feat(chDB-bindings): Add Ruby bindings and spec tests for chDB C++ library

Implement initial Ruby bindings for chDB's core functions and include comprehensive spec tests to ensure compatibility and correctness.

Author: wudidapaopao

LICENSE.txt

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lib/chdb.rb

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+# frozen_string_literal: true
+
+begin
+  RUBY_VERSION =~ /(\d+\.\d+)/
+  require "ChDB/#{Regexp.last_match(1)}/chdb"
+rescue LoadError
+  require "ChDB/chdb"
+end
+
+require "chdb/database"
+require "chdb/version"
+require "chdb/version_info"

lib/chdb/constants.rb

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+# frozen_string_literal: true
+
+module ChDB
+  module Constants # rubocop:disable Style/Documentation
+  end
+end

lib/chdb/data_path.rb

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+# frozen_string_literal: true
+
+require "cgi"
+require "fileutils"
+require "tempfile"
+require "chdb/constants"
+require "chdb/errors"
+
+module ChDB
+  # Represents the data path configuration for ChDB.
+  # This class is responsible for initializing and managing the data path
+  # including parsing URIs, handling query parameters, and ensuring directory existence.
+  class DataPath
+    attr_reader :dir_path, :is_tmp, :query_params, :mode
+
+    def initialize(uri, options)
+      initialize_instance_variables
+      path = parse_uri(uri)
+      merge_options(options)
+      check_params
+      directory_path(path)
+    end
+
+    def generate_arguments # rubocop:disable Metrics/MethodLength
+      args = ["clickhouse", "--path=#{@dir_path}"]
+      excluded_keys = %i[results_as_hash readonly readwrite flags]
+
+      @query_params.each do |key, value|
+        next if excluded_keys.include?(key)
+
+        case key.to_s
+        when "udf_path"
+          udf_value = value.to_s
+          args += ["--", "--user_scripts_path=#{udf_value}",
+                   "--user_defined_executable_functions_config=#{udf_value}/*.xml"]
+          next
+        when "--"
+          args << "--"
+          next
+        end
+
+        key_str = key.to_s
+        args << if value.nil?
+                  "--#{key_str}"
+                else
+                  "--#{key_str}=#{value}"
+                end
+      end
+
+      args << "--readonly=1" if (@mode & Constants::Open::READONLY) != 0
+
+      args
+    end
+
+    def close
+      FileUtils.remove_entry(@dir_path, true) if @is_tmp && Dir.exist?(@dir_path)
+    end
+
+    private
+
+    def initialize_instance_variables
+      @dir_path = nil
+      @is_tmp = false
+      @query_params = {}
+      @mode = 0
+    end
+
+    def parse_uri(uri)
+      path, query_str = uri.split("?", 2) unless uri.nil?
+      @query_params = CGI.parse(query_str.to_s).transform_values(&:last) unless query_str.nil?
+      remove_file_prefix(path)
+    end
+
+    def merge_options(options)
+      @query_params = @query_params.merge(options)
+      # @query_params = @query_params.merge(options.transform_keys(&:to_s))
+    end
+
+    def directory_path(path)
+      if path.nil? || path.empty? || path == ":memory:"
+        @is_tmp = true
+        @dir_path = Dir.mktmpdir("chdb_")
+      else
+        @dir_path = File.expand_path(path)
+        ensure_directory_exists
+      end
+    end
+
+    def ensure_directory_exists
+      if (@mode & Constants::Open::CREATE).zero?
+        raise DirectoryNotFoundException, "Directory #{@dir_path} required" unless Dir.exist?(@dir_path)
+
+        return
+      end
+
+      FileUtils.mkdir_p(@dir_path, mode: 0o755) unless Dir.exist?(@dir_path)
+    end
+
+    def check_params # rubocop:disable Metrics/MethodLength
+      @mode = Constants::Open::READWRITE | Constants::Open::CREATE
+      @mode = Constants::Open::READONLY if @query_params[:readonly]
+
+      if @query_params[:readwrite]
+        raise InvalidArgumentException, "conflicting options: readonly and readwrite" if @query_params[:readonly]
+
+        @mode = Constants::Open::READWRITE
+      end
+
+      return unless @query_params[:flags]
+      if @query_params[:readonly] || @query_params[:readwrite]
+        raise InvalidArgumentException, "conflicting options: flags with readonly and/or readwrite"
+      end
+
+      @mode = @query_params[:flags]
+    end
+
+    def remove_file_prefix(str)
+      str.sub(/\Afile:/, "")
+    end
+  end
+end