cd71fd41bc
To allow for different logging endpoints we'll introduce a Logger interface that will be passed into the pipeline during initialization. * Add Logger interface * Use logger interface in pipeline and emitters
51 lines
1.7 KiB
Go
51 lines
1.7 KiB
Go
package connector
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import (
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"bytes"
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"fmt"
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"time"
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"github.com/crowdmob/goamz/aws"
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"github.com/crowdmob/goamz/s3"
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)
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// S3Emitter is an implementation of Emitter used to store files from a Kinesis stream in S3.
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//
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// The use of this struct requires the configuration of an S3 bucket/endpoint. When the buffer is full, this
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// struct's Emit method adds the contents of the buffer to S3 as one file. The filename is generated
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// from the first and last sequence numbers of the records contained in that file separated by a
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// dash. This struct requires the configuration of an S3 bucket and endpoint.
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type S3Emitter struct {
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Logger Logger
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S3Bucket string
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}
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// S3FileName generates a file name based on the First and Last sequence numbers from the buffer. The current
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// UTC date (YYYY-MM-DD) is base of the path to logically group days of batches.
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func (e S3Emitter) S3FileName(firstSeq string, lastSeq string) string {
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date := time.Now().UTC().Format("2006/01/02")
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return fmt.Sprintf("%v/%v-%v", date, firstSeq, lastSeq)
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}
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// Emit is invoked when the buffer is full. This method emits the set of filtered records.
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func (e S3Emitter) Emit(b Buffer, t Transformer) {
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auth, _ := aws.EnvAuth()
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s3Con := s3.New(auth, aws.USEast)
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bucket := s3Con.Bucket(e.S3Bucket)
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s3File := e.S3FileName(b.FirstSequenceNumber(), b.LastSequenceNumber())
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var buffer bytes.Buffer
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for _, r := range b.Records() {
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var s = t.FromRecord(r)
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buffer.Write(s)
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}
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err := bucket.Put(s3File, buffer.Bytes(), "text/plain", s3.Private, s3.Options{})
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if err != nil {
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e.Logger.Fatalf("S3Put ERROR: %v\n", err.Error())
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} else {
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e.Logger.Printf("[%v] records emitted to [%s]\n", b.NumRecordsInBuffer(), e.S3Bucket)
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}
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}
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