consensus/dccs: don't init the price engine when price.url not config…

…ured

consensus/dccs/2_dccs.go

@@ -511,7 +511,7 @@ func (c *Context) prepare2(header *types.Header) error {
  header.Difficulty = new(big.Int).SetUint64(difficulty)
 
  var price *Price
- if c.engine.config.IsPriceBlock(number) {
+ if c.engine.config.IsPriceBlock(number) && len(c.engine.priceURL) > 0 {
  price = c.engine.PriceEngine().CurrentPrice()
  if price == nil {
  log.Warn("No price to record in block", "number", number)

consensus/dccs/2_price.go

@@ -105,6 +105,10 @@ func (a ByPrice) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
 // CalcMedianPrice calculates the median price of a price block and cache it.
 // TODO: optimize rolling median calculation
 func (c *Context) CalcMedianPrice(number uint64) (*Price, error) {
+ if len(c.engine.priceURL) == 0 {
+ // price server URL not provided
+ return nil, nil
+ }
  if !c.engine.config.IsPriceBlock(number) {
  // not a price block
  return nil, nil
@@ -156,6 +160,10 @@ func medianPrice(prices []*Price, minValues int) (*Price, error) {
 
 // GetBlockPrice returns the price encoded in a block header extra data
 func (c *Context) GetBlockPrice(number uint64) *Price {
+ if len(c.engine.priceURL) == 0 {
+ // price server URL not provided
+ return nil
+ }
  if !c.engine.config.IsPriceBlock(number) {
  // not a price block
  return nil

eth/config.go

@@ -61,7 +61,6 @@ var DefaultConfig = Config{
  Blocks: 20,
  Percentile: 60,
  },
- PriceServiceURL: "http://localhost:3000/price/NUSD_USD",
 }
 
 func init() {