Add Event Bus (#184)

Major internal refactor to use an event bus to pass event/messages along. These changes are largely invisible user facing but sets up internal design for real time stats and information.

- `--watch-config` logic refactored for events
- remove multiple SSE api endpoints, replaced with /api/events
- keep all functionality essentially the same
- UI/backend sync is in near real time now

README.md

@@ -72,9 +72,7 @@ See the [configuration documentation](https://github.com/mostlygeek/llama-swap/w
 
 llama-swap ships with a web based interface to make it easier to monitor logs and check the status of models. 
 
-<img width="1854" alt="image" src="https://github.com/user-attachments/assets/ee0025f0-f031-4158-9b5d-cd98b2b9fe4d" />
-
-
+<img width="1758" alt="image" src="https://github.com/user-attachments/assets/31ae5bcd-5efd-46b0-b64b-6db9e60196d3" />
 
 ## Docker Install ([download images](https://github.com/mostlygeek/llama-swap/pkgs/container/llama-swap))
 

config.example.yaml

@@ -49,7 +49,19 @@ models:
     cmd: |
       # ${latest-llama} is a macro that is defined above
       ${latest-llama}
-      --model path/to/Qwen2.5-1.5B-Instruct-Q4_K_M.gguf
+      --model path/to/llama-8B-Q4_K_M.gguf
+
+    # name: a display name for the model
+    # - optional, default: empty string
+    # - if set, it will be used in the v1/models API response
+    # - if not set, it will be omitted in the JSON model record
+    name: "llama 3.1 8B"
+
+    # description: a description for the model
+    # - optional, default: empty string
+    # - if set, it will be used in the v1/models API response
+    # - if not set, it will be omitted in the JSON model record
+    description: "A small but capable model used for quick testing"
 
     # env: define an array of environment variables to inject into cmd's environment
     # - optional, default: empty array

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/tidwall/gjson v1.18.0
 	github.com/tidwall/sjson v1.2.5
 	gopkg.in/yaml.v3 v3.0.1
+	github.com/kelindar/event v1.5.2
 )
 
 require (

go.sum

@@ -36,6 +36,8 @@ github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaU
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/kelindar/event v1.5.2 h1:qtgssZqMh/QQMCIxlbx4wU3DoMHOrJXKdiZhphJ4YbY=
+github.com/kelindar/event v1.5.2/go.mod h1:UxWPQjWK8u0o9Z3ponm2mgREimM95hm26/M9z8F488Q=
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.2.7 h1:ZWSB3igEs+d0qvnxR/ZBzXVmxkgt8DdzP6m9pfuVLDM=
 github.com/klauspost/cpuid/v2 v2.2.7/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=

llama-swap.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/fsnotify/fsnotify"
 	"github.com/gin-gonic/gin"
+	"github.com/kelindar/event"
 	"github.com/mostlygeek/llama-swap/proxy"
 )
 
@@ -53,137 +54,129 @@ func main() {
 		gin.SetMode(gin.ReleaseMode)
 	}
 
-	proxyManager := proxy.New(config)
-
 	// Setup channels for server management
-	reloadChan := make(chan *proxy.ProxyManager)
 	exitChan := make(chan struct{})
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
 
 	// Create server with initial handler
 	srv := &http.Server{
-		Addr:    *listenStr,
-		Handler: proxyManager,
+		Addr: *listenStr,
 	}
 
+	// Support for watching config and reloading when it changes
+	reloadProxyManager := func() {
+		if currentPM, ok := srv.Handler.(*proxy.ProxyManager); ok {
+			config, err = proxy.LoadConfig(*configPath)
+			if err != nil {
+				fmt.Printf("Warning, unable to reload configuration: %v\n", err)
+				return
+			}
+
+			fmt.Println("Configuration Changed")
+			currentPM.Shutdown()
+			srv.Handler = proxy.New(config)
+			fmt.Println("Configuration Reloaded")
+
+			// wait a few seconds and tell any UI to reload
+			time.AfterFunc(3*time.Second, func() {
+				event.Emit(proxy.ConfigFileChangedEvent{
+					ReloadingState: proxy.ReloadingStateEnd,
+				})
+			})
+		} else {
+			config, err = proxy.LoadConfig(*configPath)
+			if err != nil {
+				fmt.Printf("Error, unable to load configuration: %v\n", err)
+				os.Exit(1)
+			}
+			srv.Handler = proxy.New(config)
+		}
+	}
+
+	// load the initial proxy manager
+	reloadProxyManager()
+	debouncedReload := debounce(time.Second, reloadProxyManager)
+	if *watchConfig {
+		defer event.On(func(e proxy.ConfigFileChangedEvent) {
+			if e.ReloadingState == proxy.ReloadingStateStart {
+				debouncedReload()
+			}
+		})()
+
+		fmt.Println("Watching Configuration for changes")
+		go func() {
+			absConfigPath, err := filepath.Abs(*configPath)
+			if err != nil {
+				fmt.Printf("Error getting absolute path for watching config file: %v\n", err)
+				return
+			}
+			watcher, err := fsnotify.NewWatcher()
+			if err != nil {
+				fmt.Printf("Error creating file watcher: %v. File watching disabled.\n", err)
+				return
+			}
+
+			err = watcher.Add(absConfigPath)
+			if err != nil {
+				fmt.Printf("Error adding config path (%s) to watcher: %v. File watching disabled.", absConfigPath, err)
+				return
+			}
+
+			defer watcher.Close()
+			for {
+				select {
+				case changeEvent := <-watcher.Events:
+					if changeEvent.Name == absConfigPath && (changeEvent.Has(fsnotify.Write) || changeEvent.Has(fsnotify.Create) || changeEvent.Has(fsnotify.Remove)) {
+						event.Emit(proxy.ConfigFileChangedEvent{
+							ReloadingState: proxy.ReloadingStateStart,
+						})
+					}
+
+				case err := <-watcher.Errors:
+					log.Printf("File watcher error: %v", err)
+				}
+			}
+		}()
+	}
+
+	// shutdown on signal
+	go func() {
+		sig := <-sigChan
+		fmt.Printf("Received signal %v, shutting down...\n", sig)
+		ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+		defer cancel()
+
+		if pm, ok := srv.Handler.(*proxy.ProxyManager); ok {
+			pm.Shutdown()
+		} else {
+			fmt.Println("srv.Handler is not of type *proxy.ProxyManager")
+		}
+
+		if err := srv.Shutdown(ctx); err != nil {
+			fmt.Printf("Server shutdown error: %v\n", err)
+		}
+		close(exitChan)
+	}()
+
 	// Start server
 	fmt.Printf("llama-swap listening on %s\n", *listenStr)
 	go func() {
 		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			fmt.Printf("Fatal server error: %v\n", err)
-			close(exitChan)
+			log.Fatalf("Fatal server error: %v\n", err)
 		}
 	}()
 
-	// Handle config reloads and signals
-	go func() {
-		currentManager := proxyManager
-		for {
-			select {
-			case newManager := <-reloadChan:
-				log.Println("Config change detected, waiting for in-flight requests to complete...")
-				// Stop old manager processes gracefully (this waits for in-flight requests)
-				currentManager.StopProcesses(proxy.StopWaitForInflightRequest)
-				// Now do a full shutdown to clear the process map
-				currentManager.Shutdown()
-				currentManager = newManager
-				srv.Handler = newManager
-				log.Println("Server handler updated with new config")
-			case sig := <-sigChan:
-				fmt.Printf("Received signal %v, shutting down...\n", sig)
-				ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-				defer cancel()
-				currentManager.Shutdown()
-				if err := srv.Shutdown(ctx); err != nil {
-					fmt.Printf("Server shutdown error: %v\n", err)
-				}
-				close(exitChan)
-				return
-			}
-		}
-	}()
-
-	// Start file watcher if requested
-	if *watchConfig {
-		absConfigPath, err := filepath.Abs(*configPath)
-		if err != nil {
-			log.Printf("Error getting absolute path for config: %v. File watching disabled.", err)
-		} else {
-			go watchConfigFileWithReload(absConfigPath, reloadChan)
-		}
-	}
-
 	// Wait for exit signal
 	<-exitChan
 }
 
-// watchConfigFileWithReload monitors the configuration file and sends new ProxyManager instances through reloadChan.
-func watchConfigFileWithReload(configPath string, reloadChan chan<- *proxy.ProxyManager) {
-	watcher, err := fsnotify.NewWatcher()
-	if err != nil {
-		log.Printf("Error creating file watcher: %v. File watching disabled.", err)
-		return
-	}
-	defer watcher.Close()
-
-	err = watcher.Add(configPath)
-	if err != nil {
-		log.Printf("Error adding config path (%s) to watcher: %v. File watching disabled.", configPath, err)
-		return
-	}
-
-	log.Printf("Watching config file for changes: %s", configPath)
-
-	var debounceTimer *time.Timer
-	debounceDuration := 2 * time.Second
-
-	for {
-		select {
-		case event, ok := <-watcher.Events:
-			if !ok {
-				return
-			}
-			// We only care about writes to the specific config file
-			if event.Name == configPath && event.Has(fsnotify.Write) {
-				// Reset or start the debounce timer
-				if debounceTimer != nil {
-					debounceTimer.Stop()
-				}
-				debounceTimer = time.AfterFunc(debounceDuration, func() {
-					log.Printf("Config file modified: %s, reloading...", event.Name)
-
-					// Try up to 3 times with exponential backoff
-					var newConfig proxy.Config
-					var err error
-					for retries := 0; retries < 3; retries++ {
-						// Load new configuration
-						newConfig, err = proxy.LoadConfig(configPath)
-						if err == nil {
-							break
-						}
-						log.Printf("Error loading new config (attempt %d/3): %v", retries+1, err)
-						if retries < 2 {
-							time.Sleep(time.Duration(1<<retries) * time.Second)
-						}
-					}
-					if err != nil {
-						log.Printf("Failed to load new config after retries: %v", err)
-						return
-					}
-
-					// Create new ProxyManager with new config
-					newPM := proxy.New(newConfig)
-					reloadChan <- newPM
-					log.Println("Config reloaded successfully")
-				})
-			}
-		case err, ok := <-watcher.Errors:
-			if !ok {
-				log.Println("File watcher error channel closed.")
-				return
-			}
-			log.Printf("File watcher error: %v", err)
+func debounce(interval time.Duration, f func()) func() {
+	var timer *time.Timer
+	return func() {
+		if timer != nil {
+			timer.Stop()
 		}
+		timer = time.AfterFunc(interval, f)
 	}
 }

proxy/config.go

@@ -28,6 +28,10 @@ type ModelConfig struct {
 	Unlisted      bool     `yaml:"unlisted"`
 	UseModelName  string   `yaml:"useModelName"`
 
+	// #179 for /v1/models
+	Name        string `yaml:"name"`
+	Description string `yaml:"description"`
+
 	// Limit concurrency of HTTP requests to process
 	ConcurrencyLimit int `yaml:"concurrencyLimit"`
 
@@ -48,6 +52,8 @@ func (m *ModelConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		Unlisted:         false,
 		UseModelName:     "",
 		ConcurrencyLimit: 0,
+		Name:             "",
+		Description:      "",
 	}
 
 	// the default cmdStop to taskkill /f /t /pid ${PID}

proxy/config_posix_test.go

@@ -104,6 +104,8 @@ models:
   model1:
     cmd: path/to/cmd --arg1 one
     proxy: "http://localhost:8080"
+    name: "Model 1"
+    description: "This is model 1"
     aliases:
       - "m1"
       - "model-one"
@@ -168,6 +170,8 @@ groups:
 				Aliases:       []string{"m1", "model-one"},
 				Env:           []string{"VAR1=value1", "VAR2=value2"},
 				CheckEndpoint: "/health",
+				Name:          "Model 1",
+				Description:   "This is model 1",
 			},
 			"model2": {
 				Cmd:           "path/to/server --arg1 one",

proxy/events.go

@@ -0,0 +1,49 @@
+package proxy
+
+// package level registry of the different event types
+
+const ProcessStateChangeEventID = 0x01
+const ChatCompletionStatsEventID = 0x02
+const ConfigFileChangedEventID = 0x03
+const LogDataEventID = 0x04
+
+type ProcessStateChangeEvent struct {
+	ProcessName string
+	NewState    ProcessState
+	OldState    ProcessState
+}
+
+func (e ProcessStateChangeEvent) Type() uint32 {
+	return ProcessStateChangeEventID
+}
+
+type ChatCompletionStats struct {
+	TokensGenerated int
+}
+
+func (e ChatCompletionStats) Type() uint32 {
+	return ChatCompletionStatsEventID
+}
+
+type ReloadingState int
+
+const (
+	ReloadingStateStart ReloadingState = iota
+	ReloadingStateEnd
+)
+
+type ConfigFileChangedEvent struct {
+	ReloadingState ReloadingState
+}
+
+func (e ConfigFileChangedEvent) Type() uint32 {
+	return ConfigFileChangedEventID
+}
+
+type LogDataEvent struct {
+	Data []byte
+}
+
+func (e LogDataEvent) Type() uint32 {
+	return LogDataEventID
+}

proxy/logMonitor.go

@@ -2,10 +2,13 @@ package proxy
 
 import (
 	"container/ring"
+	"context"
 	"fmt"
 	"io"
 	"os"
 	"sync"
+
+	"github.com/kelindar/event"
 )
 
 type LogLevel int
@@ -18,7 +21,7 @@ const (
 )
 
 type LogMonitor struct {
-	clients  map[chan []byte]bool
+	eventbus *event.Dispatcher
 	mu       sync.RWMutex
 	buffer   *ring.Ring
 	bufferMu sync.RWMutex
@@ -37,11 +40,11 @@ func NewLogMonitor() *LogMonitor {
 
 func NewLogMonitorWriter(stdout io.Writer) *LogMonitor {
 	return &LogMonitor{
-		clients: make(map[chan []byte]bool),
-		buffer:  ring.New(10 * 1024), // keep 10KB of buffered logs
-		stdout:  stdout,
-		level:   LevelInfo,
-		prefix:  "",
+		eventbus: event.NewDispatcher(),
+		buffer:   ring.New(10 * 1024), // keep 10KB of buffered logs
+		stdout:   stdout,
+		level:    LevelInfo,
+		prefix:   "",
 	}
 }
 
@@ -81,34 +84,14 @@ func (w *LogMonitor) GetHistory() []byte {
 	return history
 }
 
-func (w *LogMonitor) Subscribe() chan []byte {
-	w.mu.Lock()
-	defer w.mu.Unlock()
-
-	ch := make(chan []byte, 100)
-	w.clients[ch] = true
-	return ch
-}
-
-func (w *LogMonitor) Unsubscribe(ch chan []byte) {
-	w.mu.Lock()
-	defer w.mu.Unlock()
-
-	delete(w.clients, ch)
-	close(ch)
+func (w *LogMonitor) OnLogData(callback func(data []byte)) context.CancelFunc {
+	return event.Subscribe(w.eventbus, func(e LogDataEvent) {
+		callback(e.Data)
+	})
 }
 
 func (w *LogMonitor) broadcast(msg []byte) {
-	w.mu.RLock()
-	defer w.mu.RUnlock()
-
-	for client := range w.clients {
-		select {
-		case client <- msg:
-		default:
-			// If client buffer is full, skip
-		}
-	}
+	event.Publish(w.eventbus, LogDataEvent{Data: msg})
 }
 
 func (w *LogMonitor) SetPrefix(prefix string) {

proxy/logMonitor_test.go

@@ -10,38 +10,29 @@ import (
 func TestLogMonitor(t *testing.T) {
 	logMonitor := NewLogMonitorWriter(io.Discard)
 
-	// Test subscription
-	client1 := logMonitor.Subscribe()
-	client2 := logMonitor.Subscribe()
-
-	defer logMonitor.Unsubscribe(client1)
-	defer logMonitor.Unsubscribe(client2)
+	// A WaitGroup is used to wait for all the expected writes to complete
+	var wg sync.WaitGroup
 
 	client1Messages := make([]byte, 0)
 	client2Messages := make([]byte, 0)
 
-	var wg sync.WaitGroup
-	wg.Add(1)
+	defer logMonitor.OnLogData(func(data []byte) {
+		client1Messages = append(client1Messages, data...)
+		wg.Done()
+	})()
 
-	go func() {
-		defer wg.Done()
-		for {
-			select {
-			case data := <-client1:
-				client1Messages = append(client1Messages, data...)
-			case data := <-client2:
-				client2Messages = append(client2Messages, data...)
-			default:
-				return
-			}
-		}
-	}()
+	defer logMonitor.OnLogData(func(data []byte) {
+		client2Messages = append(client2Messages, data...)
+		wg.Done()
+	})()
+
+	wg.Add(6) // 2 x 3 writes
 
 	logMonitor.Write([]byte("1"))
 	logMonitor.Write([]byte("2"))
 	logMonitor.Write([]byte("3"))
 
-	// Wait for the goroutine to finish
+	// wait for all writes to complete
 	wg.Wait()
 
 	// Check the buffer

proxy/process.go

@@ -13,6 +13,8 @@ import (
 	"sync"
 	"syscall"
 	"time"
+
+	"github.com/kelindar/event"
 )
 
 type ProcessState string
@@ -127,6 +129,7 @@ func (p *Process) swapState(expectedState, newState ProcessState) (ProcessState,
 
 	p.state = newState
 	p.proxyLogger.Debugf("<%s> swapState() State transitioned from %s to %s", p.ID, expectedState, newState)
+	event.Emit(ProcessStateChangeEvent{ProcessName: p.ID, NewState: newState, OldState: expectedState})
 	return p.state, nil
 }
 

proxy/proxymanager.go

@@ -2,7 +2,7 @@ package proxy
 
 import (
 	"bytes"
-	"encoding/json"
+	"context"
 	"fmt"
 	"io"
 	"mime/multipart"
@@ -34,6 +34,10 @@ type ProxyManager struct {
 	muxLogger      *LogMonitor
 
 	processGroups map[string]*ProcessGroup
+
+	// shutdown signaling
+	shutdownCtx    context.Context
+	shutdownCancel context.CancelFunc
 }
 
 func New(config Config) *ProxyManager {
@@ -64,6 +68,8 @@ func New(config Config) *ProxyManager {
 		upstreamLogger.SetLogLevel(LevelInfo)
 	}
 
+	shutdownCtx, shutdownCancel := context.WithCancel(context.Background())
+
 	pm := &ProxyManager{
 		config:    config,
 		ginEngine: gin.New(),
@@ -73,6 +79,9 @@ func New(config Config) *ProxyManager {
 		upstreamLogger: upstreamLogger,
 
 		processGroups: make(map[string]*ProcessGroup),
+
+		shutdownCtx:    shutdownCtx,
+		shutdownCancel: shutdownCancel,
 	}
 
 	// create the process groups
@@ -158,9 +167,7 @@ func (pm *ProxyManager) setupGinEngine() {
 	// in proxymanager_loghandlers.go
 	pm.ginEngine.GET("/logs", pm.sendLogsHandlers)
 	pm.ginEngine.GET("/logs/stream", pm.streamLogsHandler)
-	pm.ginEngine.GET("/logs/streamSSE", pm.streamLogsHandlerSSE)
 	pm.ginEngine.GET("/logs/stream/:logMonitorID", pm.streamLogsHandler)
-	pm.ginEngine.GET("/logs/streamSSE/:logMonitorID", pm.streamLogsHandlerSSE)
 
 	/**
 	 * User Interface Endpoints
@@ -262,6 +269,7 @@ func (pm *ProxyManager) Shutdown() {
 		}(processGroup)
 	}
 	wg.Wait()
+	pm.shutdownCancel()
 }
 
 func (pm *ProxyManager) swapProcessGroup(requestedModel string) (*ProcessGroup, string, error) {
@@ -289,32 +297,41 @@ func (pm *ProxyManager) swapProcessGroup(requestedModel string) (*ProcessGroup,
 }
 
 func (pm *ProxyManager) listModelsHandler(c *gin.Context) {
-	data := []interface{}{}
+	data := make([]gin.H, 0, len(pm.config.Models))
+	createdTime := time.Now().Unix()
+
 	for id, modelConfig := range pm.config.Models {
 		if modelConfig.Unlisted {
 			continue
 		}
 
-		data = append(data, map[string]interface{}{
+		record := gin.H{
 			"id":       id,
 			"object":   "model",
-			"created":  time.Now().Unix(),
+			"created":  createdTime,
 			"owned_by": "llama-swap",
-		})
+		}
+
+		if name := strings.TrimSpace(modelConfig.Name); name != "" {
+			record["name"] = name
+		}
+		if desc := strings.TrimSpace(modelConfig.Description); desc != "" {
+			record["description"] = desc
+		}
+
+		data = append(data, record)
 	}
 
-	// Set the Content-Type header to application/json
-	c.Header("Content-Type", "application/json")
-
-	if origin := c.Request.Header.Get("Origin"); origin != "" {
+	// Set CORS headers if origin exists
+	if origin := c.GetHeader("Origin"); origin != "" {
 		c.Header("Access-Control-Allow-Origin", origin)
 	}
 
-	// Encode the data as JSON and write it to the response writer
-	if err := json.NewEncoder(c.Writer).Encode(map[string]interface{}{"object": "list", "data": data}); err != nil {
-		pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error encoding JSON %s", err.Error()))
-		return
-	}
+	// Use gin's JSON method which handles content-type and encoding
+	c.JSON(http.StatusOK, gin.H{
+		"object": "list",
+		"data":   data,
+	})
 }
 
 func (pm *ProxyManager) proxyToUpstream(c *gin.Context) {

proxy/proxymanager_api.go

@@ -1,25 +1,28 @@
 package proxy
 
 import (
+	"context"
+	"encoding/json"
 	"net/http"
 	"sort"
-	"time"
 
 	"github.com/gin-gonic/gin"
+	"github.com/kelindar/event"
 )
 
 type Model struct {
-	Id    string `json:"id"`
-	State string `json:"state"`
+	Id          string `json:"id"`
+	Name        string `json:"name"`
+	Description string `json:"description"`
+	State       string `json:"state"`
 }
 
 func addApiHandlers(pm *ProxyManager) {
 	// Add API endpoints for React to consume
 	apiGroup := pm.ginEngine.Group("/api")
 	{
-		apiGroup.GET("/models", pm.apiListModels)
-		apiGroup.GET("/modelsSSE", pm.apiListModelsSSE)
 		apiGroup.POST("/models/unload", pm.apiUnloadAllModels)
+		apiGroup.GET("/events", pm.apiSendEvents)
 	}
 }
 
@@ -65,37 +68,102 @@ func (pm *ProxyManager) getModelStatus() []Model {
 			}
 		}
 		models = append(models, Model{
-			Id:    modelID,
-			State: state,
+			Id:          modelID,
+			Name:        pm.config.Models[modelID].Name,
+			Description: pm.config.Models[modelID].Description,
+			State:       state,
 		})
 	}
 
 	return models
 }
 
-func (pm *ProxyManager) apiListModels(c *gin.Context) {
-	c.JSON(http.StatusOK, pm.getModelStatus())
+type messageType string
+
+const (
+	msgTypeModelStatus messageType = "modelStatus"
+	msgTypeLogData     messageType = "logData"
+)
+
+type messageEnvelope struct {
+	Type messageType `json:"type"`
+	Data string      `json:"data"`
 }
 
-// stream the models as a SSE
-func (pm *ProxyManager) apiListModelsSSE(c *gin.Context) {
+// sends a stream of different message types that happen on the server
+func (pm *ProxyManager) apiSendEvents(c *gin.Context) {
 	c.Header("Content-Type", "text/event-stream")
 	c.Header("Cache-Control", "no-cache")
 	c.Header("Connection", "keep-alive")
 	c.Header("X-Content-Type-Options", "nosniff")
 
-	notify := c.Request.Context().Done()
+	sendBuffer := make(chan messageEnvelope, 25)
+	ctx, cancel := context.WithCancel(c.Request.Context())
+	sendModels := func() {
+		data, err := json.Marshal(pm.getModelStatus())
+		if err == nil {
+			msg := messageEnvelope{Type: msgTypeModelStatus, Data: string(data)}
+			select {
+			case sendBuffer <- msg:
+			case <-ctx.Done():
+				return
+			default:
+			}
+
+		}
+	}
+
+	sendLogData := func(source string, data []byte) {
+		data, err := json.Marshal(gin.H{
+			"source": source,
+			"data":   string(data),
+		})
+		if err == nil {
+			select {
+			case sendBuffer <- messageEnvelope{Type: msgTypeLogData, Data: string(data)}:
+			case <-ctx.Done():
+				return
+			default:
+			}
+		}
+	}
+
+	/**
+	 * Send updated models list
+	 */
+	defer event.On(func(e ProcessStateChangeEvent) {
+		sendModels()
+	})()
+	defer event.On(func(e ConfigFileChangedEvent) {
+		sendModels()
+	})()
+
+	/**
+	 * Send Log data
+	 */
+	defer pm.proxyLogger.OnLogData(func(data []byte) {
+		sendLogData("proxy", data)
+	})()
+	defer pm.upstreamLogger.OnLogData(func(data []byte) {
+		sendLogData("upstream", data)
+	})()
+
+	// send initial batch of data
+	sendLogData("proxy", pm.proxyLogger.GetHistory())
+	sendLogData("upstream", pm.upstreamLogger.GetHistory())
+	sendModels()
 
-	// Stream new events
 	for {
 		select {
-		case <-notify:
+		case <-c.Request.Context().Done():
+			cancel()
 			return
-		default:
-			models := pm.getModelStatus()
-			c.SSEvent("message", models)
+		case <-pm.shutdownCtx.Done():
+			cancel()
+			return
+		case msg := <-sendBuffer:
+			c.SSEvent("message", msg)
 			c.Writer.Flush()
-			<-time.After(1000 * time.Millisecond)
 		}
 	}
 }

proxy/proxymanager_loghandlers.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"strings"
@@ -34,10 +35,7 @@ func (pm *ProxyManager) streamLogsHandler(c *gin.Context) {
 		c.String(http.StatusBadRequest, err.Error())
 		return
 	}
-	ch := logger.Subscribe()
-	defer logger.Unsubscribe(ch)
 
-	notify := c.Request.Context().Done()
 	flusher, ok := c.Writer.(http.Flusher)
 	if !ok {
 		c.AbortWithError(http.StatusInternalServerError, fmt.Errorf("streaming unsupported"))
@@ -55,57 +53,28 @@ func (pm *ProxyManager) streamLogsHandler(c *gin.Context) {
 		}
 	}
 
-	// Stream new logs
+	sendChan := make(chan []byte, 10)
+	ctx, cancel := context.WithCancel(c.Request.Context())
+	defer logger.OnLogData(func(data []byte) {
+		select {
+		case sendChan <- data:
+		case <-ctx.Done():
+			return
+		default:
+		}
+	})()
+
 	for {
 		select {
-		case msg := <-ch:
-			_, err := c.Writer.Write(msg)
-			if err != nil {
-				// just break the loop if we can't write for some reason
-				return
-			}
+		case <-c.Request.Context().Done():
+			cancel()
+			return
+		case <-pm.shutdownCtx.Done():
+			cancel()
+			return
+		case data := <-sendChan:
+			c.Writer.Write(data)
 			flusher.Flush()
-		case <-notify:
-			return
-		}
-	}
-}
-
-func (pm *ProxyManager) streamLogsHandlerSSE(c *gin.Context) {
-	c.Header("Content-Type", "text/event-stream")
-	c.Header("Cache-Control", "no-cache")
-	c.Header("Connection", "keep-alive")
-	c.Header("X-Content-Type-Options", "nosniff")
-
-	logMonitorId := c.Param("logMonitorID")
-	logger, err := pm.getLogger(logMonitorId)
-	if err != nil {
-		c.String(http.StatusBadRequest, err.Error())
-		return
-	}
-	ch := logger.Subscribe()
-	defer logger.Unsubscribe(ch)
-
-	notify := c.Request.Context().Done()
-
-	// Send history first if not skipped
-	_, skipHistory := c.GetQuery("no-history")
-	if !skipHistory {
-		history := logger.GetHistory()
-		if len(history) != 0 {
-			c.SSEvent("message", string(history))
-			c.Writer.Flush()
-		}
-	}
-
-	// Stream new logs
-	for {
-		select {
-		case msg := <-ch:
-			c.SSEvent("message", string(msg))
-			c.Writer.Flush()
-		case <-notify:
-			return
 		}
 	}
 }

proxy/proxymanager_test.go

@@ -183,11 +183,20 @@ func TestProxyManager_SwapMultiProcessParallelRequests(t *testing.T) {
 }
 
 func TestProxyManager_ListModelsHandler(t *testing.T) {
+
+	model1Config := getTestSimpleResponderConfig("model1")
+	model1Config.Name = "Model 1"
+	model1Config.Description = "Model 1 description is used for testing"
+
+	model2Config := getTestSimpleResponderConfig("model2")
+	model2Config.Name = "     " // empty whitespace only strings will get ignored
+	model2Config.Description = "  "
+
 	config := Config{
 		HealthCheckTimeout: 15,
 		Models: map[string]ModelConfig{
-			"model1": getTestSimpleResponderConfig("model1"),
-			"model2": getTestSimpleResponderConfig("model2"),
+			"model1": model1Config,
+			"model2": model2Config,
 			"model3": getTestSimpleResponderConfig("model3"),
 		},
 		LogLevel: "error",
@@ -213,6 +222,7 @@ func TestProxyManager_ListModelsHandler(t *testing.T) {
 	var response struct {
 		Data []map[string]interface{} `json:"data"`
 	}
+
 	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
 		t.Fatalf("Failed to parse JSON response: %v", err)
 	}
@@ -227,6 +237,7 @@ func TestProxyManager_ListModelsHandler(t *testing.T) {
 		"model3": {},
 	}
 
+	// make all models
 	for _, model := range response.Data {
 		modelID, ok := model["id"].(string)
 		assert.True(t, ok, "model ID should be a string")
@@ -245,6 +256,21 @@ func TestProxyManager_ListModelsHandler(t *testing.T) {
 		ownedBy, ok := model["owned_by"].(string)
 		assert.True(t, ok, "owned_by should be a string")
 		assert.Equal(t, "llama-swap", ownedBy)
+
+		// check for optional name and description
+		if modelID == "model1" {
+			name, ok := model["name"].(string)
+			assert.True(t, ok, "name should be a string")
+			assert.Equal(t, "Model 1", name)
+			description, ok := model["description"].(string)
+			assert.True(t, ok, "description should be a string")
+			assert.Equal(t, "Model 1 description is used for testing", description)
+		} else {
+			_, exists := model["name"]
+			assert.False(t, exists, "unexpected name field for model: %s", modelID)
+			_, exists = model["description"]
+			assert.False(t, exists, "unexpected description field for model: %s", modelID)
+		}
 	}
 
 	// Ensure all expected models were returned

ui/src/App.tsx

@@ -10,10 +10,10 @@ function App() {
     <Router basename="/ui/">
       <APIProvider>
         <div>
-          <nav className="bg-surface border-b border-border p-4">
-            <div className="flex items-center justify-between mx-auto px-4">
-              <h1>llama-swap</h1>
-              <div className="flex space-x-4">
+          <nav className="bg-surface border-b border-border p-2 h-[75px]">
+            <div className="flex items-center justify-between mx-auto px-4 h-full">
+              <h1 className="flex items-center p-0">llama-swap</h1>
+              <div className="flex items-center space-x-4">
                 <NavLink to="/" className={({ isActive }) => (isActive ? "navlink active" : "navlink")}>
                   Logs
                 </NavLink>

ui/src/contexts/APIProvider.tsx

@@ -6,6 +6,8 @@ const LOG_LENGTH_LIMIT = 1024 * 100; /* 100KB of log data */
 export interface Model {
   id: string;
   state: ModelStatus;
+  name: string;
+  description: string;
 }
 
 interface APIProviderType {
@@ -13,12 +15,18 @@ interface APIProviderType {
   listModels: () => Promise<Model[]>;
   unloadAllModels: () => Promise<void>;
   loadModel: (model: string) => Promise<void>;
-  enableProxyLogs: (enabled: boolean) => void;
-  enableUpstreamLogs: (enabled: boolean) => void;
-  enableModelUpdates: (enabled: boolean) => void;
+  enableAPIEvents: (enabled: boolean) => void;
   proxyLogs: string;
   upstreamLogs: string;
 }
+interface LogData {
+  source: "upstream" | "proxy";
+  data: string;
+}
+interface APIEventEnvelope {
+  type: "modelStatus" | "logData";
+  data: string;
+}
 
 const APIContext = createContext<APIProviderType | undefined>(undefined);
 type APIProviderProps = {
@@ -30,6 +38,7 @@ export function APIProvider({ children }: APIProviderProps) {
   const [upstreamLogs, setUpstreamLogs] = useState("");
   const proxyEventSource = useRef<EventSource | null>(null);
   const upstreamEventSource = useRef<EventSource | null>(null);
+  const apiEventSource = useRef<EventSource | null>(null);
 
   const [models, setModels] = useState<Model[]>([]);
   const modelStatusEventSource = useRef<EventSource | null>(null);
@@ -41,104 +50,61 @@ export function APIProvider({ children }: APIProviderProps) {
     });
   }, []);
 
-  const handleProxyMessage = useCallback(
-    (e: MessageEvent) => {
-      appendLog(e.data, setProxyLogs);
-    },
-    [proxyLogs, appendLog]
-  );
+  const enableAPIEvents = useCallback((enabled: boolean) => {
+    if (!enabled) {
+      apiEventSource.current?.close();
+      apiEventSource.current = null;
+      return;
+    }
 
-  const handleUpstreamMessage = useCallback(
-    (e: MessageEvent) => {
-      appendLog(e.data, setUpstreamLogs);
-    },
-    [appendLog]
-  );
+    let retryCount = 0;
+    const maxRetries = 3;
+    const initialDelay = 1000; // 1 second
 
-  const enableProxyLogs = useCallback(
-    (enabled: boolean) => {
-      if (enabled) {
-        let retryCount = 0;
-        const maxRetries = 3;
-        const initialDelay = 1000; // 1 second
+    const connect = () => {
+      const eventSource = new EventSource("/api/events");
 
-        const connect = () => {
-          const eventSource = new EventSource("/logs/streamSSE/proxy");
+      eventSource.onmessage = (e: MessageEvent) => {
+        try {
+          const message = JSON.parse(e.data) as APIEventEnvelope;
+          switch (message.type) {
+            case "modelStatus":
+              {
+                const models = JSON.parse(message.data) as Model[];
+                setModels(models);
+              }
+              break;
 
-          eventSource.onmessage = handleProxyMessage;
-          eventSource.onerror = () => {
-            eventSource.close();
-            if (retryCount < maxRetries) {
-              retryCount++;
-              const delay = initialDelay * Math.pow(2, retryCount - 1);
-              setTimeout(connect, delay);
+            case "logData": {
+              const logData = JSON.parse(message.data) as LogData;
+              switch (logData.source) {
+                case "proxy":
+                  appendLog(logData.data, setProxyLogs);
+                  break;
+                case "upstream":
+                  appendLog(logData.data, setUpstreamLogs);
+                  break;
+              }
             }
-          };
-
-          proxyEventSource.current = eventSource;
-        };
-
-        connect();
-      } else {
-        proxyEventSource.current?.close();
-        proxyEventSource.current = null;
-      }
-    },
-    [handleProxyMessage]
-  );
-
-  const enableUpstreamLogs = useCallback(
-    (enabled: boolean) => {
-      if (enabled) {
-        let retryCount = 0;
-        const maxRetries = 3;
-        const initialDelay = 1000; // 1 second
-
-        const connect = () => {
-          const eventSource = new EventSource("/logs/streamSSE/upstream");
-
-          eventSource.onmessage = handleUpstreamMessage;
-          eventSource.onerror = () => {
-            eventSource.close();
-            if (retryCount < maxRetries) {
-              retryCount++;
-              const delay = initialDelay * Math.pow(2, retryCount - 1);
-              setTimeout(connect, delay);
-            }
-          };
-
-          upstreamEventSource.current = eventSource;
-        };
-
-        connect();
-      } else {
-        upstreamEventSource.current?.close();
-        upstreamEventSource.current = null;
-      }
-    },
-    [handleUpstreamMessage]
-  );
-
-  const enableModelUpdates = useCallback(
-    (enabled: boolean) => {
-      if (enabled) {
-        const eventSource = new EventSource("/api/modelsSSE");
-        eventSource.onmessage = (e: MessageEvent) => {
-          try {
-            const models = JSON.parse(e.data) as Model[];
-            setModels(models);
-          } catch (e) {
-            console.error(e);
           }
-        };
-        modelStatusEventSource.current = eventSource;
-      } else {
-        modelStatusEventSource.current?.close();
-        modelStatusEventSource.current = null;
-      }
-    },
-    [setModels]
-  );
+        } catch (err) {
+          console.error(e.data, err);
+        }
+      };
+      eventSource.onerror = () => {
+        eventSource.close();
+        if (retryCount < maxRetries) {
+          retryCount++;
+          const delay = initialDelay * Math.pow(2, retryCount - 1);
+          setTimeout(connect, delay);
+        }
+      };
+
+      apiEventSource.current = eventSource;
+    };
+
+    connect();
+  }, []);
 
   useEffect(() => {
     return () => {
@@ -196,23 +162,11 @@ export function APIProvider({ children }: APIProviderProps) {
       listModels,
       unloadAllModels,
       loadModel,
-      enableProxyLogs,
-      enableUpstreamLogs,
-      enableModelUpdates,
+      enableAPIEvents,
       proxyLogs,
       upstreamLogs,
     }),
-    [
-      models,
-      listModels,
-      unloadAllModels,
-      loadModel,
-      enableProxyLogs,
-      enableUpstreamLogs,
-      enableModelUpdates,
-      proxyLogs,
-      upstreamLogs,
-    ]
+    [models, listModels, unloadAllModels, loadModel, enableAPIEvents, proxyLogs, upstreamLogs]
   );
 
   return <APIContext.Provider value={value}>{children}</APIContext.Provider>;

ui/src/lib/Utils.ts

@@ -0,0 +1,18 @@
+export function processEvalTimes(text: string) {
+  const lines = text.match(/^ *eval time.*$/gm) || [];
+
+  let totalTokens = 0;
+  let totalTime = 0;
+
+  lines.forEach((line) => {
+    const tokensMatch = line.match(/\/\s*(\d+)\s*tokens/);
+    const timeMatch = line.match(/=\s*(\d+\.\d+)\s*ms/);
+
+    if (tokensMatch) totalTokens += parseFloat(tokensMatch[1]);
+    if (timeMatch) totalTime += parseFloat(timeMatch[1]);
+  });
+
+  const avgTokensPerSecond = totalTime > 0 ? totalTokens / (totalTime / 1000) : 0;
+
+  return [lines.length, totalTokens, Math.round(avgTokensPerSecond * 100) / 100];
+}

ui/src/pages/LogViewer.tsx

@@ -3,19 +3,17 @@ import { useAPI } from "../contexts/APIProvider";
 import { usePersistentState } from "../hooks/usePersistentState";
 
 const LogViewer = () => {
-  const { proxyLogs, upstreamLogs, enableProxyLogs, enableUpstreamLogs } = useAPI();
+  const { proxyLogs, upstreamLogs, enableAPIEvents } = useAPI();
 
   useEffect(() => {
-    enableProxyLogs(true);
-    enableUpstreamLogs(true);
+    enableAPIEvents(true);
     return () => {
-      enableProxyLogs(false);
-      enableUpstreamLogs(false);
+      enableAPIEvents(false);
     };
   }, []);
 
   return (
-    <div className="flex flex-col gap-5">
+    <div className="flex flex-col gap-5" style={{ height: "calc(100vh - 125px)" }}>
       <LogPanel id="proxy" title="Proxy Logs" logData={proxyLogs} />
       <LogPanel id="upstream" title="Upstream Logs" logData={upstreamLogs} />
     </div>
@@ -30,11 +28,8 @@ interface LogPanelProps {
 }
 
 export const LogPanel = ({ id, title, logData, className }: LogPanelProps) => {
+  const [isCollapsed, setIsCollapsed] = usePersistentState(`logPanel-${id}-isCollapsed`, false);
   const [filterRegex, setFilterRegex] = useState("");
-  const [panelState, setPanelState] = usePersistentState<"hide" | "small" | "max">(
-    `logPanel-${id}-panelState`,
-    "small"
-  );
   const [fontSize, setFontSize] = usePersistentState<"xxs" | "xs" | "small" | "normal">(
     `logPanel-${id}-fontSize`,
     "normal"
@@ -60,14 +55,6 @@ export const LogPanel = ({ id, title, logData, className }: LogPanelProps) => {
     });
   }, []);
 
-  const togglePanelState = useCallback(() => {
-    setPanelState((prev) => {
-      if (prev === "small") return "max";
-      if (prev === "hide") return "small";
-      return "hide";
-    });
-  }, []);
-
   const fontSizeClass = useMemo(() => {
     switch (fontSize) {
       case "xxs":
@@ -101,20 +88,21 @@ export const LogPanel = ({ id, title, logData, className }: LogPanelProps) => {
   }, [filteredLogs]);
 
   return (
-    <div className={`bg-surface border border-border rounded-lg overflow-hidden flex flex-col ${className || ""}`}>
+    <div
+      className={`bg-surface border border-border rounded-lg overflow-hidden flex flex-col ${
+        !isCollapsed && "h-full"
+      } ${className || ""}`}
+    >
       <div className="p-4 border-b border-border bg-secondary">
         <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-4">
           {/* Title - Always full width on mobile, normal on desktop */}
-          <div className="w-full md:w-auto" onClick={togglePanelState}>
+          <div className="w-full md:w-auto" onClick={() => setIsCollapsed(!isCollapsed)}>
             <h3 className="m-0 text-lg">{title}</h3>
           </div>
 
           <div className="flex flex-col sm:flex-row gap-4 w-full md:w-auto">
             {/* Sizing Buttons - Stacks vertically on mobile */}
             <div className="flex flex-wrap gap-2">
-              <button className="btn" onClick={togglePanelState}>
-                size: {panelState}
-              </button>
               <button className="btn" onClick={toggleFontSize}>
                 font: {fontSize}
               </button>
@@ -140,14 +128,11 @@ export const LogPanel = ({ id, title, logData, className }: LogPanelProps) => {
         </div>
       </div>
 
-      {panelState !== "hide" && (
-        <div className="flex-1 bg-background font-mono text-sm leading-[1.4] p-3">
+      {!isCollapsed && (
+        <div className="flex-1 bg-background font-mono text-sm p-3 overflow-hidden">
           <pre
             ref={preTagRef}
-            className={`flex-1 p-4 overflow-y-auto whitespace-pre min-h-0 ${textWrapClass} ${fontSizeClass}`}
-            style={{
-              maxHeight: panelState === "max" ? "1500px" : "500px",
-            }}
+            className={`h-full p-4 overflow-y-auto whitespace-pre min-h-0 ${textWrapClass} ${fontSizeClass}`}
           >
             {filteredLogs}
           </pre>
@@ -156,5 +141,4 @@ export const LogPanel = ({ id, title, logData, className }: LogPanelProps) => {
     </div>
   );
 };
-
 export default LogViewer;

ui/src/pages/Models.tsx

@@ -1,17 +1,16 @@
-import { useState, useEffect, useCallback } from "react";
+import { useState, useEffect, useCallback, useMemo } from "react";
 import { useAPI } from "../contexts/APIProvider";
 import { LogPanel } from "./LogViewer";
+import { processEvalTimes } from "../lib/Utils";
 
 export default function ModelsPage() {
-  const { models, enableModelUpdates, unloadAllModels, loadModel, upstreamLogs, enableUpstreamLogs } = useAPI();
+  const { models, unloadAllModels, loadModel, upstreamLogs, enableAPIEvents } = useAPI();
   const [isUnloading, setIsUnloading] = useState(false);
 
   useEffect(() => {
-    enableModelUpdates(true);
-    enableUpstreamLogs(true);
+    enableAPIEvents(true);
     return () => {
-      enableModelUpdates(false);
-      enableUpstreamLogs(false);
+      enableAPIEvents(false);
     };
   }, []);
 
@@ -29,8 +28,12 @@ export default function ModelsPage() {
     }
   }, []);
 
+  const [totalLines, totalTokens, avgTokensPerSecond] = useMemo(() => {
+    return processEvalTimes(upstreamLogs);
+  }, [upstreamLogs]);
+
   return (
-    <div className="h-screen">
+    <div>
       <div className="flex flex-col md:flex-row gap-4">
         {/* Left Column */}
         <div className="w-full md:w-1/2 flex items-top">
@@ -52,11 +55,22 @@ export default function ModelsPage() {
                   <tr key={model.id} className="border-b hover:bg-secondary-hover border-border">
                     <td className="p-2">
                       <a href={`/upstream/${model.id}/`} className="underline" target="_blank">
-                        {model.id}
+                        {model.name !== "" ? model.name : model.id}
                       </a>
+                      {model.description != "" && (
+                        <p>
+                          <em>{model.description}</em>
+                        </p>
+                      )}
                     </td>
                     <td className="p-2">
-                      <button className="btn btn--sm" disabled={model.state !== "stopped"} onClick={() => loadModel(model.id)}>Load</button>
+                      <button
+                        className="btn btn--sm"
+                        disabled={model.state !== "stopped"}
+                        onClick={() => loadModel(model.id)}
+                      >
+                        Load
+                      </button>
                     </td>
                     <td className="p-2">
                       <span className={`status status--${model.state}`}>{model.state}</span>
@@ -69,8 +83,29 @@ export default function ModelsPage() {
         </div>
 
         {/* Right Column */}
-        <div className="w-full md:w-1/2  flex items-top">
-          <LogPanel id="modelsupstream" title="Upstream Logs" logData={upstreamLogs} className="h-full" />
+        <div className="w-full md:w-1/2 flex flex-col" style={{ height: "calc(100vh - 125px)" }}>
+          <div className="card mb-4 min-h-[250px]">
+            <h2>Log Stats</h2>
+            <p className="italic my-2">note: eval logs from llama-server</p>
+            <table className="w-full border border-gray-200">
+              <tbody>
+                <tr className="border-b border-gray-200">
+                  <td className="py-2 px-4 font-medium border-r border-gray-200">Requests</td>
+                  <td className="py-2 px-4 text-right">{totalLines}</td>
+                </tr>
+                <tr className="border-b border-gray-200">
+                  <td className="py-2 px-4 font-medium border-r border-gray-200">Total Tokens Generated</td>
+                  <td className="py-2 px-4 text-right">{totalTokens}</td>
+                </tr>
+                <tr>
+                  <td className="py-2 px-4 font-medium border-r border-gray-200">Average Tokens/Second</td>
+                  <td className="py-2 px-4 text-right">{avgTokensPerSecond}</td>
+                </tr>
+              </tbody>
+            </table>
+          </div>
+
+          <LogPanel id="modelsupstream" title="Upstream Logs" logData={upstreamLogs} />
         </div>
       </div>
     </div>