45 lines
1.6 KiB
Go
45 lines
1.6 KiB
Go
// Package descendalloc implements an ipfscluster.PinAllocator returns
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// allocations based on sorting the metrics in descending order. Thus, peers
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// with largest metrics are first in the list. This allocator can be used with a
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// number of informers, as long as they provide a numeric metric value.
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package descendalloc
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import (
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"context"
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"github.com/ipfs/ipfs-cluster/allocator/util"
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"github.com/ipfs/ipfs-cluster/api"
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cid "github.com/ipfs/go-cid"
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logging "github.com/ipfs/go-log"
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peer "github.com/libp2p/go-libp2p-core/peer"
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rpc "github.com/libp2p/go-libp2p-gorpc"
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)
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var logger = logging.Logger("descendalloc")
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// DescendAllocator extends the SimpleAllocator
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type DescendAllocator struct{}
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// NewAllocator returns an initialized DescendAllocator
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func NewAllocator() DescendAllocator {
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return DescendAllocator{}
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}
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// SetClient does nothing in this allocator
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func (alloc DescendAllocator) SetClient(c *rpc.Client) {}
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// Shutdown does nothing in this allocator
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func (alloc DescendAllocator) Shutdown(_ context.Context) error { return nil }
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// Allocate returns where to allocate a pin request based on metrics which
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// carry a numeric value such as "used disk". We do not pay attention to
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// the metrics of the currently allocated peers and we just sort the
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// candidates based on their metric values (largest to smallest).
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func (alloc DescendAllocator) Allocate(ctx context.Context, c cid.Cid, current, candidates, priority map[peer.ID]*api.Metric) ([]peer.ID, error) {
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// sort our metrics
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first := util.SortNumeric(priority, true)
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last := util.SortNumeric(candidates, true)
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return append(first, last...), nil
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}
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