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Implementation of Facebook's DataLoader in Golang
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graph-gophers/dataloader
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This is an implementation ofFacebook's DataLoader in Golang.
go get -u github.com/graph-gophers/dataloader
// setup batch function - the first Context passed to the Loader's Load// function will be provided when the batch function is called.batchFn:=func(ctx context.Context,keys dataloader.Keys) []*dataloader.Result {varresults []*dataloader.Result// do some async work to get data for specified keys// append to this list resolved valuesreturnresults}// create Loader with an in-memory cacheloader:=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. * * loader.Load() may be called multiple times for a given batch window. * The first context passed to Load is the object that will be passed * to the batch function. */thunk:=loader.Load(context.TODO(),dataloader.StringKey("key1"))// StringKey is a convenience method that make wraps string to implement `Key` interfaceresult,err:=thunk()iferr!=nil {// handle data error}log.Printf("value: %#v",result)
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 only exist for the life of an http request). You may use your own implementation if you want.
it also has a
NoCachetype 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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