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Resolve 175 race condition, no change to hook timing (#178)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package responsemanager | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
|
|
||
| "github.com/ipfs/go-cid" | ||
| "github.com/ipfs/go-graphsync" | ||
| "github.com/ipfs/go-graphsync/cidset" | ||
| "github.com/ipfs/go-graphsync/dedupkey" | ||
| "github.com/ipfs/go-graphsync/ipldutil" | ||
| gsmsg "github.com/ipfs/go-graphsync/message" | ||
| "github.com/ipfs/go-graphsync/notifications" | ||
| "github.com/ipfs/go-graphsync/responsemanager/responseassembler" | ||
| ipld "github.com/ipld/go-ipld-prime" | ||
| cidlink "github.com/ipld/go-ipld-prime/linking/cid" | ||
| "github.com/libp2p/go-libp2p-core/peer" | ||
| ) | ||
|
|
||
| type queryPreparer struct { | ||
| requestHooks RequestHooks | ||
| responseAssembler ResponseAssembler | ||
| loader ipld.Loader | ||
| } | ||
|
|
||
| func (qe *queryPreparer) prepareQuery(ctx context.Context, | ||
| p peer.ID, | ||
| request gsmsg.GraphSyncRequest, signals signals, sub *notifications.TopicDataSubscriber) (ipld.Loader, ipldutil.Traverser, bool, error) { | ||
| log.Infof("Processing request hooks for request: %d", request.ID()) | ||
| result := qe.requestHooks.ProcessRequestHooks(p, request) | ||
| var transactionError error | ||
| var isPaused bool | ||
| failNotifee := notifications.Notifee{Data: graphsync.RequestFailedUnknown, Subscriber: sub} | ||
| err := qe.responseAssembler.Transaction(p, request.ID(), func(rb responseassembler.ResponseBuilder) error { | ||
| for _, extension := range result.Extensions { | ||
| rb.SendExtensionData(extension) | ||
| } | ||
| if result.Err != nil || !result.IsValidated { | ||
| rb.FinishWithError(graphsync.RequestFailedUnknown) | ||
| rb.AddNotifee(failNotifee) | ||
| transactionError = errors.New("request not valid") | ||
| } else if result.IsPaused { | ||
| rb.PauseRequest() | ||
| isPaused = true | ||
| } | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, nil, false, err | ||
| } | ||
| if transactionError != nil { | ||
| return nil, nil, false, transactionError | ||
| } | ||
| if err := qe.processDedupByKey(request, p, failNotifee); err != nil { | ||
| return nil, nil, false, err | ||
| } | ||
| if err := qe.processDoNoSendCids(request, p, failNotifee); err != nil { | ||
| return nil, nil, false, err | ||
| } | ||
| rootLink := cidlink.Link{Cid: request.Root()} | ||
| traverser := ipldutil.TraversalBuilder{ | ||
| Root: rootLink, | ||
| Selector: request.Selector(), | ||
| Chooser: result.CustomChooser, | ||
| }.Start(ctx) | ||
| loader := result.CustomLoader | ||
| if loader == nil { | ||
| loader = qe.loader | ||
| } | ||
| return loader, traverser, isPaused, nil | ||
| } | ||
|
|
||
| func (qe *queryPreparer) processDedupByKey(request gsmsg.GraphSyncRequest, p peer.ID, failNotifee notifications.Notifee) error { | ||
| dedupData, has := request.Extension(graphsync.ExtensionDeDupByKey) | ||
| if !has { | ||
| return nil | ||
| } | ||
| key, err := dedupkey.DecodeDedupKey(dedupData) | ||
| if err != nil { | ||
| _ = qe.responseAssembler.Transaction(p, request.ID(), func(rb responseassembler.ResponseBuilder) error { | ||
| rb.FinishWithError(graphsync.RequestFailedUnknown) | ||
| rb.AddNotifee(failNotifee) | ||
| return nil | ||
| }) | ||
| return err | ||
| } | ||
| qe.responseAssembler.DedupKey(p, request.ID(), key) | ||
| return nil | ||
| } | ||
|
|
||
| func (qe *queryPreparer) processDoNoSendCids(request gsmsg.GraphSyncRequest, p peer.ID, failNotifee notifications.Notifee) error { | ||
| doNotSendCidsData, has := request.Extension(graphsync.ExtensionDoNotSendCIDs) | ||
| if !has { | ||
| return nil | ||
| } | ||
| cidSet, err := cidset.DecodeCidSet(doNotSendCidsData) | ||
| if err != nil { | ||
| _ = qe.responseAssembler.Transaction(p, request.ID(), func(rb responseassembler.ResponseBuilder) error { | ||
| rb.FinishWithError(graphsync.RequestFailedUnknown) | ||
| rb.AddNotifee(failNotifee) | ||
| return nil | ||
| }) | ||
| return err | ||
| } | ||
| links := make([]ipld.Link, 0, cidSet.Len()) | ||
| err = cidSet.ForEach(func(c cid.Cid) error { | ||
| links = append(links, cidlink.Link{Cid: c}) | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| qe.responseAssembler.IgnoreBlocks(p, request.ID(), links) | ||
| return nil | ||
| } |
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