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Implementation of Facebook's DataLoader in Golang
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robinbraemer and nicksrandall Fix typos (#48)
* Update dataloader.go

* Update inMemoryCache.go

* Update key.go

* Update

* Update inMemoryCache_go19.go
Latest commit 1232fe3 Feb 27, 2019
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Godeps Adding support for godep Apr 11, 2018
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.gitignore start of v3 Nov 29, 2017
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LICENSE add name and year to licence Dec 15, 2016
cache.go Implement `Key` interface for V5 Jan 4, 2018
codecov.yml Create codecov.yml Dec 20, 2016
inMemoryCache.go Fix typos (#48) Feb 27, 2019
inMemoryCache_go19.go Fix typos (#48) Feb 27, 2019


GoDoc Build Status

This is an implementation of Facebook's DataLoader in Golang.


go get -u


// setup batch function
batchFn := func(ctx context.Context, keys dataloader.Keys) []*dataloader.Result {
  var results []*dataloader.Result
  // do some aync work to get data for specified keys
  // append to this list resolved values
  return results

// create Loader with an in-memory cache
loader := dataloader.NewBatchedLoader(batchFn)

 * Use loader
 * A thunk is a function returned from a function that is a
 * closure over a value (in this case an interface value and error).
 * When called, it will block until the value is resolved.
thunk := loader.Load(ctx.TODO(), dataloader.StringKey("key1")) // StringKey is a convenience method that make wraps string to implement `Key` interface
result, err := thunk()
if err != nil {
  // handle data error

log.Printf("value: %#v", result)

Don't need/want to use context?

You're welcome to install the v1 version of this library.


This implementation contains a very basic cache that is intended only to be used for short lived DataLoaders (i.e. DataLoaders that ony exsist for the life of an http request). You may use your own implementation if you want.

it also has a NoCache type that implements the cache interface but all methods are noop. If you do not wish to cache anything.


There are a few basic examples in the example folder.

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