A reflection based dependency injection toolkit for Go.


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A reflection based dependency injection toolkit for Go.

Good for:

  • Powering an application framework, e.g. Fx.
  • Resolving the object graph during process startup.

Bad for:

  • Using in place of an application framework, e.g. Fx.
  • Resolving dependencies after the process has already started.
  • Exposing to user-land code as a Service Locator.


We recommend consuming SemVer major version 1 using your dependency manager of choice.

$ glide get 'go.uber.org/dig#^1'
$ dep ensure -add "go.uber.org/[email protected]"
$ go get 'go.uber.org/[email protected]'


This library is v1 and follows SemVer strictly.

No breaking changes will be made to exported APIs before v2.0.0.

  • Allow to specify an interface when providing a constructor

    Allow to specify an interface when providing a constructor

    Update (by @glibsm)

    The addition of dig.As ProvideOption has been agreed on.

    Currently dig only uses a constructors that returns exactly what the function expects.

    If the function accepts an interface, and we don't inject the constructor that returns that interface we get this error

    panic: missing dependencies for function "main".main.func1 (..../main.go:29): type main.Fooer is not in the container, did you mean to use *main.Foo?

    Take the following example

    type Foo struct{}
    func NewFoo() *Foo {
    	return &Foo{}
    func (b *Foo) Hello() {
    type Fooer interface {
    func main() {
    	di := dig.New()
    	err := di.Provide(NewFoo)
    	if err != nil {
    	err = di.Invoke(func(f Fooer) {
    		fmt.Printf("f: %+v", f)
    	if err != nil {

    So to make it work it needs to have a constructor function such as:

    func NewFoo() Fooer {
    	return &Foo{}

    ~which is basically making us declare that Foo implements Fooer~ ~Would it be feasible to change the library so that it can workout itself if the struct implements the interface?~ [edit] as clarified in the comments this suggestion won't work

    Or alternatively, add a new ProvideOption which allow us to specify which concrete implementation to inject for a given interface?

    opened by alessandrozucca 25
  • Does not work with go.mod / vgo

    Does not work with go.mod / vgo

    Just import go.uber.org/dig to any go.mod enabled project and then run vgo mod -sync

    import "go.uber.org/dig" ->
    import "go.uber.org/dig/internal/digreflect" ->
    test ->
    import "go.uber.org/dig/internal/digreflect/tests/myrepository.git" ->
    import "mydependency": cannot find module providing package mydependency
    opened by albenik 23
  • Allow

    Allow "fan-in" for named types in dig graph

    I've been talking to @abhinav about this, In order to support use cases where a dig parameter depends on multiple inputs of the same type we need the ability to aggregate dig types together.

    So if we have the following outputs:

      Output1 MyType `name:"output1"`
      Output2 MyType `name:"output2"`

    I'd want to be able to grab all the "MyType"s in a single attribute.


    1: Add another tag to indicate that the type should be a fan-in collection:

    type In struct {
      Outputs map[string]MyType `collection:"true"` // tag name TBD

    The string key in the Outputs variable will be the name of the attributes that were injected into the graph.

    2: Add a dig.Key (or similar) type for map keys. Any map of these types will be recognized as a fan-in collection.

    type In struct {
      Outputs map[dig.Key]MyType

    The dig.Key would be a dig struct where we could embed information on the type. Currently that would only be the "name", but we could add more information later.

    Use cases

    YARPC Middleware

    Currently we don't have a good answer for middleware to ensure that we can take multiple middleware inputs and effectively construct a middleware graph without forcing the yarpcfx module to have a hard dependency on every middleware library (which gets out of control). With this system we'd be able to grab all middleware that was inserted into the graph. Since this is a map, the yarpcfx module would need to have an ordered list of middleware names it was expecting beforehand (all names should be optional) and it can construct the middleware chain itself. Of course this would only support names that yarpcfx explicitly expects, but that is necessary for the middleware ordering.

    YARPC Specs:

    The yarpc config options allow inserting custom Transport/PeerList/Updater specs into the yarpc config builder. Having support for this would allow us to detach the yarpc fx module from the implementations of each transport. For instance, a user could inject a "grpcfx" module into the graph which provided a "TransportSpec" for grpc that integrated seamlessly into the yarpc configuration.

    opened by willhug 22
  • Add SkipAcyclicVerification Option, and container.VerifyAcyclic

    Add SkipAcyclicVerification Option, and container.VerifyAcyclic

    It is not unreasonable for libraries using dig under the hood for dependency graph management to c.Provide constructors in a tight loop. Rather than paying the cost of of verifying the graph is acyclic for every Provide, this option and method combination can be used to verify the graph once, after the loop has completed.

    opened by dnathe4th 18
  • [WIP] Sub graphs and Decorate

    [WIP] Sub graphs and Decorate


    Also address #230

    Added support for creating child containers.

    • [x] Containers have access to all types provided using their parents (Invoke works anywhere)
    • [x] Containers have access to all types provided using their children (Invoke works anywhere)
    • [x] Provide checks the entire graph (all containers both up and down) for duplicates
    • [x] All success tests repeated for children
    • [x] Tests for multiple and multi level children
    • [x] Test for duplicate check in one of the children
    • [x] Stringer updated
    opened by srikrsna 16
  • dig.Param: Recurse into nested parameter objects

    dig.Param: Recurse into nested parameter objects

    This change adds support to parameter objects for recursing into fields that are also parameter objects. That is, this change allows the following,

    type OutputConfig struct {
        Writer io.Writer
    type Config struct {
        Input io.Reader
        Output OutputConfig
    func NewTransport(cfg Config) (*Transport, error) { .. }

    Besides the usefulness of treating fields similar to constructor parameters, there's another motivating use case for this: Aliasing dig.Param. Without this change, we have special handling for the dig.Param type, opting it out of resolution from dig. If a library author wants to use their own type in place of dig.Param (for example, fx.Param), they can't quite do this because any alias of dig.Param is a different type; one which the library does not special-case.

    package fx
    type Param dig.Param
    type Config struct {
        Input io.Reader
    // The above with fail because dig doesn't know how to resolve fx.Param.

    With this change, Fx will be able to support the following.

    package fx
    type Param struct{ dig.Param }
    type Config struct {
        // ..
    opened by abhinav 14
  • Add dig.Optional for marking optional params

    Add dig.Optional for marking optional params

    Realized that fx can be improved so certain parameters provided, while in their absence, a default parameter value would be used.

    Add a new dig.Optional type that can be embedded in structs to mark that the dependency on them is optional.

    opened by orishu 13
  • [Prototype] Zero-value validation approach

    [Prototype] Zero-value validation approach

    Currently dig returns an error dependency of type is not registered if constructor argument fails to resolve during Invoke or Resolve. This change is introduced to resolve any absent arguments with zero value objects. Zero value objects are resolved during resolving constructor or invoking a function with arguments not yet present in the DIG container.

    When can it happen?

    1. Constructors are provided out of order
    2. Optional objects are not provided to the constructor

    What will be the expected behavior?

    1. No change in existing API on the container
    2. Invoke, resolving constructor never fails on missing constructor arguments in DIG container.
    3. Constructor is provided with zero value argument during call to continue execution
    4. Invoke/Resolve logs error message when zero value object is used
    5. Zero value object is never cached.
    opened by anuptalwalkar 12
  • Invoke on provided/unprovided ctors

    Invoke on provided/unprovided ctors

    Calling Invoke on provided and unprovided funcs can result in executing constructors more than once and overwriting the graph with the resulted return objects. for provided constructors -

    ctor1(a *A, b *B) (x *x)
    ctor2() (a *A)

    Invoking constructors in order will result in ctor1 resolving *A and *B. Invoking ctor2 will result in resolving *A again.

    enhancement discussion 
    opened by anuptalwalkar 12
  •  Combine Resolve, ResolveAll, and Invoke into a Locate func

    Combine Resolve, ResolveAll, and Invoke into a Locate func

    When you ask the container to resolve dependencies, that is called the "service locator" pattern.

    Combining Resolve, ResolveAll, and Invoke into a Locate func will streamline the experience:

    // locate 1 or more types
    var logger *zap.Logger
    var dispatcher *yarpc.Dispatcher
    container.Locate(&logger, &dispatcher)
    // same as above, using a func
    container.Locate(func(logger *zap.Logger, dispatcher *yarpc.Dispatcher) {

    This has the benefit of:

    • Being more specific, giving a nod to the pattern actually being used here
    • Reduces API surface and simplifies using DIG
    opened by GoodWriteHQ 12
  • [2/2] Fix end-to-end behavior tests

    [2/2] Fix end-to-end behavior tests

    ☮️ 🙏 😇 🙇 I come in peace :bow:😇 🙏 ☮️

    See #70 for context.

    This PR follows up on the previous test-only diff. It removes all pre-existing tests, fixes the integration tests, and finally removes all features not required to make the end-to-end tests pass. Along the way, it does some fairly significant refactoring.

    Most importantly, it combines the internal graph package and the top-level dig package into a single package. Since Container and Graph are basically the same thing, this simplifies the code a fair bit without expanding the exported API at all. More importantly, it lets us improve overall code coverage with just the end-to-end tests:

    $ go test -cover .
    ok      go.uber.org/dig 0.010s  coverage: 91.1% of statements

    This gives us the freedom to refactor and add features aggressively, since we're only testing important user-facing APIs.

    Features removed (at least for now):

    • Container.Resolve: Fx doesn't need it and we don't want users interacting with dig directly, so it can go.
    • Container.Invoke: now only runs the supplied function. It doesn't provide any dependencies. (We can always add that back if necessary, but I like the clean separation between providing deps and triggering side effects.)

    Features added:

    • Consistent support for scalars, structs, functions (with caveats noted in the tests), and channels.

    All the end-to-end tests pass now.

    opened by akshayjshah 11
  • dig

    dig "trace" mode

    Currently, we don't get any visibility into the types injected in the DI container of Dig. i.e. it's not really possible to see which constructors' provided types are the "most used" and where the "hot path"s are. Note that what I mean by "hot path" here isn't code that's executed frequently - each constructor in Dig is invoked precisely once. The "hot path" here is the constructor where the most of the graph depends on.

    Also this may be useful for identifying types that are provided but aren't really used anywhere, which may help users identify some dead code, or break down constructors that aren't used frequently, etc.

    opened by sywhang 0
  • Allow dig.As with dig.Group

    Allow dig.As with dig.Group

    Hello there!

    Why I can't use dig.As with dig.Group provide option?

    It would be better if I can write:

    d.Provide(NewCleanService, dig.Group("cron_job"), dig.As(new(cron.Command)))

    instead of:

    d.Provide(func(service *CleanService) cron.Command { return service }, dig.Group("cron_job")))
    enhancement help wanted 
    opened by Terminator637 1
  • dig.In help

    dig.In help

    package main
    import (
    type Animal interface {
    type Dog struct {
    	Name string
    // NewDog dig provider
    func NewDog() *Dog {
    	println("new dog")
    	return &Dog{
    		Name: "xiaohei",
    func (d *Dog) Say() {
    	fmt.Printf("%s say\n", d.Name)
    type Cat struct {
    	Name string
    func (c *Cat) Say() {
    	fmt.Printf("%s say\n", c.Name)
    // NewCat dig provider
    func NewCat() *Cat {
    	println("new cat")
    	return &Cat{
    		Name: "xiaohong",
    type Zoo struct {
    	BlackDog *Dog
    	RedCat   *Cat
    type injector struct {
    	BlackDog *Dog `name:"dog"`
    	RedCat   *Cat `name:"cat"`
    func NewZoo(inj injector) *Zoo {
    	println("new zoo")
    	return &Zoo{
    		BlackDog: inj.BlackDog,
    		RedCat:   inj.RedCat,
    func main() {
    	container := dig.New()
    	container.Provide(NewDog, dig.Name("dog"))
    	container.Provide(NewCat, dig.Name("cat"))
    	container.Invoke(func(z *Zoo) {

    As above, I must create injector struct as param to NewZoo. How can I simplify it.Like this

    type Zoo struct {
    	BlackDog *Dog `name:"dog"`
    	RedCat   *Cat `name:"cat"`
    //type injector struct {
    //	dig.In
    //	BlackDog *Dog `name:"dog"`
    //	RedCat   *Cat `name:"cat"`
    func NewZoo(inj Zoo) *Zoo {
    	println("new zoo")
    	return &Zoo{
    		BlackDog: inj.BlackDog,
    		RedCat:   inj.RedCat,
    opened by New2Niu 1
  • How to test dig container

    How to test dig container

    I am compelled to ask here but I am unable to find how to test the dig containers and services created by it. There is an unanswered stackoverflow question as well. https://stackoverflow.com/questions/71220974/how-to-test-uber-dig-application-golang

    Please point me to the right direction and some help please.


    opened by sahilpaudel 0
  • Parallel container startup with deferred values

    Parallel container startup with deferred values

    Hi dig maintainers,

    My organization made an internal tool that has many different startup tasks that all produce a unique Go type. Before dig/fx, some tasks wrote to a shared struct, some tasks read from it, and some did both. This meant having to carefully order functions, keeping in mind these implicit dependencies hidden in func bodies. I'm busy removing this shared struct and rewriting each task as a dig/fx provider and letting dig order things automatically. It's wonderful! Can't thank you enough.

    However—and sorry for frontloading this so much—our existing code, poor quality as it is, does perform many slow tasks in parallel. Forcing these to happen in serial would push our execution time over our execution frequency. But dependency injection with dig is a perfect match with our codebase, so I would really like to work something out.

    I don't believe the core of dig is incompatible with parallel execution. To prove this to myself, as a first pass I made paramList use an Errgroup to call all its children and wait for them to finish, and I made the store maps sync.Map. Where two goroutines reached the same constructorNode, I put a mutex to protect the called field. It worked but felt too simplistic and hard to control.

    The approach I settled on lets all dig code run in one goroutine, and user-provided constructors can either run in the same goroutine (default) or in pooled/ephemeral goroutines. This keeps mutexes out of dig's data structures and lets users decide how much concurrency they want.

    I tried this several ways, but this pull request is the cleanest way I found. It creates a new deferred type params and constructorNodes return. A deferred can be observed and resolved like a very simple Promise. Since params and constructors pass values indirectly via a Scope, deferred doesn't need much state.

    I would very much like to get concurrent initialization into dig by any means; it doesn't have to be this pull request. I'm willing to any changes you deem necessary; let's work together!

    Refs GO-1191

    opened by xandris 8
  • v1.15.0(Aug 3, 2022)


    • Support for soft value groups, which specify a value group that only gets populated with values from already-executed constructors.


    • Fix an issue with invoke order affecting results provided by private provides.

    Thanks to @hbdf for their contributions to this release.

    Source code(tar.gz)
    Source code(zip)
  • v1.14.1(Mar 22, 2022)


    • Fix an issue where a dependency for a decoration supplied by another decorator in the same scope is ignored.
    • Fix a panic when submitting a single value as a value group in Scope.Decorate.
    • Upon a provide error, make the error message contain the function named specified by LocationForPC Option.
    Source code(tar.gz)
    Source code(zip)
  • v1.14.0(Feb 28, 2022)


    • Introduce dig.Scope which creates a scoped dependency injection container to scope dependencies.
    • Introduce Scope.Decorate and Container.Decorate which allows a decorator to modify a dependency already provided in the dependency graph.
    • Add FillDecorateInfo Option and DecorateInfo struct which exposes information on what Dig was able to understand from the decorator provided with Scope.Decorate or Container.Decorate.


    • The error message that appears when a cycle is detected in the dependency graph has been changed slightly.


    • A stack overflow bug that happens when cycles are introduced via self-pointing dependencies with DeferAcyclicVerification.
    Source code(tar.gz)
    Source code(zip)
  • v1.13.0(Sep 21, 2021)


    • Introduce As option which supports providing a type as interface(s) it implements to the container.
    • Add LocationForPC option which overrides the function inspection for a program counter address to a provided function info.
    Source code(tar.gz)
    Source code(zip)
  • v1.12.0(Aug 4, 2021)


    • Support for ProvideInfo and FillProvideInfo that allow the caller of Provide to get info about what dig understood from the constructor.
    Source code(tar.gz)
    Source code(zip)
  • v1.11.0(Jun 9, 2021)

  • v1.10.0(Jun 16, 2020)


    • Introduce DryRun Option which, when set to true, disables invocation of functions supplied to Provide and Invoke. This option will be used to build no-op containers, for example for fx.ValidateApp method.
    Source code(tar.gz)
    Source code(zip)
  • v1.9.0(Apr 6, 2020)


    • GraphViz visualization of the graph now includes names of packages next to constructors.
    • Added a flatten modifier to group tags for slices to allow providing individual elements instead of the slice for a group value. See package doucmentation for more information.


    • Drop library dependency on golang.org/x/lint.
    • Support printing multi-line error messages with %+v.
    Source code(tar.gz)
    Source code(zip)
  • v1.8.0(Nov 14, 2019)

  • v1.7.0(Jan 4, 2019)


    • Added Group option for Provide to add value groups to the container without rewriting constructors. See package doucmentation for more information.
    Source code(tar.gz)
    Source code(zip)
  • v1.6.0(Nov 6, 2018)


    • When an error graph is visualized, the graph is pruned so that the graph only contains failure nodes.
    • Container visualization is now oriented from right to left.
    Source code(tar.gz)
    Source code(zip)
  • v1.5.1(Nov 1, 2018)

  • v1.5.0(Sep 19, 2018)


    • Added a DeferAcyclicVerification container option that defers graph cycle detection until the next Invoke.


    • Improved cycle-detection performance by 50x in certain degenerative cases.
    Source code(tar.gz)
    Source code(zip)
  • v1.4.0(Aug 17, 2018)


    • Added Visualize function to visualize the state of the container in the GraphViz DOT format. This allows visualization of error types and the dependency relationships of types in the container.
    • Added CanVisualizeError function to determine if an error can be visualized in the graph.
    • Added Name option for Provide to add named values to the container without rewriting constructors. See package documentation for more information.


    • name:"..." tags on nested Result Objects will now cause errors instead of being ignored.
    Source code(tar.gz)
    Source code(zip)
  • v1.3.0(Dec 4, 2017)

  • v1.2.0(Nov 7, 2017)

    • dig.In and dig.Out now support value groups, making it possible to produce many values of the same type from different constructors. See package documentation for more information.
    Source code(tar.gz)
    Source code(zip)
  • v1.1.0(Sep 15, 2017)

    • Added the dig.RootCause function which allows retrieving the original constructor error that caused an Invoke failure.
    • Errors from Invoke now attempt to hint to the user a presence of a similar type, for example a pointer to the requested type and vice versa.
    Source code(tar.gz)
    Source code(zip)
  • v1.0.0(Jul 31, 2017)

    First stable release: no breaking changes will be made in the 1.x series.

    • Provide and Invoke will now fail if dig.In or dig.Out structs contain unexported fields. Previously these fields were ignored which often led to confusion.
    Source code(tar.gz)
    Source code(zip)
  • v1.0.0-rc2(Jul 21, 2017)

    • Added variadic options to all public APIS so that new functionality can be introduced post v1.0.0 without introducing breaking changes.
    • Functions with variadic arguments can now be passed to dig.Provide and dig.Invoke. Previously this caused an error, whereas now the args will be ignored.
    • Exported dig.IsIn and dig.IsOut so that consuming libraries can check if a params or return struct embeds the dig.In and dig.Out types, respectively.
    Source code(tar.gz)
    Source code(zip)
  • v1.0.0-rc1(Jun 21, 2017)

  • v0.5.0(Jun 19, 2017)

    • dig.In and dig.Out now support named instances, i.e.:

      type param struct {
        DB1 DB.Connection `name:"primary"`
        DB2 DB.Connection `name:"secondary"`
    • Structs compatible with dig.In and dig.Out may now be generated using reflect.StructOf.

    Source code(tar.gz)
    Source code(zip)
  • v0.4.0(Jun 12, 2017)

    • [Breaking] Remove Must* funcs to greatly reduce API surface area.
    • [Breaking] Restrict the API surface to only Provide and Invoke.
    • Providing constructors with common returned types results in an error.
    • [Breaking] Update Provide method to accept variadic arguments.
    • Add dig.In embeddable type for advanced use-cases of specifying dependencies.
    • Add dig.Out embeddable type for advanced use-cases of constructors inserting types in the container.
    • Add support for optional parameters through optional:"true" tag on dig.In objects.
    • Add support for value types and many built-ins (maps, slices, channels).
    Source code(tar.gz)
    Source code(zip)
  • v0.3(May 2, 2017)

    API renaming and introducing Invoke functionality

    • Rename RegisterAll and MustRegisterAll to ProvideAll and MustProvideAll.
    • Add functionality to Provide to support constructor with n return objects to be resolved into the dig.Graph
    • Add Invoke function to invoke provided function and insert return objects into the dig.Graph
    Source code(tar.gz)
    Source code(zip)
  • v0.2(Mar 28, 2017)

    API cleanup and removal of the global graph

    • Rename Register to Provide for clarity and to reduce clash with other Register functions.
    • Rename dig.Graph to dig.Container.
    • Remove the package-level functions and the DefaultGraph.
    Source code(tar.gz)
    Source code(zip)
  • v0.1(Mar 23, 2017)

    This version is all about singleton objects: create them, share them in the graph through constructors, or by registering a pointer directly.

    Source code(tar.gz)
    Source code(zip)
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