feat: M3 load balancing + health check (model/render/admin API status/UI)

internal/httpapi/server.go

@@ -4,9 +4,12 @@ package httpapi
 import (
 	"embed"
 	"encoding/json"
+	"fmt"
+	"io"
 	"io/fs"
 	"net/http"
 	"strings"
+	"time"
 
 	"webui4frpc/internal/process"
 	"webui4frpc/internal/store"
@@ -131,6 +134,18 @@ func contentTypeFor(name string) string {
 	}
 }
 
+// proxyState is a per-proxy status row reported by the local frpc admin
+// API (GET /api/status). Status is one of frpc's proxy phases:
+// new | wait start | start error | running | check failed | closed.
+type proxyState struct {
+	Name       string `json:"name"`
+	Type       string `json:"type"`
+	Status     string `json:"status"`
+	Err        string `json:"err,omitempty"`
+	LocalAddr  string `json:"local_addr"`
+	RemoteAddr string `json:"remote_addr"`
+}
+
 func (h *Handler) handleStatus(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodGet {
 		methodNotAllowed(w)
@@ -149,6 +164,13 @@ func (h *Handler) handleStatus(w http.ResponseWriter, r *http.Request) {
 		// ConnState is the derived frps connection state:
 		// connected | connecting | failed | not_started | disabled.
 		ConnState string `json:"connState"`
+		// AdminEnabled is true when the remote configures a local frpc admin
+		// API (adminPort > 0); then ProxyStates reflects real proxy health.
+		AdminEnabled bool         `json:"adminEnabled"`
+		ProxyStates  []proxyState `json:"proxyStates,omitempty"`
+		// GroupCount is the number of distinct LB groups across this remote's
+		// forwards (M3 display).
+		GroupCount int `json:"groupCount,omitempty"`
 	}
 
 	profiles := make([]profileStatus, 0, len(remotes))
@@ -159,10 +181,24 @@ func (h *Handler) handleStatus(w http.ResponseWriter, r *http.Request) {
 	for _, rv := range remotes {
 		st, has := h.Process.Status(rv.Name)
 		fwd, _ := h.Store.LinksForRemote(rv.Name)
-		profiles = append(profiles, profileStatus{
+		p := profileStatus{
 			Name: rv.Name, Enabled: rv.Enabled, Status: st, HasProc: has, Forwards: fwd,
-			ConnState: connStateOf(h.Process.LogPath(rv.Name), rv.Enabled, st),
-		})
+			AdminEnabled: rv.AdminPort > 0,
+			GroupCount:   groupCountOf(locals, fwd),
+		}
+		if rv.AdminPort > 0 {
+			// Query the local frpc admin API for true per-proxy state.
+			if states, err := fetchProxyStates(rv.AdminAddr, rv.AdminPort, rv.AdminUser, rv.AdminPassword); err == nil {
+				p.ProxyStates = states
+			}
+		}
+		// Prefer admin-derived conn state; fall back to log inference.
+		if p.AdminEnabled && len(p.ProxyStates) > 0 {
+			p.ConnState = connStateAdmin(p.ProxyStates)
+		} else {
+			p.ConnState = connStateOf(h.Process.LogPath(rv.Name), rv.Enabled, st)
+		}
+		profiles = append(profiles, p)
 	}
 
 	// Local status: each local plus its forwarding targets and whether each
@@ -251,6 +287,86 @@ func connStateOf(workerLog string, enabled bool, st process.Status) string {
 	}
 }
 
+// fetchProxyStates queries a worker's local frpc admin API (webServer) for
+// true per-proxy status: GET /api/status returns a map keyed by proxy type,
+// each value a list of { name, type, status, err, local_addr, remote_addr }.
+// status is one of frpc's proxy phases:
+//
+//	new | wait start | start error | running | check failed | closed
+func fetchProxyStates(addr string, port int, user, pass string) ([]proxyState, error) {
+	if addr == "" {
+		addr = "127.0.0.1"
+	}
+	url := fmt.Sprintf("http://%s:%d/api/status", addr, port)
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.SetBasicAuth(user, pass)
+	cli := &http.Client{Timeout: 3 * time.Second}
+	resp, err := cli.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		return nil, fmt.Errorf("admin status HTTP %d", resp.StatusCode)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 4<<20))
+	if err != nil {
+		return nil, err
+	}
+	var m map[string][]proxyState
+	if err := json.Unmarshal(body, &m); err != nil {
+		return nil, err
+	}
+	var out []proxyState
+	for _, arr := range m {
+		out = append(out, arr...)
+	}
+	return out, nil
+}
+
+// connStateAdmin derives the overall worker connection state from the per-proxy
+// states reported by the local frpc admin API.
+func connStateAdmin(states []proxyState) string {
+	if len(states) == 0 {
+		return "connecting"
+	}
+	anyRunning := false
+	for _, s := range states {
+		switch s.Status {
+		case "running":
+			anyRunning = true
+		case "wait start":
+			return "connecting"
+		}
+	}
+	if anyRunning {
+		return "connected"
+	}
+	return "failed"
+}
+
+// groupCountOf returns the number of distinct non-empty LB groups a remote
+// participates in, by mapping each forward's service back to its local.
+func groupCountOf(locals []store.Local, fwd []store.Forward) int {
+	groupByLocal := map[string]string{}
+	for _, l := range locals {
+		if l.LBGroup != "" {
+			groupByLocal[l.Name] = l.LBGroup
+		}
+	}
+	seen := map[string]bool{}
+	for _, f := range fwd {
+		if g := groupByLocal[f.Service]; g != "" {
+			seen[g] = true
+		}
+	}
+	return len(seen)
+}
+
 func methodNotAllowed(w http.ResponseWriter) {
 	http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
 }