added to docs
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@ -7,6 +7,37 @@ package flog
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// re-Route a 'message' (and 'context') to, but only on the
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// condition that 'filterFn' returns 'true' for the 'message'
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// and 'context' passed to it.
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//
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// An example for 'filterFn' is the following.
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//
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// func filterError(message string, context map[string]interface{})bool) bool {
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// if datum, ok := context["error"]; !ok {
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// return false
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// } else if _, ok := datum.(error); !ok {
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// return false
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// } else {
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// return true
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// }
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// }
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//
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// This func will make it so only re-route messages whose context #1 has the key "error"
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// and #2 the value of the context at key "key" fits the builtin Go 'error' interface.
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//
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// Also, a rather useless example, but a 'filterFn' that would reject all messages (and
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// contexts) is:
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//
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// func filterRejectAll(message string, context map[string]interface{})bool) bool {
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// return false
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// }
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//
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//
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// And also, another rather useless example, but a 'filterFn' that would allow all messages
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// (and contexts) is:
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//
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// func filterAcceptAll(message string, context map[string]interface{})bool) bool {
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// return true
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// }
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//
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func NewFilteredRouter(subrouter Router, filterFn func(string, map[string]interface{})bool) *FilteredRouter {
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router := FilteredRouter{
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subrouter:subrouter,
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