By default, if using the net package a build will likely produce a binary with some dynamic linking, e.g. to libc. You can inspect dynamically vs. statically link by viewing the result of ldd output.bin There are two solutions I’ve come across: Disable CGO, via CGO_ENABLED=0 Force the use of the Go implementation of net … Read more
I believe you want something like this: type Person struct { Name string `json:”name”` Age int `json:”age”` } type Info map[string]Person Then, after decoding this works: fmt.Printf(“%s: %d\n”, info[“bvu62fu6dq”].Name, info[“bvu62fu6dq”].Age) Full example: http://play.golang.org/p/FyH-cDp3Na
I do this with most of my Go web apps. I use go-bindata to auto-generate Go source code from all the files I want to embed and then compile them into the binary. All this is done automatically during build. One downside is that the current go build tools do not offer a way to … Read more
The function is defined here: // startTimer adds t to the timer heap. //go:linkname startTimer time.startTimer func startTimer(t *timer) { if raceenabled { racerelease(unsafe.Pointer(t)) } addtimer(t) } Function declarations: A function declaration may omit the body. Such a declaration provides the signature for a function implemented outside Go, such as an assembly routine. Not every … Read more
If you want to pass a slice as a parameter to a function, and have that function modify the original slice, then you have to pass a pointer to the slice: func myAppend(list *[]string, value string) { *list = append(*list, value) } I have no idea if the Go compiler is naive or smart about … Read more
Turns out my code is 100% fine; it was a copy of Go 1.0; under go 1.1 this works. Under go 1.0, it doesn’t. (it’s a bit lame answering my own question, I know; but the ‘use -L -l answers below aren’t right either; it had nothing to do with that). A working solution example … Read more
FWIW, this is my CORS Middleware that works for my needs. func CORSMiddleware() gin.HandlerFunc { return func(c *gin.Context) { c.Writer.Header().Set(“Access-Control-Allow-Origin”, “*”) c.Writer.Header().Set(“Access-Control-Allow-Credentials”, “true”) c.Writer.Header().Set(“Access-Control-Allow-Headers”, “Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With”) c.Writer.Header().Set(“Access-Control-Allow-Methods”, “POST, OPTIONS, GET, PUT”) if c.Request.Method == “OPTIONS” { c.AbortWithStatus(204) return } c.Next() } }
Go performs pointer escape analysis. If the pointer escapes the local stack, which it does in this case, the object is allocated on the heap. If it doesn’t escape the local function, the compiler is free to allocate it on the stack (although it makes no guarantees; it depends on whether the pointer escape analysis … Read more
I found a solution: package main import ( “fmt” “reflect” “runtime” ) func foo() { } func GetFunctionName(i interface{}) string { return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name() } func main() { // This will print “name: main.foo” fmt.Println(“name:”, GetFunctionName(foo)) }
The simplest way would be to use https://github.com/mitchellh/mapstructure import “github.com/mitchellh/mapstructure” mapstructure.Decode(myData, &result) If you want to do it yourself, you could do something like this: http://play.golang.org/p/tN8mxT_V9h func SetField(obj interface{}, name string, value interface{}) error { structValue := reflect.ValueOf(obj).Elem() structFieldValue := structValue.FieldByName(name) if !structFieldValue.IsValid() { return fmt.Errorf(“No such field: %s in obj”, name) } if !structFieldValue.CanSet() … Read more