124 lines
2.7 KiB
Go
124 lines
2.7 KiB
Go
package disk
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import (
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"encoding/json"
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"errors"
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"time"
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"github.com/ipfs-cluster/ipfs-cluster/config"
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"github.com/kelseyhightower/envconfig"
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)
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const configKey = "disk"
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const envConfigKey = "cluster_disk"
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// Default values for disk Config
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const (
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DefaultMetricTTL = 30 * time.Second
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DefaultMetricType = MetricFreeSpace
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)
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// Config is used to initialize an Informer and customize
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// the type and parameters of the metric it produces.
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type Config struct {
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config.Saver
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MetricTTL time.Duration
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MetricType MetricType
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}
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type jsonConfig struct {
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MetricTTL string `json:"metric_ttl"`
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MetricType string `json:"metric_type"`
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}
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// ConfigKey returns a human-friendly identifier for this type of Metric.
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func (cfg *Config) ConfigKey() string {
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return configKey
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}
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// Default initializes this Config with sensible values.
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func (cfg *Config) Default() error {
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cfg.MetricTTL = DefaultMetricTTL
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cfg.MetricType = DefaultMetricType
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return nil
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}
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// ApplyEnvVars fills in any Config fields found
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// as environment variables.
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func (cfg *Config) ApplyEnvVars() error {
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jcfg := cfg.toJSONConfig()
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err := envconfig.Process(envConfigKey, jcfg)
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if err != nil {
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return err
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}
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return cfg.applyJSONConfig(jcfg)
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}
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// Validate checks that the fields of this Config have working values,
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// at least in appearance.
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func (cfg *Config) Validate() error {
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if cfg.MetricTTL <= 0 {
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return errors.New("disk.metric_ttl is invalid")
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}
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if cfg.MetricType.String() == "" {
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return errors.New("disk.metric_type is invalid")
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}
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return nil
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}
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// LoadJSON reads the fields of this Config from a JSON byteslice as
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// generated by ToJSON.
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func (cfg *Config) LoadJSON(raw []byte) error {
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jcfg := &jsonConfig{}
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err := json.Unmarshal(raw, jcfg)
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if err != nil {
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logger.Error("Error unmarshaling disk informer config")
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return err
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}
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cfg.Default()
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return cfg.applyJSONConfig(jcfg)
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}
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func (cfg *Config) applyJSONConfig(jcfg *jsonConfig) error {
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t, _ := time.ParseDuration(jcfg.MetricTTL)
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cfg.MetricTTL = t
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switch jcfg.MetricType {
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case "reposize":
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cfg.MetricType = MetricRepoSize
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case "freespace":
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cfg.MetricType = MetricFreeSpace
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default:
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return errors.New("disk.metric_type is invalid")
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}
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return cfg.Validate()
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}
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// ToJSON generates a JSON-formatted human-friendly representation of this
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// Config.
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func (cfg *Config) ToJSON() (raw []byte, err error) {
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jcfg := cfg.toJSONConfig()
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raw, err = config.DefaultJSONMarshal(jcfg)
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return
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}
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func (cfg *Config) toJSONConfig() *jsonConfig {
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return &jsonConfig{
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MetricTTL: cfg.MetricTTL.String(),
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MetricType: cfg.MetricType.String(),
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}
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}
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// ToDisplayJSON returns JSON config as a string.
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func (cfg *Config) ToDisplayJSON() ([]byte, error) {
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return config.DisplayJSON(cfg.toJSONConfig())
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}
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