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camundala.worker.Handler.scala Maven / Gradle / Ivy
package camundala
package worker
import camundala.domain.*
import camundala.bpmn.*
import camundala.worker.CamundalaWorkerError.*
import io.circe
import sttp.model.Uri.QuerySegment
import sttp.model.{Method, Uri}
/** handler for Custom Validation (next to the automatic Validation of the In Object.
*
* For example if one of two optional variables must exist.
*
* Usage:
* ```
* .withValidation(
* ValidationHandler(
* (in: In) => Right(in)
* )
* )
* ```
* or (with implicit conversion)
* ```
* .withValidation(
* (in: In) => Right(in)
* )
* ```
* Default is no extra Validation.
*/
trait ValidationHandler[In <: Product: circe.Codec]:
def validate(in: In): Either[ValidatorError, In]
end ValidationHandler
object ValidationHandler:
def apply[
In <: Product: InOutCodec
](funct: In => Either[ValidatorError, In]): ValidationHandler[In] =
new ValidationHandler[In]:
override def validate(in: In): Either[ValidatorError, In] =
funct(in)
end ValidationHandler
/** handler for Custom Process Initialisation. All the variables in the Result Map will be put on
* the process.
*
* For example if you want to init process Variables to a certain value.
*
* Usage:
* ```
* .withValidation(
* InitProcessHandler(
* (in: In) => {
* Right(
* Map("isCompany" -> true)
* ) // success
* }
* )
* )
* ```
* or (with implicit conversion)
* ```
* .withValidation(
* (in: In) => {
* Right(
* Map("isCompany" -> true)
* ) // success
* }
* )
* ```
* Default is no Initialization.
*/
trait InitProcessHandler[
In <: Product: InOutCodec
]:
def init(input: In): Either[InitProcessError, Map[String, Any]]
end InitProcessHandler
object InitProcessHandler:
def apply[
In <: Product: InOutCodec
](
funct: In => Either[InitProcessError, Map[String, Any]],
processLabels: ProcessLabels
): InitProcessHandler[In] =
new InitProcessHandler[In]:
override def init(in: In): Either[InitProcessError, Map[String, Any]] =
funct(in)
.map:
_ ++ processLabels.toMap
end InitProcessHandler
trait RunWorkHandler[
In <: Product: InOutCodec,
Out <: Product: InOutCodec
]:
type RunnerOutput =
EngineRunContext ?=> Either[RunWorkError, Out]
def runWork(inputObject: In): RunnerOutput
end RunWorkHandler
case class ServiceHandler[
In <: Product: InOutCodec,
Out <: Product: InOutCodec,
ServiceIn: InOutEncoder,
ServiceOut: InOutDecoder
](
httpMethod: Method,
apiUri: In => Uri,
querySegments: In => Seq[QuerySegmentOrParam],
inputMapper: In => Option[ServiceIn],
inputHeaders: In => Map[String, String],
outputMapper: (ServiceResponse[ServiceOut], In) => Either[ServiceMappingError, Out],
defaultServiceOutMock: MockedServiceResponse[ServiceOut],
serviceInExample: ServiceIn
) extends RunWorkHandler[In, Out]:
def runWork(
inputObject: In
): RunnerOutput =
val rRequest = runnableRequest(inputObject)
for
optWithServiceMock <- withServiceMock(rRequest, inputObject)
output <- handleMocking(optWithServiceMock, rRequest).getOrElse(
summon[EngineRunContext]
.sendRequest[ServiceIn, ServiceOut](rRequest)
.flatMap(out => outputMapper(out, inputObject))
)
yield output
end for
end runWork
private def runnableRequest(
inputObject: In
): RunnableRequest[ServiceIn] =
RunnableRequest(
inputObject,
httpMethod,
apiUri(inputObject),
querySegments(inputObject),
inputMapper(inputObject),
inputHeaders(inputObject)
)
private def withServiceMock(
runnableRequest: RunnableRequest[ServiceIn],
in: In
)(using context: EngineRunContext): Either[ServiceError, Option[Out]] =
(
context.generalVariables.servicesMocked,
context.generalVariables.outputServiceMock
) match
case (_, Some(json)) =>
(for
mockedResponse <- decodeMock[MockedServiceResponse[ServiceOut]](json)
out <- handleServiceMock(mockedResponse, runnableRequest, in)
yield out)
.map(Some.apply)
case (true, _) =>
handleServiceMock(defaultServiceOutMock, runnableRequest, in)
.map(Some.apply)
case _ =>
Right(None)
end withServiceMock
private def decodeMock[Out: InOutDecoder](
json: Json
): Either[ServiceMockingError, Out] =
decodeTo[Out](json.asJson.deepDropNullValues.toString).left
.map(ex => ServiceMockingError(errorMsg = ex.causeMsg))
end decodeMock
private def handleMocking(
optOutMock: Option[Out],
runnableRequest: RunnableRequest[ServiceIn]
)(using context: EngineRunContext): Option[Either[ServiceError, Out]] =
optOutMock
.map { mock =>
context
.getLogger(getClass)
.info(s"""Mocked Service: ${niceClassName(this.getClass)}
|${requestMsg(runnableRequest)}
| - mockedResponse: ${mock.asJson.deepDropNullValues}
|""".stripMargin)
mock
}
.map(m => Right(m))
end handleMocking
private def handleServiceMock(
mockedResponse: MockedServiceResponse[ServiceOut],
runnableRequest: RunnableRequest[ServiceIn],
in: In
): Either[ServiceError, Out] =
mockedResponse match
case MockedServiceResponse(_, Right(body), headers) =>
mapBodyOutput(body, headers, in)
case MockedServiceResponse(status, Left(body), _) =>
Left(
ServiceRequestError(
status,
serviceErrorMsg(
status,
s"Mocked Error: ${body.map(_.asJson.deepDropNullValues).getOrElse("-")}",
runnableRequest
)
)
)
def mapBodyOutput(
serviceOutput: ServiceOut,
headers: Seq[Seq[String]],
in: In
) =
outputMapper(
ServiceResponse(
serviceOutput,
// take correct ones and make a map of it
headers
.map(_.toList)
.collect { case key :: value :: _ => key -> value }
.toMap
),
in
)
end ServiceHandler
trait CustomHandler[
In <: Product: InOutCodec,
Out <: Product: InOutCodec
] extends RunWorkHandler[In, Out]:
end CustomHandler
object CustomHandler:
def apply[
In <: Product: InOutCodec,
Out <: Product: InOutCodec
](funct: In => Either[CustomError, Out]): CustomHandler[In, Out] =
new CustomHandler[In, Out]:
override def runWork(inputObject: In): RunnerOutput =
funct(inputObject)
end CustomHandler
