diff options
Diffstat (limited to 'go')
| -rw-r--r-- | go/Makefile | 8 | ||||
| -rw-r--r-- | go/README.md | 11 | ||||
| -rw-r--r-- | go/consumer.go | 101 | ||||
| -rw-r--r-- | go/getting-started.properties | 2 | ||||
| -rw-r--r-- | go/go.mod | 5 | ||||
| -rw-r--r-- | go/go.sum | 213 | ||||
| -rw-r--r-- | go/init.sql | 0 | ||||
| -rw-r--r-- | go/producer.go | 64 | ||||
| -rw-r--r-- | go/util/util.go | 41 |
9 files changed, 445 insertions, 0 deletions
diff --git a/go/Makefile b/go/Makefile new file mode 100644 index 0000000..093da5e --- /dev/null +++ b/go/Makefile @@ -0,0 +1,8 @@ +all: out/producer out/consumer + +out/producer out/consumer: $(wildcard *.go) + @echo $@ + @go build -o $@ $(patsubst out/%,%.go,$@) + +clean: + rm -f out/producer out/consumer diff --git a/go/README.md b/go/README.md new file mode 100644 index 0000000..0cf77f8 --- /dev/null +++ b/go/README.md @@ -0,0 +1,11 @@ +* Docker compose: https://github.com/confluentinc/cp-all-in-one/blob/7.5.3-post/cp-all-in-one-kraft/docker-compose.yml +* Demo: https://developer.confluent.io/get-started/go + +# Start services + + . .settings.sh + docker-compose up -d + +Available services: + + * Control center: http://localhost:9021 diff --git a/go/consumer.go b/go/consumer.go new file mode 100644 index 0000000..4047c4e --- /dev/null +++ b/go/consumer.go @@ -0,0 +1,101 @@ +package main + +import ( + "fmt" + "github.com/confluentinc/confluent-kafka-go/v2/kafka" + "kafka-sandbox/util" + "log" + "os" + "os/signal" + "syscall" +) + +func main() { + if len(os.Args) != 2 { + fmt.Fprintf(os.Stderr, "Usage: %s <config-file-path>\n", + os.Args[0]) + os.Exit(1) + } + + configFile := os.Args[1] + conf := util.ReadConfig(configFile) + conf["group.id"] = "kafka-go-getting-started" + conf["auto.offset.reset"] = "earliest" + + c, err := kafka.NewConsumer(&conf) + if err != nil { + fmt.Printf("Failed to create consumer: %s", err) + os.Exit(1) + } + + topic := "purchases" + err = c.SubscribeTopics([]string{topic}, nil) + // Set up a channel for handling Ctrl-C, etc + sigchan := make(chan os.Signal, 1) + signal.Notify(sigchan, syscall.SIGINT, syscall.SIGTERM) + + // Process messages + run := true + for run { + select { + case sig := <-sigchan: + fmt.Printf("Caught signal %v: terminating\n", sig) + run = false + default: + ev := c.Poll(100) + if ev == nil { + continue + } + + switch e := ev.(type) { + case *kafka.Message: + if e.TopicPartition.Error != nil { + onTopicPartitionError(e) + } else { + onMessage(e) + } + case kafka.OffsetsCommitted: + log.Println("Offsets committed") + for i, offset := range e.Offsets { + log.Printf(" %d: %s\n", i, offset.String()) + } + case kafka.Error: + log.Fatalln(e) + default: + log.Printf("Unhandled message type: %s\n", e.String()) + } + } + } + + c.Close() +} + +func onMessage(ev *kafka.Message) { + fmt.Printf("-------- %s\n", ev.TopicPartition.String()) + fmt.Printf("%s %s: %s\n", + ev.TimestampType.String(), + ev.Timestamp.String(), + string(ev.Key)) + for _, header := range ev.Headers { + fmt.Printf("%s: %s\n", header.Key, string(header.Value)) + } + fmt.Printf("%s\n", string(ev.Value)) +} + +func onTopicPartitionError(e *kafka.Message) { + fmt.Printf("Partition error: %s\n", e.TopicPartition.String()) +} + +func showAssignment(err error, c *kafka.Consumer) error { + partitions, err := c.Assignment() + if err != nil { + return err + } + + fmt.Printf("Consuming %d partitions: \n", len(partitions)) + for i, partition := range partitions { + fmt.Printf(" #%d: %s\n", i+1, partition.String()) + } + + return nil +} diff --git a/go/getting-started.properties b/go/getting-started.properties new file mode 100644 index 0000000..467d1c4 --- /dev/null +++ b/go/getting-started.properties @@ -0,0 +1,2 @@ +bootstrap.servers=localhost + diff --git a/go/go.mod b/go/go.mod new file mode 100644 index 0000000..8cedea6 --- /dev/null +++ b/go/go.mod @@ -0,0 +1,5 @@ +module kafka-sandbox + +go 1.22 + +require github.com/confluentinc/confluent-kafka-go/v2 v2.3.0 diff --git a/go/go.sum b/go/go.sum new file mode 100644 index 0000000..a9c2f29 --- /dev/null +++ b/go/go.sum @@ -0,0 +1,213 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/actgardner/gogen-avro/v10 v10.1.0/go.mod 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len(os.Args) != 2 { + fmt.Fprintf(os.Stderr, "Usage: %s <config-file-path>\n", + os.Args[0]) + os.Exit(1) + } + + configFile := os.Args[1] + conf := util.ReadConfig(configFile) + + topic := "purchases" + p, err := kafka.NewProducer(&conf) + if err != nil { + fmt.Printf("Failed to create producer: %s", err) + os.Exit(1) + } + + // Go-routine to handle message delivery reports and + // possibly other event types (errors, stats, etc) + go func() { + for e := range p.Events() { + switch ev := e.(type) { + case *kafka.Message: + if ev.TopicPartition.Error != nil { + fmt.Printf("Failed to deliver message: %v\n", ev.TopicPartition) + } else { + fmt.Printf("Produced event to topic %s: key = %-10s value = %s\n", + *ev.TopicPartition.Topic, string(ev.Key), string(ev.Value)) + } + } + } + }() + + users := [...]string{"eabara", "jsmith", "sgarcia", "jbernard", "htanaka", "awalther"} + items := [...]string{"book", "alarm clock", "t-shirts", "gift card", "batteries"} + + for n := 0; n < 10; n++ { + key := users[rand.Intn(len(users))] + data := items[rand.Intn(len(items))] + err := p.Produce(&kafka.Message{ + TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny}, + Key: []byte(key), + Value: []byte(data), + }, nil) + if err != nil { + log.Fatalln(err) + } + } + + // Wait for all messages to be delivered + p.Flush(15 * 1000) + p.Close() +} diff --git a/go/util/util.go b/go/util/util.go new file mode 100644 index 0000000..d56f662 --- /dev/null +++ b/go/util/util.go @@ -0,0 +1,41 @@ +package util + +import ( + "bufio" + "fmt" + "os" + "strings" + + "github.com/confluentinc/confluent-kafka-go/v2/kafka" +) + +func ReadConfig(configFile string) kafka.ConfigMap { + m := make(map[string]kafka.ConfigValue) + + file, err := os.Open(configFile) + if err != nil { + fmt.Fprintf(os.Stderr, "Failed to open file: %s", err) + os.Exit(1) + } + defer file.Close() + + scanner := bufio.NewScanner(file) + for scanner.Scan() { + line := strings.TrimSpace(scanner.Text()) + if !strings.HasPrefix(line, "#") && len(line) != 0 { + before, after, found := strings.Cut(line, "=") + if found { + parameter := strings.TrimSpace(before) + value := strings.TrimSpace(after) + m[parameter] = value + } + } + } + + if err := scanner.Err(); err != nil { + fmt.Printf("Failed to read file: %s", err) + os.Exit(1) + } + + return m +} |