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rkorytkowskirkorytkowski
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Implement /convert endpoint for xml/json conversion (#165)
1 parent 0fe78c5 commit 5490b62

9 files changed

Lines changed: 230 additions & 6 deletions

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‎src/commonMain/kotlin/constants/Endpoints.kt‎

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package constants
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const val VALIDATION_ENDPOINT = "validate"
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const val CONVERSION_ENDPOINT = "convert"
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const val VALIDATOR_VERSION_ENDPOINT = "validator/version"
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const val CONTEXT_ENDPOINT = "context"
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const val IG_ENDPOINT = "ig"

‎src/commonMain/resources/static-content/openapi.yml‎

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@@ -61,6 +61,81 @@ paths:
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title: validatorVersionOK
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type: string
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example: "5.6.39"
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/convert:
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post:
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tags:
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- Convert a Resource
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description: "Converts a resource."
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operationId: ConvertAResource
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produces:
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- application/json
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- application/xml
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requestBody:
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required: true
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content:
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application/json:
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schema:
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type: object
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application/xml:
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schema:
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type: object
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parameters:
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- in: query
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name: type
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schema:
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type: string
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description: xml or json
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- in: query
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name: toType
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schema:
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type: string
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description: xml or json
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- in: query
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name: version
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schema:
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type: string
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description: source FHIR version
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- in: query
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name: toVersion
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schema:
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type: string
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description: target FHIR version
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- in: query
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name: sessionId
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schema:
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type: string
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description: sessionId to reuse cached validator
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- in: header
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name: Session-Id
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schema:
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type: string
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format: uuid
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description: sessionId to reuse cached validator
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responses:
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"200":
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description: OK
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headers:
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Session-Id:
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schema:
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type: string
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format: uuid
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description: sessionId to reuse cached validator in consecutive calls
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"400":
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description: Bad Request
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content:
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text/plain:
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schema:
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title: convertBadRequest
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type: string
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example: "Invalid toType parameter! Supported xml or json."
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"500":
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description: Internal Server Error
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content:
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text/plain:
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schema:
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title: convertInternalServerError
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type: string
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example: "Internal server error."
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/ig:
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get:
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tags:

‎src/jvmMain/kotlin/Module.kt‎

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@@ -1,5 +1,6 @@
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import com.fasterxml.jackson.databind.DeserializationFeature
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import com.fasterxml.jackson.databind.SerializationFeature
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import controller.conversion.conversionModule
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import controller.debug.debugModule
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import controller.ig.igModule
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import controller.terminology.terminologyModule
@@ -98,6 +99,7 @@ fun Application.setup() {
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versionModule()
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debugModule()
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validationModule()
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conversionModule()
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terminologyModule()
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uptimeModule()
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‎src/jvmMain/kotlin/controller/ControllersInjection.kt‎

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@@ -1,5 +1,7 @@
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package controller
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import controller.conversion.ConversionController
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import controller.conversion.ConversionControllerImpl
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import controller.ig.IgController
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import controller.ig.IgControllerImpl
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import controller.terminology.TerminologyController
@@ -15,6 +17,7 @@ import org.koin.dsl.module
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object ControllersInjection {
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val koinBeans = module {
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single<ValidationController> { ValidationControllerImpl() }
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single<ConversionController> { ConversionControllerImpl() }
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single<VersionController> { VersionControllerImpl() }
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single<IgController> { IgControllerImpl() }
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single<TerminologyController> { TerminologyControllerImpl() }

‎src/jvmMain/kotlin/controller/conversion/ConversionController.kt‎

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package controller.conversion
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interface ConversionController {
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suspend fun convertRequest(content: String, type: String? = "json", version: String? = "5.0", toType: String? = type,
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toVersion: String? = version, sessionId: String?): ConversionResponse
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}
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data class ConversionResponse(val response: String, val sessionId: String)

‎src/jvmMain/kotlin/controller/conversion/ConversionControllerImpl.kt‎

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package controller.conversion
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import controller.validation.ValidationServiceFactory
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import model.CliContext
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import org.hl7.fhir.utilities.TimeTracker
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import org.hl7.fhir.utilities.VersionUtilities
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import org.hl7.fhir.validation.ValidationEngine
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import org.koin.core.component.KoinComponent
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import org.koin.core.component.inject
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import java.nio.file.Files
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import java.nio.file.Path
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import kotlin.io.path.deleteIfExists
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class ConversionControllerImpl : ConversionController, KoinComponent {
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private val validationServiceFactory by inject<ValidationServiceFactory>()
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override suspend fun convertRequest(content: String, type: String?, version: String?, toType: String?,
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toVersion: String?, sessionId: String?): ConversionResponse {
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var fromType = type ?: "json"
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var fromVersion = version ?: "5.0"
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var session = sessionId ?: "new"
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val cliContext = CliContext()
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26+
var validator: ValidationEngine? = validationServiceFactory.getCachedValidator(session)
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if (validator == null || validator.version != fromVersion) {
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val definitions = VersionUtilities.packageForVersion(fromVersion) + "#" +
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VersionUtilities.getCurrentVersion(fromVersion)
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val timeTracker = TimeTracker()
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session = validationServiceFactory.getValidationService()
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.initializeValidator(cliContext, definitions, timeTracker, "new")
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validator = validationServiceFactory.getCachedValidator(session)
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validator?.version = fromVersion
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}
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var input: Path? = null
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var output: Path? = null
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try {
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input = Files.createTempFile("input", ".$fromType")
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Files.writeString(input.toAbsolutePath(), content)
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cliContext.addSource(input.toAbsolutePath().toString())
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output = Files.createTempFile("convert", ".${toType ?: fromType}")
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cliContext.targetVer = toVersion ?: fromVersion
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cliContext.output = output.toAbsolutePath().toString()
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validationServiceFactory.getValidationService().convertSources(cliContext, validator)
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return ConversionResponse(Files.readString(output.toAbsolutePath()), session)
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} finally {
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input?.deleteIfExists()
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output?.deleteIfExists()
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}
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}
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}

‎src/jvmMain/kotlin/controller/conversion/ConversionModule.kt‎

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package controller.conversion
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import constants.CONVERSION_ENDPOINT
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import io.ktor.http.*
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import io.ktor.server.application.*
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import io.ktor.server.request.*
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import io.ktor.server.response.*
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import io.ktor.server.routing.*
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import org.koin.ktor.ext.inject
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const val NO_CONTENT_PROVIDED_MESSAGE = "No content for conversion provided in request."
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const val INVALID_TYPE_MESSAGE = "Invalid type parameter! Supported xml or json."
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const val INVALID_TO_TYPE_MESSAGE = "Invalid toType parameter! Supported xml or json."
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fun Route.conversionModule() {
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18+
val conversionController by inject<ConversionController>()
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post(CONVERSION_ENDPOINT) {
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val logger = call.application.environment.log
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val content = call.receiveText()
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val type = call.request.queryParameters["type"]?.lowercase() ?: when {
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call.request.contentType() == ContentType.Application.Xml -> "xml"
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call.request.contentType() == ContentType.Application.Json -> "json"
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else -> "json"
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}
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val version = call.request.queryParameters["version"] ?: "5.0"
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val toVersion = call.request.queryParameters["toVersion"] ?: version
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val toType = call.request.queryParameters["toType"]?.lowercase() ?: type
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var sessionId = call.request.queryParameters["sessionId"] ?: call.request.header("Session-Id")
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logger.info("Received Conversion Request. Convert to $toVersion FHIR version and $toType type. " +
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"Memory (free/max): ${java.lang.Runtime.getRuntime().freeMemory()}/" +
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"${java.lang.Runtime.getRuntime().maxMemory()}")
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when {
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content.isEmpty() -> {
39+
call.respond(HttpStatusCode.BadRequest, NO_CONTENT_PROVIDED_MESSAGE)
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}
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type != "xml" && type != "json" -> {
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call.respond(HttpStatusCode.BadRequest, INVALID_TYPE_MESSAGE)
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}
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toType != "xml" && toType != "json" -> {
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call.respond(HttpStatusCode.BadRequest, INVALID_TO_TYPE_MESSAGE)
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}
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else -> {
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try {
50+
val (response, session) = conversionController.convertRequest(content, type, version, toType,
51+
toVersion, sessionId)
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val contentType = if (toType == "xml") ContentType.Application.Xml else ContentType.Application.Json
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call.response.headers.append("Session-Id", session)
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call.respondText(response, contentType, HttpStatusCode.OK)
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} catch (e: Exception) {
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logger.error(e.localizedMessage, e)
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call.respond(HttpStatusCode.InternalServerError, e.localizedMessage)
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}
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}
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}
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}
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}

‎src/jvmMain/kotlin/controller/validation/ValidationServiceFactory.kt‎

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package controller.validation
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import org.hl7.fhir.validation.ValidationEngine
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import org.hl7.fhir.validation.cli.services.ValidationService
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56
interface ValidationServiceFactory {
67

78
fun getValidationService() : ValidationService
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fun getCachedValidator(sessionId: String?) : ValidationEngine?
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}

‎src/jvmMain/kotlin/controller/validation/ValidationServiceFactoryImpl.kt‎

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package controller.validation
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import org.hl7.fhir.validation.ValidationEngine
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import java.util.concurrent.TimeUnit;
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import org.hl7.fhir.validation.cli.services.ValidationService
@@ -11,21 +12,34 @@ private const val SESSION_DEFAULT_DURATION: Long = 60
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1213
class ValidationServiceFactoryImpl : ValidationServiceFactory {
1314
private var validationService: ValidationService
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private var sessionCache: SessionCache
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1517
init {
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validationService = createValidationServiceInstance();
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sessionCache = createSessionCacheInstance()
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validationService = createValidationServiceInstance()
1720
}
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19-
fun createValidationServiceInstance() : ValidationService {
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val sessionCacheDuration = System.getenv("SESSION_CACHE_DURATION")?.toLong() ?: SESSION_DEFAULT_DURATION;
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val sessionCache: SessionCache = PassiveExpiringSessionCache(sessionCacheDuration, TimeUnit.MINUTES).setResetExpirationAfterFetch(true);
22-
return ValidationService(sessionCache);
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private fun createSessionCacheInstance(): SessionCache {
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val sessionCacheDuration = System.getenv("SESSION_CACHE_DURATION")?.toLong() ?: SESSION_DEFAULT_DURATION
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return PassiveExpiringSessionCache(sessionCacheDuration, TimeUnit.MINUTES).setResetExpirationAfterFetch(true)
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}
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private fun createValidationServiceInstance() : ValidationService {
27+
sessionCache = createSessionCacheInstance()
28+
return ValidationService(sessionCache)
29+
}
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31+
override fun getCachedValidator(sessionId: String?) : ValidationEngine? {
32+
return if (sessionId != null && sessionCache.sessionExists(sessionId)) {
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sessionCache.fetchSessionValidatorEngine(sessionId)
34+
} else {
35+
null
36+
}
2337
}
2438

2539
override fun getValidationService() : ValidationService {
2640
if (java.lang.Runtime.getRuntime().freeMemory() < MIN_FREE_MEMORY) {
2741
println("Free memory ${java.lang.Runtime.getRuntime().freeMemory()} is less than ${MIN_FREE_MEMORY}. Re-initializing validationService");
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validationService = createValidationServiceInstance();
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validationService = createValidationServiceInstance()
2943
}
3044
return validationService;
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}

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