EMSCRIPTEN: quick and dirty web server for testing

adding "make web" for MEGA65 and EP128 emulators which also fires up a
python based super simple web server and opens the compiled target in
preferred web browser (via xdg-open) through it

Author: lgblgblgb

build/webserver.py

@@ -0,0 +1,99 @@
+#!/usr/bin/python3
+
+import sys
+import os
+import signal
+import time
+import http.server
+import socketserver
+import daemon
+
+
+PID_FILE = "webserver.pid"
+LOG_FILE = "webserver.log"
+HTTP_PORT = 8000
+
+
+def kill_instance(pid):
+    while True:
+        try:
+            os.kill(pid, 0)
+        except OSError:
+            try:
+                os.remove(PID_FILE)
+            except FileNotFoundError:
+                pass
+            return
+        print(f"Killing previous webserver instance with pid {pid}")
+        try:
+            os.kill(pid, signal.SIGTERM)
+        except OSError:
+            pass
+        time.sleep(.1)
+
+class SafeHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
+    def send_head(self):
+        path = self.translate_path(self.path)
+        if os.path.isdir(path):
+            for index in ("index.html", "index.htm"):
+                index = os.path.join(path, index)
+                if os.path.exists(index):
+                    path = index
+                    break
+            else:
+                return self.list_directory(path)
+        if not os.path.exists(path):
+            self.send_error(404, f"File not found: {self.path}")
+            return None
+        return http.server.SimpleHTTPRequestHandler.send_head(self)
+
+class ReusableTCPServer(socketserver.TCPServer):
+    allow_reuse_address = True
+
+def run_server(port):
+    with open(PID_FILE, "w") as f:
+        f.write(str(os.getpid()))
+    with ReusableTCPServer(("", port), SafeHTTPRequestHandler) as httpd:
+        print(f"Serving HTTP on port {port}")
+        httpd.serve_forever()
+
+
+
+def main():
+    if len(sys.argv) > 1:
+        port = sys.argv[1]
+        try:
+            port = int(port)
+        except ValueError:
+            raise RuntimeError(f"Bad port value: {port}")
+    else:
+        port = 8000
+    os.chdir(os.path.dirname(sys.argv[0]))
+    os.chdir("bin")
+    try:
+        with open(PID_FILE) as pid:
+            pid = int(pid.read())
+    except FileNotFoundError:
+        pid = None
+    if pid:
+        kill_instance(pid)
+    # MAIN
+    log_file = open(LOG_FILE, "a+")
+    with daemon.DaemonContext(
+        stderr = log_file,
+        stdout = log_file,
+        working_directory = os.getcwd()
+    ):
+        try:
+            run_server(port)
+        except Exception as e:
+            try:
+                print(f"Removing pid file {PID_FILE}")
+                os.remove(PID_FILE)
+            except:
+                pass
+            raise e
+
+if __name__ == "__main__":
+    main()
+

targets/ep128/Makefile

@@ -24,4 +24,13 @@ SRCS_COMMON_xep128	= emutools.c emutools_files.c emutools_config.c emutools_gui.
 CFLAGS_TARGET_xep128	= $(SDL2_CFLAGS) $(MATH_CFLAGS) $(SOCKET_CFLAGS) $(XEMUGUI_CFLAGS) $(READLINE_CFLAGS)
 LDFLAGS_TARGET_xep128	= $(SDL2_LIBS) $(MATH_LIBS) $(SOCKET_LIBS) $(XEMUGUI_LIBS) $(READLINE_LIBS)
 
+#LDFLAGS_TARGET_xep128_ON_html = -s STACK_SIZE=655360 --preload-file=$$HOME/.local/share/xemu-lgb/ep128/exos.rom@/files/exos.rom --preload-file=$$HOME/.local/share/xemu-lgb/ep128/sdcard.img@/files/sdcard.img
+LDFLAGS_TARGET_xep128_ON_html = -s STACK_SIZE=655360 --preload-file=$$HOME/.local/share/xemu-lgb/ep128/exos.rom@/files/exos.rom
+
 include ../../build/Makefile.common
+
+web:
+	$(MAKE) ARCH=html
+	python3 ../../build/webserver.py 8000
+	sleep .1
+	xdg-open http://localhost:8000/$(PRG_TARGET).html

targets/mega65/Makefile

@@ -64,3 +64,9 @@ recreatememcontent:
 showmatrix:
 	bash $(TOPDIR)/build/m65-import-matrix2ascii.sh < $(MATRIX_TAB_VHDL)
 	bash $(TOPDIR)/build/m65-import-matrix2petscii.sh < $(MATRIX_TAB_VHDL)
+
+web:
+	$(MAKE) ARCH=html
+	python3 ../../build/webserver.py 8000
+	sleep .1
+	xdg-open http://localhost:8000/$(PRG_TARGET).html