Added headless build support

Makefile

@@ -12,6 +12,10 @@ all:
 	$(MAKE) -C $(SRC) unix
 	$(MAKE) dist
 
+headless:
+	$(MAKE) -C $(SRC) unix-headless
+	$(MAKE) dist
+
 win64:
 	$(MAKE) -C $(SRC) win64
 	$(MAKE) dist
@@ -20,6 +24,10 @@ win64-cross:
 	$(MAKE) -C $(SRC) CGO_ENABLED=1 CC=$(CROSSCC) CXX=$(CROSSCXX) win64
 	$(MAKE) dist
 
+win64-headless:
+	$(MAKE) -C $(SRC) win64-headless
+	$(MAKE) dist
+
 dist:
 	mkdir -p $(DIST)
 	mv $(SRC)/streamgoose* $(DIST)/

README.md

@@ -119,6 +119,12 @@ Then rerun the command from step 2.
 
 **Note**: When testing the cross-compiled build under Wine, you must have Microsoft Edge WebView2 Runtime installed in order for the GUI to work at all. You can [download](https://developer.microsoft.com/en-us/microsoft-edge/webview2) this engine directly from the Microsoft website (select "Evergreen Standalone Installer") and install it into your Wine profile. Be sure to enable at least Windows 7 emulation in winecfg.
 
+### Headless builds
+
+In case you don't want to build the GUI, you can run `make headless` and `make win64-headless` depending on the platform. In this case, a binary will be built where you'll be required to point any JS-enabled Web browser of your choice to `http://127.0.0.1:60053` to see the chat window. This can be useful when building StreamGoose on more exotic platforms not supported by the `webview_go` library.
+
+Note that the `make win64-headless` command can be run on both Linux and Windows, all cross-compilation is done transparently in this case.
+
 
 ## Usage
 

src/Makefile

@@ -2,15 +2,24 @@ LDFLAGS = -s -w
 LDFLAGS_WIN = -H windowsgui -s -w
 GOFLAGS = -trimpath
 SOURCES = server.go twitch.go youtube.go owncast.go kick.go
+SOURCES_GUI = $(SOURCES) gui.go
 BIN = streamgoose
 
 unix:
 	go mod tidy
-	go build -o $(BIN) $(GOFLAGS) -ldflags "$(LDFLAGS)" $(SOURCES)
+	go build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o $(BIN) $(SOURCES_GUI)
+
+unix-headless:
+	go mod tidy
+	go build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o $(BIN) $(SOURCES)
 
 win64:
 	go mod tidy
-	GOOS=windows GOARCH=amd64 go build -o $(BIN).exe $(GOFLAGS) -ldflags "$(LDFLAGS_WIN)" $(SOURCES)
+	GOOS=windows GOARCH=amd64 go build $(GOFLAGS) -ldflags "$(LDFLAGS_WIN)" -o $(BIN).exe $(SOURCES_GUI)
+
+win64-headless:
+	go mod tidy
+	GOOS=windows GOARCH=amd64 go build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o $(BIN).exe $(SOURCES)
 
 clean:
 	rm $(BIN)

src/gui.go

@@ -0,0 +1,31 @@
+/*
+  StreamGoose UI — Go reference implementation
+ 
+  Created by Luxferre in 2024, released into public domain
+*/
+package main
+
+import (
+  "fmt"
+  "centrifuge.hectabit.org/HectaBit/webview_go" /* for UI launch */
+)
+
+/* override GUI entry point */
+func init() {
+  goose_start_gui = func(config map[string]interface{}) {
+    /* target server listening address */
+    target_addr := fmt.Sprintf("%s:%d", config["server_listen_ip"].(string), int(config["server_port"].(float64)))
+
+    /* start the GUI */
+    debug := false
+    if _, ok := config["debug"]; ok && config["debug"].(bool) == true {
+      debug = true
+    }
+    bro := webview.New(debug) /* create a browser instance */
+    bro.SetSize(320, 720, webview.HintNone)
+    defer bro.Destroy()
+    bro.SetTitle("StreamGoose v0.0.1")
+    bro.Navigate("http://" + target_addr)
+    bro.Run()
+  }
+}

src/server.go

@@ -9,13 +9,12 @@ import (
   "os"
   "fmt"
   "log"
+  "time"
   "strings"
   "slices"
   "encoding/json"
   "net/http"
   "io/ioutil"
-  /* external */
-  "centrifuge.hectabit.org/HectaBit/webview_go" /* for UI launch */
 )
 
 /* main chat message structure */
@@ -31,7 +30,17 @@ type ChatMessage struct {
 var global_msg_id uint64 = 0 /* track global message ID */
 var message_transport chan ChatMessage  /* global message channel */
 var sse_transports []chan string /* SSE output channels */
-var bro webview.WebView /* global browser instance handle */
+
+/* headless behaviour by default */
+var goose_start_gui = func(config map[string]interface{}) {
+  /* target server listening address */
+  const fmt_str = "[headless] Connect to http://%s:%d in any browser to see the chat window"
+  log.Printf(fmt_str, config["server_listen_ip"].(string), int(config["server_port"].(float64)))
+  /* just do nothing except sleep in the main thread */
+  for {
+    time.Sleep(time.Duration(3600) * time.Second)
+  }
+}
 
 /* escape HTML entities in JS parameters */
 func esc(s string) string {
@@ -157,7 +166,6 @@ func main() {
       log.Fatal(err)
     }
   }()
-
   
   if _, ok := config["tw_backend_enabled"]; ok && config["tw_backend_enabled"].(bool) == true {
     go twitch_run(config)  /* start the Twitch backend */
@@ -175,16 +183,7 @@ func main() {
     go kick_run(config) /* start the Kick backend */
   }
 
-  /* start the GUI */
-  debug := false
-  if _, ok := config["debug"]; ok && config["debug"].(bool) == true {
-    debug = true
-  }
-  bro = webview.New(debug) /* create a browser instance */
-  bro.SetSize(320, 720, webview.HintNone)
-  defer bro.Destroy()
-  bro.SetTitle("StreamGoose v0.0.1")
-  bro.Navigate("http://" + target_addr)
-  bro.Run()
+  /* start the GUI from gui.go file */
+  goose_start_gui(config)
 
 }