[
https://issues.apache.org/jira/browse/BEAM-3355?focusedWorklogId=88193&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-88193
]
ASF GitHub Bot logged work on BEAM-3355:
----------------------------------------
Author: ASF GitHub Bot
Created on: 05/Apr/18 18:46
Start Date: 05/Apr/18 18:46
Worklog Time Spent: 10m
Work Description: lostluck commented on a change in pull request #4311:
[BEAM-3355] Diagnostic interfaces
URL: https://github.com/apache/beam/pull/4311#discussion_r179564266
##########
File path: sdks/go/pkg/beam/core/util/hooks/hooks.go
##########
@@ -0,0 +1,184 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You 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.
+
+// Hooks allow runners to tailor execution of the worker to allow for
customization
+// of features used by the harness.
+//
+// Examples of customization:
+//
+// gRPC integration
+// session recording
+// profile recording
+//
+// Registration methods for hooks must be called prior to calling beam.Init()
+// Request methods for hooks must be called as part of building the pipeline
+// request for the runner's Execute method.
+
+package hooks
+
+import (
+ "bytes"
+ "context"
+ "encoding/csv"
+ "encoding/json"
+ "fmt"
+ "os"
+ "strings"
+
+ "github.com/apache/beam/sdks/go/pkg/beam/core/runtime"
+ "github.com/apache/beam/sdks/go/pkg/beam/log"
+ fnpb "github.com/apache/beam/sdks/go/pkg/beam/model/fnexecution_v1"
+)
+
+var (
+ hookRegistry = make(map[string]HookFactory)
+ enabledHooks = make(map[string][]string)
+ activeHooks = make(map[string]Hook)
+)
+
+// A Hook is a set of hooks to run at various stages of executing a
+// pipelne.
+type Hook struct {
+ // Init is called once at the startup of the worker.
+ Init InitHook
+ // Req is called each time the worker handles a FnAPI instruction
request.
+ Req RequestHook
+ // Resp is called each time the worker generates a FnAPI instruction
response.
+ Resp ResponseHook
+}
+
+// InitHook is a hook that is called when the harness
+// initializes.
+type InitHook func(context.Context) error
+
+// HookFactory is a function that produces a Hook from the supplied arguments.
+type HookFactory func([]string) Hook
+
+// RegisterHook registers a Hook for the
+// supplied identifier.
+func RegisterHook(name string, h HookFactory) {
+ hookRegistry[name] = h
+}
+
+// RunInitHooks runs the init hooks.
+func RunInitHooks(ctx context.Context) error {
+ // If an init hook fails to complete, the invariants of the
+ // system are compromised and we can't run a workflow.
+ // The hooks can run in any order. They should not be
+ // interdependent or interfere with each other.
+ for _, h := range activeHooks {
+ if h.Init != nil {
+ if err := h.Init(ctx); err != nil {
+ return err
+ }
+ }
+ }
+ return nil
+}
+
+// RequestHook is called when handling a Fn API instruction.
Review comment:
<!--new_thread; commit:5d13d3df224a378bb27856f0351e23e0898e862b;
resolved:0-->
Fn API -> FnAPI and the same throughout.
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Issue Time Tracking
-------------------
Worklog Id: (was: 88193)
> Make Go SDK runtime harness hooks pluggable
> -------------------------------------------
>
> Key: BEAM-3355
> URL: https://issues.apache.org/jira/browse/BEAM-3355
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Henning Rohde
> Assignee: Bill Neubauer
> Priority: Minor
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> We currently hardcode cpu profiling and session recording in the harness. We
> should make it pluggable instead.
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