func()

in plugins/inputs/statsd/graphite/config.go [32:97]

• 50 lines of code
• 16 McCabe index (conditional complexity)

func (c *Config) validateTemplates() error {
	// map to keep track of filters we see
	filters := map[string]struct{}{}

	for i, t := range c.Templates {
		parts := strings.Fields(t)
		// Ensure template string is non-empty
		if len(parts) == 0 {
			return fmt.Errorf("missing template at position: %d", i)
		}
		if len(parts) == 1 && parts[0] == "" {
			return fmt.Errorf("missing template at position: %d", i)
		}

		if len(parts) > 3 {
			return fmt.Errorf("invalid template format: '%s'", t)
		}

		template := t
		filter := ""
		tags := ""
		if len(parts) >= 2 {
			// We could have <filter> <template>  or <template> <tags>.  Equals is only allowed in
			// tags section.
			if strings.Contains(parts[1], "=") {
				template = parts[0]
				tags = parts[1]
			} else {
				filter = parts[0]
				template = parts[1]
			}
		}

		if len(parts) == 3 {
			tags = parts[2]
		}

		// Validate the template has one and only one measurement
		if err := c.validateTemplate(template); err != nil {
			return err
		}

		// Prevent duplicate filters in the config
		if _, ok := filters[filter]; ok {
			return fmt.Errorf("duplicate filter '%s' found at position: %d", filter, i)
		}
		filters[filter] = struct{}{}

		if filter != "" {
			// Validate filter expression is valid
			if err := c.validateFilter(filter); err != nil {
				return err
			}
		}

		if tags != "" {
			// Validate tags
			for _, tagStr := range strings.Split(tags, ",") {
				if err := c.validateTag(tagStr); err != nil {
					return err
				}
			}
		}
	}
	return nil
}