719e5e7fee
## Motivation and Context The Ruby SDK uses a 1-Server-to-many-sessions model where session-specific state (`@client`, `@logging_message_notification`) is stored on the shared `Server` instance. This causes the last client to connect to overwrite state for all sessions, and requires `session_id` to be threaded through method signatures for session-scoped notifications. The Python SDK avoids this by creating a `ServerSession` per connection that wraps a shared `Server`. Each session holds its own state and naturally scopes notifications through its own stream. ### Changes - Added `MCP::ServerSession` class holding per-session state: client info, logging configuration, and a `transport` reference for session-scoped notification delivery. - `StreamableHTTPTransport#handle_initialization` creates a `ServerSession` per `initialize` request and stores it in the session hash. - `handle_regular_request` routes requests through the session's `ServerSession` instead of the shared `Server` directly. - `Server#handle` and `Server#handle_json` accept an optional `session:` keyword (`ServerSession` instance). - `Server#init` stores client info on the session when available. - `Server#configure_logging_level` stores logging config on the session. - `ServerContext` and `Progress` accept a `notification_target:` which can be either a `ServerSession` (session-scoped) or a `Server` (broadcast). No `session_id:` parameter needed. - `ServerContext#notify_progress` and `#notify_log_message` delegate to the `notification_target` without `session_id` threading. - `StdioTransport` creates a single `ServerSession` on `open`, making the session model transparent across both transports. ### Design Decision This follows the Python SDK's "shared `Server` + per-connection `Session`" pattern. The `Server` holds configuration (tools, prompts, resources, handlers). Each `ServerSession` holds per-connection state (client info, logging level, stream writer). Notifications from `ServerSession` go only to that session's stream. ## How Has This Been Tested? All existing tests pass. All conformance tests pass. Added tests verifying: - Session-scoped log notification is sent only to the originating session. - Session-scoped progress notification is sent only to the originating session. - Each session stores its own client info independently. - Each session stores its own logging level independently. - `StdioTransport#open` creates a `ServerSession` and stores client info on it. ## Breaking Change None for end users. The public API (`Server.new`, `define_tool`,`server_context.report_progress`, `server_context.notify_log_message`, etc.) is unchanged. The following internal API changes affect only SDK internals: - `ServerContext.new` now requires `notification_target:` instead of just`progress:`. - `Progress.new` now takes `notification_target:` instead of `server:`. - `Server#handle` and `Server#handle_json` accept an optional `session:` keyword.
52 lines
1.9 KiB
Ruby
52 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module MCP
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class ServerContext
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def initialize(context, progress:, notification_target:)
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@context = context
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@progress = progress
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@notification_target = notification_target
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end
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# Reports progress for the current tool operation.
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# The notification is automatically scoped to the originating session.
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#
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# @param progress [Numeric] Current progress value.
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# @param total [Numeric, nil] Total expected value.
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# @param message [String, nil] Human-readable status message.
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def report_progress(progress, total: nil, message: nil)
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@progress.report(progress, total: total, message: message)
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end
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# Sends a progress notification scoped to the originating session.
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#
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# @param progress_token [String, Integer] The token identifying the operation.
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# @param progress [Numeric] Current progress value.
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# @param total [Numeric, nil] Total expected value.
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# @param message [String, nil] Human-readable status message.
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def notify_progress(progress_token:, progress:, total: nil, message: nil)
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@notification_target.notify_progress(progress_token: progress_token, progress: progress, total: total, message: message)
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end
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# Sends a log message notification scoped to the originating session.
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#
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# @param data [Object] The log data to send.
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# @param level [String] Log level (e.g., `"debug"`, `"info"`, `"error"`).
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# @param logger [String, nil] Logger name.
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def notify_log_message(data:, level:, logger: nil)
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@notification_target.notify_log_message(data: data, level: level, logger: logger)
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end
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def method_missing(name, ...)
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if @context.respond_to?(name)
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@context.public_send(name, ...)
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else
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super
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end
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end
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def respond_to_missing?(name, include_private = false)
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@context.respond_to?(name) || super
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end
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end
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end
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