forked from TrueCloudLab/frostfs-node
35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
package netmap
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import (
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"errors"
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"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
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)
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// Source is an interface that wraps
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// basic network map receiving method.
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type Source interface {
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// GetNetMap reads the diff-th past network map from the storage.
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// Calling with zero diff returns latest network map.
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// It returns the pointer to requested network map and any error encountered.
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//
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// GetNetMap must return exactly one non-nil value.
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// GetNetMap must return ErrNotFound if the network map is not in storage.
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//
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// Implementations must not retain the network map pointer and modify
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// the network map through it.
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GetNetMap(diff uint64) (*netmap.Netmap, error)
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}
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// ErrNotFound is the error returned when network map was not found in storage.
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var ErrNotFound = errors.New("network map not found")
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// GetLatestNetworkMap requests and returns latest network map from storage.
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func GetLatestNetworkMap(src Source) (*netmap.Netmap, error) {
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return src.GetNetMap(0)
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}
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// GetPreviousNetworkMap requests and returns previous from latest network map from storage.
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func GetPreviousNetworkMap(src Source) (*netmap.Netmap, error) {
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return src.GetNetMap(1)
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}
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