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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /** | ||
| * Copyright (c) 2022 Gitpod GmbH. All rights reserved. | ||
| * Licensed under the GNU Affero General Public License (AGPL). | ||
| * See License-AGPL.txt in the project root for license information. | ||
| */ | ||
|
|
||
| import { isAbortError } from "abort-controller-x"; | ||
| import { | ||
| CallOptions, | ||
| ClientError, | ||
| ClientMiddleware, | ||
| ClientMiddlewareCall, | ||
| Status, | ||
| MethodDescriptor, | ||
| } from "nice-grpc-common"; | ||
| import { GrpcMethodType, IClientCallMetrics } from "./grpc"; | ||
|
|
||
| function getLabels(method: MethodDescriptor) { | ||
| const callType = method.requestStream | ||
| ? method.responseStream | ||
| ? "bidi_stream" | ||
| : "client_stream" | ||
| : method.responseStream | ||
| ? "server_stream" | ||
| : "unary"; | ||
| const { path } = method; | ||
| const [serviceName, methodName] = path.split("/").slice(1); | ||
|
|
||
| return { | ||
| type: callType as GrpcMethodType, | ||
| service: serviceName, | ||
| method: methodName, | ||
| }; | ||
| } | ||
|
|
||
| async function* incrementStreamMessagesCounter<T>(iterable: AsyncIterable<T>, callback: () => void): AsyncIterable<T> { | ||
| for await (const item of iterable) { | ||
| callback(); | ||
| yield item; | ||
| } | ||
| } | ||
|
|
||
| export function prometheusClientMiddleware(metrics: IClientCallMetrics): ClientMiddleware { | ||
| return async function* prometheusClientMiddlewareGenerator<Request, Response>( | ||
| call: ClientMiddlewareCall<Request, Response>, | ||
| options: CallOptions, | ||
| ): AsyncGenerator<Response, Response | void, undefined> { | ||
| const labels = getLabels(call.method); | ||
|
|
||
| metrics.started(labels); | ||
|
|
||
| let settled = false; | ||
| let status: Status = Status.OK; | ||
|
|
||
| try { | ||
| let request; | ||
|
|
||
| if (!call.requestStream) { | ||
| request = call.request; | ||
| } else { | ||
| request = incrementStreamMessagesCounter(call.request, metrics.sent.bind(metrics, labels)); | ||
| } | ||
|
|
||
| if (!call.responseStream) { | ||
| const response = yield* call.next(request, options); | ||
| settled = true; | ||
| return response; | ||
| } else { | ||
| yield* incrementStreamMessagesCounter( | ||
| call.next(request, options), | ||
| metrics.received.bind(metrics, labels), | ||
| ); | ||
| settled = true; | ||
| return; | ||
| } | ||
| } catch (err) { | ||
| settled = true; | ||
| if (err instanceof ClientError) { | ||
| status = err.code; | ||
| } else if (isAbortError(err)) { | ||
| status = Status.CANCELLED; | ||
| } else { | ||
| status = Status.UNKNOWN; | ||
| } | ||
| throw err; | ||
| } finally { | ||
| if (!settled) { | ||
| status = Status.CANCELLED; | ||
| } | ||
| metrics.handled({ ...labels, code: Status[status] }); | ||
| } | ||
| }; | ||
| } |
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