213 lines
7.2 KiB
Ruby
213 lines
7.2 KiB
Ruby
require 'constants'
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class ShellExecutionException < RuntimeError
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attr_reader :shell_result
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def initialize(shell_result)
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@shell_result = shell_result
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end
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end
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class ToolExecutor
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constructor :configurator, :tool_executor_helper, :streaminator, :system_wrapper
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def setup
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@tool_name = ''
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@executable = ''
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end
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# build up a command line from yaml provided config
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def build_command_line(tool_config, *args)
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@tool_name = tool_config[:name]
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@executable = tool_config[:executable]
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command = {}
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# basic premise is to iterate top to bottom through arguments using '$' as
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# a string replacement indicator to expand globals or inline yaml arrays
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# into command line arguments via substitution strings
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command[:line] = [
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@tool_executor_helper.osify_path_separators( expandify_element(@executable, *args) ),
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build_arguments(tool_config[:arguments], *args),
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].join(' ').strip
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command[:options] = {
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:stderr_redirect => @tool_executor_helper.stderr_redirection(tool_config, @configurator.project_logging),
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:background_exec => tool_config[:background_exec]
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}
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return command
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end
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# shell out, execute command, and return response
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def exec(command, options={}, args=[])
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options[:boom] = true if (options[:boom].nil?)
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options[:stderr_redirect] = StdErrRedirect::NONE if (options[:stderr_redirect].nil?)
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options[:background_exec] = BackgroundExec::NONE if (options[:background_exec].nil?)
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# build command line
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command_line = [
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@tool_executor_helper.background_exec_cmdline_prepend( options ),
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command.strip,
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args,
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@tool_executor_helper.stderr_redirect_cmdline_append( options ),
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@tool_executor_helper.background_exec_cmdline_append( options ),
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].flatten.compact.join(' ')
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shell_result = {}
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# depending on background exec option, we shell out differently
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if (options[:background_exec] != BackgroundExec::NONE)
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shell_result = @system_wrapper.shell_system( command_line )
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else
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shell_result = @system_wrapper.shell_backticks( command_line )
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end
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@tool_executor_helper.print_happy_results( command_line, shell_result, options[:boom] )
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@tool_executor_helper.print_error_results( command_line, shell_result, options[:boom] )
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# go boom if exit code isn't 0 (but in some cases we don't want a non-0 exit code to raise)
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raise ShellExecutionException.new(shell_result) if ((shell_result[:exit_code] != 0) and options[:boom])
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return shell_result
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end
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private #############################
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def build_arguments(config, *args)
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build_string = ''
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return nil if (config.nil?)
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# iterate through each argument
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# the yaml blob array needs to be flattened so that yaml substitution
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# is handled correctly, since it creates a nested array when an anchor is
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# dereferenced
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config.flatten.each do |element|
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argument = ''
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case(element)
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# if we find a simple string then look for string replacement operators
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# and expand with the parameters in this method's argument list
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when String then argument = expandify_element(element, *args)
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# if we find a hash, then we grab the key as a substitution string and expand the
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# hash's value(s) within that substitution string
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when Hash then argument = dehashify_argument_elements(element)
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end
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build_string.concat("#{argument} ") if (argument.length > 0)
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end
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build_string.strip!
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return build_string if (build_string.length > 0)
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return nil
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end
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# handle simple text string argument & argument array string replacement operators
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def expandify_element(element, *args)
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match = //
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to_process = nil
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args_index = 0
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# handle ${#} input replacement
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if (element =~ TOOL_EXECUTOR_ARGUMENT_REPLACEMENT_PATTERN)
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args_index = ($2.to_i - 1)
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if (args.nil? or args[args_index].nil?)
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@streaminator.stderr_puts("ERROR: Tool '#{@tool_name}' expected valid argument data to accompany replacement operator #{$1}.", Verbosity::ERRORS)
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raise
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end
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match = /#{Regexp.escape($1)}/
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to_process = args[args_index]
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end
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# simple string argument: replace escaped '\$' and strip
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element.sub!(/\\\$/, '$')
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element.strip!
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# handle inline ruby execution
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if (element =~ RUBY_EVAL_REPLACEMENT_PATTERN)
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element.replace(eval($1))
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end
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build_string = ''
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# handle array or anything else passed into method to be expanded in place of replacement operators
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case (to_process)
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when Array then to_process.each {|value| build_string.concat( "#{element.sub(match, value.to_s)} " ) } if (to_process.size > 0)
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else build_string.concat( element.sub(match, to_process.to_s) )
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end
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# handle inline ruby string substitution
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if (build_string =~ RUBY_STRING_REPLACEMENT_PATTERN)
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build_string.replace(@system_wrapper.module_eval(build_string))
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end
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return build_string.strip
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end
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# handle argument hash: keys are substitution strings, values are data to be expanded within substitution strings
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def dehashify_argument_elements(hash)
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build_string = ''
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elements = []
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# grab the substitution string (hash key)
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substitution = hash.keys[0].to_s
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# grab the string(s) to squirt into the substitution string (hash value)
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expand = hash[hash.keys[0]]
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if (expand.nil?)
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@streaminator.stderr_puts("ERROR: Tool '#{@tool_name}' could not expand nil elements for substitution string '#{substitution}'.", Verbosity::ERRORS)
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raise
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end
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# array-ify expansion input if only a single string
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expansion = ((expand.class == String) ? [expand] : expand)
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expansion.each do |item|
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# code eval substitution
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if (item =~ RUBY_EVAL_REPLACEMENT_PATTERN)
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elements << eval($1)
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# string eval substitution
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elsif (item =~ RUBY_STRING_REPLACEMENT_PATTERN)
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elements << @system_wrapper.module_eval(item)
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# global constants
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elsif (@system_wrapper.constants_include?(item))
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const = Object.const_get(item)
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if (const.nil?)
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@streaminator.stderr_puts("ERROR: Tool '#{@tool_name}' found constant '#{item}' to be nil.", Verbosity::ERRORS)
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raise
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else
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elements << const
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end
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elsif (item.class == Array)
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elements << item
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elsif (item.class == String)
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@streaminator.stderr_puts("ERROR: Tool '#{@tool_name}' cannot expand nonexistent value '#{item}' for substitution string '#{substitution}'.", Verbosity::ERRORS)
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raise
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else
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@streaminator.stderr_puts("ERROR: Tool '#{@tool_name}' cannot expand value having type '#{item.class}' for substitution string '#{substitution}'.", Verbosity::ERRORS)
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raise
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end
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end
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# expand elements (whether string or array) into substitution string & replace escaped '\$'
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elements.flatten!
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elements.each do |element|
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build_string.concat( substitution.sub(/([^\\]*)\$/, "\\1#{element}") ) # don't replace escaped '\$' but allow us to replace just a lonesome '$'
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build_string.gsub!(/\\\$/, '$')
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build_string.concat(' ')
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end
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return build_string.strip
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end
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end
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