diff --git a/CONFIG.md b/CONFIG.md index 848448a0..e228241a 100644 --- a/CONFIG.md +++ b/CONFIG.md @@ -200,6 +200,37 @@ input: This configuration example may be found in the examples directory [here](example/config_logstash_http_input_ipv6.yml). +### Kafka Input Type + +The `grok_exporter` is also capable of consuming log entries from Kafka. Currently, only plain-text encoded messages are supported. + +```yaml +input: + type: kafka + # Version corresponding to the kafka cluster + kafka_version: 2.1.0 + + # The list of the Kafka brokers part of the Kafka cluster. Please note that you need an instance of grok_exporter per Kafka cluster if you plan on consuming from topics from multiple clusters. + kafka_brokers: + - localhost:9092 + + # The list of Kafka topics to consume from. + kafka_topics: + - grok_exporter_test + + # The assignor to use, which can be either range, roundrobin, sticky (range by default) + kafka_partition_assignor: range + + # The name of the consumer group to register as on the broker. If not specified, the default is 'grok_exporter' + kafka_consumer_group_name: grok_exporter + + # Indicates if the exporter should start consuming as of the most recent messages in the topic (true), or consume from the earliest messages in the topic (false). + kafka_consume_from_oldest: false +``` + +This configuration example may be found in the examples directory [here](example/config-kafka.yml). + + imports Section --------------- diff --git a/KAFKA_TESTING.md b/KAFKA_TESTING.md new file mode 100644 index 00000000..01767959 --- /dev/null +++ b/KAFKA_TESTING.md @@ -0,0 +1,56 @@ +## How to test the Kafka integration + +1. Ensure you have docker setup on your system. + +2. Create the following config and save it as `docker-compose-kafka-single.yml` +``` +--- +version: '2' + +services: + zookeeper: + image: confluentinc/cp-zookeeper:latest + hostname: zookeeper + ports: + - 32181:32181 + environment: + ZOOKEEPER_CLIENT_PORT: 32181 + ZOOKEEPER_TICK_TIME: 2000 + extra_hosts: + - "moby:127.0.0.1" + - "localhost: 127.0.0.1" + + kafka: + image: confluentinc/cp-kafka:latest + hostname: kafka + ports: + - 9092:9092 + depends_on: + - zookeeper + environment: + KAFKA_BROKER_ID: 1 + KAFKA_ZOOKEEPER_CONNECT: zookeeper:32181 + KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092 + KAFKA_AUTO_CREATE_TOPICS_ENABLE: "true" + KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1 + extra_hosts: + - "moby:127.0.0.1" + - "localhost: 127.0.0.1" +``` + +3. Create the kafka cluster: +``` +docker-compose -f docker-compose-kafka-single.yml up +``` + +4. Create the necessary topic: +``` +docker-compose -f docker-compose-kafka-single.yml exec kafka kafka-topics --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic grok_exporter_test +``` + +5. Publish a sample test message: +``` +docker-compose -f docker-compose-kafka-single.yml exec bash -c "echo 'this is a test' | kafka-console-producer --request-required-acks 1 --broker-list localhost:9092 --topic grok_exporter_test" + ``` + +6. Given that the grok_exporter was properly configured and you're matching for a string in the message you've previously published to kafka, you should have matches that appear on the metrics page. \ No newline at end of file diff --git a/config/v3/configV3.go b/config/v3/configV3.go index 5e0b5bf4..34833b9d 100644 --- a/config/v3/configV3.go +++ b/config/v3/configV3.go @@ -16,14 +16,16 @@ package v3 import ( "fmt" - v2 "github.com/fstab/grok_exporter/config/v2" - "github.com/fstab/grok_exporter/tailer/glob" - "github.com/fstab/grok_exporter/template" - "gopkg.in/yaml.v2" "os" + "regexp" "strconv" "strings" "time" + + v2 "github.com/fstab/grok_exporter/config/v2" + "github.com/fstab/grok_exporter/tailer/glob" + "github.com/fstab/grok_exporter/template" + "gopkg.in/yaml.v2" ) const ( @@ -31,6 +33,7 @@ const ( inputTypeStdin = "stdin" inputTypeFile = "file" inputTypeWebhook = "webhook" + inputTypeKafka = "kafka" importMetricsType = "metrics" importPatternsType = "grok_patterns" ) @@ -102,6 +105,12 @@ type InputConfig struct { WebhookFormat string `yaml:"webhook_format,omitempty"` WebhookJsonSelector string `yaml:"webhook_json_selector,omitempty"` WebhookTextBulkSeparator string `yaml:"webhook_text_bulk_separator,omitempty"` + KafkaVersion string `yaml:"kafka_version,omitempty"` + KafkaBrokers []string `yaml:"kafka_brokers,omitempty"` + KafkaTopics []string `yaml:"kafka_topics,omitempty"` + KafkaPartitionAssignor string `yaml:"kafka_partition_assignor,omitempty"` + KafkaConsumerGroupName string `yaml:"kafka_consumer_group_name,omitempty"` + KafkaConsumeFromOldest bool `yaml:"kafka_consume_from_oldest,omitempty"` } type GrokPatternsConfig []string @@ -268,6 +277,19 @@ func (c *InputConfig) addDefaults() { c.WebhookTextBulkSeparator = "\n\n" } } + if c.Type == inputTypeKafka { + c.KafkaConsumeFromOldest = false + + if c.KafkaPartitionAssignor == "" { + c.KafkaPartitionAssignor = "range" + } + if c.KafkaVersion == "" { + c.KafkaVersion = "2.1.0" + } + if c.KafkaConsumerGroupName == "" { + c.KafkaConsumerGroupName = "grok_exporter" + } + } } func (c *GrokPatternsConfig) addDefaults() {} @@ -403,6 +425,26 @@ func (c *InputConfig) validate() error { if c.WebhookFormat == "text_bulk" && c.WebhookTextBulkSeparator == "" { return fmt.Errorf("invalid input configuration: 'input.webhook_text_bulk_separator' is required for input type \"webhook\" and webhook_format \"text_bulk\"") } + case c.Type == inputTypeKafka: + if len(c.KafkaBrokers) == 0 { + return fmt.Errorf("invalid input configuration: Kafka 'input.kafka_brokers' cannot be empty") + } + if len(c.KafkaTopics) == 0 { + return fmt.Errorf("invalid input configuration: Kafka 'input.kafka_topics' cannot be empty") + } + + matched, _ := regexp.MatchString(`^[0-9]\.[0-9]\.[0-9]$`, c.KafkaVersion) + if !matched { + return fmt.Errorf("invalid input configuration: Kafka 'input.kafka_version' must a valid semantic version X.Y.Z") + } + + versionParts := strings.Split(c.KafkaVersion, ".") + vMajor, vMajorErr := strconv.Atoi(versionParts[0]) + vMinor, vMinorErr := strconv.Atoi(versionParts[1]) + if vMajorErr != nil && vMinorErr != nil && vMajor < 1 && vMinor < 8 { + return fmt.Errorf("invalid input configuration: Kafka 'input.kafka_version' must be >= 0.8.0") + } + default: return fmt.Errorf("unsupported 'input.type': %v", c.Type) } diff --git a/example/config-kafka.yml b/example/config-kafka.yml new file mode 100644 index 00000000..f385fa71 --- /dev/null +++ b/example/config-kafka.yml @@ -0,0 +1,25 @@ +global: + config_version: 3 +input: + type: kafka + kafka_version: 2.1.0 + kafka_brokers: + - localhost:9092 + kafka_topics: + - grok_exporter_test + kafka_consumer_group_name: grok_exporter + kafka_consume_from_oldest: true +imports: + - type: grok_patterns + dir: ./logstash-patterns-core/patterns +metrics: + - type: counter + name: test_strings + help: Test string detected. + match: 'test' + labels: + logfile: '{{base .logfile}}' +server: + protocol: http + port: 9144 + diff --git a/exporter/grok.go b/exporter/grok.go index 2c6dbd4e..0c4309fa 100644 --- a/exporter/grok.go +++ b/exporter/grok.go @@ -66,8 +66,11 @@ func verifyFieldName(metricName string, template template.Template, regex *onigu return fmt.Errorf("%v: field name %v is ambigous, as this field is defined in the grok pattern but is also a global field provided by grok_exporter for the %v", metricName, grokFieldName, description) } } else { - if !regex.HasCaptureGroup(grokFieldName) { + numGroups := regex.NumberOfCaptureGroups(grokFieldName) + if numGroups == 0 { return fmt.Errorf("%v: grok field %v not found in match pattern", metricName, grokFieldName) + } else if numGroups > 1 { + return fmt.Errorf("%v: grok field %v found %d times in match pattern: this is ambiguous, the pattern should define each grok field exactly once", metricName, grokFieldName, numGroups) } } } diff --git a/go.mod b/go.mod index cc82c5d9..20a473f5 100644 --- a/go.mod +++ b/go.mod @@ -1,13 +1,18 @@ module github.com/fstab/grok_exporter require ( + github.com/Shopify/sarama v1.27.0 github.com/bitly/go-simplejson v0.5.0 github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect + github.com/ofabry/go-callvis v0.6.1 // indirect github.com/prometheus/client_golang v1.7.1 github.com/prometheus/client_model v0.2.0 github.com/prometheus/common v0.10.0 github.com/sirupsen/logrus v1.6.0 golang.org/x/exp v0.0.0-20191227195350-da58074b4299 + golang.org/x/image v0.0.0-20200801110659-972c09e46d76 // indirect + golang.org/x/tools v0.0.0-20200828161849-5deb26317202 // indirect + golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect gopkg.in/yaml.v2 v2.3.0 ) diff --git a/go.sum b/go.sum index 4a44d303..777b56c8 100644 --- a/go.sum +++ b/go.sum @@ -1,5 +1,8 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= +github.com/Shopify/sarama v1.27.0 h1:tqo2zmyzPf1+gwTTwhI6W+EXDw4PVSczynpHKFtVAmo= +github.com/Shopify/sarama v1.27.0/go.mod h1:aCdj6ymI8uyPEux1JJ9gcaDT6cinjGhNCAhs54taSUo= +github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI= github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM= github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= @@ -16,16 +19,32 @@ github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4Yn github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4= github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY= github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/corona10/goimagehash v1.0.2/go.mod h1:/l9umBhvcHQXVtQO1V6Gp1yD20STawkhRnnX0D1bvVI= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/eapache/go-resiliency v1.2.0 h1:v7g92e/KSN71Rq7vSThKaWIq68fL4YHvWyiUKorFR1Q= +github.com/eapache/go-resiliency v1.2.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs= +github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 h1:YEetp8/yCZMuEPMUDHG0CW/brkkEp8mzqk2+ODEitlw= +github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU= +github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc= +github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I= +github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8= +github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k= +github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g= +github.com/frankban/quicktest v1.10.0/go.mod h1:ui7WezCLWMWxVWr1GETZY3smRy0G4KWq9vcPtJmFl7Y= github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE= github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk= github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= +github.com/goccy/go-graphviz v0.0.6 h1:sCT69fmH2KKsObVfsozYyKXxrqmIfo3SyHZs72xkgxs= +github.com/goccy/go-graphviz v0.0.6/go.mod h1:wXVsXxmyMQU6TN3zGRttjNn3h+iCAS7xQFC6TlNvLhk= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= +github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g= +github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k= github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= @@ -36,23 +55,35 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0= 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h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro= +github.com/jcmturner/gofork v1.0.0 h1:J7uCkflzTEhUZ64xqKnkDxq3kzc96ajM1Gli5ktUem8= +github.com/jcmturner/gofork v1.0.0/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/UM3ncEo0o= +github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI= github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU= github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w= +github.com/klauspost/compress v1.10.10 h1:a/y8CglcM7gLGYmlbP/stPE5sR3hbhFRUjCBfd/0B3I= +github.com/klauspost/compress v1.10.10/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs= github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ= github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8= 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-79,6 +120,8 @@ github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA= github.com/prometheus/procfs v0.1.3 h1:F0+tqvhOksq22sc6iCHF5WGlWjdwj92p0udFh1VFBS8= github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU= +github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0 h1:MkV+77GLUNo5oJ0jf870itWm3D0Sjh7+Za9gazKc5LQ= +github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4= github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo= github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE= github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I= @@ -89,24 +132,47 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf github.com/stretchr/testify 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h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE= +golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8= google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0= google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM= @@ -133,9 +210,21 @@ gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLks gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo= gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/jcmturner/aescts.v1 v1.0.1 h1:cVVZBK2b1zY26haWB4vbBiZrfFQnfbTVrE3xZq6hrEw= +gopkg.in/jcmturner/aescts.v1 v1.0.1/go.mod h1:nsR8qBOg+OucoIW+WMhB3GspUQXq9XorLnQb9XtvcOo= +gopkg.in/jcmturner/dnsutils.v1 v1.0.1 h1:cIuC1OLRGZrld+16ZJvvZxVJeKPsvd5eUIvxfoN5hSM= +gopkg.in/jcmturner/dnsutils.v1 v1.0.1/go.mod h1:m3v+5svpVOhtFAP/wSz+yzh4Mc0Fg7eRhxkJMWSIz9Q= +gopkg.in/jcmturner/goidentity.v3 v3.0.0/go.mod h1:oG2kH0IvSYNIu80dVAyu/yoefjq1mNfM5bm88whjWx4= +gopkg.in/jcmturner/gokrb5.v7 v7.5.0 h1:a9tsXlIDD9SKxotJMK3niV7rPZAJeX2aD/0yg3qlIrg= +gopkg.in/jcmturner/gokrb5.v7 v7.5.0/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM= +gopkg.in/jcmturner/rpc.v1 v1.1.0 h1:QHIUxTX1ISuAv9dD2wJ9HWQVuWDX/Zc0PfeC2tjc4rU= +gopkg.in/jcmturner/rpc.v1 v1.1.0/go.mod h1:YIdkC4XfD6GXbzje11McwsDuOlZQSb9W4vfLvuNnlv8= gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU= gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.0-20200601152816-913338de1bd2/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/grok_exporter.go b/grok_exporter.go index c42b87e1..fcc57559 100644 --- a/grok_exporter.go +++ b/grok_exporter.go @@ -17,6 +17,10 @@ package main import ( "flag" "fmt" + "os" + "strings" + "time" + "github.com/fstab/grok_exporter/config" "github.com/fstab/grok_exporter/config/v3" "github.com/fstab/grok_exporter/exporter" @@ -26,9 +30,6 @@ import ( "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus/promhttp" "github.com/sirupsen/logrus" - "os" - "strings" - "time" ) var ( @@ -352,6 +353,8 @@ func startTailer(cfg *v3.Config, registry prometheus.Registerer) (fswatcher.File tail = tailer.RunStdinTailer() case cfg.Input.Type == "webhook": tail = tailer.InitWebhookTailer(&cfg.Input) + case cfg.Input.Type == "kafka": + tail = tailer.RunKafkaTailer(&cfg.Input) default: return nil, fmt.Errorf("Config error: Input type '%v' unknown.", cfg.Input.Type) } diff --git a/oniguruma/oniguruma.go b/oniguruma/oniguruma.go index cca71a50..13048b22 100644 --- a/oniguruma/oniguruma.go +++ b/oniguruma/oniguruma.go @@ -83,8 +83,15 @@ func (regex *Regex) Free() { } func (regex *Regex) HasCaptureGroup(name string) bool { - _, err := regex.getCaptureGroupNums(name) - return err == nil + return regex.NumberOfCaptureGroups(name) > 0 +} + +func (regex *Regex) NumberOfCaptureGroups(name string) int { + groups, err := regex.getCaptureGroupNums(name) + if err != nil { + return 0 + } + return len(groups) } func (r *Regex) getCaptureGroupNums(name string) ([]C.int, error) { diff --git a/tailer/kafkaTailer.go b/tailer/kafkaTailer.go new file mode 100644 index 00000000..67b732bf --- /dev/null +++ b/tailer/kafkaTailer.go @@ -0,0 +1,160 @@ +package tailer + +import ( + ctx "context" + "sync" + + "github.com/Shopify/sarama" + configuration "github.com/fstab/grok_exporter/config/v3" + "github.com/fstab/grok_exporter/tailer/fswatcher" + "github.com/sirupsen/logrus" +) + +type KafkaTailer struct { + lines chan *fswatcher.Line + errors chan fswatcher.Error +} + +type consumer struct { + ready chan bool + lineChan chan *fswatcher.Line + errorChan chan fswatcher.Error +} + +func (t KafkaTailer) Lines() chan *fswatcher.Line { + return t.lines +} + +func (t KafkaTailer) Errors() chan fswatcher.Error { + return t.errors +} + +func (t KafkaTailer) Close() { + logrus.Info("Close method called") + +} + +// RunKafkaTailer runs the kafka tailer +func RunKafkaTailer(cfg *configuration.InputConfig) fswatcher.FileTailer { + lineChan := make(chan *fswatcher.Line) + errorChan := make(chan fswatcher.Error) + + tailer := &KafkaTailer{ + lines: lineChan, + errors: errorChan, + } + + go initKafkaConsumer(lineChan, errorChan, cfg) + + return *tailer +} + +func initKafkaConsumer(lineChan chan *fswatcher.Line, errorChan chan fswatcher.Error, cfg *configuration.InputConfig) { + + version, err := sarama.ParseKafkaVersion(cfg.KafkaVersion) + if err != nil { + logrus.Panicf("[Kafka] Error parsing Kafka version: %v", err) + } + + /** + * Construct a new Sarama configuration. + * The Kafka cluster version has to be defined before the consumer/producer is initialized. + */ + + consumer := consumer{ + ready: make(chan bool), + lineChan: lineChan, + errorChan: errorChan, + } + + kafkaConfig := sarama.NewConfig() + kafkaConfig.Version = version + + switch cfg.KafkaPartitionAssignor { + case "sticky": + kafkaConfig.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategySticky + case "roundrobin": + kafkaConfig.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRoundRobin + case "range": + kafkaConfig.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRange + default: + consumer.errorChan <- fswatcher.NewError(fswatcher.NotSpecified, err, "[Kafka] Unrecognized consumer group partition assignor!") + } + + if cfg.KafkaConsumeFromOldest { + kafkaConfig.Consumer.Offsets.Initial = sarama.OffsetOldest + } + + /** + * Setup a new Sarama consumer group + */ + + ctx, cancel := ctx.WithCancel(ctx.Background()) + client, err := sarama.NewConsumerGroup(cfg.KafkaBrokers, cfg.KafkaConsumerGroupName, kafkaConfig) + if err != nil { + consumer.errorChan <- fswatcher.NewError(fswatcher.NotSpecified, err, "[Kafka] Error creating client") + } + + wg := &sync.WaitGroup{} + wg.Add(1) + go func() { + defer wg.Done() + for { + // `Consume` should be called inside an infinite loop, when a + // server-side rebalance happens, the consumer session will need to be + // recreated to get the new claims + if err := client.Consume(ctx, cfg.KafkaTopics, &consumer); err != nil { + consumer.errorChan <- fswatcher.NewError(fswatcher.NotSpecified, err, "[Kafka] Error from consumer") + } + // check if context was cancelled, signaling that the consumer should stop + if ctx.Err() != nil { + logrus.Infof("[Kafka] Consumer %s goroutine exiting.", cfg.KafkaConsumerGroupName) + return + } + consumer.ready = make(chan bool) + } + }() + + <-consumer.ready // Await till the consumer has been set up + logrus.Infof("[Kafka] Consumer %s active.", cfg.KafkaConsumerGroupName) + + select { + case <-ctx.Done(): + logrus.Info("[Kafka] Consumer terminating: context cancelled") + } + + cancel() + wg.Wait() + + if err = client.Close(); err != nil { + consumer.errorChan <- fswatcher.NewError(fswatcher.NotSpecified, err, "[Kafka] Error closing client") + return + } + + logrus.Info("[Kafka] Client has been closed") + +} + +// Setup is run at the beginning of a new session, before ConsumeClaim +func (consumer *consumer) Setup(sarama.ConsumerGroupSession) error { + // Mark the consumer as ready + close(consumer.ready) + return nil +} + +// Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited +func (consumer *consumer) Cleanup(sarama.ConsumerGroupSession) error { + return nil +} + +// ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages(). +func (consumer *consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error { + + for message := range claim.Messages() { + logrus.Debugf("[Kafka] Message content: %s", string(message.Value)) + session.MarkMessage(message, "") + consumer.lineChan <- &fswatcher.Line{Line: string(message.Value)} + } + + return nil +}