The heat.engine.function Module

class heat.engine.function.Function(stack, fn_name, args)

Bases: object

Abstract base class for template functions.

dep_attrs(resource_name)

Return the attributes of the specified resource that are referenced.

Return an iterator over any attributes of the specified resource that this function references.

The special value heat.engine.attributes.ALL_ATTRIBUTES may be used to indicate that all attributes of the resource are required.

dependencies(path)

result()

Return the result of resolving the function.

Function subclasses must override this method to calculate their results.

stack

validate()

Validate arguments without resolving the function.

Function subclasses must override this method to validate their args.

class heat.engine.function.Invalid(stack, fn_name, args)

Bases: heat.engine.function.Function

A function for checking condition functions and to force failures.

This function is used to force failures for functions that are not supported in condition definition.

result()

class heat.engine.function.Macro(stack, fn_name, raw_args, parse_func, template)

Bases: heat.engine.function.Function

Abstract base class for template macros.

A macro differs from a function in that it controls how the template is parsed. As such, it operates on the syntax tree itself, not on the parsed output.

dep_attrs(resource_name)

Return the attributes of the specified resource that are referenced.

Return an iterator over any attributes of the specified resource that this function references.

The special value heat.engine.attributes.ALL_ATTRIBUTES may be used to indicate that all attributes of the resource are required.

dependencies(path)

parse_args(parse_func)

Parse the macro using the supplied parsing function.

Macro subclasses should override this method to control parsing of the arguments.

result()

Return the resolved result of the macro contents.

template

validate()

Validate arguments without resolving the result.

heat.engine.function.dep_attrs(snippet, resource_name)

Iterator over dependent attrs of a resource in a template snippet.

The snippet should be already parsed to insert Function objects where appropriate.

Returns:an iterator over the attributes of the specified resource that

are referenced in the template snippet.

heat.engine.function.dependencies(snippet, path=”)

Return an iterator over Resource dependencies in a template snippet.

The snippet should be already parsed to insert Function objects where appropriate.

heat.engine.function.resolve(snippet)

heat.engine.function.validate(snippet, path=”)