Method buildRouterChains

echo.go:395–408

buildRouterChains compiles the global and pre-middleware chains once so that ServeHTTP does not have to re-wrap middleware closures on every request. It must be called whenever e.middleware or e.premiddleware changes (i.e. from Use/Pre). This is safe because middleware must not be mutated after the

()

// re-wrap middleware closures on every request. It must be called whenever e.middleware or e.premiddleware
// changes (i.e. from Use/Pre). This is safe because middleware must not be mutated after the server starts.
func (e *Echo) buildRouterChains() {
	// dispatch is the terminal of the global chain: it invokes the handler resolved during routing.
	dispatch := func(c *Context) error {
		return c.handler(c)
	}
	e.chain = applyMiddleware(dispatch, e.middleware...)

	// route performs routing (storing the matched handler on the Context) and then runs the global chain.
	route := func(c *Context) error {
		c.handler = e.router.Route(c)
		return e.chain(c)
	}
	e.preChain = applyMiddleware(route, e.premiddleware...)
}

// NewContext returns a new Context instance.
//