// parseCloudConfig parses the provided config into a node structure and logs
// any parsing issues into the provided report. Unrecoverable errors are
// returned as an error.
func parseCloudConfig(cfg []byte, report *Report) (node, error) {
yaml.UnmarshalMappingKeyTransform = func(nameIn string) (nameOut string) {
return nameIn
}
// unmarshal the config into an implicitly-typed form. The yaml library
// will implicitly convert types into their normalized form
// (e.g. 0744 -> 484, off -> false).
var weak map[interface{}]interface{}
if err := yaml.Unmarshal(cfg, &weak); err != nil {
matches := yamlLineError.FindStringSubmatch(err.Error())
if len(matches) == 3 {
line, err := strconv.Atoi(matches[1])
if err != nil {
return node{}, err
}
msg := matches[2]
report.Error(line, msg)
return node{}, nil
}
matches = yamlError.FindStringSubmatch(err.Error())
if len(matches) == 2 {
report.Error(1, matches[1])
return node{}, nil
}
return node{}, errors.New("couldn't parse yaml error")
}
w := NewNode(weak, NewContext(cfg))
w = normalizeNodeNames(w, report)
// unmarshal the config into the explicitly-typed form.
yaml.UnmarshalMappingKeyTransform = func(nameIn string) (nameOut string) {
return strings.Replace(nameIn, "-", "_", -1)
}
var strong config.CloudConfig
if err := yaml.Unmarshal([]byte(cfg), &strong); err != nil {
return node{}, err
}
s := NewNode(strong, NewContext(cfg))
// coerceNodes weak nodes and strong nodes. strong nodes replace weak nodes
// if they are compatible types (this happens when the yaml library
// converts the input).
// (e.g. weak 484 is replaced by strong 0744, weak 4 is not replaced by
// strong false)
return coerceNodes(w, s), nil
}
// NewCloudConfig instantiates a new CloudConfig from the given contents (a
// string of YAML), returning any error encountered. It will ignore unknown
// fields but log encountering them.
func NewCloudConfig(contents string) (*CloudConfig, error) {
yaml.UnmarshalMappingKeyTransform = func(nameIn string) (nameOut string) {
return strings.Replace(nameIn, "-", "_", -1)
}
var cfg CloudConfig
err := yaml.Unmarshal([]byte(contents), &cfg)
return &cfg, err
}