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contentenc: move parallel encryption into encryptBlocksParallel

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Make the logic self-contained in the new helper function.
This commit is contained in:
Jakob Unterwurzacher 2020-02-15 15:49:12 +01:00
parent a92db18fe7
commit 9aeb2a3df6
1 changed files with 27 additions and 21 deletions
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48
internal/contentenc/content.go
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@ -204,33 +204,39 @@ func (be *ContentEnc) DecryptBlock(ciphertext []byte, blockNo uint64, fileID []b
// 2 seems to work ok for now.
const encryptMaxSplit = 2
// encryptBlocksParallel splits the plaintext into parts and encrypts them
// in parallel.
func (be *ContentEnc) encryptBlocksParallel(plaintextBlocks [][]byte, ciphertextBlocks [][]byte, firstBlockNo uint64, fileID []byte) {
ncpu := runtime.NumCPU()
if ncpu > encryptMaxSplit {
ncpu = encryptMaxSplit
}
groupSize := len(plaintextBlocks) / ncpu
var wg sync.WaitGroup
for i := 0; i < ncpu; i++ {
wg.Add(1)
go func(i int) {
low := i * groupSize
high := (i + 1) * groupSize
if i == ncpu-1 {
// Last group, pick up any left-over blocks
high = len(plaintextBlocks)
}
be.doEncryptBlocks(plaintextBlocks[low:high], ciphertextBlocks[low:high], firstBlockNo+uint64(low), fileID)
wg.Done()
}(i)
}
wg.Wait()
}
// EncryptBlocks is like EncryptBlock but takes multiple plaintext blocks.
// Returns a byte slice from CReqPool - so don't forget to return it
// to the pool.
func (be *ContentEnc) EncryptBlocks(plaintextBlocks [][]byte, firstBlockNo uint64, fileID []byte) []byte {
ciphertextBlocks := make([][]byte, len(plaintextBlocks))
// For large writes, we parallelize encryption.
if len(plaintextBlocks) >= 32 {
ncpu := runtime.NumCPU()
if ncpu > encryptMaxSplit {
ncpu = encryptMaxSplit
}
groupSize := len(plaintextBlocks) / ncpu
var wg sync.WaitGroup
for i := 0; i < ncpu; i++ {
wg.Add(1)
go func(i int) {
low := i * groupSize
high := (i + 1) * groupSize
if i == ncpu-1 {
// Last group, pick up any left-over blocks
high = len(plaintextBlocks)
}
be.doEncryptBlocks(plaintextBlocks[low:high], ciphertextBlocks[low:high], firstBlockNo+uint64(low), fileID)
wg.Done()
}(i)
}
wg.Wait()
if len(plaintextBlocks) >= 32 && runtime.NumCPU() >= 2 {
be.encryptBlocksParallel(plaintextBlocks, ciphertextBlocks, firstBlockNo, fileID)
} else {
be.doEncryptBlocks(plaintextBlocks, ciphertextBlocks, firstBlockNo, fileID)
}