config.go

package main

import (
	"encoding/json"
	"errors"
)

type RegexpConfig struct {
	Name string `json:"name"`
	Re   string `json:"re"`
}

type Config struct {
	Regexps          []RegexpConfig `json:"regexps"`
	Interval         int            `json:"interval"`
	Interface        string         `json:"interface"`
	Port             int            `json:"port"`
	NumItemsToReport int            `json:"num_items_to_report"`
	Quiet            bool           `json:"quiet"`
	OutputFile       string         `json:"output_file"`
	ShowErrors       bool           `json:"show_errors"`

	/* When using regexps, include a list of keys that did not match in the
	 * output.  Useful for debugging regular expressions.
	 */
	ShowUnmatched bool `json:"show_unmatched"`
}

func NewConfig(config_data []byte) (config Config, err error) {
	config = Config{
		Regexps:          []RegexpConfig{},
		Interval:         5,
		Interface:        "any",
		Port:             11211,
		NumItemsToReport: 20,
		Quiet:            false,
		ShowErrors:       true,
		ShowUnmatched:    false,
	}
	err = json.Unmarshal(config_data, &config)
	if err != nil {
		return config, err
	}

	// Validate config
	for _, regexp_config := range config.Regexps {
		if regexp_config.Name == "" || regexp_config.Re == "" {
			return config, errors.New(
				"Config error: regular expressions must have both a 're' and 'name' field.")
		}
	}

	return config, nil
}