SkyWalking Plugins for Scala

SkyWalking Scala is a SkyWalking Agent Plugins for Scala, especially for the ZIO ecosystem.

Still in the experimental stage, there may be some minor issues related to work steal, especially for ZIO and Cats-Effect.

Environment

• Java 11
• Scala 3.3.0
• SkyWalking 9.1.0

Example

Available plugins

plugin	maybe support version	tested version
cats-effect-v3x-plugin	3.4.x	3.4.1
zio-v2x-plugin	2.0.x	2.0.9,2.0.13,2.0.15
ziogrpc-v06rcx-plugin	0.6.0-test6 ~ 0.6.0-RC5	0.6.0-RC5
ziohttp-v2x-plugin	2.0.0-RC2 ~ 2.0.0-RC11	2.0.0-RC10
caliban-v2x-plugin	2.0.0 ~ 2.0.2	2.0.1
executors-plugin	-	-
ziocache-plugin	Blocking by byte-buddy issue	Blocking by byte-buddy issue

Other small versions of the library supported by this plugin may also work, but they have not been tested.

These plugins can be used together with the following plugins, tested by me:

• apm-hikaricp-3.x-4.x-plugin-*.jar
• apm-jackson-2.x-plugin-*.jar
• apm-jdbc-commons-*.jar
• apm-jdk-forkjoinpool-plugin-*.jar
• apm-jdk-threading-plugin-*.jar
• apm-lettuce-5.x-plugin-*.jar
• apm-mysql-8.x-plugin-*.jar
• apm-mysql-commons-*.jar
• apm-postgresql-8.x-plugin-*.jar
• apm-pulsar-2.8.x-plugin-*.jar
• apm-pulsar-common-*.jar
• and so on ...

NOTE: apm-ziogrpc-v06rcx-plugin-*.jar should never be used together with apm-grpc-1.x-plugin-*.jar.

How to start

1. Clone code: git clone https://github.com/bitlap/skywalking-scala.git.
2. Enter the source file directory: cd skywalking-scala.
3. Build plugins: sh scenarios/packageJars.sh.
4. Copy the scenarios/skywalking-agent/plugins/*.jar to skywalking plugins folder. (Copy on demand)

Please check the official documents for specific information skywalking.apache.org/docs

To use the plugin quickly, you can download it from Release Assets

Scenarios

It needs docker & docker-compose

1. Run two services hello-server and hello-client: sh scenarios/runExamplesOnDocker.sh
2. Send a request: curl http://localhost:8090/hello
3. Open in browser: http://localhost:8080/general

More information

How to realize it

plugin	library	Enhance Targets
cats-effect-v3x-plugin	cats-effect	cats.effect.IOFiber
zio-v2x-plugin	zio	zio.internal.FiberRuntime, zio.Executor
ziogrpc-v06rcx-plugin	zio-grpc	scalapb.zio_grpc.ZChannel io.grpc.ServerCall scalapb.zio_grpc.server.ZServerCallHandler
ziohttp-v2x-plugin	zio-http	zhttp.http.Http$PartialCollectHttp$
caliban-v2x-plugin	caliban	caliban.GraphQLInterpreter, caliban.wrappers.Wrapper
executors-plugin	java.util.concurrent.ThreadPoolExecutor and its subclasses	submit, schedule, execute
ziocache-plugin	zio-cache	zio.cache.Cache

Available configurations

key	description
plugin.ziov2.ignore_fiber_regexes	Ignore ZIO Fibers by FiberId.location which match this regex, i.e. no span will be created, default is empty. Allow commas to separate multiple.
plugin.calibanv2.url_prefix	Add a custom prefix to the graphql operation, default is Caliban/GraphQL/.
plugin.calibanv2.ignore_url_prefixes	Ignore operation names starting with this prefix, i.e. no span will be created. Allow commas to separate multiple.
plugin.calibanv2.collect_variables	Collect request variables.
plugin.calibanv2.variables_length_threshold	How many characters to keep and send to the OAP backend.
plugin.ziohttpv2.ignore_url_prefixes	Ignore request paths starting with this prefix, i.e. no span will be created. Allow commas to separate multiple.
plugin.ziohttpv2.collect_http_params	Collect http query params.
plugin.ziohttpv2.http_params_length_threshold	How many characters to keep and send to the OAP backend.

The prefix should be added when passing command line parameters, such as: -Dskywalking.plugin.calibanv2.url_prefix=GQL/