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generator.go
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/
generator.go
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/*
Copyright NetFoundry, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package loop3
import (
"crypto/sha512"
"github.com/michaelquigley/pfxlog"
"github.com/openziti/foundation/util/info"
"math/rand"
)
type randomHashedBlockGenerator struct {
count int
minSize int
maxSize int
latencyFreq int
blocks chan Block
pool [][]byte
}
func newRandomHashedBlockGenerator(count, minSize, maxSize, latencyFreq int) *randomHashedBlockGenerator {
g := &randomHashedBlockGenerator{
count: count,
minSize: minSize,
maxSize: maxSize,
latencyFreq: latencyFreq,
blocks: make(chan Block),
pool: newPool(),
}
return g
}
func (g *randomHashedBlockGenerator) run() {
log := pfxlog.Logger()
log.Debug("started")
defer log.Debug("complete")
for i := 0; i < g.count; i++ {
size := g.minSize
distance := g.maxSize - g.minSize
if distance > 0 {
size += rand.Intn(distance)
}
data := make([]byte, size)
for idx := 0; idx < size; {
bucket := g.pool[rand.Intn(len(g.pool))]
for i := 0; i < len(bucket) && idx < size; i++ {
data[idx] = bucket[i]
idx++
}
}
hash := sha512.Sum512(data)
blockType := BlockTypePlain
if g.latencyFreq > 0 && i%g.latencyFreq == 0 {
blockType = BlockTypeLatencyRequest
}
g.blocks <- &RandHashedBlock{
Type: blockType,
Sequence: uint32(i),
Data: data,
Hash: hash[:],
}
}
}
func newPool() [][]byte {
log := pfxlog.Logger()
start := info.NowInMilliseconds()
log.Debug("building")
defer func() {
log.Debugf("complete (%d)", info.NowInMilliseconds()-start)
}()
buckets := 64
pool := make([][]byte, buckets)
for i := 0; i < buckets; i++ {
length := 4096
pool[i] = make([]byte, 0)
for j := 0; j < length; j++ {
pool[i] = append(pool[i], byte(rand.Intn(255)))
}
}
return pool
}
func newSeqGenerator(count, minSize, maxSize int) *seqGenerator {
g := &seqGenerator{
count: count,
minSize: minSize,
maxSize: maxSize,
blocks: make(chan Block),
}
return g
}
func (g *seqGenerator) run() {
log := pfxlog.Logger()
log.Debug("started")
defer log.Debug("complete")
var seq uint64
for i := 0; i < g.count; i++ {
size := g.minSize
distance := g.maxSize - g.minSize
if distance > 0 {
size += rand.Intn(distance)
}
data := make([]byte, size)
for idx := 0; idx < size; idx++ {
data[idx] = byte(seq)
seq++
}
g.blocks <- SeqBlock(data)
}
}
type seqGenerator struct {
count int
minSize int
maxSize int
blocks chan Block
}