Golang Object.Len方法代碼示例

func parseProject(result *File, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'project' block allowed")
	}

	// Check for invalid keys
	valid := []string{"name", "infrastructure"}
	if err := checkHCLKeys(obj, valid); err != nil {
		return multierror.Prefix(err, "project:")
	}

	var m map[string]interface{}
	if err := hcl.DecodeObject(&m, obj); err != nil {
		return err
	}

	// Parse the project
	var proj Project
	result.Project = &proj
	if err := mapstructure.WeakDecode(m, &proj); err != nil {
		return err
	}

	return nil
}

func parseUpdate(result *structs.UpdateStrategy, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'update' block allowed per job")
	}

	for _, o := range obj.Elem(false) {
		var m map[string]interface{}
		if err := hcl.DecodeObject(&m, o); err != nil {
			return err
		}
		for _, key := range []string{"stagger", "Stagger"} {
			if raw, ok := m[key]; ok {
				switch v := raw.(type) {
				case string:
					dur, err := time.ParseDuration(v)
					if err != nil {
						return fmt.Errorf("invalid stagger time '%s'", raw)
					}
					m[key] = dur
				case int:
					m[key] = time.Duration(v) * time.Second
				default:
					return fmt.Errorf("invalid type for stagger time '%s'",
						raw)
				}
			}
		}

		if err := mapstructure.WeakDecode(m, result); err != nil {
			return err
		}
	}
	return nil
}

func parseUpdate(result *structs.UpdateStrategy, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'update' block allowed per job")
	}

	for _, o := range obj.Elem(false) {
		var m map[string]interface{}
		if err := hcl.DecodeObject(&m, o); err != nil {
			return err
		}
		for _, key := range []string{"stagger", "Stagger"} {
			if raw, ok := m[key]; ok {
				staggerTime, err := toDuration(raw)
				if err != nil {
					return fmt.Errorf("Invalid stagger time: %v", err)
				}
				m[key] = staggerTime
			}
		}

		if err := mapstructure.WeakDecode(m, result); err != nil {
			return err
		}
	}
	return nil
}

func parseResources(result *structs.Resources, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'resource' block allowed per task")
	}

	for _, o := range obj.Elem(false) {
		var m map[string]interface{}
		if err := hcl.DecodeObject(&m, o); err != nil {
			return err
		}
		delete(m, "network")

		if err := mapstructure.WeakDecode(m, result); err != nil {
			return err
		}

		// Parse the network resources
		if o := o.Get("network", false); o != nil {
			if o.Len() > 1 {
				return fmt.Errorf("only one 'network' resource allowed")
			}

			var r structs.NetworkResource
			var m map[string]interface{}
			if err := hcl.DecodeObject(&m, o); err != nil {
				return err
			}
			if err := mapstructure.WeakDecode(m, &r); err != nil {
				return err
			}

			// Keep track of labels we've already seen so we can ensure there
			// are no collisions when we turn them into environment variables.
			// lowercase:NomalCase so we can get the first for the error message
			seenLabel := map[string]string{}

			for _, label := range r.DynamicPorts {
				if !reDynamicPorts.MatchString(label) {
					return errDynamicPorts
				}
				first, seen := seenLabel[strings.ToLower(label)]
				if seen {
					return fmt.Errorf("Found a port label collision: `%s` overlaps with previous `%s`", label, first)
				} else {
					seenLabel[strings.ToLower(label)] = label
				}

			}

			result.Networks = []*structs.NetworkResource{&r}
		}

	}

	return nil
}

func parseJob(jobNode *hclObj.Object, errors *multierror.Error) JobConfig {
	config := JobConfig{}

	if jobNode.Len() > 1 {
		errors = multierror.Append(errors, fmt.Errorf("job was specified more than once"))
	} else {
		if jobNode.Type != hclObj.ValueTypeObject {
			errors = multierror.Append(errors, fmt.Errorf("job was specified as an invalid type - expected object, found %s", jobNode.Type))
		} else {
			config.Name = jobNode.Key
			config.Trigger = parseJobTrigger(jobNode, errors)
			config.Exec = parseExec(jobNode, errors)
		}
	}
	return config
}

func parseApplication(result *File, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'application' block allowed")
	}

	// Check for invalid keys
	valid := []string{"name", "type", "dependency"}
	if err := checkHCLKeys(obj, valid); err != nil {
		return multierror.Prefix(err, "application:")
	}

	var m map[string]interface{}
	if err := hcl.DecodeObject(&m, obj); err != nil {
		return err
	}

	var app Application
	result.Application = &app
	return mapstructure.WeakDecode(m, &app)
}

func loadProvisionersHcl(os *hclobj.Object, connInfo map[string]interface{}) ([]*Provisioner, error) {
	pos := make([]*hclobj.Object, 0, int(os.Len()))

	// Accumulate all the actual provisioner configuration objects. We
	// have to iterate twice here:
	//
	//  1. The first iteration is of the list of `provisioner` blocks.
	//  2. The second iteration is of the dictionary within the
	//      provisioner which will have only one element which is the
	//      type of provisioner to use along with tis config.
	//
	// In JSON it looks kind of like this:
	//
	//   [
	//     {
	//       "shell": {
	//         ...
	//       }
	//     }
	//   ]
	//
	for _, o1 := range os.Elem(false) {
		for _, o2 := range o1.Elem(true) {
			pos = append(pos, o2)
		}
	}

	// Short-circuit if there are no items
	if len(pos) == 0 {
		return nil, nil
	}

	result := make([]*Provisioner, 0, len(pos))
	for _, po := range pos {
		var config map[string]interface{}
		if err := hcl.DecodeObject(&config, po); err != nil {
			return nil, err
		}

		// Delete the "connection" section, handle seperately
		delete(config, "connection")

		rawConfig, err := NewRawConfig(config)
		if err != nil {
			return nil, err
		}

		// Check if we have a provisioner-level connection
		// block that overrides the resource-level
		var subConnInfo map[string]interface{}
		if o := po.Get("connection", false); o != nil {
			err := hcl.DecodeObject(&subConnInfo, o)
			if err != nil {
				return nil, err
			}
		}

		// Inherit from the resource connInfo any keys
		// that are not explicitly overriden.
		if connInfo != nil && subConnInfo != nil {
			for k, v := range connInfo {
				if _, ok := subConnInfo[k]; !ok {
					subConnInfo[k] = v
				}
			}
		} else if subConnInfo == nil {
			subConnInfo = connInfo
		}

		// Parse the connInfo
		connRaw, err := NewRawConfig(subConnInfo)
		if err != nil {
			return nil, err
		}

		result = append(result, &Provisioner{
			Type:      po.Key,
			RawConfig: rawConfig,
			ConnInfo:  connRaw,
		})
	}

	return result, nil
}

func parseJob(result *structs.Job, obj *hclobj.Object) error {
	if obj.Len() > 1 {
		return fmt.Errorf("only one 'job' block allowed")
	}

	// Get our job object
	obj = obj.Elem(true)[0]

	// Decode the full thing into a map[string]interface for ease
	var m map[string]interface{}
	if err := hcl.DecodeObject(&m, obj); err != nil {
		return err
	}
	delete(m, "constraint")
	delete(m, "meta")
	delete(m, "update")

	// Set the ID and name to the object key
	result.ID = obj.Key
	result.Name = obj.Key

	// Defaults
	result.Priority = 50
	result.Region = "global"
	result.Type = "service"

	// Decode the rest
	if err := mapstructure.WeakDecode(m, result); err != nil {
		return err
	}

	// Parse constraints
	if o := obj.Get("constraint", false); o != nil {
		if err := parseConstraints(&result.Constraints, o); err != nil {
			return err
		}
	}

	// If we have an update strategy, then parse that
	if o := obj.Get("update", false); o != nil {
		if err := parseUpdate(&result.Update, o); err != nil {
			return err
		}
	}

	// Parse out meta fields. These are in HCL as a list so we need
	// to iterate over them and merge them.
	if metaO := obj.Get("meta", false); metaO != nil {
		for _, o := range metaO.Elem(false) {
			var m map[string]interface{}
			if err := hcl.DecodeObject(&m, o); err != nil {
				return err
			}
			if err := mapstructure.WeakDecode(m, &result.Meta); err != nil {
				return err
			}
		}
	}

	// If we have tasks outside, do those
	if o := obj.Get("task", false); o != nil {
		var tasks []*structs.Task
		if err := parseTasks(&tasks, o); err != nil {
			return err
		}

		result.TaskGroups = make([]*structs.TaskGroup, len(tasks), len(tasks)*2)
		for i, t := range tasks {
			result.TaskGroups[i] = &structs.TaskGroup{
				Name:  t.Name,
				Count: 1,
				Tasks: []*structs.Task{t},
			}
		}
	}

	// Parse the task groups
	if o := obj.Get("group", false); o != nil {
		if err := parseGroups(result, o); err != nil {
			return fmt.Errorf("error parsing 'group': %s", err)
		}
	}

	return nil
}

func (d *decoder) decodeInterface(name string, o *hcl.Object, result reflect.Value) error {
	var set reflect.Value
	redecode := true

	switch o.Type {
	case hcl.ValueTypeObject:
		// If we're at the root or we're directly within a slice, then we
		// decode objects into map[string]interface{}, otherwise we decode
		// them into lists.
		if len(d.stack) == 0 || d.stack[len(d.stack)-1] == reflect.Slice {
			var temp map[string]interface{}
			tempVal := reflect.ValueOf(temp)
			result := reflect.MakeMap(
				reflect.MapOf(
					reflect.TypeOf(""),
					tempVal.Type().Elem()))

			set = result
		} else {
			var temp []map[string]interface{}
			tempVal := reflect.ValueOf(temp)
			result := reflect.MakeSlice(
				reflect.SliceOf(tempVal.Type().Elem()), 0, int(o.Len()))
			set = result
		}
	case hcl.ValueTypeList:
		var temp []interface{}
		tempVal := reflect.ValueOf(temp)
		result := reflect.MakeSlice(
			reflect.SliceOf(tempVal.Type().Elem()), 0, 0)
		set = result
	case hcl.ValueTypeBool:
		var result bool
		set = reflect.Indirect(reflect.New(reflect.TypeOf(result)))
	case hcl.ValueTypeFloat:
		var result float64
		set = reflect.Indirect(reflect.New(reflect.TypeOf(result)))
	case hcl.ValueTypeInt:
		var result int
		set = reflect.Indirect(reflect.New(reflect.TypeOf(result)))
	case hcl.ValueTypeString:
		set = reflect.Indirect(reflect.New(reflect.TypeOf("")))
	default:
		return fmt.Errorf(
			"%s: cannot decode into interface: %T",
			name, o)
	}

	// Set the result to what its supposed to be, then reset
	// result so we don't reflect into this method anymore.
	result.Set(set)

	if redecode {
		// Revisit the node so that we can use the newly instantiated
		// thing and populate it.
		if err := d.decode(name, o, result); err != nil {
			return err
		}
	}

	return nil
}