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add a fetcher constructor for the case where we already have a session #26

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Oct 21, 2021
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add a fetcher constructor for the case where we already have a session #26

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6 changes: 5 additions & 1 deletion impl/blockservice/fetcher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -39,11 +39,15 @@ func NewFetcherConfig(blockService blockservice.BlockService) FetcherConfig {
// NewSession creates a session from which nodes may be retrieved.
// The session ends when the provided context is canceled.
func (fc FetcherConfig) NewSession(ctx context.Context) fetcher.Fetcher {
return fc.FetcherWithSession(ctx, blockservice.NewSession(ctx, fc.blockService))
}

func (fc FetcherConfig) FetcherWithSession(ctx context.Context, s *blockservice.Session) fetcher.Fetcher {
ls := cidlink.DefaultLinkSystem()
// while we may be loading blocks remotely, they are already hash verified by the time they load
// into ipld-prime
ls.TrustedStorage = true
ls.StorageReadOpener = blockOpener(ctx, blockservice.NewSession(ctx, fc.blockService))
ls.StorageReadOpener = blockOpener(ctx, s)
ls.NodeReifier = fc.NodeReifier

protoChooser := fc.PrototypeChooser
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