aa8bbad491
## Summary Unlike applications, libraries provide value by remaining usable for a broad range of users, even when that means supporting older Ruby versions beyond Ruby's own EOL timeline. I maintain RuboCop, a Ruby linter. Because linters need to work across the ecosystem, they often need to keep compatibility with older Ruby versions to some extent. The trade-off is that the MCP Ruby SDK must remain compatible with Ruby 2.7. However, given the ecosystem impact, supporting Ruby 2.7 is still worthwhile. For example, bundled gems such as `csv` (Ruby >= 2.5), `bigdecimal` (Ruby >= 2.5), `json` (Ruby >= 2.7), and `language_server-protocol` (Ruby >= 2.5) tend to keep compatibility with older Ruby versions. Unlike dropping support, which imposes restrictions on users, this change broadens compatibility and does not introduce breaking changes. ## Development Note `rubocop-shopify` (2.18) supports Ruby 3.1+, and this PR does not change that. Since RuboCop can configure the runtime Ruby version and the target Ruby version for analysis independently, CI continues to run RuboCop on Ruby 4.0, while analyzing code with `TargetRubyVersion: 2.7`. When setting `TargetRubyVersion: 2.7`, several RuboCop offenses were resolved. Additionally, Sorbet-related libraries support Ruby 3.0+. Since these are not dependencies of the MCP Ruby SDK itself, they are versioned and tested in the development Gemfile.
88 lines
2.6 KiB
Ruby
88 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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module MCP
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class Client
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class HTTP
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attr_reader :url
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def initialize(url:, headers: {})
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@url = url
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@headers = headers
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end
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def send_request(request:)
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method = request[:method] || request["method"]
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params = request[:params] || request["params"]
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client.post("", request).body
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rescue Faraday::BadRequestError => e
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raise RequestHandlerError.new(
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"The #{method} request is invalid",
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{ method: method, params: params },
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error_type: :bad_request,
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original_error: e,
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)
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rescue Faraday::UnauthorizedError => e
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raise RequestHandlerError.new(
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"You are unauthorized to make #{method} requests",
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{ method: method, params: params },
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error_type: :unauthorized,
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original_error: e,
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)
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rescue Faraday::ForbiddenError => e
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raise RequestHandlerError.new(
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"You are forbidden to make #{method} requests",
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{ method: method, params: params },
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error_type: :forbidden,
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original_error: e,
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)
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rescue Faraday::ResourceNotFound => e
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raise RequestHandlerError.new(
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"The #{method} request is not found",
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{ method: method, params: params },
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error_type: :not_found,
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original_error: e,
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)
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rescue Faraday::UnprocessableEntityError => e
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raise RequestHandlerError.new(
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"The #{method} request is unprocessable",
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{ method: method, params: params },
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error_type: :unprocessable_entity,
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original_error: e,
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)
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rescue Faraday::Error => e # Catch-all
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raise RequestHandlerError.new(
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"Internal error handling #{method} request",
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{ method: method, params: params },
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error_type: :internal_error,
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original_error: e,
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)
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end
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private
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attr_reader :headers
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def client
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require_faraday!
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@client ||= Faraday.new(url) do |faraday|
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faraday.request(:json)
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faraday.response(:json)
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faraday.response(:raise_error)
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headers.each do |key, value|
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faraday.headers[key] = value
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end
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end
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end
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def require_faraday!
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require "faraday"
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rescue LoadError
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raise LoadError, "The 'faraday' gem is required to use the MCP client HTTP transport. " \
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"Add it to your Gemfile: gem 'faraday', '>= 2.0'" \
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"See https://rubygems.org/gems/faraday for more details."
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end
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end
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end
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end
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