diff --git a/.codecov.yml b/.codecov.yml new file mode 100644 index 0000000..8dc5d7b --- /dev/null +++ b/.codecov.yml @@ -0,0 +1,34 @@ +# SPDX-FileCopyrightText: 2019 Comcast Cable Communications Management, LLC +# SPDX-License-Identifier: Apache-2.0 +--- + +coverage: + range: 50..80 + round: down + precision: 2 + status: + project: + default: + target: auto + threshold: 2% + paths: + - "github.com/xmidt-org/wrp-listener/..." + patch: + default: + target: auto + threshold: 2% + paths: + - "github.com/xmidt-org/wrp-listener/..." + changes: + default: + target: auto + threshold: 2% + paths: + - "github.com/xmidt-org/wrp-listener/..." + +ignore: + - "*_test.go" + - "vendor" + +fixes: + - "github.com/xmidt-org/wrp-listener/::" diff --git a/.github/dependabot.yml b/.github/dependabot.yml new file mode 100644 index 0000000..2fb3c9e --- /dev/null +++ b/.github/dependabot.yml @@ -0,0 +1,26 @@ +# SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +# SPDX-License-Identifier: Apache-2.0 +--- +version: 2 +updates: + + - package-ecosystem: "github-actions" + directory: "/" + schedule: + # Check for updates to GitHub Actions every week + interval: "daily" + labels: + - "dependencies" + commit-message: + prefix: "chore" + include: "scope" + + - package-ecosystem: gomod + directory: / + schedule: + interval: daily + labels: + - "dependencies" + commit-message: + prefix: "feat" + include: "scope" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml new file mode 100644 index 0000000..cd79bd1 --- /dev/null +++ b/.github/workflows/ci.yml @@ -0,0 +1,26 @@ +# SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +# SPDX-License-Identifier: Apache-2.0 +--- +name: CI + +on: + push: + branches: + - main + paths-ignore: + - README.md + - CONTRIBUTING.md + - MAINTAINERS.md + - LICENSE + - NOTICE + tags: + - 'v[0-9]+.[0-9]+.[0-9]+' + pull_request: + workflow_dispatch: + +jobs: + ci: + uses: xmidt-org/shared-go/.github/workflows/ci.yml@5bc4b83f25ff4c944cd6253ba189e50d1997ab3c # v4.1.0 + with: + release-type: library + secrets: inherit diff --git a/.github/workflows/dependabot-approver.yml b/.github/workflows/dependabot-approver.yml new file mode 100644 index 0000000..561ab62 --- /dev/null +++ b/.github/workflows/dependabot-approver.yml @@ -0,0 +1,15 @@ +# SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +# SPDX-License-Identifier: Apache-2.0 +--- +name: 'Dependabot auto approval' + +on: + pull_request_target +permissions: + pull-requests: write + contents: write + +jobs: + package: + uses: xmidt-org/.github/.github/workflows/dependabot-approver-template.yml@main + secrets: inherit diff --git a/.github/workflows/proj-xmidt-team.yml b/.github/workflows/proj-xmidt-team.yml new file mode 100644 index 0000000..9cb9637 --- /dev/null +++ b/.github/workflows/proj-xmidt-team.yml @@ -0,0 +1,17 @@ +# SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +# SPDX-License-Identifier: Apache-2.0 +--- +name: 'PROJ: xmidt-team' + +on: + issues: + types: + - opened + pull_request: + types: + - opened + +jobs: + package: + uses: xmidt-org/.github/.github/workflows/proj-template.yml@proj-v1 + secrets: inherit diff --git a/.golangci.yaml b/.golangci.yaml new file mode 100644 index 0000000..065becf --- /dev/null +++ b/.golangci.yaml @@ -0,0 +1,28 @@ +--- +linters-settings: + misspell: + locale: US + errorlint: + # Report non-wrapping error creation using fmt.Errorf + errorf: false + +linters: + enable: + - bodyclose + - dupl + - errorlint + - funlen + - goconst + - gosec + - misspell + - unconvert + - prealloc + - errcheck + - ineffassign + +issues: + exclude-rules: + - path: _test.go + linters: + - dupl + - funlen diff --git a/.reuse/dep5 b/.reuse/dep5 new file mode 100644 index 0000000..028f2c8 --- /dev/null +++ b/.reuse/dep5 @@ -0,0 +1,48 @@ +Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ +Upstream-Name: eventor +Upstream-Contact: Weston Schmidt +Source: https://github.com/xmidt-org/eventor + +Files: CONTRIBUTING.md +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: .gitignore +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: .golangci.yaml +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: go.mod +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: go.sum +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: .gitignore +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: MAINTAINERS.md +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: CHANGELOG.md +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: README.md +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: .whitesource +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 + +Files: NOTICE +Copyright: SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +License: Apache-2.0 diff --git a/.whitesource b/.whitesource new file mode 100644 index 0000000..55b922e --- /dev/null +++ b/.whitesource @@ -0,0 +1,12 @@ +{ + "scanSettings": { + "baseBranches": [] + }, + "checkRunSettings": { + "vulnerableCheckRunConclusionLevel": "failure", + "displayMode": "diff" + }, + "issueSettings": { + "minSeverityLevel": "LOW" + } +} \ No newline at end of file diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000..a7bc3db --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,66 @@ +Contribution Guidelines +======================= + +We love to see contributions to the project and have tried to make it easy to +do so. If you would like to contribute code to this project you can do so +through GitHub by [forking the repository and sending a pull request](http://gun.io/blog/how-to-github-fork-branch-and-pull-request/). + +Before Comcast merges your code into the project you must sign the +[Comcast Contributor License Agreement (CLA)](https://gist.github.com/ComcastOSS/a7b8933dd8e368535378cda25c92d19a). + +If you haven't previously signed a Comcast CLA, you'll automatically be asked +to when you open a pull request. Alternatively, we can e-mail you a PDF that +you can sign and scan back to us. Please send us an e-mail or create a new +GitHub issue to request a PDF version of the CLA. + +If you have a trivial fix or improvement, please create a pull request and +request a review from a [maintainer](MAINTAINERS.md) of this repository. + +If you plan to do something more involved, that involves a new feature or +changing functionality, please first create an [issue](#issues) so a discussion of +your idea can happen, avoiding unnecessary work and clarifying implementation. + +A relevant coding style guideline is the [Go Code Review Comments](https://code.google.com/p/go-wiki/wiki/CodeReviewComments). + +Documentation +------------- + +If you contribute anything that changes the behavior of the application, +document it in the follow places as applicable: +* the code itself, through clear comments and unit tests +* [README](README.md) + +This includes new features, additional variants of behavior, and breaking +changes. + +Testing +------- + +Tests are written using golang's standard testing tools, and are run prior to +the PR being accepted. + +Issues +------ + +For creating an issue: +* **Bugs:** please be as thorough as possible, with steps to recreate the issue + and any other relevant information. +* **Feature Requests:** please include functionality and use cases. If this is + an extension of a current feature, please include whether or not this would + be a breaking change or how to extend the feature with backwards + compatibility. +* **Security Vulnerability:** please report it at + https://my.xfinity.com/vulnerabilityreport and contact the [maintainers](MAINTAINERS.md). + +If you wish to work on an issue, please assign it to yourself. If you have any +questions regarding implementation, feel free to ask clarifying questions on +the issue itself. + +Pull Requests +------------- + +* should be narrowly focused with no more than 3 or 4 logical commits +* when possible, address no more than one issue +* should be reviewable in the GitHub code review tool +* should be linked to any issues it relates to (i.e. issue number after (#) in commit messages or pull request message) +* should conform to idiomatic golang code formatting diff --git a/LICENSES/Apache-2.0.txt b/LICENSES/Apache-2.0.txt new file mode 100644 index 0000000..137069b --- /dev/null +++ b/LICENSES/Apache-2.0.txt @@ -0,0 +1,73 @@ +Apache License +Version 2.0, January 2004 +http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. Definitions. + +"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. + +"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. + +"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. + +"Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. 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While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. + +END OF TERMS AND CONDITIONS + +APPENDIX: How to apply the Apache License to your work. + +To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +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. diff --git a/MAINTAINERS.md b/MAINTAINERS.md new file mode 100644 index 0000000..9e2b7e5 --- /dev/null +++ b/MAINTAINERS.md @@ -0,0 +1,4 @@ +Maintainers of this repository: + +* John Bass @johnabass +* Weston Schmidt @schmidtw diff --git a/README.md b/README.md index a06125e..7188f4f 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,23 @@ # eventor A simple library to make the observer pattern simpler to implement. + +[![Build Status](https://github.com/xmidt-org/eventor/actions/workflows/ci.yml/badge.svg)](https://github.com/xmidt-org/eventor/actions/workflows/ci.yml) +[![codecov.io](http://codecov.io/github/xmidt-org/eventor/coverage.svg?branch=main)](http://codecov.io/github/xmidt-org/eventor?branch=main) +[![Go Report Card](https://goreportcard.com/badge/github.com/xmidt-org/eventor)](https://goreportcard.com/report/github.com/xmidt-org/eventor) +[![Apache V2 License](http://img.shields.io/badge/license-Apache%20V2-blue.svg)](https://github.com/xmidt-org/eventor/blob/main/LICENSE) +[![GitHub Release](https://img.shields.io/github/release/xmidt-org/eventor.svg)](https://github.com/xmidt-org/eventor/releases) +[![GoDoc](https://pkg.go.dev/badge/github.com/xmidt-org/eventor)](https://pkg.go.dev/github.com/xmidt-org/eventor) + +## Summary + +`eventor`` provides a package to help manage and visit a list of listeners interested +in an event. + +## Code of Conduct + +This project and everyone participating in it are governed by the [XMiDT Code Of Conduct](https://xmidt.io/code_of_conduct/). +By participating, you agree to this Code. + +## Contributing + +Refer to [CONTRIBUTING.md](CONTRIBUTING.md). diff --git a/eventor.go b/eventor.go new file mode 100644 index 0000000..5b738ca --- /dev/null +++ b/eventor.go @@ -0,0 +1,68 @@ +// SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +// SPDX-License-Identifier: Apache-2.0 + +package eventor + +import ( + "container/list" + "sync" +) + +// CancelFunc removes the listener it's associated with and cancels any +// future events sent to that listener. +// +// A CancelFunc is idempotent: after the first invocation, calling this +// closure will have no effect. +type CancelFunc func() + +// Eventor is a generic container of Eventor that is safe for concurrent access +// and concurrent dispatch of events through the visit method. +type Eventor[T any] struct { + lock sync.RWMutex + listeners *list.List +} + +// Cancel creates an idempotent closure that removes the given linked list element. +func (l *Eventor[T]) Cancel(e *list.Element) CancelFunc { + return func() { + l.lock.Lock() + defer l.lock.Unlock() + + // NOTE: Remove is idempotent: it will not do anything if e is not in the list + l.listeners.Remove(e) + } +} + +// Add inserts a new listener into the list and returns a closure that will +// remove the listener from the list. +// +// This method is atomic with respect to Visit. +// +// The returned closure is idempotent: after the first invocation, calling +// this closure will have no effect. +func (l *Eventor[T]) Add(listener T) CancelFunc { + l.lock.Lock() + defer l.lock.Unlock() + + if l.listeners == nil { + l.listeners = list.New() + } + + e := l.listeners.PushBack(listener) + return l.Cancel(e) +} + +// Visit applies the given closure to each listener in the list. This method +// is atomic with respect to Add. +func (l *Eventor[T]) Visit(f func(T)) { + l.lock.RLock() + defer l.lock.RUnlock() + + if l.listeners == nil || f == nil { + return + } + + for e := l.listeners.Front(); e != nil; e = e.Next() { + f(e.Value.(T)) + } +} diff --git a/eventor_test.go b/eventor_test.go new file mode 100644 index 0000000..efe0b76 --- /dev/null +++ b/eventor_test.go @@ -0,0 +1,84 @@ +// SPDX-FileCopyrightText: 2023 Comcast Cable Communications Management, LLC +// SPDX-License-Identifier: Apache-2.0 + +package eventor + +import ( + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestBasicUseCase(t *testing.T) { + assert := assert.New(t) + + // Define a listener type. It can be anything. + type listenerType int + + // Create an Eventor that holds listeners of type listenerType. + eator := Eventor[*listenerType]{} + + // Show that nothing happens if we visit an empty Eventor. + eator.Visit(func(i *listenerType) { + assert.Fail("should not be called") + }) + + // Create 3 listeners. + var a listenerType + var b listenerType + var c listenerType + + // Add two of them to the Eventor. + cancelA := eator.Add(&a) + cancelB := eator.Add(&b) + + // Show that we can visit the Eventor and the two listeners we added are visited. + var count int + eator.Visit(func(i *listenerType) { + count++ + }) + assert.Equal(2, count) + + // Show that we can add a nil listener and that it is visited. + cancelD := eator.Add(nil) + count = 0 + eator.Visit(func(i *listenerType) { + count++ + }) + assert.Equal(3, count) + + // Show it's safe to call cancel on a nil listener. + cancelD() + + // Let's add the third listener. + // Show that we can visit the Eventor and all three listeners are visited. + cancelC := eator.Add(&c) + count = 0 + eator.Visit(func(i *listenerType) { + count++ + }) + assert.Equal(3, count) + + // Show that we can cancel a listener and it is no longer visited. + cancelB() + count = 0 + eator.Visit(func(i *listenerType) { + count++ + }) + assert.Equal(2, count) + + // Oops, we passed in a nil function. Show that it is safe. + eator.Visit(nil) + + // Show that we can cancel a listener and it is no longer visited. + cancelA() + cancelC() + eator.Visit(func(i *listenerType) { + assert.Fail("should not be called") + }) + + // Show that cancel is idempotent. + cancelA() + cancelB() + cancelC() +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..7b38eaa --- /dev/null +++ b/go.mod @@ -0,0 +1,11 @@ +module github.com/xmidt-org/eventor + +go 1.21.0 + +require github.com/stretchr/testify v1.8.4 + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..fa4b6e6 --- /dev/null +++ b/go.sum @@ -0,0 +1,10 @@ +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk= +github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=