keeper

keeper is package for Go that provides a mechanism for waiting a result of execution function until context cancel.

Install

go get github.com/gunosy/keeper

Usage

ExecWithContext wraps function which is wanted to be canceled by context. This function is watching context whether context is canceled, and wait for executing function until context canceled.

import (
    "context"
    "time"

    "github.com/gunosy/keeper"
)

func findSomething(ctx context.Context, userID string) ([]int, error) {
    // some logic    	
}

ctx := context.WithTimeout(context.Background(), 100 * time.Millisecond)
result, err := keeper.ExecWithContext(ctx, func() (interface{}, error) {
    result, err := findSomething(ctx, userID) // exec heavy func
    return result, err
})
if result == nil {
    return nil, err
}
return result.([]int), err