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38ad2f41ac
**What changed?** Add an interceptor to return Unavailable to WorkflowService methods until the frontend considers itself "healthy", which currently means "membership is initialized". **Why?** Fixes #5015 **How did you test it?** mostly manually **Potential risks** This adds a window of time where frontend can now return Unavailable where previously it might have succeeded or returned a different error code. Specifically note that client.Dial in go sdk (at least) will fail fast on this error and the caller will need to retry. --------- Co-authored-by: Tim Deeb-Swihart <[email protected]>
72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
// The MIT License
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//
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// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
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//
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// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package interceptor
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import (
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"context"
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"strings"
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"sync/atomic"
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"go.temporal.io/api/serviceerror"
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"google.golang.org/grpc"
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"go.temporal.io/server/common/api"
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)
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type (
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HealthInterceptor struct {
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healthy atomic.Bool
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}
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)
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var _ grpc.UnaryServerInterceptor = (*HealthInterceptor)(nil).Intercept
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var notHealthyErr = serviceerror.NewUnavailable("Frontend is not healthy yet")
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// NewHealthInterceptor returns a new HealthInterceptor. It starts with state not healthy.
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func NewHealthInterceptor() *HealthInterceptor {
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return &HealthInterceptor{}
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}
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func (i *HealthInterceptor) Intercept(
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ctx context.Context,
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req interface{},
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info *grpc.UnaryServerInfo,
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handler grpc.UnaryHandler,
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) (interface{}, error) {
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// only enforce health check on WorkflowService and OperatorService
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if strings.HasPrefix(info.FullMethod, api.WorkflowServicePrefix) ||
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strings.HasPrefix(info.FullMethod, api.OperatorServicePrefix) {
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if !i.healthy.Load() {
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return nil, notHealthyErr
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}
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}
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return handler(ctx, req)
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}
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func (i *HealthInterceptor) SetHealthy(healthy bool) {
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i.healthy.Store(healthy)
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}
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