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https://github.com/patrickmn/go-cache

An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications.
https://github.com/patrickmn/go-cache

cache go library

Last synced: 3 months ago
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An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications.

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# go-cache



go-cache is an in-memory key:value store/cache similar to memcached that is

suitable for applications running on a single machine. Its major advantage is

that, being essentially a thread-safe `map[string]interface{}` with expiration

times, it doesn't need to serialize or transmit its contents over the network.



Any object can be stored, for a given duration or forever, and the cache can be

safely used by multiple goroutines.



Although go-cache isn't meant to be used as a persistent datastore, the entire

cache can be saved to and loaded from a file (using `c.Items()` to retrieve the

items map to serialize, and `NewFrom()` to create a cache from a deserialized

one) to recover from downtime quickly. (See the docs for `NewFrom()` for caveats.)



### Installation



`go get github.com/patrickmn/go-cache`



### Usage



```go

import (

	"fmt"

	"github.com/patrickmn/go-cache"

	"time"

)



func main() {

	// Create a cache with a default expiration time of 5 minutes, and which

	// purges expired items every 10 minutes

	c := cache.New(5*time.Minute, 10*time.Minute)



	// Set the value of the key "foo" to "bar", with the default expiration time

	c.Set("foo", "bar", cache.DefaultExpiration)



	// Set the value of the key "baz" to 42, with no expiration time

	// (the item won't be removed until it is re-set, or removed using

	// c.Delete("baz")

	c.Set("baz", 42, cache.NoExpiration)



	// Get the string associated with the key "foo" from the cache

	foo, found := c.Get("foo")

	if found {

		fmt.Println(foo)

	}



	// Since Go is statically typed, and cache values can be anything, type

	// assertion is needed when values are being passed to functions that don't

	// take arbitrary types, (i.e. interface{}). The simplest way to do this for

	// values which will only be used once--e.g. for passing to another

	// function--is:

	foo, found := c.Get("foo")

	if found {

		MyFunction(foo.(string))

	}



	// This gets tedious if the value is used several times in the same function.

	// You might do either of the following instead:

	if x, found := c.Get("foo"); found {

		foo := x.(string)

		// ...

	}

	// or

	var foo string

	if x, found := c.Get("foo"); found {

		foo = x.(string)

	}

	// ...

	// foo can then be passed around freely as a string



	// Want performance? Store pointers!

	c.Set("foo", &MyStruct, cache.DefaultExpiration)

	if x, found := c.Get("foo"); found {

		foo := x.(*MyStruct)

			// ...

	}

}

```



### Reference



`godoc` or [http://godoc.org/github.com/patrickmn/go-cache](http://godoc.org/github.com/patrickmn/go-cache)