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Redesign gossip package to refine the API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| /* | ||
| Copyright 2018-2019 Banco Bilbao Vizcaya Argentaria, S.A. | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| 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. | ||
| */ | ||
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| package auditor | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
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| "github.com/bbva/qed/gossip" | ||
| "github.com/bbva/qed/hashing" | ||
| "github.com/bbva/qed/log" | ||
| "github.com/bbva/qed/protocol" | ||
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| "github.com/prometheus/client_golang/prometheus" | ||
| ) | ||
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| var ( | ||
| QedAuditorInstancesCount = prometheus.NewGauge( | ||
| prometheus.GaugeOpts{ | ||
| Name: "qed_auditor_instances_count", | ||
| Help: "Number of auditor agents running.", | ||
| }, | ||
| ) | ||
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| QedAuditorBatchesProcessSeconds = prometheus.NewSummary( | ||
| prometheus.SummaryOpts{ | ||
| Name: "qed_auditor_batches_process_seconds", | ||
| Help: "Duration of Auditor batch processing", | ||
| }, | ||
| ) | ||
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| QedAuditorBatchesReceivedTotal = prometheus.NewCounter( | ||
| prometheus.CounterOpts{ | ||
| Name: "qed_auditor_batches_received_total", | ||
| Help: "Number of batches received by auditors.", | ||
| }, | ||
| ) | ||
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| QedAuditorGetMembershipProofErrTotal = prometheus.NewCounter( | ||
| prometheus.CounterOpts{ | ||
| Name: "qed_auditor_get_membership_proof_err_total", | ||
| Help: "Number of errors trying to get membership proofs by auditors.", | ||
| }, | ||
| ) | ||
| ) | ||
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| type Auditor struct{} | ||
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| func (a Auditor) Metrics() []prometheus.Collector { | ||
| return []prometheus.Collector{ | ||
| QedAuditorInstancesCount, | ||
| QedAuditorBatchesProcessSeconds, | ||
| QedAuditorBatchesReceivedTotal, | ||
| QedAuditorGetMembershipProofErrTotal, | ||
| } | ||
| } | ||
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| func (a Auditor) Process(agent *gossip.Agent, ctx context.Context) error { | ||
| QedAuditorBatchesReceivedTotal.Inc() | ||
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| qed := agent.Qed() | ||
| store := agent.SnapshotStore() | ||
| b := ctx.Value("batch").(*protocol.BatchSnapshots) | ||
| s := b.Snapshots[0] | ||
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| return agent.Task(func() error { | ||
| timer := prometheus.NewTimer(QedAuditorBatchesProcessSeconds) | ||
| defer timer.ObserveDuration() | ||
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| proof, err := qed.MembershipDigest(s.Snapshot.EventDigest, s.Snapshot.Version) | ||
| if err != nil { | ||
| log.Infof("Auditor is unable to get membership proof from QED server: %v", err) | ||
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| switch fmt.Sprintf("%T", err) { | ||
| case "*errors.errorString": | ||
| agent.Alert(fmt.Sprintf("Auditor is unable to get membership proof from QED server: %v", err)) | ||
| default: | ||
| QedAuditorGetMembershipProofErrTotal.Inc() | ||
| } | ||
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| return err | ||
| } | ||
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| storedSnap, err := store.GetSnapshot(proof.CurrentVersion) | ||
| if err != nil { | ||
| log.Infof("Unable to get snapshot from storage: %v", err) | ||
| return err | ||
| } | ||
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| checkSnap := &protocol.Snapshot{ | ||
| HistoryDigest: s.Snapshot.HistoryDigest, | ||
| HyperDigest: storedSnap.Snapshot.HyperDigest, | ||
| Version: s.Snapshot.Version, | ||
| EventDigest: s.Snapshot.EventDigest, | ||
| } | ||
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| ok := qed.DigestVerify(proof, checkSnap, hashing.NewSha256Hasher) | ||
| if !ok { | ||
| agent.Alert(fmt.Sprintf("Unable to verify snapshot %v", s.Snapshot)) | ||
| log.Infof("Unable to verify snapshot %v", s.Snapshot) | ||
| } | ||
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| log.Infof("MembershipTask.Do(): Snapshot %v has been verified by QED", s.Snapshot) | ||
| return nil | ||
| }) | ||
| } |
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