本文整理汇总了Golang中github.com/prometheus/prometheus/storage/raw/leveldb.Iterator.SeekToLast方法的典型用法代码示例。如果您正苦于以下问题：Golang Iterator.SeekToLast方法的具体用法？Golang Iterator.SeekToLast怎么用？Golang Iterator.SeekToLast使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/prometheus/prometheus/storage/raw/leveldb.Iterator的用法示例。
在下文中一共展示了Iterator.SeekToLast方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: newDiskFrontier
func newDiskFrontier(i leveldb.Iterator) (d *diskFrontier, err error) {
if !i.SeekToLast() || i.Key() == nil {
return
}
lastKey, err := extractSampleKey(i)
if err != nil {
panic(err)
}
if !i.SeekToFirst() || i.Key() == nil {
return
}
firstKey, err := extractSampleKey(i)
if i.Key() == nil {
return
}
if err != nil {
panic(err)
}
d = &diskFrontier{}
d.firstFingerprint = model.NewFingerprintFromRowKey(*firstKey.Fingerprint.Signature)
d.firstSupertime = indexable.DecodeTime(firstKey.Timestamp)
d.lastFingerprint = model.NewFingerprintFromRowKey(*lastKey.Fingerprint.Signature)
d.lastSupertime = indexable.DecodeTime(lastKey.Timestamp)
return
}示例2: renderView
func (t *TieredStorage) renderView(viewJob viewJob) {
// Telemetry.
var err error
begin := time.Now()
defer func() {
t.memorySemaphore <- true
duration := time.Since(begin)
recordOutcome(
duration,
err,
map[string]string{operation: renderView, result: success},
map[string]string{operation: renderView, result: failure},
)
}()
view := newView()
var iterator leveldb.Iterator
diskPresent := true
firstBlock, _ := t.sampleKeys.Get()
defer t.sampleKeys.Give(firstBlock)
lastBlock, _ := t.sampleKeys.Get()
defer t.sampleKeys.Give(lastBlock)
sampleKeyDto, _ := t.dtoSampleKeys.Get()
defer t.dtoSampleKeys.Give(sampleKeyDto)
defer func() {
// Give back all ops not yet popped.
for viewJob.builder.HasOp() {
giveBackOp(viewJob.builder.PopOp())
}
}()
extractionTimer := viewJob.stats.GetTimer(stats.ViewDataExtractionTime).Start()
for viewJob.builder.HasOp() {
op := viewJob.builder.PopOp()
defer giveBackOp(op)
fp := op.Fingerprint()
old, err := t.seriesTooOld(fp, op.CurrentTime())
if err != nil {
glog.Errorf("Error getting watermark from cache for %s: %s", fp, err)
continue
}
if old {
continue
}
memValues := t.memoryArena.CloneSamples(fp)
for !op.Consumed() {
// Abort the view rendering if the caller (makeView) has timed out.
if len(viewJob.abort) > 0 {
return
}
// Load data value chunk(s) around the current time.
targetTime := op.CurrentTime()
currentChunk := chunk{}
// If we aimed before the oldest value in memory, load more data from disk.
if (len(memValues) == 0 || memValues.FirstTimeAfter(targetTime)) && diskPresent {
if iterator == nil {
// Get a single iterator that will be used for all data extraction
// below.
iterator, _ = t.DiskStorage.MetricSamples.NewIterator(true)
defer iterator.Close()
if diskPresent = iterator.SeekToLast(); diskPresent {
if err := iterator.Key(sampleKeyDto); err != nil {
panic(err)
}
lastBlock.Load(sampleKeyDto)
if !iterator.SeekToFirst() {
diskPresent = false
} else {
if err := iterator.Key(sampleKeyDto); err != nil {
panic(err)
}
firstBlock.Load(sampleKeyDto)
}
}
}
if diskPresent {
diskTimer := viewJob.stats.GetTimer(stats.ViewDiskExtractionTime).Start()
diskValues, expired := t.loadChunkAroundTime(
iterator,
fp,
targetTime,
firstBlock,
lastBlock,
)
//.........这里部分代码省略.........