.DisplayHigh,
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Writable: m.Writable,
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EnumStrings: m.EnumStrings,
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}
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}
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func dataTypeName(t datasource.DataType) string {
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switch t {
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case datasource.TypeFloat64:
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return "float64"
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case datasource.TypeFloat64Array:
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return "float64[]"
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case datasource.TypeString:
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return "string"
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case datasource.TypeInt64:
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return "int64"
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case datasource.TypeBool:
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return "bool"
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case datasource.TypeEnum:
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return "enum"
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default:
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return "unknown"
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}
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}
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func jsonOK(w http.ResponseWriter, v any) {
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w.Header().Set("Content-Type", "application/json")
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_ = json.NewEncoder(w).Encode(v)
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}
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func jsonError(w http.ResponseWriter, code int, message string) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(code)
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_ = json.NewEncoder(w).Encode(map[string]string{"error": message})
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}
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