46 lines
1.6 KiB
Go
46 lines
1.6 KiB
Go
package netmap
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import (
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/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 the latest network map.
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// It returns the pointer to the 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 the 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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// GetNetMapByEpoch reads network map by the epoch number from the storage.
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// It returns the pointer to the requested network map and any error encountered.
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//
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// Must return exactly one non-nil value.
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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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GetNetMapByEpoch(epoch uint64) (*netmap.NetMap, error)
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// Epoch reads the current epoch from the storage.
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// It returns thw number of the current epoch and any error encountered.
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//
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// Must return exactly one non-default value.
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Epoch() (uint64, error)
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}
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// GetLatestNetworkMap requests and returns the latest network map from the 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 the latest network map from the 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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