forked from TrueCloudLab/frostfs-api-go
81 lines
2.6 KiB
Go
81 lines
2.6 KiB
Go
package netmap
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"github.com/nspcc-dev/hrw"
|
|
"github.com/nspcc-dev/neofs-api-go/v2/netmap"
|
|
)
|
|
|
|
// Context contains references to named filters and cached numeric values.
|
|
type Context struct {
|
|
// Netmap is a netmap structure to operate on.
|
|
Netmap *Netmap
|
|
// Filters stores processed filters.
|
|
Filters map[string]*netmap.Filter
|
|
// Selectors stores processed selectors.
|
|
Selectors map[string]*netmap.Selector
|
|
// Selections stores result of selector processing.
|
|
Selections map[string][]Nodes
|
|
|
|
// numCache stores parsed numeric values.
|
|
numCache map[*netmap.Filter]uint64
|
|
// pivot is a seed for HRW.
|
|
pivot []byte
|
|
// pivotHash is a saved HRW hash of pivot
|
|
pivotHash uint64
|
|
// aggregator is returns aggregator determining bucket weight.
|
|
// By default it returns mean value from IQR interval.
|
|
aggregator func() aggregator
|
|
// weightFunc is a weighting function for determining node priority.
|
|
// By default in combines favours low price and high capacity.
|
|
weightFunc weightFunc
|
|
}
|
|
|
|
// Various validation errors.
|
|
var (
|
|
ErrMissingField = errors.New("netmap: nil field")
|
|
ErrInvalidFilterName = errors.New("netmap: filter name is invalid")
|
|
ErrInvalidNumber = errors.New("netmap: number value expected")
|
|
ErrInvalidFilterOp = errors.New("netmap: invalid filter operation")
|
|
ErrFilterNotFound = errors.New("netmap: filter not found")
|
|
ErrNonEmptyFilters = errors.New("netmap: simple filter must no contain sub-filters")
|
|
ErrNotEnoughNodes = errors.New("netmap: not enough nodes to SELECT from")
|
|
ErrSelectorNotFound = errors.New("netmap: selector not found")
|
|
ErrUnnamedTopFilter = errors.New("netmap: all filters on top level must be named")
|
|
)
|
|
|
|
// NewContext creates new context. It contains various caches.
|
|
// In future it may create hierarchical netmap structure to work with.
|
|
func NewContext(nm *Netmap) *Context {
|
|
return &Context{
|
|
Netmap: nm,
|
|
Filters: make(map[string]*netmap.Filter),
|
|
Selectors: make(map[string]*netmap.Selector),
|
|
Selections: make(map[string][]Nodes),
|
|
|
|
numCache: make(map[*netmap.Filter]uint64),
|
|
aggregator: newMeanIQRAgg,
|
|
weightFunc: GetDefaultWeightFunc(nm.Nodes),
|
|
}
|
|
}
|
|
|
|
func (c *Context) setPivot(pivot []byte) {
|
|
if len(pivot) != 0 {
|
|
c.pivot = pivot
|
|
c.pivotHash = hrw.Hash(pivot)
|
|
}
|
|
}
|
|
|
|
// GetDefaultWeightFunc returns default weighting function.
|
|
func GetDefaultWeightFunc(ns Nodes) weightFunc {
|
|
mean := newMeanAgg()
|
|
min := newMinAgg()
|
|
for i := range ns {
|
|
mean.Add(float64(ns[i].Capacity))
|
|
min.Add(float64(ns[i].Price))
|
|
}
|
|
return newWeightFunc(
|
|
newSigmoidNorm(mean.Compute()),
|
|
newReverseMinNorm(min.Compute()))
|
|
}
|