base on An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications. # 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) ", Assign "at most 3 tags" to the expected json: {"id":"10490","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"