61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
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package gosocketio
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import (
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"errors"
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"reflect"
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)
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type caller struct {
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Func reflect.Value
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Args reflect.Type
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Out bool
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}
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var (
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ErrorCallerNotFunc = errors.New("f is not function")
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ErrorCallerNot2Args = errors.New("f should have 2 args")
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ErrorCallerMaxOneValue = errors.New("f should return not more than one value")
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)
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/**
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Parses function passed by using reflection, and stores its representation
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for further call on message or ack
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*/
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func newCaller(f interface{}) (*caller, error) {
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fVal := reflect.ValueOf(f)
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if fVal.Kind() != reflect.Func {
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return nil, ErrorCallerNotFunc
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}
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fType := fVal.Type()
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if fType.NumIn() != 2 {
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return nil, ErrorCallerNot2Args
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}
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if fType.NumOut() > 1 {
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return nil, ErrorCallerMaxOneValue
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}
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return &caller{
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Func: fVal,
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Args: fType.In(1),
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Out: fType.NumOut() == 1,
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}, nil
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}
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/**
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returns function parameter as it is present in it using reflection
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*/
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func (c *caller) getArgs() interface{} {
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return reflect.New(c.Args).Interface()
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}
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/**
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calls function with given arguments from its representation using reflection
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*/
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func (c *caller) callFunc(h *Channel, args interface{}) []reflect.Value {
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a := []reflect.Value{reflect.ValueOf(h), reflect.ValueOf(args).Elem()}
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return c.Func.Call(a)
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}
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