53 lines
1.6 KiB
Crystal
53 lines
1.6 KiB
Crystal
require "http/server"
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require "radix"
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# Kemal::RouteHandler is the main handler which handles all the HTTP requests. Routing, parsing, rendering e.g
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# are done in this handler.
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class Kemal::RouteHandler < HTTP::Handler
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INSTANCE = new
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property tree
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def initialize
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@tree = Radix::Tree(Route).new
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end
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def call(context)
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context.response.content_type = "text/html" unless context.response.headers.has_key?("Content-Type")
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process_request(context)
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end
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# Adds a given route to routing tree. As an exception each `GET` route additionaly defines
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# a corresponding `HEAD` route.
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def add_route(method, path, &handler : HTTP::Server::Context -> _)
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add_to_radix_tree method, path, Route.new(method, path, &handler)
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add_to_radix_tree("HEAD", path, Route.new("HEAD", path, &handler)) if method == "GET"
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end
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# Check if a route is defined and returns the lookup
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def lookup_route(verb, path)
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@tree.find radix_path(verb, path)
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end
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# Processes the route if it's a match. Otherwise renders 404.
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def process_request(context)
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raise Kemal::Exceptions::RouteNotFound.new(context) unless context.route_defined?
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route = context.route_lookup.payload.as(Route)
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content = route.handler.call(context)
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if Kemal.config.error_handlers.has_key?(context.response.status_code)
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raise Kemal::Exceptions::CustomException.new(context)
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end
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context.response.print(content)
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context
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end
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private def radix_path(method : String, path)
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"/#{method.downcase}#{path}"
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end
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private def add_to_radix_tree(method, path, route)
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node = radix_path method, path
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@tree.add node, route
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end
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end
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