add simple resource example

examples/servers/simple-resource/mcp_simple_resource/server.py

@@ -0,0 +1,89 @@
+import anyio
+import click
+import mcp.types as types
+from mcp.server import AnyUrl, Server
+
+
+@click.group()
+def cli():
+    pass
+
+
+@cli.command()
+@click.option("--port", default=8000, help="Port to listen on for SSE")
+@click.option(
+    "--transport",
+    type=click.Choice(["stdio", "sse"]),
+    default="stdio",
+    help="Transport type",
+)
+def main(port: int, transport: str) -> int:
+    return anyio.run(_amain, port, transport)
+
+
+SAMPLE_RESOURCES = {
+    "greeting": "Hello! This is a sample text resource.",
+    "help": "This server provides a few sample text resources for testing.",
+    "about": "This is the simple-resource MCP server implementation.",
+}
+
+
+async def _amain(port: int, transport: str) -> int:
+    app = Server("mcp-simple-resource")
+
+    @app.list_resources()
+    async def list_resources() -> list[types.Resource]:
+        return [
+            types.Resource(
+                uri=AnyUrl(f"file:///{name}.txt"),
+                name=name,
+                description=f"A sample text resource named {name}",
+                mimeType="text/plain",
+            )
+            for name in SAMPLE_RESOURCES.keys()
+        ]
+
+    @app.read_resource()
+    async def read_resource(uri: AnyUrl) -> str | bytes:
+        assert uri.path is not None
+        name = uri.path.replace(".txt", "").lstrip("/")
+
+        if name not in SAMPLE_RESOURCES:
+            raise ValueError(f"Unknown resource: {uri}")
+
+        return SAMPLE_RESOURCES[name]
+
+    if transport == "sse":
+        from mcp.server.sse import SseServerTransport
+        from starlette.applications import Starlette
+        from starlette.routing import Route
+
+        sse = SseServerTransport("/messages")
+
+        async def handle_sse(scope, receive, send):
+            async with sse.connect_sse(scope, receive, send) as streams:
+                await app.run(
+                    streams[0], streams[1], app.create_initialization_options()
+                )
+
+        async def handle_messages(scope, receive, send):
+            await sse.handle_post_message(scope, receive, send)
+
+        starlette_app = Starlette(
+            debug=True,
+            routes=[
+                Route("/sse", endpoint=handle_sse),
+                Route("/messages", endpoint=handle_messages, methods=["POST"]),
+            ],
+        )
+
+        import uvicorn
+
+        uvicorn.run(starlette_app, host="0.0.0.0", port=port)
+    else:
+        from mcp.server.stdio import stdio_server
+
+        async with stdio_server() as streams:
+            await app.run(streams[0], streams[1], app.create_initialization_options())
+
+    return 0