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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // Copyright 2021 Google LLC. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // Package tiles is an implementation of a witness feeder for C2SP tlog-tiles compatible logs. | ||
| package tiles | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/http" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "github.com/transparency-dev/formats/log" | ||
| "github.com/transparency-dev/trillian-tessera/client" | ||
| "github.com/transparency-dev/witness/internal/config" | ||
| "github.com/transparency-dev/witness/internal/feeder" | ||
| ) | ||
|
|
||
| // FeedLog periodically feeds checkpoints from the log to the witness. | ||
| // This function returns once the provided context is done. | ||
| func FeedLog(ctx context.Context, l config.Log, w feeder.Witness, c *http.Client, interval time.Duration) error { | ||
| lURL, err := url.Parse(l.URL) | ||
| if err != nil { | ||
| return fmt.Errorf("invalid LogURL %q: %v", l.URL, err) | ||
| } | ||
| f, err := client.NewHTTPFetcher(lURL, c) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create fetcher: %v", err) | ||
| } | ||
|
|
||
| fetchProof := func(ctx context.Context, from, to log.Checkpoint) ([][]byte, error) { | ||
| if from.Size == 0 { | ||
| return [][]byte{}, nil | ||
| } | ||
| pb, err := client.NewProofBuilder(ctx, to, f.ReadTile) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create proof builder for %q: %v", l.Origin, err) | ||
| } | ||
|
|
||
| conP, err := pb.ConsistencyProof(ctx, from.Size, to.Size) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create proof for %q(%d -> %d): %v", l.Origin, from.Size, to.Size, err) | ||
| } | ||
| return conP, nil | ||
| } | ||
|
|
||
| opts := feeder.FeedOpts{ | ||
| LogID: l.ID, | ||
| LogOrigin: l.Origin, | ||
| FetchCheckpoint: f.ReadCheckpoint, | ||
| FetchProof: fetchProof, | ||
| LogSigVerifier: l.Verifier, | ||
| Witness: w, | ||
| } | ||
| if interval > 0 { | ||
| return feeder.Run(ctx, interval, opts) | ||
| } | ||
| _, err = feeder.FeedOnce(ctx, opts) | ||
| return err | ||
| } |
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