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.
737 lines
22 KiB
Ruby
737 lines
22 KiB
Ruby
# frozen_string_literal: true
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require "test_helper"
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module MCP
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class ServerContextTest < ActiveSupport::TestCase
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test "ServerContext delegates method calls to the underlying context" do
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context = { user: "test_user" }
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progress = Progress.new(notification_target: mock, progress_token: nil)
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server_context = ServerContext.new(context, progress: progress, notification_target: mock)
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assert_equal "test_user", server_context[:user]
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end
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test "ServerContext respond_to? returns true for methods on the underlying context" do
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context = { user: "test_user" }
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progress = Progress.new(notification_target: mock, progress_token: nil)
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server_context = ServerContext.new(context, progress: progress, notification_target: mock)
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assert_respond_to server_context, :[]
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assert_respond_to server_context, :keys
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end
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test "ServerContext respond_to? returns false for methods not on the underlying context" do
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context = { user: "test_user" }
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progress = Progress.new(notification_target: mock, progress_token: nil)
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server_context = ServerContext.new(context, progress: progress, notification_target: mock)
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refute_respond_to server_context, :nonexistent_method
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end
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test "ServerContext raises NoMethodError for methods not on the underlying context" do
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context = { user: "test_user" }
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progress = Progress.new(notification_target: mock, progress_token: nil)
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server_context = ServerContext.new(context, progress: progress, notification_target: mock)
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assert_raises(NoMethodError) { server_context.nonexistent_method }
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end
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test "ServerContext delegates to custom object context" do
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context = Object.new
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def context.custom_method
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"custom_value"
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end
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progress = Progress.new(notification_target: mock, progress_token: nil)
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server_context = ServerContext.new(context, progress: progress, notification_target: mock)
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assert_equal "custom_value", server_context.custom_method
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end
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test "ServerContext#report_progress works with nil context" do
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progress = mock
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progress.expects(:report).with(50, total: 100, message: nil).once
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server_context = ServerContext.new(nil, progress: progress, notification_target: mock)
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server_context.report_progress(50, total: 100)
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end
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# Tool without server_context parameter
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class SimpleToolWithoutContext < Tool
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tool_name "simple_without_context"
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description "A tool that doesn't use server_context"
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input_schema({ properties: { message: { type: "string" } }, required: ["message"] })
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class << self
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def call(message:)
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Tool::Response.new([
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{ type: "text", content: "SimpleToolWithoutContext: #{message}" },
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])
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end
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end
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end
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# Tool with optional server_context parameter
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class ToolWithOptionalContext < Tool
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tool_name "tool_with_optional_context"
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description "A tool with optional server_context"
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input_schema({ properties: { message: { type: "string" } }, required: ["message"] })
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class << self
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def call(message:, server_context: nil)
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user = server_context.respond_to?(:[]) ? server_context[:user] : nil
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context_info = user ? "with context: #{user}" : "no context"
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Tool::Response.new([
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{ type: "text", content: "ToolWithOptionalContext: #{message} (#{context_info})" },
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])
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end
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end
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end
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# Tool with required server_context parameter
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class ToolWithRequiredContext < Tool
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tool_name "tool_with_required_context"
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description "A tool that requires server_context"
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input_schema({ properties: { message: { type: "string" } }, required: ["message"] })
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class << self
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def call(message:, server_context:)
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Tool::Response.new([
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{ type: "text", content: "ToolWithRequiredContext: #{message} for user #{server_context[:user]}" },
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])
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end
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end
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end
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setup do
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@server_with_context = Server.new(
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name: "test_server",
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tools: [SimpleToolWithoutContext, ToolWithOptionalContext, ToolWithRequiredContext],
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server_context: { user: "test_user" },
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)
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@server_without_context = Server.new(
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name: "test_server_no_context",
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tools: [SimpleToolWithoutContext, ToolWithOptionalContext],
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)
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end
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test "tool without server_context parameter works when server has context" do
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "simple_without_context",
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arguments: { message: "Hello" },
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},
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}
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response = @server_with_context.handle(request)
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assert response[:result]
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assert_equal "SimpleToolWithoutContext: Hello", response[:result][:content][0][:content]
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end
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test "tool with optional server_context receives context when server has it" do
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "tool_with_optional_context",
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arguments: { message: "Hello" },
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},
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}
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response = @server_with_context.handle(request)
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assert response[:result]
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assert_equal "ToolWithOptionalContext: Hello (with context: test_user)",
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response[:result][:content][0][:content]
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end
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test "tool with optional server_context works when server has no context" do
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "tool_with_optional_context",
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arguments: { message: "Hello" },
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},
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}
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response = @server_without_context.handle(request)
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assert response[:result]
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assert_equal "ToolWithOptionalContext: Hello (no context)",
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response[:result][:content][0][:content]
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end
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test "tool with required server_context receives context" do
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "tool_with_required_context",
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arguments: { message: "Hello" },
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},
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}
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response = @server_with_context.handle(request)
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assert response[:result]
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assert_equal "ToolWithRequiredContext: Hello for user test_user",
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response[:result][:content][0][:content]
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end
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test "tool with required server_context fails when server has no context" do
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server_no_context = Server.new(
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name: "test_server_no_context",
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tools: [ToolWithRequiredContext],
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "tool_with_required_context",
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arguments: { message: "Hello" },
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},
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}
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response = server_no_context.handle(request)
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assert_nil response[:error], "Expected no JSON-RPC error"
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assert response[:result][:isError]
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assert_equal "text", response[:result][:content][0][:type]
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assert_match(/Internal error calling tool tool_with_required_context: /, response[:result][:content][0][:text])
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end
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test "call_tool_with_args correctly detects server_context parameter presence" do
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# Tool without server_context
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refute SimpleToolWithoutContext.method(:call).parameters.any? { |_type, name| name == :server_context }
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# Tool with optional server_context
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assert ToolWithOptionalContext.method(:call).parameters.any? { |_type, name| name == :server_context }
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# Tool with required server_context
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assert ToolWithRequiredContext.method(:call).parameters.any? { |_type, name| name == :server_context }
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end
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test "tools can use splat kwargs to accept any arguments including server_context" do
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class FlexibleTool < Tool
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tool_name "flexible_tool"
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class << self
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def call(**kwargs)
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message = kwargs[:message]
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context = kwargs[:server_context]
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Tool::Response.new([
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{
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type: "text",
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content: "FlexibleTool: #{message} (context: #{context ? "present" : "absent"})",
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},
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])
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end
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end
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end
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server = Server.new(
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name: "test_server",
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tools: [FlexibleTool],
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server_context: { user: "test_user" },
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "flexible_tool",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "FlexibleTool: Hello (context: present)",
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response[:result][:content][0][:content]
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end
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# Prompt tests
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# Prompt without server_context parameter
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class SimplePromptWithoutContext < Prompt
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prompt_name "simple_prompt_without_context"
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description "A prompt that doesn't use server_context"
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arguments [Prompt::Argument.new(name: "message", required: true)]
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class << self
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def template(args)
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Prompt::Result.new(
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messages: [
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Prompt::Message.new(
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role: "user",
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content: Content::Text.new("SimplePromptWithoutContext: #{args[:message]}"),
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),
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],
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)
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end
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end
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end
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# Prompt with optional server_context parameter
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class PromptWithOptionalContext < Prompt
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prompt_name "prompt_with_optional_context"
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description "A prompt with optional server_context"
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arguments [Prompt::Argument.new(name: "message", required: true)]
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class << self
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def template(args, server_context: nil)
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user = server_context.respond_to?(:[]) ? server_context[:user] : nil
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context_info = user ? "with context: #{user}" : "no context"
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Prompt::Result.new(
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messages: [
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Prompt::Message.new(
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role: "user",
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content: Content::Text.new("PromptWithOptionalContext: #{args[:message]} (#{context_info})"),
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),
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],
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)
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end
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end
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end
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# Prompt with required server_context parameter
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class PromptWithRequiredContext < Prompt
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prompt_name "prompt_with_required_context"
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description "A prompt that requires server_context"
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arguments [Prompt::Argument.new(name: "message", required: true)]
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class << self
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def template(args, server_context:)
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Prompt::Result.new(
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messages: [
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Prompt::Message.new(
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role: "user",
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content: Content::Text.new(
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"PromptWithRequiredContext: #{args[:message]} for user #{server_context[:user]}",
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),
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),
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],
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)
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end
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end
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end
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test "prompt without server_context parameter works when server has context" do
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server = Server.new(
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name: "test_server",
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prompts: [SimplePromptWithoutContext],
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server_context: { user: "test_user" },
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "prompts/get",
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params: {
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name: "simple_prompt_without_context",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "SimplePromptWithoutContext: Hello", response[:result][:messages][0][:content][:text]
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end
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test "prompt with optional server_context receives context when server has it" do
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server = Server.new(
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name: "test_server",
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prompts: [PromptWithOptionalContext],
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server_context: { user: "test_user" },
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "prompts/get",
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params: {
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name: "prompt_with_optional_context",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "PromptWithOptionalContext: Hello (with context: test_user)",
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response[:result][:messages][0][:content][:text]
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end
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test "prompt with optional server_context works when server has no context" do
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server = Server.new(
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name: "test_server",
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prompts: [PromptWithOptionalContext],
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "prompts/get",
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params: {
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name: "prompt_with_optional_context",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "PromptWithOptionalContext: Hello (no context)",
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response[:result][:messages][0][:content][:text]
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end
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test "prompt with required server_context receives context" do
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server = Server.new(
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name: "test_server",
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prompts: [PromptWithRequiredContext],
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server_context: { user: "test_user" },
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "prompts/get",
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params: {
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name: "prompt_with_required_context",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "PromptWithRequiredContext: Hello for user test_user",
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response[:result][:messages][0][:content][:text]
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end
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test "prompts can use splat kwargs to accept any arguments including server_context" do
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class FlexiblePrompt < Prompt
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prompt_name "flexible_prompt"
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arguments [Prompt::Argument.new(name: "message", required: true)]
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class << self
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def template(args, **kwargs)
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message = args[:message]
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context = kwargs[:server_context]
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Prompt::Result.new(
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messages: [
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Prompt::Message.new(
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role: "user",
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content: Content::Text.new("FlexiblePrompt: #{message} (context: #{context ? "present" : "absent"})"),
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),
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],
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)
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end
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end
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end
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server = Server.new(
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name: "test_server",
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prompts: [FlexiblePrompt],
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server_context: { user: "test_user" },
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "prompts/get",
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params: {
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name: "flexible_prompt",
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arguments: { message: "Hello" },
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "FlexiblePrompt: Hello (context: present)",
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response[:result][:messages][0][:content][:text]
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end
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test "tool receives _meta when provided in request params" do
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class ToolWithMeta < Tool
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tool_name "tool_with_meta"
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description "A tool that uses _meta"
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input_schema({ properties: { message: { type: "string" } }, required: ["message"] })
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class << self
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def call(message:, server_context:)
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meta_info = server_context.dig(:_meta, :provider, :metadata)
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Tool::Response.new([
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{ type: "text", content: "Message: #{message}, Metadata: #{meta_info}" },
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])
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end
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end
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end
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server = Server.new(
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name: "test_server",
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tools: [ToolWithMeta],
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)
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request = {
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jsonrpc: "2.0",
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id: 1,
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method: "tools/call",
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params: {
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name: "tool_with_meta",
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arguments: { message: "Hello" },
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_meta: {
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provider: {
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metadata: "test_value",
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},
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},
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},
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}
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response = server.handle(request)
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assert response[:result]
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assert_equal "Message: Hello, Metadata: test_value",
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response[:result][:content][0][:content]
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end
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test "_meta is nested within server_context" do
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class ToolWithNestedMeta < Tool
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tool_name "tool_with_nested_meta"
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description "A tool that uses nested _meta"
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|
input_schema({ properties: { message: { type: "string" } }, required: ["message"] })
|
|
|
|
class << self
|
|
def call(message:, server_context:)
|
|
user = server_context[:user]
|
|
session_id = server_context.dig(:_meta, :session_id)
|
|
Tool::Response.new([
|
|
{ type: "text", content: "User: #{user}, Session: #{session_id}, Message: #{message}" },
|
|
])
|
|
end
|
|
end
|
|
end
|
|
|
|
server = Server.new(
|
|
name: "test_server",
|
|
tools: [ToolWithNestedMeta],
|
|
server_context: { user: "test_user", original_field: "value" },
|
|
)
|
|
|
|
request = {
|
|
jsonrpc: "2.0",
|
|
id: 1,
|
|
method: "tools/call",
|
|
params: {
|
|
name: "tool_with_nested_meta",
|
|
arguments: { message: "Hello" },
|
|
_meta: {
|
|
session_id: "abc123",
|
|
},
|
|
},
|
|
}
|
|
|
|
response = server.handle(request)
|
|
|
|
assert response[:result]
|
|
assert_equal "User: test_user, Session: abc123, Message: Hello",
|
|
response[:result][:content][0][:content]
|
|
end
|
|
|
|
test "_meta preserves original server_context" do
|
|
class ToolPreservesContext < Tool
|
|
tool_name "tool_preserves_context"
|
|
description "A tool that checks context preservation"
|
|
|
|
class << self
|
|
def call(server_context:)
|
|
priority = server_context[:priority]
|
|
meta_priority = server_context.dig(:_meta, :priority)
|
|
Tool::Response.new([
|
|
{ type: "text", content: "Context priority: #{priority}, Meta priority: #{meta_priority}" },
|
|
])
|
|
end
|
|
end
|
|
end
|
|
|
|
server = Server.new(
|
|
name: "test_server",
|
|
tools: [ToolPreservesContext],
|
|
server_context: { priority: "low" },
|
|
)
|
|
|
|
request = {
|
|
jsonrpc: "2.0",
|
|
id: 1,
|
|
method: "tools/call",
|
|
params: {
|
|
name: "tool_preserves_context",
|
|
arguments: {},
|
|
_meta: {
|
|
priority: "high",
|
|
},
|
|
},
|
|
}
|
|
|
|
response = server.handle(request)
|
|
|
|
assert response[:result]
|
|
assert_equal "Context priority: low, Meta priority: high", response[:result][:content][0][:content]
|
|
end
|
|
|
|
test "prompt receives _meta when provided in request params" do
|
|
class PromptWithMeta < Prompt
|
|
prompt_name "prompt_with_meta"
|
|
description "A prompt that uses _meta"
|
|
arguments [Prompt::Argument.new(name: "message", required: true)]
|
|
|
|
class << self
|
|
def template(args, server_context:)
|
|
meta_info = server_context.dig(:_meta, :request_id)
|
|
Prompt::Result.new(
|
|
messages: [
|
|
Prompt::Message.new(
|
|
role: "user",
|
|
content: Content::Text.new("Message: #{args[:message]}, Request ID: #{meta_info}"),
|
|
),
|
|
],
|
|
)
|
|
end
|
|
end
|
|
end
|
|
|
|
server = Server.new(
|
|
name: "test_server",
|
|
prompts: [PromptWithMeta],
|
|
)
|
|
|
|
request = {
|
|
jsonrpc: "2.0",
|
|
id: 1,
|
|
method: "prompts/get",
|
|
params: {
|
|
name: "prompt_with_meta",
|
|
arguments: { message: "Hello" },
|
|
_meta: {
|
|
request_id: "req_12345",
|
|
},
|
|
},
|
|
}
|
|
|
|
response = server.handle(request)
|
|
|
|
assert response[:result]
|
|
assert_equal "Message: Hello, Request ID: req_12345",
|
|
response[:result][:messages][0][:content][:text]
|
|
end
|
|
|
|
test "non-Hash server_context is preserved when _meta is present" do
|
|
server_obj = Object.new
|
|
def server_obj.custom_method
|
|
"custom_value"
|
|
end
|
|
|
|
tool_class = Class.new(Tool) do
|
|
tool_name "tool_with_non_hash_context"
|
|
|
|
define_singleton_method(:call) do |server_context:, **_args|
|
|
Tool::Response.new([
|
|
{ type: "text", content: "custom: #{server_context.custom_method}" },
|
|
])
|
|
end
|
|
end
|
|
|
|
server = Server.new(
|
|
name: "test_server",
|
|
tools: [tool_class],
|
|
server_context: server_obj,
|
|
)
|
|
|
|
request = {
|
|
jsonrpc: "2.0",
|
|
id: 1,
|
|
method: "tools/call",
|
|
params: {
|
|
name: "tool_with_non_hash_context",
|
|
arguments: {},
|
|
_meta: { progressToken: "token-1" },
|
|
},
|
|
}
|
|
|
|
response = server.handle(request)
|
|
|
|
assert response[:result]
|
|
assert_equal "custom: custom_value", response[:result][:content][0][:content]
|
|
end
|
|
|
|
test "_meta is nested within server_context for prompts" do
|
|
class PromptWithNestedContext < Prompt
|
|
prompt_name "prompt_with_nested_context"
|
|
description "A prompt that uses nested context"
|
|
arguments [Prompt::Argument.new(name: "message", required: true)]
|
|
|
|
class << self
|
|
def template(args, server_context:)
|
|
user = server_context[:user]
|
|
trace_id = server_context.dig(:_meta, :trace_id)
|
|
Prompt::Result.new(
|
|
messages: [
|
|
Prompt::Message.new(
|
|
role: "user",
|
|
content: Content::Text.new("User: #{user}, Trace: #{trace_id}, Message: #{args[:message]}"),
|
|
),
|
|
],
|
|
)
|
|
end
|
|
end
|
|
end
|
|
|
|
server = Server.new(
|
|
name: "test_server",
|
|
prompts: [PromptWithNestedContext],
|
|
server_context: { user: "prompt_user" },
|
|
)
|
|
|
|
request = {
|
|
jsonrpc: "2.0",
|
|
id: 1,
|
|
method: "prompts/get",
|
|
params: {
|
|
name: "prompt_with_nested_context",
|
|
arguments: { message: "World" },
|
|
_meta: {
|
|
trace_id: "trace_xyz789",
|
|
},
|
|
},
|
|
}
|
|
|
|
response = server.handle(request)
|
|
|
|
assert response[:result]
|
|
assert_equal "User: prompt_user, Trace: trace_xyz789, Message: World",
|
|
response[:result][:messages][0][:content][:text]
|
|
end
|
|
end
|
|
end
|