Propagate DcUpdateEach setting

internal/cli/run_proxy.go

 		AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
 		TolerateTimeSkewness:     conf.TolerateTimeSkewness.Value,
 		DCOverrides:              dcOverrides,
+		DCUpdateEach:             conf.DCUpdateEach.Get(0),
 	}
 
 	proxy, err := mtglib.NewProxy(opts)

internal/cli/simple_run.go

 	conf.Debug.Value = s.Debug
 	conf.AllowFallbackOnUnknownDC.Value = true
 	conf.Defense.AntiReplay.Enabled.Value = true
+	conf.DCUpdateEach.Value = 0
 
 	if err := conf.Validate(); err != nil {
 		return fmt.Errorf("invalid result configuration: %w", err)

internal/config/config.go

 		} `json:"prometheus"`
 	} `json:"stats"`
 	DCOverrides []struct {
-		DC  TypeDC
+		DC  TypeDC         `json:"dc"`
 		IPs []TypeHostPort `json:"ips"`
-	} `json:"dc_overrides"`
+	} `json:"dcOverrides"`
+	DCUpdateEach TypeDuration `json:"dcUpdateEach"`
 }
 
 func (c *Config) Validate() error {

internal/config/parse.go

 	DCOverrides []struct {
 		DC  int      `toml:"dc" json:"dc"`
 		IPs []string `toml:"ips" json:"ips"`
-	}
+	} `toml:"dc-overrides" json:"dcOverrides,omitempty"`
+	DCUpdateEach string `toml:"dc-update-each" json:"dcUpdateEach,omitempty"`
 }
 
 func Parse(rawData []byte) (*Config, error) {

mtglib/init.go

 	// reads from Telegram after which connection will be terminated. This is
 	// required to abort stale connections.
 	TCPRelayReadTimeout = 20 * time.Second
+
+	// DefaultDCUpdateEach defines a time period that is used to fetch
+	// a relevant list of DCs to use from Telegram using its own MTPROTO API.
+	DefaultDCUpdateEach = time.Hour
 )
 
 // Network defines a knowledge how to work with a network. It may sound fun but

mtglib/internal/dc/init.go

 package dc
 
-import "time"
-
 type preferIP uint8
 
 const (
 )
 
 const (
-	DefaultDC                    = 2
-	DefaultUpdateDCAddressesEach = time.Hour
+	DefaultDC = 2
 
 	defaultAppID   = 123456
 	defaultAppHash = ""

mtglib/internal/dc/telegram.go

 }
 
 func (t *Telegram) Run(ctx context.Context, updateEach time.Duration) {
-	if updateEach == 0 {
-		updateEach = DefaultUpdateDCAddressesEach
-	}
-
 	t.update(ctx)
 
 	ticker := time.NewTicker(updateEach)

mtglib/proxy.go

 		telegram:                 tg,
 	}
 
-	go tg.Run(ctx, 0) // TODO: propagate value
+	dcUpdateEach := opts.DCUpdateEach
+	if dcUpdateEach == 0 {
+		dcUpdateEach = DefaultDCUpdateEach
+	}
+
+	go tg.Run(ctx, dcUpdateEach)
 
 	pool, err := ants.NewPoolWithFunc(opts.getConcurrency(),
 		func(arg interface{}) {

mtglib/proxy_opts.go

 	//
 	// This is an optional setting
 	DCOverrides map[int][]string
+
+	// DCUpdateEach defines a time duration that is used to fetch a list of
+	// DCs to use from the Telegram.
+	DCUpdateEach time.Duration
 }
 
 func (p ProxyOpts) valid() error {