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refactor: Extract listResources utility function for handling pagination
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85 changes: 85 additions & 0 deletions
85
src/main/kotlin/org/wfanet/measurement/common/api/grpc/ListResources.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /* | ||
| * Copyright 2024 The Cross-Media Measurement Authors | ||
| * | ||
| * 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 | ||
| * | ||
| * 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 org.wfanet.measurement.common.api.grpc | ||
|
|
||
| import com.google.protobuf.Message | ||
| import io.grpc.kotlin.AbstractCoroutineStub | ||
| import kotlin.coroutines.coroutineContext | ||
| import kotlinx.coroutines.ExperimentalCoroutinesApi | ||
| import kotlinx.coroutines.ensureActive | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.asFlow | ||
| import kotlinx.coroutines.flow.flattenConcat | ||
| import kotlinx.coroutines.flow.flow | ||
| import kotlinx.coroutines.flow.map | ||
|
|
||
| data class ResourceList<T : Message>(val resources: List<T>, val nextPageToken: String) : | ||
| List<T> by resources | ||
|
|
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| /** | ||
| * Lists resources from this stub, handling pagination. | ||
| * | ||
| * @param pageToken page token for initial request | ||
| * @param list function which calls the appropriate List method on the stub | ||
| */ | ||
| fun <T : Message, S : AbstractCoroutineStub<S>> S.listResources( | ||
| pageToken: String = "", | ||
| list: suspend S.(pageToken: String) -> ResourceList<T>, | ||
| ): Flow<ResourceList<T>> = | ||
| listResources(Int.MAX_VALUE, pageToken) { nextPageToken, _ -> list(nextPageToken) } | ||
|
|
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| /** | ||
| * Lists resources from this stub, handling pagination. | ||
| * | ||
| * @param limit maximum number of resources to emit | ||
| * @param pageToken page token for initial request | ||
| * @param list function which calls the appropriate List method on the stub, returning no more than | ||
| * the specified remaining number of resources | ||
| */ | ||
| fun <T : Message, S : AbstractCoroutineStub<S>> S.listResources( | ||
| limit: Int, | ||
| pageToken: String = "", | ||
| list: suspend S.(pageToken: String, remaining: Int) -> ResourceList<T>, | ||
| ): Flow<ResourceList<T>> { | ||
| require(limit > 0) { "limit must be positive" } | ||
| return flow { | ||
| var remaining: Int = limit | ||
| var nextPageToken = pageToken | ||
|
|
||
| while (true) { | ||
| coroutineContext.ensureActive() | ||
|
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| val resourceList: ResourceList<T> = list(nextPageToken, remaining) | ||
| require(resourceList.size <= remaining) { | ||
| "List call must ensure that limit is not exceeded. " + | ||
| "Returned ${resourceList.size} items when only $remaining were remaining" | ||
| } | ||
| emit(resourceList) | ||
|
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| remaining -= resourceList.size | ||
| nextPageToken = resourceList.nextPageToken | ||
| if (nextPageToken.isEmpty() || remaining == 0) { | ||
| break | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /** @see [flattenConcat] */ | ||
| @ExperimentalCoroutinesApi // Overloads experimental `flattenConcat` function. | ||
| fun <T : Message> Flow<ResourceList<T>>.flattenConcat(): Flow<T> = | ||
| map { it.asFlow() }.flattenConcat() |
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