frostfs-node/pkg/services/object/get/container.go

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package getsvc
import (
"context"
"go.uber.org/zap"
)
func (exec *execCtx) executeOnContainer() {
if exec.isLocal() {
exec.log.Debug("return result directly")
return
}
lookupDepth := exec.netmapLookupDepth()
exec.log.Debug("trying to execute in container...",
zap.Uint64("netmap lookup depth", lookupDepth),
)
// initialize epoch number
ok := exec.initEpoch()
if !ok {
return
}
for {
if exec.processCurrentEpoch() {
break
}
// check the maximum depth has been reached
if lookupDepth == 0 {
break
}
lookupDepth--
// go to the previous epoch
exec.curProcEpoch--
}
}
func (exec *execCtx) processCurrentEpoch() bool {
exec.log.Debug("process epoch",
zap.Uint64("number", exec.curProcEpoch),
)
traverser, ok := exec.generateTraverser(exec.address())
if !ok {
return true
}
ctx, cancel := context.WithCancel(exec.context())
defer cancel()
exec.status = statusUndefined
for {
addrs := traverser.Next()
if len(addrs) == 0 {
exec.log.Debug("no more nodes, abort placement iteration")
return false
}
for i := range addrs {
select {
case <-ctx.Done():
exec.log.Debug("interrupt placement iteration by context",
zap.String("error", ctx.Err().Error()),
)
return true
default:
}
// TODO: consider parallel execution
// TODO: consider optimization: if status == SPLIT we can continue until
// we reach the best result - split info with linking object ID.
if exec.processNode(ctx, addrs[i]) {
exec.log.Debug("completing the operation")
return true
}
}
}
}