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CDA-490 backend to Kafka
Signed-off-by: Alexander Diemand <codieplusplus@apax.net>
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‎cabal.project

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plugins/backend-editor
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plugins/backend-ekg
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plugins/backend-graylog
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--plugins/backend-kafka
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plugins/backend-monitoring
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plugins/backend-trace-acceptor
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plugins/backend-trace-forwarder

‎examples/complex/Main.lhs

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#define RUN_ProcBufferDump
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#define RUN_ProcCounterOutput
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-- if defined loads the Kafka plugin and outputs metrics to topic 'test'
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#undef OUT_KafkaStream
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module Main
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( main )
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where
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import Cardano.BM.Backend.Aggregation
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--import Cardano.BM.Backend.Editor
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import Cardano.BM.Backend.EKGView
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#if defined(OUT_KafkaStream)
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import Cardano.BM.Backend.Kafka
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#endif
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import Cardano.BM.Backend.Monitoring
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import Cardano.BM.Backend.Switchboard (Switchboard, readLogBuffer)
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import Cardano.BM.Backend.TraceForwarder
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CM.setBackends c "complex.#aggregation.complex.monitoring" (Just [MonitoringBK])
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CM.setBackends c "complex.#aggregation.complex.observeIO" (Just [EKGViewBK])
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#if defined(OUT_KafkaStream)
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CM.setBackends c "complex.counters" (Just [KatipBK, UserDefinedBK "KafkaStream" ])
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#endif
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CM.setScribes c "complex.counters" (Just ["StdoutSK::stdout","FileSK::logs/out.json"])
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CM.setEKGBindAddr c $ Just (Endpoint ("localhost", 12790))
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CM.setTextOption c "forwarderMinSeverity" "Warning" -- sets min severity filter in forwarder
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CM.setTextOption c "prometheusOutput" "json" -- Prometheus' output in JSON-format
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#if defined(OUT_KafkaStream)
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CM.setTextOption c "kafka_servers" "192.168.11.42:9092,localhost:9092" -- Kafka servers to try
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CM.setTextOption c "kafka_topic" "test" -- output to Kafka topic 'test'
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#endif
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CM.setForwardDelay c (Just 1000)
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CM.setMonitors c $ HM.fromList
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>>= loadPlugin sb
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Cardano.BM.Backend.Monitoring.plugin c tr sb
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>>= loadPlugin sb
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#if defined(OUT_KafkaStream)
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Cardano.BM.Backend.Kafka.plugin c tr sb
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>>= loadPlugin sb
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#endif
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#ifdef LINUX
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-- inspect logs with 'journalctl -t example-complex'
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Cardano.BM.Scribe.Systemd.plugin c tr sb "example-complex"

‎examples/lobemo-examples.cabal

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lobemo-backend-aggregation,
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--lobemo-backend-editor,
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lobemo-backend-ekg,
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--lobemo-backend-kafka,
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lobemo-backend-monitoring,
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lobemo-backend-trace-forwarder,
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lobemo-scribe-systemd,

‎plugins/backend-kafka/LICENSE

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‎plugins/backend-kafka/NOTICE

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Copyright 2021 IOHK
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Licensed under the Apache License, Version 2.0 (the "License”). You may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.txt
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

‎plugins/backend-kafka/README.md

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# Kafka backend
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This backend can be loaded as a plugin and then log items can be directed to a Kafka topic.
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## Configuration options
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* "kafka_servers" - this is a string of a server name or IP address with port number separated by a ':'. Multiple servers can be indicated with separated names by ','.
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* "kafka_topic" - the name of the topic to which log items shall be sent to. Currently, only a single topic is supported.
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(place these key-value pairs in the configuration section "options")
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## Example
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the [example-complex](examples/complex/Main.lhs) is extended with sending out metrics to a Kafka topic.
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## References
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- using Haskell bindings to librdkafka: https://hackage.haskell.org/package/hw-kafka-client
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- learn more about [Kafka](https://kafka.apache.org/)

‎plugins/backend-kafka/Setup.hs

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import Distribution.Simple
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main = defaultMain

‎plugins/backend-kafka/lobemo-backend-kafka.cabal

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cabal-version: 2.0
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name: lobemo-backend-kafka
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version: 0.1.0.0
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synopsis: provides a backend implementation to Kafka
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homepage: https://github.com/input-output-hk/iohk-monitoring-framework
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license: Apache-2.0
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license-files: LICENSE, NOTICE
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author: Alexander Diemand
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maintainer: operations@iohk.io
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copyright: 2021 IOHK
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category: Benchmarking
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build-type: Simple
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extra-source-files: README.md
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library
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exposed-modules: Cardano.BM.Backend.Kafka
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default-extensions: OverloadedStrings
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build-depends: base >=4.11,
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iohk-monitoring,
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aeson,
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async,
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bytestring,
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hw-kafka-client,
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safe-exceptions,
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stm,
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text
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hs-source-dirs: src
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default-language: Haskell2010

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