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les: implement ultralight client (#16904)

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For more information about this light client mode, read
https://hackmd.io/s/HJy7jjZpm
This commit is contained in:
b00ris
2019-01-24 14:18:26 +03:00
committed by Felix Lange
parent b8f9b3779f
commit 769657060e
23 changed files with 1288 additions and 179 deletions
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16
core/headerchain.go
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@ -219,14 +219,18 @@ func (hc *HeaderChain) ValidateHeaderChain(chain []*types.Header, checkFreq int)
// Generate the list of seal verification requests, and start the parallel verifier
seals := make([]bool, len(chain))
for i := 0; i < len(seals)/checkFreq; i++ {
index := i*checkFreq + hc.rand.Intn(checkFreq)
if index >= len(seals) {
index = len(seals) - 1
if checkFreq != 0 {
// In case of checkFreq == 0 all seals are left false.
for i := 0; i < len(seals)/checkFreq; i++ {
index := i*checkFreq + hc.rand.Intn(checkFreq)
if index >= len(seals) {
index = len(seals) - 1
}
seals[index] = true
}
seals[index] = true
// Last should always be verified to avoid junk.
seals[len(seals)-1] = true
}
seals[len(seals)-1] = true // Last should always be verified to avoid junk
abort, results := hc.engine.VerifyHeaders(hc, chain, seals)
defer close(abort)