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assignablecandidatefinder.go
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/
assignablecandidatefinder.go
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package retriever
import (
"context"
"fmt"
"sync/atomic"
"time"
"github.com/benbjohnson/clock"
"github.com/filecoin-project/lassie/pkg/events"
"github.com/filecoin-project/lassie/pkg/internal/candidatebuffer"
"github.com/filecoin-project/lassie/pkg/types"
)
type FilterIndexerCandidate func(types.RetrievalCandidate) (bool, types.RetrievalCandidate)
// AssignableCandidateFinder finds and filters candidates for a given retrieval
type AssignableCandidateFinder struct {
filterIndexerCandidate FilterIndexerCandidate
candidateSource types.CandidateSource
clock clock.Clock
}
const BufferWindow = 5 * time.Millisecond
func NewAssignableCandidateFinder(candidateSource types.CandidateSource, filterIndexerCandidate FilterIndexerCandidate) AssignableCandidateFinder {
return NewAssignableCandidateFinderWithClock(candidateSource, filterIndexerCandidate, clock.New())
}
func NewAssignableCandidateFinderWithClock(candidateSource types.CandidateSource, filterIndexerCandidate FilterIndexerCandidate, clock clock.Clock) AssignableCandidateFinder {
return AssignableCandidateFinder{candidateSource: candidateSource, filterIndexerCandidate: filterIndexerCandidate, clock: clock}
}
func (acf AssignableCandidateFinder) FindCandidates(ctx context.Context, request types.RetrievalRequest, eventsCallback func(types.RetrievalEvent), onCandidates func([]types.RetrievalCandidate)) error {
ctx, cancelCtx := context.WithCancel(ctx)
defer cancelCtx()
eventsCallback(events.StartedFindingCandidates(acf.clock.Now(), request.RetrievalID, request.Root))
var totalCandidates atomic.Uint64
candidateBuffer := candidatebuffer.NewCandidateBuffer(func(candidates []types.RetrievalCandidate) {
eventsCallback(events.CandidatesFound(acf.clock.Now(), request.RetrievalID, request.Root, candidates))
acceptableCandidates := make([]types.RetrievalCandidate, 0)
for _, candidate := range candidates {
hasFilterCandidateFn := acf.filterIndexerCandidate != nil
keepCandidate := true
if hasFilterCandidateFn {
keepCandidate, candidate = acf.filterIndexerCandidate(candidate)
}
if keepCandidate {
acceptableCandidates = append(acceptableCandidates, candidate)
}
}
if len(acceptableCandidates) == 0 {
return
}
eventsCallback(events.CandidatesFiltered(acf.clock.Now(), request.RetrievalID, request.Root, acceptableCandidates))
totalCandidates.Add(uint64(len(acceptableCandidates)))
onCandidates(acceptableCandidates)
}, acf.clock)
candidateSource := acf.candidateSource
if len(request.Providers) > 0 {
candidateSource = NewDirectCandidateSource(request.Providers)
}
err := candidateBuffer.BufferStream(ctx, func(ctx context.Context, onNextCandidate candidatebuffer.OnNextCandidate) error {
return candidateSource.FindCandidates(ctx, request.Root, onNextCandidate)
}, BufferWindow)
if err != nil {
eventsCallback(events.Failed(acf.clock.Now(), request.RetrievalID, types.RetrievalCandidate{RootCid: request.Root}, err.Error()))
return fmt.Errorf("could not get retrieval candidates for %s: %w", request.Root, err)
}
if totalCandidates.Load() == 0 {
eventsCallback(events.Failed(acf.clock.Now(), request.RetrievalID, types.RetrievalCandidate{RootCid: request.Root}, ErrNoCandidates.Error()))
return ErrNoCandidates
}
return nil
}