diff --git a/.gitignore b/.gitignore index 66fd13c..00ee230 100644 --- a/.gitignore +++ b/.gitignore @@ -13,3 +13,6 @@ # Dependency directories (remove the comment below to include it) # vendor/ + +# JetBrains/GoLand +/.idea diff --git a/README.md b/README.md index ebc013e..1ccc90d 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,203 @@ -# frosting -Enhance the operational tasks of your application with a little _frosting_ + +

+
+ playing card +
+ Frosting +
+

+ +

Enhance the operational tasks of your application with a little frosting ๐Ÿง

+ +

+ + + + + + + + + + +

+ +

+ Introduction โ€ข + Install โ€ข + How To Use โ€ข + Credits โ€ข + Support โ€ข + Related โ€ข + License +

+ +## ๐Ÿ‘‹ Introduction + +`frosting` is library that lets you quickly and easily create a CLI for your code repositories (like how a `Makefile` enables you to run `make build`). Inspired by [Make][make], [Mage][mage], [Task][taskfile] and others. + +## ๐ŸŽฏ Features + +| Feature | Frost | Make | Mage | Go-Task | +|----------------------------------|-------|------|------|---------| +| *File | Go | Make | Go | Yaml | +| Bash Support | ๐Ÿง | ๐Ÿฎ | ๐Ÿง™ | ๐Ÿน | +| Target-Specific Vars | ๐Ÿง | ๐Ÿฎ | ๐Ÿง™ | ๐Ÿน | +| Namespaces | ๐Ÿง | ๐Ÿฎ | | ๐Ÿน | +| Imported Targets | ๐Ÿง | ๐Ÿฎ | ๐Ÿง™ | ๐Ÿนโ€ก | +| Bash/Zsh Autocomplete | ๐Ÿง | ๐Ÿฎ | | ๐Ÿน | +| Parallelism | ๐Ÿง | | ๐Ÿง™โ€  | | +| No Custom DSL to Learn | ๐Ÿง | | ๐Ÿง™ | | +| Target Args | ๐Ÿง | | | | +| Target Flags | ๐Ÿง | | | | +| Target-Specific Help | ๐Ÿง | | | | +| [Color Support][color] | ๐Ÿง | | | | +| Doc Generation | ๐Ÿง | | | | +| [Interative Terminal UI][tview] | ๐Ÿง | | | | +| [go-prompt][gpt] Integration | ๐Ÿง | | | | +| [Progress Bars][pb] | ๐Ÿง | | | | +| [Spinners][spin] | ๐Ÿง | | | | + +โ€  Yes, but with some limitations ([#273](https://github.com/magefile/mage/pull/273)) + +โ€ก Task support for imports is still experimental + +## ๐Ÿ’ก Philosophy + +Mage puts it nicely in regards to make/bash: + +> Makefiles are hard to read and hard to write. Mostly because makefiles are essentially fancy bash scripts with significant white space and additional make-related syntax. Go is superior to bash for any non-trivial task involving branching, looping, anything thatโ€™s not just straight line execution of commands. + +Mage makes heavy use of code generation in order to create the resulting binary, and I found that to be a high barrier to entry for contributing to the project. + +I've been itching to write my own CLI for awhile now, and I think I finally landed on a great use case. + +## โšก๏ธ Quickstart + +```go +package main + +import ( + "context" + "fmt" + "os" + + "github.com/cakehappens/frosting" +) + +func NewBuildIngredient(name string, options ...frosting.IngredientOption) *frosting.Ingredient { + return frosting.MustNewIngredient( + name, + func(ctx context.Context, ing *frosting.Ingredient) error { + fmt.Println("Building...") + return nil + }, + append([]frosting.IngredientOption{ + frosting.WithHelpDescriptions("buildShort", "buildLong"), + }, options...)..., + ) +} + +func NewTestIngredient(name string, options ...frosting.IngredientOption) *frosting.Ingredient { + return frosting.MustNewIngredient( + name, + func(ctx context.Context, ing *frosting.Ingredient) error { + fmt.Println("Testing...") + return nil + }, + options..., + ) +} + +func main() { + f := frosting.New("frost") + + { + build := NewBuildIngredient("build") + + // test depends on build + test := NewTestIngredient( + "test", + frosting.WithDependencies(build), + ) + + f.Group( + "Basic Commands (Beginner):", + build, + test, + ) + } + + f.Execute(os.Args[1:]...) +} + + +``` + +```bash +go build -o frost +frost # prints help +frost build # runs build ingredient +frost build --help # prints build-target help +``` + +## ๐ŸŽ“ Docs + +see [docs](docs) for more info, or look at the [godocs](https://pkg.go.dev/github.com/cakehappens/frosting) + +## ๐Ÿ‘€ Examples + +see [examples](examples) + +## ๐ŸŒŸ Contribute + +I'll definitely get some templates/guidelines setup soon... + +## ๐Ÿค— Support + + + + + +## ๐Ÿ“– Reading + +- https://dave.cheney.net/2017/06/11/go-without-package-scoped-variables +- https://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis +- https://dave.cheney.net/2016/04/27/dont-just-check-errors-handle-them-gracefully +- https://dave.cheney.net/tag/logging +- https://stackoverflow.com/questions/2214575/passing-arguments-to-make-run + +## ๐Ÿ’• Related & Inspiration + +- [Mage][mage] +- [Taskfile][taskfile] +- [Make][make] +- [Makem.sh][https://github.com/alphapapa/makem.sh] + +## ๐Ÿ“œ Credits + +- [spf13/cobra][cobra] +- [spf13/viper][viper] +- [tivo/tview][tview] +- [theckman/yackspin][spin] +- [c-bata/go-prompt][gpt] +- [gosuri/uiprogress][pb] +- [fatih/color][color] +- Icons made by [Freepik](https://www.freepik.com) from [www.flaticon.com](http://www.flaticon.com) is licensed by [CC 3.0 BY](http://creativecommons.org/licenses/by/3.0/) + +## โš–๏ธ License + +[Apache License, Version 2.0, http://www.apache.org/licenses/](LICENSE) + +[make]: https://www.gnu.org/software/make/ +[taskfile]: https://taskfile.dev/ +[mage]: https://magefile.org/ +[cobra]: https://github.com/spf13/cobra +[viper]: https://github.com/spf13/viper +[gpt]: https://github.com/c-bata/go-prompt +[spin]: https://github.com/theckman/yacspin +[pb]: https://github.com/gosuri/uiprogress +[color]: https://github.com/fatih/color +[tview]: https://github.com/rivo/tview diff --git a/assets/cupcake.png b/assets/cupcake.png new file mode 100644 index 0000000..2ceb113 Binary files /dev/null and b/assets/cupcake.png differ diff --git a/command.go b/command.go new file mode 100644 index 0000000..46d12c3 --- /dev/null +++ b/command.go @@ -0,0 +1,29 @@ +package frosting + +import "github.com/spf13/cobra" + +type defaultCommandBuilder struct{} + +func newSimpleCommandBuilder() *defaultCommandBuilder { + return &defaultCommandBuilder{} +} + +type CommandBuilder interface { + Build(ingredient *Ingredient) (*cobra.Command, error) +} + +func (c *defaultCommandBuilder) Build(ingredient *Ingredient) (*cobra.Command, error) { + cmd := &cobra.Command{ + Use: ingredient.name, + Short: ingredient.short, + Long: ingredient.long, + Example: ingredient.example, + Aliases: ingredient.aliases, + } + + if ingredient.flagsFn != nil { + ingredient.flagsFn(cmd.Flags()) + } + + return cmd, nil +} diff --git a/docs/README.md b/docs/README.md new file mode 100644 index 0000000..d0fa60e --- /dev/null +++ b/docs/README.md @@ -0,0 +1 @@ +# Docs diff --git a/docs/getting-started.md b/docs/getting-started.md new file mode 100644 index 0000000..936cdcb --- /dev/null +++ b/docs/getting-started.md @@ -0,0 +1,64 @@ +# Architecture + +## Quick Start + +`frosting` is made up of `Ingredient`s (pun intended). An ingredient is analogous to a `target` in a make file. + +### Library Code Example + +๐Ÿ“Œ _Let the caller define the name of the target_ + +๐Ÿท๏ธ _Ingredients are ** **globally unique by name** **, to allow different ingredients to have the same dependencies, but ensuring we don't call the dependent ingredient more than once._ + +```go +func NewBuildIngredient(name string, options ...frosting.IngredientOption) *frosting.Ingredient { + return frosting.MustNewIngredient( + name, + func(ctx context.Context, ing *frosting.Ingredient) error { + fmt.Println("Building...") + return nil + }, + append([]frosting.IngredientOption{ + frosting.WithHelpDescriptions("buildShort", "buildLong"), + }, options...)..., + ) +} +``` + +Next, mix ingredients into frosting by adding them to a group. This provides a nice interface for getting help about related ingredients. +Ingredients are still ** **globally unique by name** ** regardless of group. + +``` +$ frost help +Add a little frosting to your operational tasks.. + +Basic Commands (Beginner): + build Build Things + test Test Things +``` + +```go +func main() { + f := frosting.New("frost") + + { + build := NewBuildIngredient("build") + + // test depends on build + test := NewTestIngredient( + "test", + frosting.WithDependencies(build), + ) + + f.Group( + "Basic Commands (Beginner):", + build, + test, + ) + } + + f.Execute(os.Args[1:]...) +} +``` + +๐Ÿ‘€ For more information, check out the [examples](../examples)! diff --git a/docs/internals.md b/docs/internals.md new file mode 100644 index 0000000..4543798 --- /dev/null +++ b/docs/internals.md @@ -0,0 +1,7 @@ +# Internals + +Once ingredients are defined and "imported" into a frosting client (see [getting-started](./getting-started.md)), + +```go + +``` diff --git a/examples/full/Dockerfile b/examples/full/Dockerfile new file mode 100644 index 0000000..2e9204b --- /dev/null +++ b/examples/full/Dockerfile @@ -0,0 +1,18 @@ +FROM debian:buster-slim + +RUN set -ex; \ + apt-get update; \ + apt-get install --no-install-recommends -y \ + bash \ + ca-certificates \ + sudo \ + locales \ + procps \ + ; \ + apt-get autoclean; \ + rm -rf /var/lib/apt-lists/*; + +SHELL [ "/bin/bash", "-Eexuo", "pipefail", "-c" ] + +ENTRYPOINT [ "/bin/bash" ] +CMD [ "-c" "echo hello" ] diff --git a/examples/full/README.md b/examples/full/README.md new file mode 100644 index 0000000..60076c0 --- /dev/null +++ b/examples/full/README.md @@ -0,0 +1,17 @@ +# Full Example + +Lots of Bells and Whistles + +## Imagine + +Imagine that this is the _root_ of your project repo. It doesn't matter what language, node, python, go, etc. + +The recommended approach is to put all of your frosting in a subfolder, as to not interfere if you are building a go application. + +## Getting Started + +Compile into a binary + +```shell +go build -o fr ./frosting +``` diff --git a/examples/minimal/.gitignore b/examples/minimal/.gitignore new file mode 100644 index 0000000..0c498aa --- /dev/null +++ b/examples/minimal/.gitignore @@ -0,0 +1,22 @@ +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib + +# Test binary, built with `go test -c` +*.test + +# Output of the go coverage tool, specifically when used with LiteIDE +*.out + +# Dependency directories (remove the comment below to include it) +# vendor/ + +# JetBrains/GoLand +/.idea + +# Frosting Binary +/fr +/frost diff --git a/examples/minimal/README.md b/examples/minimal/README.md new file mode 100644 index 0000000..ccc2e17 --- /dev/null +++ b/examples/minimal/README.md @@ -0,0 +1,17 @@ +# Minimal Example + +The Newbie Tutorial + +## Imagine + +Imagine that this is the _root_ of your project repo. It doesn't matter what language, node, python, go, etc. + +The recommended approach is to put frosting in a subfolder, as to not interfere if you are building a go application. + +## Getting Started + +Compile into a binary + +```shell +go build -o frost ./frosting +``` \ No newline at end of file diff --git a/examples/minimal/frosting/go.mod b/examples/minimal/frosting/go.mod new file mode 100644 index 0000000..bda88a6 --- /dev/null +++ b/examples/minimal/frosting/go.mod @@ -0,0 +1,7 @@ +module github.com/cakehappens/frosting/examples/minimal/frosting + +go 1.14 + +replace github.com/cakehappens/frosting => ../../.. + +require github.com/cakehappens/frosting v0.0.0-00010101000000-000000000000 // indirect diff --git a/examples/minimal/frosting/go.sum b/examples/minimal/frosting/go.sum new file mode 100644 index 0000000..733ebb2 --- /dev/null +++ b/examples/minimal/frosting/go.sum @@ -0,0 +1,376 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 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v0.0.0-20160121211510-db5cfe13f5cc/go.mod h1:so/NYdZXCz+E3ZpW0uAoCj6uzU2+8OWDFv/HxUSs7kI= diff --git a/examples/minimal/frosting/main.go b/examples/minimal/frosting/main.go new file mode 100644 index 0000000..ab9e243 --- /dev/null +++ b/examples/minimal/frosting/main.go @@ -0,0 +1,55 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/cakehappens/frosting" +) + +func NewBuildIngredient(name string, options ...frosting.IngredientOption) *frosting.Ingredient { + return frosting.MustNewIngredient( + name, + func(ctx context.Context, ing *frosting.Ingredient) error { + fmt.Println("Building...") + return nil + }, + append([]frosting.IngredientOption{ + frosting.WithHelpDescriptions("buildShort", "buildLong"), + }, options...)..., + ) +} + +func NewTestIngredient(name string, options ...frosting.IngredientOption) *frosting.Ingredient { + return frosting.MustNewIngredient( + name, + func(ctx context.Context, ing *frosting.Ingredient) error { + fmt.Println("Testing...") + return nil + }, + options..., + ) +} + +func main() { + f := frosting.New("frost") + + { + build := NewBuildIngredient("build") + + // test depends on build + test := NewTestIngredient( + "test", + frosting.WithDependencies(build), + ) + + f.Group( + "Basic Commands (Beginner):", + build, + test, + ) + } + + f.Execute(os.Args[1:]...) +} diff --git a/examples/minimal/frosting/main_test.go b/examples/minimal/frosting/main_test.go new file mode 100644 index 0000000..06ab7d0 --- /dev/null +++ b/examples/minimal/frosting/main_test.go @@ -0,0 +1 @@ +package main diff --git a/frosting.go b/frosting.go new file mode 100644 index 0000000..b71b077 --- /dev/null +++ b/frosting.go @@ -0,0 +1,146 @@ +package frosting + +import ( + "context" + "errors" + "fmt" + "github.com/spf13/cobra" + "k8s.io/kubectl/pkg/util/templates" + "os" + "os/signal" + //"reflect" + //"runtime" + //"strings" + "syscall" + + "github.com/fatih/color" + "github.com/oklog/run" +) + +type ClientInfo struct { + rootCommand *cobra.Command + ingredientGroups []*ingredientGroup + ingredients map[string]*Ingredient +} + +func newRootCommand(binaryName string) *cobra.Command { + cmd := &cobra.Command{ + Use: binaryName, + Short: "Frosting!", + Long: "CakeHappens/Frosting!", + Run: runHelp, + } + + return cmd +} + +func New(binaryName string) *ClientInfo { + return &ClientInfo{ + rootCommand: newRootCommand(binaryName), + ingredients: make(map[string]*Ingredient), + } +} + +func runHelp(cmd *cobra.Command, args []string) { + cmd.Help() +} + +func (c *ClientInfo) Group(header string, ingredients ...*Ingredient) { + grp := &ingredientGroup{ + header: header, + ingredients: ingredients, + } + + c.ingredientGroups = append(c.ingredientGroups, grp) + + for _, ing := range ingredients { + if _, ok := c.ingredients[ing.name]; ok { + panic(fmt.Errorf("ingredient with name already added: %s", ing.name)) + } + + c.ingredients[ing.name] = ing + } +} + +//func mergeIngredientMaps(ingredientMaps ...map[string]*Ingredient) (map[string]*Ingredient, error) { +// newMap := make(map[string]*Ingredient) +// +// for _, ingMap := range ingredientMaps { +// for name, ing := range ingMap { +// if _, ok := newMap[name]; ok { +// return nil, fmt.Errorf("ingredient with name already added: %s", name) +// } +// +// newMap[name] = ing +// } +// } +// +// return newMap, nil +//} + +func (c *ClientInfo) Execute(args ...string) { + ctx, cancel := context.WithCancel(context.Background()) + + runGroup := run.Group{} + { + cancelInterrupt := make(chan struct{}) + runGroup.Add( + createSignalWatcher(ctx, cancelInterrupt, cancel), + func(error) { + close(cancelInterrupt) + }) + } + { + runGroup.Add(func() error { + rootC := c.rootCommand + rootC.SetArgs(os.Args[1:]) + + cmdGroups := templates.CommandGroups{} + + //for ingGroup, cmds := range c.commandsPerIngredientGroup { + // rootC.AddCommand(cmds...) + // cmdGroups = append(cmdGroups, templates.CommandGroup{ + // Message: ingGroup.header, + // Commands: cmds, + // }) + //} + + // add all commands from the cmdGroups as subcommands to the root + cmdGroups.Add(rootC) + templates.ActsAsRootCommand(rootC, nil, cmdGroups...) + + return rootC.ExecuteContext(ctx) + }, func(error) { + cancel() + }) + } + + err := runGroup.Run() + if err != nil { + fmt.Fprintf(os.Stderr, "exit reason: %s\n", err) + os.Exit(1) + } + + color.New(color.FgGreen).Fprintln(os.Stderr, "Done!") +} + +// This function just sits and waits for ctrl-C +func createSignalWatcher(ctx context.Context, cancelInterruptChan <-chan struct{}, cancel context.CancelFunc) func() error { + return func() error { + c := make(chan os.Signal, 1) + + signal.Notify(c, syscall.SIGINT, syscall.SIGTERM) + select { + case sig := <-c: + err := errors.New(fmt.Sprintf("received signal %s", sig)) + fmt.Fprintf(os.Stderr, "%s\n", err) + signal.Stop(c) + cancel() + return err + case <-ctx.Done(): + return nil + case <-cancelInterruptChan: + return nil + } + } +} diff --git a/generators/generators.go b/generators/generators.go new file mode 100644 index 0000000..e8d7233 --- /dev/null +++ b/generators/generators.go @@ -0,0 +1,6 @@ +package generators + +import "github.com/cheekybits/genny/generic" + +// Item the type of the queue +type Item generic.Type diff --git a/generators/queue.go b/generators/queue.go new file mode 100644 index 0000000..d39c4f8 --- /dev/null +++ b/generators/queue.go @@ -0,0 +1,62 @@ +package generators + +//go:generate genny -pkg frosting -in queue.go -out ../ingredient_queue.go gen "Item=Ingredient" + +import ( + "sync" +) + +// ItemQueue the queue of Items +type ItemQueue struct { + items []*Item + lock sync.RWMutex +} + +// New creates a new ItemQueue +func NewItemQueue() *ItemQueue { + return &ItemQueue{ + items: []*Item{}, + } +} + +// Enqueue adds an Item to the end of the queue +func (s *ItemQueue) Enqueue(t *Item) { + s.lock.Lock() + defer s.lock.Unlock() + s.items = append(s.items, t) +} + +// Dequeue removes an Item from the start of the queue +func (s *ItemQueue) Dequeue() (*Item, bool) { + s.lock.Lock() + defer s.lock.Unlock() + + if len(s.items) > 0 { + item := s.items[0] + s.items = s.items[1:len(s.items)] + return item, true + } + + return nil, false +} + +// Front returns the item next in the queue, without removing it +func (s *ItemQueue) Front() *Item { + s.lock.RLock() + defer s.lock.RUnlock() + return s.items[0] +} + +// IsEmpty returns true if the queue is empty +func (s *ItemQueue) IsEmpty() bool { + s.lock.RLock() + defer s.lock.RUnlock() + return s.Length() == 0 +} + +// Size returns the number of Items in the queue +func (s *ItemQueue) Length() int { + s.lock.RLock() + defer s.lock.RUnlock() + return len(s.items) +} diff --git a/generators/set.go b/generators/set.go new file mode 100644 index 0000000..4135b84 --- /dev/null +++ b/generators/set.go @@ -0,0 +1,91 @@ +package generators + +//go:generate genny -pkg frosting -in set.go -out ../ingredient_set.go gen "Item=Ingredient" + +import ( + "sync" +) + +// ItemQueue the queue of Items +type ItemSet struct { + items map[*Item]bool + lock sync.RWMutex +} + +// New creates a new ItemQueue +func NewItemSet(items ...*Item) *ItemSet { + set := &ItemSet{ + items: make(map[*Item]bool), + } + + for _, item := range items { + set.items[item] = true + } + + return set +} + +// Enqueue adds an Item to the end of the queue +func (s *ItemSet) Add(t *Item) { + s.lock.Lock() + defer s.lock.Unlock() + s.items[t] = true +} + +// Dequeue removes an Item from the start of the queue +func (s *ItemSet) Remove(t *Item) { + s.lock.Lock() + defer s.lock.Unlock() + delete(s.items, t) +} + +func (s *ItemSet) Contains(t *Item) bool { + s.lock.RLock() + defer s.lock.RUnlock() + + return s.items[t] +} + +// Front returns the item next in the queue, without removing it +func (s *ItemSet) Cardinality() int { + s.lock.RLock() + defer s.lock.RUnlock() + return len(s.items) +} + +func (s *ItemSet) Items() []*Item { + s.lock.RLock() + defer s.lock.RUnlock() + + var itemList []*Item + for key, _ := range s.items { + itemList = append(itemList, key) + } + + return itemList +} + +// Set Difference: The relative complement or set difference of sets A and B, +// denoted A โ€“ B, is the set of all elements in A that are not in B. +// In set-builder notation, A โ€“ B = {x โˆˆ U : x โˆˆ A and x โˆ‰ B}= A โˆฉ B'. +func (s *ItemSet) Difference(other *ItemSet) *ItemSet { + s.lock.RLock() + defer s.lock.RUnlock() + + diff := NewItemSet() + + for key, _ := range s.items { + if !other.items[key] { + diff.items[key] = true + } + } + + return diff +} + +func (s *ItemSet) Clone() *ItemSet { + s.lock.RLock() + defer s.lock.RUnlock() + + return NewItemSet(s.Items()...) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..1875089 --- /dev/null +++ b/go.mod @@ -0,0 +1,17 @@ +module github.com/cakehappens/frosting + +go 1.14 + +require ( + github.com/brianvoe/gofakeit/v4 v4.3.0 + github.com/cheekybits/genny v1.0.0 + github.com/deckarep/golang-set v1.7.1 + github.com/fatih/color v1.9.0 + github.com/kr/pretty v0.1.0 + github.com/oklog/run v1.1.0 + github.com/spf13/cobra v0.0.7 + github.com/spf13/pflag v1.0.5 + github.com/stretchr/testify v1.5.1 + golang.org/x/net v0.0.0-20200226121028-0de0cce0169b // indirect + k8s.io/kubectl v0.18.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..31fcf99 --- /dev/null +++ b/go.sum @@ -0,0 +1,379 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8= +github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8= +github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= 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Ingredient struct { + name string + runFn RunFn + aliases []string + short string + long string + example string + dependencies []*Ingredient + flagsFn func(flagSet *flag.FlagSet) + ran bool +} + +func (ing *Ingredient) Name() string { + return ing.name +} + +func WithAliases(aliases ...string) IngredientOption { + return func(ing *Ingredient) { + ing.aliases = append(ing.aliases, aliases...) + } +} + +func WithHelpDescriptions(short, long string) IngredientOption { + return func(ing *Ingredient) { + ing.short = short + ing.long = long + } +} + +func WithExampleHelp(example string) IngredientOption { + return func(ing *Ingredient) { + ing.example = example + } +} + +func WithDependencies(deps ...*Ingredient) IngredientOption { + return func(ing *Ingredient) { + ing.dependencies = deps + } +} + +func WithFlags(fn func(set *flag.FlagSet)) IngredientOption { + return func(ing *Ingredient) { + ing.flagsFn = fn + } +} + +func MustNewIngredient(name string, runFn RunFn, opts ...IngredientOption) *Ingredient { + ing := &Ingredient{ + name: name, + runFn: runFn, + } + + for _, o := range opts { + o(ing) + } + + return ing +} + +type ingredientGroup struct { + header string + ingredients []*Ingredient +} diff --git a/ingredient_queue.go b/ingredient_queue.go new file mode 100644 index 0000000..76482f3 --- /dev/null +++ b/ingredient_queue.go @@ -0,0 +1,62 @@ +// This file was automatically generated by genny. +// Any changes will be lost if this file is regenerated. +// see https://github.com/cheekybits/genny + +package frosting + +import "sync" + +// IngredientQueue the queue of Ingredients +type IngredientQueue struct { + items []*Ingredient + lock sync.RWMutex +} + +// New creates a new IngredientQueue +func NewIngredientQueue() *IngredientQueue { + return &IngredientQueue{ + items: []*Ingredient{}, + } +} + +// Enqueue adds an Ingredient to the end of the queue +func (s *IngredientQueue) Enqueue(t *Ingredient) { + s.lock.Lock() + defer s.lock.Unlock() + s.items = append(s.items, t) +} + +// Dequeue removes an Ingredient from the start of the queue +func (s *IngredientQueue) Dequeue() (*Ingredient, bool) { + s.lock.Lock() + defer s.lock.Unlock() + + if len(s.items) > 0 { + item := s.items[0] + s.items = s.items[1:len(s.items)] + return item, true + } + + return nil, false +} + +// Front returns the item next in the queue, without removing it +func (s *IngredientQueue) Front() *Ingredient { + s.lock.RLock() + defer s.lock.RUnlock() + return s.items[0] +} + +// IsEmpty returns true if the queue is empty +func (s *IngredientQueue) IsEmpty() bool { + s.lock.RLock() + defer s.lock.RUnlock() + return s.Length() == 0 +} + +// Size returns the number of Ingredients in the queue +func (s *IngredientQueue) Length() int { + s.lock.RLock() + defer s.lock.RUnlock() + return len(s.items) +} diff --git a/ingredient_set.go b/ingredient_set.go new file mode 100644 index 0000000..37f669c --- /dev/null +++ b/ingredient_set.go @@ -0,0 +1,91 @@ +// This file was automatically generated by genny. +// Any changes will be lost if this file is regenerated. +// see https://github.com/cheekybits/genny + +package frosting + +import "sync" + +// IngredientQueue the queue of Ingredients +type IngredientSet struct { + items map[*Ingredient]bool + lock sync.RWMutex +} + +// New creates a new IngredientQueue +func NewIngredientSet(items ...*Ingredient) *IngredientSet { + set := &IngredientSet{ + items: make(map[*Ingredient]bool), + } + + for _, item := range items { + set.items[item] = true + } + + return set +} + +// Enqueue adds an Ingredient to the end of the queue +func (s *IngredientSet) Add(t *Ingredient) { + s.lock.Lock() + defer s.lock.Unlock() + s.items[t] = true +} + +// Dequeue removes an Ingredient from the start of the queue +func (s *IngredientSet) Remove(t *Ingredient) { + s.lock.Lock() + defer s.lock.Unlock() + delete(s.items, t) +} + +func (s *IngredientSet) Contains(t *Ingredient) bool { + s.lock.RLock() + defer s.lock.RUnlock() + + return s.items[t] +} + +// Front returns the item next in the queue, without removing it +func (s *IngredientSet) Cardinality() int { + s.lock.RLock() + defer s.lock.RUnlock() + return len(s.items) +} + +func (s *IngredientSet) Ingredients() []*Ingredient { + s.lock.RLock() + defer s.lock.RUnlock() + + var itemList []*Ingredient + for key, _ := range s.items { + itemList = append(itemList, key) + } + + return itemList +} + +// Set Difference: The relative complement or set difference of sets A and B, +// denoted A โ€“ B, is the set of all elements in A that are not in B. +// In set-builder notation, A โ€“ B = {x โˆˆ U : x โˆˆ A and x โˆ‰ B}= A โˆฉ B'. +func (s *IngredientSet) Difference(other *IngredientSet) *IngredientSet { + s.lock.RLock() + defer s.lock.RUnlock() + + diff := NewIngredientSet() + + for key, _ := range s.items { + if !other.items[key] { + diff.items[key] = true + } + } + + return diff +} + +func (s *IngredientSet) Clone() *IngredientSet { + s.lock.RLock() + defer s.lock.RUnlock() + + return NewIngredientSet(s.Ingredients()...) +} diff --git a/resolver.go b/resolver.go new file mode 100644 index 0000000..1edb258 --- /dev/null +++ b/resolver.go @@ -0,0 +1,141 @@ +package frosting + +import ( + "errors" + "fmt" +) + +type DependencyResolver interface { + Ready() int + Dequeue() (*Ingredient, bool) + Length() int + NotifyComplete(ingredient *Ingredient) +} + +type defaultDependencyResolver struct { + ingredients map[string]*Ingredient + // values are those dependents of the key + dependentsGraph map[*Ingredient]*IngredientSet + // values are those parents of the key + parentsGraph map[*Ingredient]*IngredientSet + unready *IngredientSet + inflight *IngredientSet + ready *IngredientQueue +} + +func newDefaultDependencyResolver() *defaultDependencyResolver { + return &defaultDependencyResolver{ + ingredients: make(map[string]*Ingredient), + dependentsGraph: make(map[*Ingredient]*IngredientSet), + parentsGraph: make(map[*Ingredient]*IngredientSet), + ready: NewIngredientQueue(), + unready: NewIngredientSet(), + inflight: NewIngredientSet(), + } +} + +func (r *defaultDependencyResolver) Load(ingredients map[string]*Ingredient) error { + // we'll use a temporary map to check for circular dependencies + tmpIngredientDependencies := make(map[*Ingredient]*IngredientSet) + for _, node := range ingredients { + r.ingredients[node.name] = node + + dependencySet := NewIngredientSet() + for _, dep := range node.dependencies { + dependencySet.Add(dep) + if parentSet, ok := r.parentsGraph[dep]; ok { + parentSet.Add(node) + } else { + r.parentsGraph[dep] = NewIngredientSet(node) + } + } + r.dependentsGraph[node] = dependencySet + tmpIngredientDependencies[node] = dependencySet.Clone() + + if len(node.dependencies) == 0 { + r.ready.Enqueue(node) + } else { + r.unready.Add(node) + } + } + + // check for circular dependency + for len(tmpIngredientDependencies) != 0 { + // readyset type is *Ingredient + readySet := NewIngredientSet() + for ing, deps := range tmpIngredientDependencies { + if deps.Cardinality() == 0 { + readySet.Add(ingredients[ing.name]) + } + } + + if readySet.Cardinality() == 0 { + return errors.New("circular dependency found in ingredients") + } + + for _, ing := range readySet.Ingredients() { + delete(tmpIngredientDependencies, ing) + } + + for parent, deps := range tmpIngredientDependencies { + diff := deps.Difference(readySet) + tmpIngredientDependencies[parent] = diff + } + } + + return nil +} + +func (r *defaultDependencyResolver) Ready() int { + return r.ready.Length() +} + +func (r *defaultDependencyResolver) Dequeue() (*Ingredient, bool) { + // remove item from ready queue + val, ok := r.ready.Dequeue() + if !ok { + return nil, false + } + // remove item from unready + r.unready.Remove(val) + + // add item to inflight + r.inflight.Add(val) + + return val, true +} + +// Length returns number of items that are left to be completed +// Items can be in a state of ready, unready or inflight +// Once marked as complete via NotifyComplete +// they are no longer tracked +func (r *defaultDependencyResolver) Length() int { + return r.ready.Length() + r.unready.Cardinality() + r.inflight.Cardinality() +} + +// whenever a node is marked complete, we can look at that nodes that depend on it (parent) +// and check if there are any other dependencies for not yet satisfied +// if there are no dependencies for that parent, add that node to the ready set +func (r *defaultDependencyResolver) NotifyComplete(ingredient *Ingredient) error { + // remove item from inflight + if !r.inflight.Contains(ingredient) { + return fmt.Errorf("tried to notify completion of an ingredient not in-flight: %s", ingredient.name) + } + r.inflight.Remove(ingredient) + + if parents, ok := r.parentsGraph[ingredient]; ok { + for _, p := range parents.Ingredients() { + if !r.dependentsGraph[p].Contains(ingredient) { + return fmt.Errorf("something went horribly wrong. Dependent or Parent Graph is malformed. Tried to remove ingredient from parent dependencies") + } + r.dependentsGraph[p].Remove(ingredient) + + if r.dependentsGraph[p].Cardinality() == 0 { + r.ready.Enqueue(p) + r.unready.Remove(p) + } + } + } + + return nil +} diff --git a/resolver_test.go b/resolver_test.go new file mode 100644 index 0000000..b485cd7 --- /dev/null +++ b/resolver_test.go @@ -0,0 +1,455 @@ +package frosting + +import ( + gofakeit "github.com/brianvoe/gofakeit/v4" + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" + "testing" +) + +func init() { + gofakeit.Seed(0) +} + +func Test_defaultDependencyResolver_Dequeue(t *testing.T) { + type testData struct { + name string + arrange func(r *defaultDependencyResolver) + preassert func(t *testing.T, r *defaultDependencyResolver) + assert func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) + } + + tests := []testData{ + { + name: "when ready is empty, return nil, false", + arrange: func(r *defaultDependencyResolver) {}, + preassert: func(t *testing.T, r *defaultDependencyResolver) {}, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + assert.Nil(t, ing, "there should be no ready ingredients") + assert.False(t, ok, "no ingredient was returned") + }, + }, + func() testData { + const name = "when ready has 1 item, return item, true" + + expectedIngredient := &Ingredient{name: gofakeit.Word()} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[expectedIngredient.name] = expectedIngredient + r.ready.Enqueue(expectedIngredient) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) {}, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + if assert.NotNil(t, ing, "because there an ingredient ready") { + assert.Equal(t, expectedIngredient, ing) + } + + assert.True(t, ok, "because an ingredient was returned") + }, + } + }(), + func() testData { + const name = "when ready has multiple items, return item, true" + + expectedIngredient := &Ingredient{name: "a"} + ing2 := &Ingredient{name: "b"} + ing3 := &Ingredient{name: "c"} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[expectedIngredient.name] = expectedIngredient + r.ingredients[ing2.name] = ing2 + r.ingredients[ing3.name] = ing3 + + r.ready.Enqueue(expectedIngredient) + r.ready.Enqueue(ing2) + r.ready.Enqueue(ing3) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) {}, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + if assert.NotNil(t, ing, "because there an ingredient ready") { + assert.Equal(t, expectedIngredient, ing) + } + + assert.True(t, ok, "because an ingredient was returned") + }, + } + }(), + func() testData { + const name = "when there are ingredients but none of them are ready, returns nil, false" + + ing1 := &Ingredient{name: "a"} + ing2 := &Ingredient{name: "b"} + ing3 := &Ingredient{name: "c"} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[ing1.name] = ing1 + r.ingredients[ing2.name] = ing2 + r.ingredients[ing3.name] = ing3 + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) {}, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + assert.Nil(t, ing, "because there are no ingredients ready") + assert.False(t, ok, "because no ingredient was returned") + }, + } + }(), + func() testData { + const name = "dequeued item is removed from ready" + + ing1 := &Ingredient{name: "a"} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[ing1.name] = ing1 + r.ready.Enqueue(ing1) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) { + assert.Equal(t, 1, r.ready.Length(), "because item was enqueued") + }, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + assert.True(t, r.ready.IsEmpty(), "because item was dequeued") + }, + } + }(), + func() testData { + const name = "dequeued item is added to inflight" + + ing1 := &Ingredient{name: "a"} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[ing1.name] = ing1 + r.ready.Enqueue(ing1) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) { + assert.Equal(t, 0, r.inflight.Cardinality(), "because nothing has been dequeued") + }, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + if assert.Equal(t, 1, r.inflight.Cardinality(), "because item was dequeued") { + assert.Contains(t, r.inflight.Ingredients(), ing1) + } + }, + } + }(), + func() testData { + const name = "dequeued item is removed from unready" + + ing1 := &Ingredient{name: "a"} + + return testData{ + name: name, + arrange: func(r *defaultDependencyResolver) { + r.ingredients[ing1.name] = ing1 + r.unready.Add(ing1) + r.ready.Enqueue(ing1) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) { + assert.Equal(t, 1, r.unready.Cardinality(), "because ingredient started as unready") + }, + assert: func(t *testing.T, r *defaultDependencyResolver, ing *Ingredient, ok bool) { + assert.Equal(t, 0, r.unready.Cardinality(), "because item transitioned to inflight") + }, + } + }(), + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + r := newDefaultDependencyResolver() + tt.arrange(r) + tt.preassert(t, r) + got1, got2 := r.Dequeue() + tt.assert(t, r, got1, got2) + }) + } +} + +func Test_defaultDependencyResolver_Length(t *testing.T) { + type testData struct { + name string + arrange func(r *defaultDependencyResolver) + preassert func(t *testing.T, r *defaultDependencyResolver) + assert func(t *testing.T, r *defaultDependencyResolver, got int) + } + + tests := []testData{ + func() testData { + return testData{ + name: "when everything is empty, returns 0", + arrange: func(r *defaultDependencyResolver) { + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) { + }, + assert: func(t *testing.T, r *defaultDependencyResolver, got int) { + assert.Equal(t, 0, got, "because everything is empty") + }, + } + }(), + func() testData { + return testData{ + name: "sums ready, unready, and inflight", + arrange: func(r *defaultDependencyResolver) { + a := &Ingredient{name: "a"} + b := &Ingredient{name: "b"} + c := &Ingredient{name: "c"} + d := &Ingredient{name: "d"} + e := &Ingredient{name: "e"} + f := &Ingredient{name: "f"} + g := &Ingredient{name: "g"} + h := &Ingredient{name: "h"} + i := &Ingredient{name: "i"} + + r.unready.Add(a) + r.inflight.Add(b) + r.inflight.Add(c) + r.inflight.Add(d) + r.ready.Enqueue(e) + r.ready.Enqueue(f) + r.ready.Enqueue(g) + r.ready.Enqueue(h) + r.ready.Enqueue(i) + }, + preassert: func(t *testing.T, r *defaultDependencyResolver) { + + }, + assert: func(t *testing.T, r *defaultDependencyResolver, got int) { + assert.Equal(t, 9, got, "because there is 1 unready + 3 inflight + 5 ready") + }, + } + }(), + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + r := newDefaultDependencyResolver() + tt.arrange(r) + tt.preassert(t, r) + got := r.Length() + tt.assert(t, r, got) + }) + } +} + +func Test_defaultDependencyResolver_NotifyComplete(t *testing.T) { + type testData struct { + name string + args *Ingredient + arrange func(r *defaultDependencyResolver) + preassert func(t *testing.T, r *defaultDependencyResolver) + assert func(t *testing.T, r *defaultDependencyResolver) + } + + //assert := assert.New(t) + + tests := []testData{ + //func() testData { + // return testData{ + // name: "", + // } + //}(), + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + r := newDefaultDependencyResolver() + tt.arrange(r) + tt.preassert(t, r) + r.NotifyComplete(tt.args) + tt.assert(t, r) + }) + } +} + +func Test_defaultDependencyResolver_Load(t *testing.T) { + type testData struct { + name string + args map[string]*Ingredient + arrange func(r *defaultDependencyResolver) + preassert func(t *testing.T, r *defaultDependencyResolver) + assert func(t *testing.T, r *defaultDependencyResolver, got error) + } + + tests := []testData{ + //func() testData { + // return testData{} + //}(), + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + r := newDefaultDependencyResolver() + tt.arrange(r) + tt.preassert(t, r) + err := r.Load(tt.args) + tt.assert(t, r, err) + }) + } +} + +func Test_defaultDependencyResolver_AcceptanceTests(t *testing.T) { + t.Run("single ingredient scenario", func(t *testing.T) { + require := require.New(t) + + input := make(map[string]*Ingredient) + ing := &Ingredient{name: "a"} + input[ing.name] = ing + + r := newDefaultDependencyResolver() + + err := r.Load(input) + require.NoError(err, "because there should be no circular dependency") + require.Equal(1, r.Length(), "because one ingredient has been loaded") + + val, ok := r.Dequeue() + + require.Equal(ing, val, "because single ingredient dequeued") + require.True(ok, "because ingredient was returned") + + require.Equal(1, r.Length(), "because one ingredient is in flight") + + r.NotifyComplete(val) + + require.Equal(0, r.Length(), "because one ingredient has completed") + }) + + t.Run("single ingredient depends on self", func(t *testing.T) { + input := make(map[string]*Ingredient) + ing := &Ingredient{name: "a"} + ing.dependencies = append(ing.dependencies, ing) + input[ing.name] = ing + + r := newDefaultDependencyResolver() + + err := r.Load(input) + require.Error(t, err, "because there is a circular dependency") + }) + + t.Run("ingredient circle (circular dependency)", func(t *testing.T) { + input := make(map[string]*Ingredient) + + ingA := &Ingredient{name: "a"} + input[ingA.name] = ingA + + ingB := &Ingredient{name: "b"} + input[ingB.name] = ingB + + ingC := &Ingredient{name: "c"} + input[ingC.name] = ingC + + // A -> B + ingA.dependencies = append(ingA.dependencies, ingB) + + // B -> C + ingB.dependencies = append(ingB.dependencies, ingC) + + // C -> A + ingC.dependencies = append(ingC.dependencies, ingA) + + r := newDefaultDependencyResolver() + + err := r.Load(input) + require.Error(t, err, "because there is a circular dependency") + }) + + t.Run("ingredients tree with circular dependency", func(t *testing.T) { + input := make(map[string]*Ingredient) + + ingA := &Ingredient{name: "a"} + input[ingA.name] = ingA + + ingB := &Ingredient{name: "b"} + input[ingB.name] = ingB + + ingC := &Ingredient{name: "c"} + input[ingC.name] = ingC + + // A -> B + ingA.dependencies = append(ingA.dependencies, ingB) + + // A -> C + ingA.dependencies = append(ingA.dependencies, ingC) + + // C -> A + ingC.dependencies = append(ingC.dependencies, ingA) + + r := newDefaultDependencyResolver() + + err := r.Load(input) + require.Error(t, err, "because there is a circular dependency") + }) + + t.Run("ingredients tree, can dequeue multiple ready", func(t *testing.T) { + require := require.New(t) + + input := make(map[string]*Ingredient) + + ingA := &Ingredient{name: "a"} + input[ingA.name] = ingA + + ingB := &Ingredient{name: "b"} + input[ingB.name] = ingB + + ingC := &Ingredient{name: "c"} + input[ingC.name] = ingC + + // A -> B + // A -> C + ingA.dependencies = append(ingA.dependencies, []*Ingredient{ingB, ingC}...) + + r := newDefaultDependencyResolver() + + err := r.Load(input) + total := len(input) + require.Equal(3, total, "because we have 3 ingredients") + require.Equal(total, r.Length(), "because we have 3 ingredients") + numCompleted := 0 + + require.NoError(err, "because there should be no circular dependency") + require.Equal(total, r.Length(), "because %d ingredients have been loaded", total) + + require.Equal(2, r.Ready(), "because b & c are without dependencies") + + val1, ok := r.Dequeue() + require.True(ok, "because the dequeue should be successful") + require.NotEqual(ingA, val1, "because the first dequeue should be either b or c") + + val2, ok := r.Dequeue() + require.True(ok, "because the dequeue should be successful") + require.NotEqual(ingA, val1, "because the second dequeue should be either b or c") + + require.NotEqual(val1, val2, "because only b and c should have been dequeued") + + require.Equal(total, r.Length(), "because nothing has been completed", total) + + err = r.NotifyComplete(val1) + require.NoError(err, "because the ingredient should be in-flight") + numCompleted += 1 + + require.Equal(total-numCompleted, r.Length(), "because %d ingredients have been completed", numCompleted) + + _, ok = r.Dequeue() + require.False(ok, "because 'a' still has an incomplete dependency") + + err = r.NotifyComplete(val2) + require.NoError(err, "because the ingredient should be in-flight") + numCompleted += 1 + + require.Equal(total-numCompleted, r.Length(), "because %d ingredients have been completed", numCompleted) + + val3, ok := r.Dequeue() + require.True(ok, "because the dequeue should be successful") + require.Equal(ingA, val3, "because 'a' should have been returned") + + err = r.NotifyComplete(val3) + require.NoError(err, "because the ingredient should be in-flight") + numCompleted += 1 + + require.Equal(total-numCompleted, r.Length(), "because %d ingredients have been completed", numCompleted) + + require.Equal(0, r.Length(), "because all ingredients have completed") + }) +} diff --git a/sh/shell.go b/sh/shell.go new file mode 100644 index 0000000..e82e294 --- /dev/null +++ b/sh/shell.go @@ -0,0 +1,138 @@ +package sh + +import ( + "context" + "fmt" + "io" + "os" + "os/exec" + "strings" +) + +type Waiter func(cmd *exec.Cmd, stdout, stderr io.ReadCloser, stdin io.WriteCloser) error + +type WritePipeHandler func(writer io.WriteCloser) error + +type ReadPipeHandler func(reader io.ReadCloser) error + +// For use when y +type MultiReadPipeHandler func(readers ...io.ReadCloser) error + +type RunOptions struct { + Args []string + Env map[string]string + Waiter Waiter +} + +type OptionFn func(opts *RunOptions) + +// Merges os.Environment variables to Env map passed to command +func OptionWithOsEnv(opts *RunOptions) error { + for _, item := range os.Environ() { + split := strings.SplitN(item, "=", 2) + opts.Env[split[0]] = split[1] + } + return nil +} + +// Run provides an easy to use API on top of RunLow +// By default, nothing is done to stdout, stderr, stdin +// so if you want to consume them, you must bind to them using Waiter func +// If Waiter remains unset, it defaults to cmd.Wait() +func Run(ctx context.Context, cmd string, options ...OptionFn) error { + runOpts := &RunOptions{} + + for _, optFn := range options { + optFn(runOpts) + } + + if runOpts.Waiter == nil { + runOpts.Waiter = func(cmd *exec.Cmd, stdout, stderr io.ReadCloser, stdin io.WriteCloser) error { + return cmd.Wait() + } + } + + if runOpts.Env == nil { + runOpts.Env = make(map[string]string) + } + + if runOpts.Args == nil { + runOpts.Args = make([]string, 0) + } + + cmdEnv := make([]string, len(runOpts.Env)) + + for k, v := range runOpts.Env { + cmdEnv = append(cmdEnv, fmt.Sprintf("%s=%s", k, v)) + } + + code, err, ran := RunLow(ctx, cmdEnv, runOpts.Waiter, cmd, runOpts.Args...) + + if !ran { + return fmt.Errorf("command failed to run: %w", err) + } + + if err != nil { + return fmt.Errorf("command failed with status code %d: %w", code, err) + } + + return nil +} + +// Run is the lowest level function to execute an external command +// since this function uses cmd.Start, it does not natively block +// you must provide that functionality +// No environment variables are explicitly passed to the command besides those provided +// Environment variables provided must be in the form of KEY=VALUE +func RunLow( + ctx context.Context, + env []string, + waiter Waiter, + cmd string, + args ...string, + ) (code int, err error, ran bool) { + + c := exec.CommandContext(ctx, cmd, args...) + c.Env = env + + stdOutPipe, err := c.StdoutPipe() + if err != nil { + return -1, fmt.Errorf("could not create stdout pipe for cmd: %w", err), false + } + + stdErrPipe, err := c.StderrPipe() + if err != nil { + return -1, fmt.Errorf("could not create stderr pipe for cmd: %w", err), false + } + + stdInPipe, err := c.StdinPipe() + if err != nil { + return -1, fmt.Errorf("could not create stdin pipe for cmd: %w", err), false + } + + err = c.Start() + if err != nil { + return -1, err, false + } + + done := make(chan struct{}) + go func() { + + done <- struct{}{} + }() + <-done + + c.Wait() + + err = waiter(c, stdOutPipe, stdErrPipe, stdInPipe) + + if err == nil { + return 0, nil, true + } + + if err, ok := err.(*exec.ExitError); ok { + return err.ExitCode(), err, true + } + + return -1, err, false +} diff --git a/test/helpers.go b/test/helpers.go new file mode 100644 index 0000000..ba296bf --- /dev/null +++ b/test/helpers.go @@ -0,0 +1,4 @@ +// This contains some test helpers to +// help you be confident you are shipping +// quality ingredients +package test diff --git a/test/helpers_test.go b/test/helpers_test.go new file mode 100644 index 0000000..56e5404 --- /dev/null +++ b/test/helpers_test.go @@ -0,0 +1 @@ +package test