| package ingestion |
| |
| import ( |
| "context" |
| "errors" |
| "io" |
| ) |
| |
| var ( |
| // IgnoreResultsFileErr can be returned by the Process function of a processor to |
| // indicated that this file should be considered ignored. It is up to the processor |
| // to write to the log. |
| IgnoreResultsFileErr = errors.New("Ignore this file.") |
| ) |
| |
| // Source defines an ingestion source that returns lists of result files |
| // either through polling or in an event driven mode. |
| type Source interface { |
| // ID returns a unique identifier for this source. |
| ID() string |
| |
| // Poll returns a channel to read all the result files that originated between |
| // the given timestamps in seconds since the epoch. |
| Poll(startTime, endTime int64) <-chan ResultFileLocation |
| |
| // SetEventChannel configures storage events and sets up routines to send |
| // new results to the given channel. |
| SetEventChannel(resultCh chan<- ResultFileLocation) error |
| } |
| |
| // ResultFileLocation is an abstract interface to a file like object that |
| // contains results that need to be ingested. |
| type ResultFileLocation interface { |
| // Open returns a reader that allows to read the content of the file. |
| Open() (io.ReadCloser, error) |
| |
| // Name returns the full path of the file. The last segment is usually the |
| // the file name. |
| Name() string |
| |
| // StorageIDs return the bucket and object ID for the given location. |
| StorageIDs() (string, string) |
| |
| // MD5 returns the MD5 hash of the content of the file. |
| MD5() string |
| |
| // TimeStamp returns the timestamp when the file was last updated. |
| TimeStamp() int64 |
| |
| // Content returns the content of the file if has been read or nil otherwise. |
| Content() []byte |
| } |
| |
| // Processor is the core of an Ingester. It takes instances of ResultFileLocation |
| // and ingests them. It is responsible for the storage of ingested data. |
| type Processor interface { |
| // Process ingests a single result file. |
| Process(ctx context.Context, resultsFile ResultFileLocation) error |
| } |
| |
| // IngestionStore keeps track of files being ingested based on their MD5 hashes. |
| type IngestionStore interface { |
| // SetResultFileHash indicates that we have ingested the given filename |
| // with the given md5hash. |
| // TODO(kjlubick) add context.Context to this interface |
| SetResultFileHash(fileName, md5 string) error |
| |
| // ContainsResultFileHash returns true if the provided file and md5 hash |
| // were previously set with SetResultFileHash. |
| ContainsResultFileHash(fileName, md5 string) (bool, error) |
| } |