func (c *walkContext) computeModuleVariable(
v *config.ModuleVariable) (string, error) {
// Build the path to our child
path := make([]string, len(c.Path), len(c.Path)+1)
copy(path, c.Path)
path = append(path, v.Name)
// Grab some locks
c.Context.sl.RLock()
defer c.Context.sl.RUnlock()
// Get that module from our state
mod := c.Context.state.ModuleByPath(path)
if mod == nil {
return "", fmt.Errorf(
"Module '%s' not found for variable '%s'",
strings.Join(path[1:], "."),
v.FullKey())
}
value, ok := mod.Outputs[v.Field]
if !ok {
return "", fmt.Errorf(
"Output field '%s' not found for variable '%s'",
v.Field,
v.FullKey())
}
return value, nil
}
func (i *Interpolater) valueModuleVar(
scope *InterpolationScope,
n string,
v *config.ModuleVariable,
result map[string]ast.Variable) error {
// Build the path to the child module we want
path := make([]string, len(scope.Path), len(scope.Path)+1)
copy(path, scope.Path)
path = append(path, v.Name)
// Grab the lock so that if other interpolations are running or
// state is being modified, we'll be safe.
i.StateLock.RLock()
defer i.StateLock.RUnlock()
// Get the module where we're looking for the value
mod := i.State.ModuleByPath(path)
if mod == nil {
// If the module doesn't exist, then we can return an empty string.
// This happens usually only in Refresh() when we haven't populated
// a state. During validation, we semantically verify that all
// modules reference other modules, and graph ordering should
// ensure that the module is in the state, so if we reach this
// point otherwise it really is a panic.
result[n] = unknownVariable()
// During apply this is always an error
if i.Operation == walkApply {
return fmt.Errorf(
"Couldn't find module %q for var: %s",
v.Name, v.FullKey())
}
} else {
// Get the value from the outputs
if outputState, ok := mod.Outputs[v.Field]; ok {
output, err := hil.InterfaceToVariable(outputState.Value)
if err != nil {
return err
}
result[n] = output
} else {
// Same reasons as the comment above.
result[n] = unknownVariable()
// During apply this is always an error
if i.Operation == walkApply {
return fmt.Errorf(
"Couldn't find output %q for module var: %s",
v.Field, v.FullKey())
}
}
}
return nil
}