76158d24ab
Major changes: ```go type ScanFunc func(r *Record) error ``` * Simplify the callback func signature by removing `ScanStatus` * Leverage context for cancellation * Add custom error `SkipCheckpoint` for special cases when we don't want to checkpoint Minor changes: * Use kinesis package constants for shard iterator types * Move optional config to new file See conversation on #75 for more details
68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
package main
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import (
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"context"
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"expvar"
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"flag"
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"fmt"
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"log"
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"os"
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"os/signal"
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consumer "github.com/harlow/kinesis-consumer"
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checkpoint "github.com/harlow/kinesis-consumer/checkpoint/postgres"
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)
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func main() {
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var (
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app = flag.String("app", "", "Consumer app name")
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stream = flag.String("stream", "", "Stream name")
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table = flag.String("table", "", "Table name")
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connStr = flag.String("connection", "", "Connection Str")
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)
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flag.Parse()
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// postgres checkpoint
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ck, err := checkpoint.New(*app, *table, *connStr)
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if err != nil {
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log.Fatalf("checkpoint error: %v", err)
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}
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var counter = expvar.NewMap("counters")
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// consumer
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c, err := consumer.New(
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*stream,
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consumer.WithCheckpoint(ck),
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consumer.WithCounter(counter),
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)
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if err != nil {
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log.Fatalf("consumer error: %v", err)
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}
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// use cancel func to signal shutdown
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ctx, cancel := context.WithCancel(context.Background())
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// trap SIGINT, wait to trigger shutdown
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, os.Interrupt)
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go func() {
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<-signals
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cancel()
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}()
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// scan stream
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err = c.Scan(ctx, func(r *consumer.Record) error {
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fmt.Println(string(r.Data))
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return nil // continue scanning
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})
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if err != nil {
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log.Fatalf("scan error: %v", err)
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}
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if err := ck.Shutdown(); err != nil {
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log.Fatalf("checkpoint shutdown error: %v", err)
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}
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}
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