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Suppress Interrupt exception for stdio server

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This PR suppresses the following backtrace of `Interrupt` (Ctrl+c) exception for stdio server:

## Before

```console
$ ./examples/stdio_server.rb
^C/Users/koic/src/github.com/modelcontextprotocol/ruby-sdk/lib/mcp/server/transports/stdio_transport.rb:20:
in 'IO#gets': Interrupt
        from /Users/koic/src/github.com/modelcontextprotocol/ruby-sdk/lib/mcp/server/transports/stdio_transport.rb:20:
             in 'MCP::Server::Transports::StdioTransport#open'
        from ./examples/stdio_server.rb:95:in '<main>'
$ echo $?
130
```

## After

```console
$ ./examples/stdio_server.rb
^C
Exiting...
$ echo $?
130
```

This change should prevent unexpected backtrace from appearing when running the example:
https://github.com/modelcontextprotocol/ruby-sdk?tab=readme-ov-file#stdio-transport
This commit is contained in:
Koichi ITO 2025-06-07 19:25:15 +09:00
commit 85252e0546
1 changed files with 6 additions and 0 deletions
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6
lib/mcp/server/transports/stdio_transport.rb
View file

@ -7,6 +7,8 @@ module MCP
class Server class Server
module Transports module Transports
class StdioTransport < Transport class StdioTransport < Transport
STATUS_INTERRUPTED = Signal.list["INT"] + 128
def initialize(server) def initialize(server)
@server = server @server = server
@open = false @open = false
@ -20,6 +22,10 @@ module MCP
while @open && (line = $stdin.gets) while @open && (line = $stdin.gets)
handle_json_request(line.strip) handle_json_request(line.strip)
end end
rescue Interrupt
warn("\nExiting...")
exit(STATUS_INTERRUPTED)
end end
def close def close