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explain when a promise can be canceled in pbdagreader

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License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>
This commit is contained in:
Steven Allen
2018-07-05 17:06:50 -07:00
parent 5c0dc6a968
commit 7fd34048ab
1 changed files with 5 additions and 0 deletions
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5
unixfs/io/pbdagreader.go
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@ -110,6 +110,11 @@ func (dr *PBDagReader) precalcNextBuf(ctx context.Context) error {
// In this case, the context used to *preload* the node has been canceled.
// We need to retry the load with our context and we might as
// well preload some extra nodes while we're at it.
//
// Note: When using `Read`, this code will never execute as
// `Read` will use the global context. It only runs if the user
// explicitly reads with a custom context (e.g., by calling
// `CtxReadFull`).
dr.preload(ctx, dr.linkPosition)
nxt, err = dr.promises[dr.linkPosition].Get(ctx)
dr.promises[dr.linkPosition] = nil