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🌱 [cron] generalize some of the transfer logic so it is easy to build…
… new transfer agents (ossf#2454) * Generalize the transfer logic so it is easy to build new transfer agents This change moves code that reads shards and produces summaries into the data package so that it can be reused to create new transfer agents, similar to the BigQuery transfer agent in cron/internal/bq. Signed-off-by: Caleb Brown <calebbrown@google.com> * Lint fix and commentary. Signed-off-by: Caleb Brown <calebbrown@google.com> Signed-off-by: Caleb Brown <calebbrown@google.com> Signed-off-by: nathaniel.wert <nathaniel.wert@kudelskisecurity.com>
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| // Copyright 2021 Security Scorecard Authors | ||
| // | ||
| // 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. | ||
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| package data | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
| "time" | ||
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| "google.golang.org/protobuf/encoding/protojson" | ||
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| "github.com/ossf/scorecard/v4/cron/config" | ||
| ) | ||
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| // ShardSummary is a summary of information about a set of shards with the same | ||
| // creation time. | ||
| type ShardSummary struct { | ||
| creationTime time.Time | ||
| shardMetadata []byte | ||
| shardsExpected int | ||
| shardsCreated int | ||
| isTransferred bool | ||
| } | ||
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| // IsCompleted checks if the percentage of completed shards is over the desired completion threshold. | ||
| // It also returns false to prevent transfers in cases where the expected number of shards is 0, | ||
| // as either the .shard_metadata file is missing, or there is nothing to transfer anyway. | ||
| func (s *ShardSummary) IsCompleted(completionThreshold float64) bool { | ||
| completedPercentage := float64(s.shardsCreated) / float64(s.shardsExpected) | ||
| return s.shardsExpected > 0 && completedPercentage >= completionThreshold | ||
| } | ||
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| // IsTransferred returns true if the shards have already been transferred. | ||
| // A true value indicates that a transfer should not occur, a false value | ||
| // indicates that a transfer should occur if IsCompleted() also returns true. | ||
| func (s *ShardSummary) IsTransferred() bool { | ||
| return s.isTransferred | ||
| } | ||
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| // Metadata returns the raw metadata about the bucket. | ||
| func (s *ShardSummary) Metadata() []byte { | ||
| return s.shardMetadata | ||
| } | ||
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| // CreationTime returns the time the shards were created. This corresponds to | ||
| // the job time generated by the controller. | ||
| func (s *ShardSummary) CreationTime() time.Time { | ||
| return s.creationTime | ||
| } | ||
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| func (s *ShardSummary) MarkTransferred(ctx context.Context, bucketURL string) error { | ||
| transferStatusFilename := GetTransferStatusFilename(s.creationTime) | ||
| if err := WriteToBlobStore(ctx, bucketURL, transferStatusFilename, nil); err != nil { | ||
| return fmt.Errorf("error during WriteToBlobStore: %w", err) | ||
| } | ||
| return nil | ||
| } | ||
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| // BucketSummary contains details about all the shards in a bucket grouped by | ||
| // their creation time. | ||
| type BucketSummary struct { | ||
| shards map[time.Time]*ShardSummary | ||
| } | ||
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| func (summary *BucketSummary) getOrCreate(t time.Time) *ShardSummary { | ||
| if summary.shards[t] == nil { | ||
| summary.shards[t] = &ShardSummary{ | ||
| creationTime: t, | ||
| } | ||
| } | ||
| return summary.shards[t] | ||
| } | ||
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| // Shards returns a slice of ShardSummary instances for each shard creation time. | ||
| func (summary *BucketSummary) Shards() []*ShardSummary { | ||
| var shards []*ShardSummary | ||
| for _, s := range summary.shards { | ||
| shards = append(shards, s) | ||
| } | ||
| return shards | ||
| } | ||
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| // GetBucketSummary iterates through all files in a bucket and returns a | ||
| // BucketSummary with details on each set of shards grouped by creation time. | ||
| func GetBucketSummary(ctx context.Context, bucketURL string) (*BucketSummary, error) { | ||
| keys, err := GetBlobKeys(ctx, bucketURL) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error getting BlobKeys: %w", err) | ||
| } | ||
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| summary := BucketSummary{ | ||
| shards: make(map[time.Time]*ShardSummary), | ||
| } | ||
| for _, key := range keys { | ||
| creationTime, filename, err := ParseBlobFilename(key) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error parsing Blob key: %w", err) | ||
| } | ||
| switch { | ||
| case strings.HasPrefix(filename, "shard-"): | ||
| summary.getOrCreate(creationTime).shardsCreated++ | ||
| case filename == config.TransferStatusFilename: | ||
| summary.getOrCreate(creationTime).isTransferred = true | ||
| case filename == config.ShardMetadataFilename: | ||
| keyData, err := GetBlobContent(ctx, bucketURL, key) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error during GetBlobContent: %w", err) | ||
| } | ||
| var metadata ShardMetadata | ||
| if err := protojson.Unmarshal(keyData, &metadata); err != nil { | ||
| return nil, fmt.Errorf("error parsing data as ShardMetadata: %w", err) | ||
| } | ||
| summary.getOrCreate(creationTime).shardsExpected = int(metadata.GetNumShard()) | ||
| summary.getOrCreate(creationTime).shardMetadata = keyData | ||
| default: | ||
| //nolint: goerr113 | ||
| return nil, fmt.Errorf("found unrecognized file: %s", key) | ||
| } | ||
| } | ||
| return &summary, nil | ||
| } |
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