feat(controller-runtime): enable recover true option

[haarchri]

Description of your changes

Presently, in the reconciler, an unhandled panic remains unrecovered, leading to potential crashes in the provider. This poses a significant issue since a panic could be triggered by a single managed resource in an unforeseen state. Consequently, one problematic managed resource has the potential to obstruct the processing of all other managed resources from provider.

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

tested with crossplane-contrib/provider-upjet-aws#780

prior to this PR, the provider experiences a crash, resulting in the following stack trace:

2023-08-01T10:54:41+02:00       INFO    Observed a panic in reconciler: assignment to entry in nil map  {"controller": "managed/efs.aws.upbound.io/v1beta1, kind=filesystem", "namespace": "", "name": "example", "reconcileID": "cd513dc8-b3cb-4e5f-8475-b86a8bcef6b4"}
panic: assignment to entry in nil map [recovered]
        panic: assignment to entry in nil map

goroutine 28848 [running]:
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile.func1()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:115 +0x1a8
panic({0x106d08420, 0x1075f79e0})
        runtime/panic.go:884 +0x204
github.com/upbound/provider-aws/internal/clients.DefaultTerraformSetupBuilder({0x10762ad90, 0x14001e3b920}, {0x10763d320?, 0x140001daea0?}, {0x1076ad320?, 0x14006dc2300?}, 0x140070f1520, 0x140092f1dc8)
        github.com/upbound/provider-aws/internal/clients/aws.go:187 +0x504
github.com/upbound/provider-aws/internal/clients.SelectTerraformSetup.func1({0x10762ad90, 0x14001e3b920}, {0x10763d320, 0x140001daea0}, {0x1076ad320?, 0x14006dc2300?})
        github.com/upbound/provider-aws/internal/clients/aws.go:81 +0x230
github.com/upbound/upjet/pkg/controller.(*Connector).Connect(0x14006a30190, {0x10762ad90, 0x14001e3b920}, {0x1076ad320, 0x14006dc2300})
        github.com/upbound/[email protected]/pkg/controller/external.go:94 +0x7c
github.com/crossplane/crossplane-runtime/pkg/reconciler/managed.(*NopDisconnecter).Connect(0x14006a1e640?, {0x10762ad90?, 0x14001e3b920?}, {0x1076ad320?, 0x14006dc2300?})
        github.com/crossplane/[email protected]/pkg/reconciler/managed/reconciler.go:244 +0x38
github.com/crossplane/crossplane-runtime/pkg/reconciler/managed.(*Reconciler).Reconcile(0x140069ebef0, {0x10762adc8, 0x1400aabc2d0}, {{{0x0?, 0x0?}, {0x1400de24730?, 0x7?}}})
        github.com/crossplane/[email protected]/pkg/reconciler/managed/reconciler.go:839 +0x1cac
github.com/crossplane/crossplane-runtime/pkg/ratelimiter.(*Reconciler).Reconcile(0x14006a30230, {0x10762adc8, 0x1400aabc2d0}, {{{0x0?, 0x30?}, {0x1400de24730?, 0x10b8f2b01?}}})
        github.com/crossplane/[email protected]/pkg/ratelimiter/reconciler.go:54 +0x124
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile(0x10762adc8?, {0x10762adc8?, 0x1400aabc2d0?}, {{{0x0?, 0x106bd5580?}, {0x1400de24730?, 0xf0304140b6f1631d?}}})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:118 +0x8c
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0x140069dd860, {0x10762ad20, 0x14000890880}, {0x1070ef480?, 0x1400d866000?})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:314 +0x2f8
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0x140069dd860, {0x10762ad20, 0x14000890880})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:265 +0x1b0
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:226 +0x74
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:222 +0x28c
make: *** [run] Error 2

with this pull request, it becomes evident that the controller is now capable of recovering from panic, and as a result, the provider remains operational and functional for all other managed resources:

2023-08-01T10:52:41+02:00       DEBUG   provider-aws    Reconciling     {"controller": "managed/efs.aws.upbound.io/v1beta1, kind=filesystem", "request": {"name":"example"}}
E0801 10:52:41.773136   66620 runtime.go:79] Observed a panic: "assignment to entry in nil map" (assignment to entry in nil map)
goroutine 29483 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic({0x104974420?, 0x1052639e0})
        k8s.io/[email protected]/pkg/util/runtime/runtime.go:75 +0x7c
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile.func1()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:107 +0xa4
panic({0x104974420, 0x1052639e0})
        runtime/panic.go:884 +0x204
github.com/upbound/provider-aws/internal/clients.DefaultTerraformSetupBuilder({0x105296d90, 0x1400080e0c0}, {0x1052a9320?, 0x140000f8630?}, {0x105319320?, 0x1400091a000?}, 0x14000659d40, 0x140017abdc8)
        github.com/upbound/provider-aws/internal/clients/aws.go:187 +0x504
github.com/upbound/provider-aws/internal/clients.SelectTerraformSetup.func1({0x105296d90, 0x1400080e0c0}, {0x1052a9320, 0x140000f8630}, {0x105319320?, 0x1400091a000?})
        github.com/upbound/provider-aws/internal/clients/aws.go:81 +0x230
github.com/upbound/upjet/pkg/controller.(*Connector).Connect(0x14004b1ceb0, {0x105296d90, 0x1400080e0c0}, {0x105319320, 0x1400091a000})
        github.com/upbound/[email protected]/pkg/controller/external.go:94 +0x7c
github.com/crossplane/crossplane-runtime/pkg/reconciler/managed.(*NopDisconnecter).Connect(0x14004ad3ae0?, {0x105296d90?, 0x1400080e0c0?}, {0x105319320?, 0x1400091a000?})
        github.com/crossplane/[email protected]/pkg/reconciler/managed/reconciler.go:244 +0x38
github.com/crossplane/crossplane-runtime/pkg/reconciler/managed.(*Reconciler).Reconcile(0x14004ad1e00, {0x105296dc8, 0x1400f4bf770}, {{{0x0?, 0x0?}, {0x1400bee4310?, 0x7?}}})
        github.com/crossplane/[email protected]/pkg/reconciler/managed/reconciler.go:839 +0x1cac
github.com/crossplane/crossplane-runtime/pkg/ratelimiter.(*Reconciler).Reconcile(0x14004b1cf50, {0x105296dc8, 0x1400f4bf770}, {{{0x0?, 0x30?}, {0x1400bee4310?, 0x10955ca01?}}})
        github.com/crossplane/[email protected]/pkg/ratelimiter/reconciler.go:54 +0x124
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile(0x105296dc8?, {0x105296dc8?, 0x1400f4bf770?}, {{{0x0?, 0x104841580?}, {0x1400bee4310?, 0xf0304140b6f1631d?}}})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:118 +0x8c
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0x14004b06d20, {0x105296d20, 0x14000036a00}, {0x104d5b480?, 0x14007723680?})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:314 +0x2f8
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0x14004b06d20, {0x105296d20, 0x14000036a00})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:265 +0x1b0
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:226 +0x74
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:222 +0x28c

2023-08-01T10:52:41+02:00       ERROR   Reconciler error        {"controller": "managed/efs.aws.upbound.io/v1beta1, kind=filesystem", "namespace": "", "name": "example", "reconcileID": "84119f62-06be-4d24-a01c-bf7d63ed1338", "error": "panic: assignment to entry in nil map [recovered]"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:324
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:265
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:226

tested with the following configs and manifests:

add to go.mod and run go mod tidy
replace github.com/crossplane/crossplane-runtime => github.com/haarchri/crossplane-runtime v0.21.0-rc.0.0.20230801-e147d407d7eddcd57891fc85d68315c1917d072f

apply the following resources:

kubectl -n upbound-system create secret generic aws-creds --from-literal=credentials="${UPTEST_CLOUD_CREDENTIALS}" \
    --dry-run=client -o yaml | kubectl apply -f -

apiVersion: aws.upbound.io/v1beta1
kind: ProviderConfig
metadata:
  name: 780-issue-nil
spec:
  credentials:
    source: Secret
    secretRef:
      name: aws-creds
      namespace: upbound-system
      key: credentials
  endpoint:
    hostnameImmutable:  true
    services:
      - apigateway
      - apigatewayv2
      - cloudformation
      - cloudwatch
      - dynamodb
      - ec2
      - es
      - elasticache
      - firehose
      - iam
      - kinesis
      - lambda
      - rds
      - redshift
      - route53
      - s3
      - secretsmanager
      - ses
      - sns
      - sqs
      - ssm
      - stepfunctions
      - sts
    url:
      static:                   http://127.0.0.1:4566
      type:                     Static
  skip_credentials_validation:  true
  skip_metadata_api_check:      true
  skip_requesting_account_id:   true

apiVersion: efs.aws.upbound.io/v1beta1
kind: FileSystem
metadata:
  name: example
  labels:
    testing.upbound.io/example-name: efs
spec:
  forProvider:
    region: us-west-1
    creationToken: my-product
    tags:
      Name: MyProduct
  providerConfigRef:
    name: 780-issue-nil

[sttts]

Sgtm. One question: is there a backoff of controller restarts?

[pedjak]

nit: perhaps to rephrase PR title to reflect that we did not add any new option, we just activate recover from panic controller option.