feat: Add subscriptions support to ktor server #1774
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| * Copyright 2023 Expedia, Inc | ||
| * | ||
| * 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 | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.expediagroup.graphql.examples.server.ktor.schema | ||
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| import com.expediagroup.graphql.generator.annotations.GraphQLDescription | ||
| import com.expediagroup.graphql.server.operations.Subscription | ||
| import graphql.GraphqlErrorException | ||
| import graphql.execution.DataFetcherResult | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.flow | ||
| import kotlinx.coroutines.flow.flowOf | ||
| import kotlinx.coroutines.flow.map | ||
| import kotlinx.coroutines.reactive.asPublisher | ||
| import org.reactivestreams.Publisher | ||
| import kotlin.random.Random | ||
|
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| class ExampleSubscriptionService : Subscription { | ||
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| @GraphQLDescription("Returns a single value") | ||
| fun singleValue(): Flow<Int> = flowOf(1) | ||
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| @GraphQLDescription("Returns stream of values") | ||
| fun multipleValues(): Flow<Int> = flowOf(1, 2, 3) | ||
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| @GraphQLDescription("Returns a random number every second") | ||
| suspend fun counter(limit: Int? = null): Flow<Int> = flow { | ||
| var count = 0 | ||
| while (true) { | ||
| count++ | ||
| if (limit != null) { | ||
| if (count > limit) break | ||
| } | ||
| emit(Random.nextInt()) | ||
| delay(1000) | ||
| } | ||
| } | ||
|
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| @GraphQLDescription("Returns a random number every second, errors if even") | ||
| fun counterWithError(): Flow<Int> = flow { | ||
| while (true) { | ||
| val value = Random.nextInt() | ||
| if (value % 2 == 0) { | ||
| throw Exception("Value is even $value") | ||
| } else emit(value) | ||
| delay(1000) | ||
| } | ||
| } | ||
|
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| @GraphQLDescription("Returns one value then an error") | ||
| fun singleValueThenError(): Flow<Int> = flowOf(1, 2) | ||
| .map { if (it == 2) throw Exception("Second value") else it } | ||
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| @GraphQLDescription("Returns stream of errors") | ||
| fun flowOfErrors(): Publisher<DataFetcherResult<String?>> { | ||
| val dfr: DataFetcherResult<String?> = DataFetcherResult.newResult<String?>() | ||
| .data(null) | ||
| .error(GraphqlErrorException.newErrorException().cause(Exception("error thrown")).build()) | ||
| .build() | ||
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| return flowOf(dfr, dfr).asPublisher() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| /* | ||
| * Copyright 2023 Expedia, Inc | ||
| * | ||
| * 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 | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| package com.expediagroup.graphql.server.ktor.subscriptions | ||
|
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| import io.ktor.server.websocket.* | ||
|
|
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| interface KtorGraphQLSubscriptionHandler { | ||
| suspend fun handle(session: WebSocketServerSession) | ||
| } |
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can we make it lazily created? not everyone needs subscriptions so this object may never be used