Add Apache Kafka consumer/producer (#14)

* Add consumer/producer/airports workload

* fix(circleci): bump executor image

* fix(Makefile): go get -> go install

* Version 3 implementation

* Remove unused Kafka workload

Co-authored-by: Peter Szabo <asdwsda@gmail.com>

.circleci/config.yml

@@ -6,7 +6,7 @@ orbs:
 jobs:
   build:
     docker:
-      - image: circleci/golang:1.16
+      - image: cimg/go:1.18
         environment:
           GOFLAGS: -mod=readonly
     steps:
@@ -33,7 +33,7 @@ jobs:
           name: Save Go module cache
           key: gomod-v1-{{ .Branch }}-{{ checksum "go.sum" }}
           paths:
-            - /go/pkg/mod
+            - /home/circleci/go/pkg/mod
 
       - restore_cache:
           name: Restore license cache

Makefile

@@ -78,7 +78,7 @@ check: test-all lint ## Run tests and linters
 
 bin/go-junit-report:
 	@mkdir -p bin
-	GOBIN=${PWD}/bin/ go get -u github.com/jstemmer/go-junit-report
+	GOBIN=${PWD}/bin/ go install github.com/jstemmer/go-junit-report
 
 TEST_PKGS ?= ./...
 TEST_REPORT_NAME ?= results.xml

README.md

@@ -24,12 +24,61 @@ Simply echos back a set string
 
 Available options:
 
-- EHCO_STR - string to echo back
+- ECHO_STR - string to echo back
+
 
 ### Subsequent requests
 
 Subsequent request URLs can be set using the `REQUESTS` environment variable. Multiple URLs can be set and must be separated by `space`. A `count` must also be set for each URL using the following syntax: `URL#count`.
 
+### Apache Kafka
+
+Allspark can be used as an Apache Kafka consumer or producer.
+A single instance can work as both at the same time.
+
+#### KafkaServer
+The Kafka server is a consumer that triggers `REQUESTS` when a message is consumed from the topic specified with the below option.
+Available options:
+- `KAFKASERVER_BOOTSTRAP_SERVER`
+
+  The kafka bootstrap server where the cluster can be reached.
+  Required.
+
+  e.g.
+  ```yaml
+    name: KAFKASERVER_BOOTSTRAP_SERVER
+    value: "kafka-all-broker.kafka.svc.cluster.local:29092"
+  ```
+- `KAFKASERVER_TOPIC`
+
+  Starts a kafka consumer for the topic passed in as value.
+
+  e.g.
+  ```yaml
+    name: KAFKASERVER_CONSUMER
+    value: "example-topic"
+  ```
+- `KAFKASERVER_CONSUMER_GROUP`
+
+  Sets the consumer group id for the kafka consumer.
+
+  If not set it gets defaulted to `allspark-consumer-group`.
+
+  e.g.
+  ```yaml
+    name: KAFKASERVER_CONSUMER_GROUP
+    value: "example-group"
+  ```
+
+#### Requests
+You can use the `REQUESTS` variable to set additional consumers and producers
+
+e.g.
+```yaml
+  name: REQUESTS
+  value: kafka-consume://kafka-all-broker.kafka:29092/example-topic?consumerGroup=allspark-consumer-group kafka-produce://kafka-all-broker.kafka:29092/example-topic?message=example-message#1
+```
+
 ### Example deployment
 
 ```yaml
@@ -127,3 +176,4 @@ spec:
   selector:
     app: analytics
 ```
+

cmd/allspark/configuration.go

@@ -21,6 +21,7 @@ import (
 	"strings"
 
 	"emperror.dev/errors"
+	"github.com/banzaicloud/allspark/internal/kafka"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
 
@@ -57,6 +58,9 @@ type Config struct {
 
 	// TCP server configuration
 	TCPServer tcpserver.Config `mapstructure:"tcpServer"`
+
+	// Kafka server consumer configurations
+	KafkaServer kafka.Consumer `mapstructure:"kafkaServer"`
 }
 
 // Validate validates the configuration
@@ -91,6 +95,12 @@ func (c Config) Validate() (Config, error) {
 	}
 	c.TCPServer = tcpServerConfig
 
+	kafkaServerConfig, err := c.KafkaServer.Validate()
+	if err != nil {
+		return c, errors.WrapIf(err, "could not validate kafka server config")
+	}
+	c.KafkaServer = *kafkaServerConfig
+
 	return c, nil
 }
 

cmd/allspark/main.go

@@ -21,6 +21,8 @@ import (
 
 	"emperror.dev/emperror"
 	"emperror.dev/errors"
+	"github.com/banzaicloud/allspark/internal/kafka"
+	"github.com/banzaicloud/allspark/internal/kafka/server"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
 	yaml "gopkg.in/yaml.v2"
@@ -113,6 +115,7 @@ func main() {
 		}
 		wl = workload.NewPIWorkload(uint(count), logger)
 	}
+
 	var wg sync.WaitGroup
 
 	// HTTP server
@@ -181,5 +184,28 @@ func main() {
 		srv.Run()
 	}()
 
+	// Kafka server
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		consumer := kafka.NewConsumer(configuration.KafkaServer.BootstrapServer, configuration.KafkaServer.Topic, configuration.KafkaServer.ConsumerGroup, logger)
+		srv := server.New(consumer, logger, errorHandler)
+		if wl != nil {
+			srv.SetWorkload(wl)
+		}
+
+		kafkaRequests, err := request.CreateRequestsFromStringSlice(viper.GetStringSlice("kafkaRequests"), logger.WithField("server", "kafka"))
+		if err != nil {
+			panic(err)
+		}
+		if len(kafkaRequests) == 0 {
+			kafkaRequests = requests
+		}
+
+		srv.SetRequests(kafkaRequests)
+		srv.SetSQLClient(sqlClient)
+		srv.Run()
+	}()
+
 	wg.Wait()
 }

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/jackc/pgx/v4 v4.15.0
 	github.com/pkg/errors v0.9.1
+	github.com/segmentio/kafka-go v0.4.31
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.10.1
@@ -35,13 +36,16 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect
 	github.com/jackc/pgtype v1.10.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/jstemmer/go-junit-report v1.0.0 // indirect
+	github.com/klauspost/compress v1.14.2 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/magiconair/properties v1.8.6 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/mitchellh/mapstructure v1.4.3 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/pierrec/lz4/v4 v4.1.14 // indirect
 	github.com/pingcap/errors v0.11.5-0.20201126102027-b0a155152ca3 // indirect
 	github.com/satori/go.uuid v1.2.0 // indirect
 	github.com/siddontang/go v0.0.0-20180604090527-bdc77568d726 // indirect