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Merge pull request #106 from jmoriau/added-feature-to-filters

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Ability to add many blocks per route filter
This commit is contained in:
Serdar Dogruyol 2016-02-17 21:59:07 +02:00
commit 43d34886c4
2 changed files with 65 additions and 26 deletions
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40
spec/middleware/filters_spec.cr
View file

@ -143,6 +143,46 @@ describe "Kemal::Middleware::Filters" do
client_response = HTTP::Client::Response.from_io(io_with_context, decompress: false)
client_response.body.should eq("false")
end
it "executes 3 differents blocks after all request" do
test_filter = FilterTest.new
test_filter.modified = "false"
test_filter_second = FilterTest.new
test_filter_second.modified = "false"
test_filter_third = FilterTest.new
test_filter_third.modified = "false"
filter_middleware = Kemal::Middleware::Filter.new
filter_middleware._add_route_filter("ALL", "/greetings", :before) { test_filter.modified = test_filter.modified == "true" ? "false" : "true" }
filter_middleware._add_route_filter("ALL", "/greetings", :before) { test_filter_second.modified = test_filter_second.modified == "true" ? "false" : "true" }
filter_middleware._add_route_filter("ALL", "/greetings", :before) { test_filter_third.modified = test_filter_third.modified == "true" ? "false" : "true" }
kemal = Kemal::RouteHandler::INSTANCE
kemal.add_route "GET", "/greetings" { test_filter.modified }
kemal.add_route "POST", "/greetings" { test_filter_second.modified }
kemal.add_route "PUT", "/greetings" { test_filter_third.modified }
test_filter.modified.should eq("false")
test_filter_second.modified.should eq("false")
test_filter_third.modified.should eq("false")
request = HTTP::Request.new("GET", "/greetings")
create_request_and_return_io(filter_middleware, request)
io_with_context = create_request_and_return_io(kemal, request)
client_response = HTTP::Client::Response.from_io(io_with_context, decompress: false)
client_response.body.should eq("true")
request = HTTP::Request.new("POST", "/greetings")
create_request_and_return_io(filter_middleware, request)
io_with_context = create_request_and_return_io(kemal, request)
client_response = HTTP::Client::Response.from_io(io_with_context, decompress: false)
client_response.body.should eq("false")
request = HTTP::Request.new("PUT", "/greetings")
create_request_and_return_io(filter_middleware, request)
io_with_context = create_request_and_return_io(kemal, request)
client_response = HTTP::Client::Response.from_io(io_with_context, decompress: false)
client_response.body.should eq("true")
end
end
class FilterTest

51
src/kemal/middleware/filters.cr
View file

@ -21,55 +21,50 @@ module Kemal::Middleware
context
end
# This checks is filter is already defined for the verb/path/type combination
def filter_for_path_type_defined?(verb, path, type)
lookup = @tree.find radix_path(verb, path, type)
lookup.found? && lookup.payload.is_a? Block
end
# :nodoc: This shouldn't be called directly, it's not private because I need to call it for testing purpose since I can't call the macros in the spec.
# It adds the block for the corresponding verb/path/type combination to the tree.
def _add_route_filter(verb, path, type, &block : HTTP::Server::Context -> _)
node = radix_path(verb, path, type)
@tree.add node, Block.new &block
lookup = lookup_filters_for_path_type(verb, path, type)
if lookup.found? && lookup.payload.is_a?(Array(Block))
(lookup.payload as Array(Block)) << Block.new(&block)
else
@tree.add radix_path(verb, path, type), [Block.new(&block)]
end
end
# This can be called directly but it's simpler to just use the macros, it will check if another filter is not already defined for this verb/path/type and proceed to call `add_route_filter`
def before(verb, path = "*", &block : HTTP::Server::Context -> _)
raise Kemal::Middleware::Filter::BeforeFilterAlreadyDefinedException.new(verb, path) if filter_for_path_type_defined?(verb, path, :before)
_add_route_filter verb, path, :before, &block
end
# This can be called directly but it's simpler to just use the macros, it will check if another filter is not already defined for this verb/path/type and proceed to call `add_route_filter`
def after(verb, path = "*", &block : HTTP::Server::Context -> _)
raise Kemal::Middleware::Filter::AfterFilterAlreadyDefinedException.new(verb, path) if filter_for_path_type_defined?(verb, path, :after)
_add_route_filter verb, path, :after, &block
end
# This will fetch the block for the verb/path/type from the tree and call it.
private def call_block_for_path_type(verb, path, type, context)
lookup = @tree.find radix_path(verb, path, type)
if lookup.found? && lookup.payload.is_a? Block
block = lookup.payload as Block
block.block.call(context)
lookup = lookup_filters_for_path_type(verb, path, type)
if lookup.found? && lookup.payload.is_a? Array(Block)
blocks = lookup.payload as Array(Block)
blocks.each { |block| block.call(context) }
end
end
# This checks is filter is already defined for the verb/path/type combination
private def filter_for_path_type_defined?(verb, path, type)
lookup = @tree.find radix_path(verb, path, type)
lookup.found? && lookup.payload.is_a? Block
end
# This returns a lookup for verb/path/type
private def lookup_filters_for_path_type(verb, path, type)
@tree.find radix_path(verb, path, type)
end
private def radix_path(verb, path, type : Symbol)
"#{type}/#{verb}/#{path}"
end
class BeforeFilterAlreadyDefinedException < Exception
def initialize(verb, path)
super "A before-filter is already defined for path: '#{verb}:#{path}'."
end
end
class AfterFilterAlreadyDefinedException < Exception
def initialize(verb, path)
super "An after-filter is already defined for path: '#{verb}:#{path}'."
end
end
end
class Block
@ -77,6 +72,10 @@ module Kemal::Middleware
def initialize(&@block : HTTP::Server::Context -> _)
end
def call(context)
@block.call(context)
end
end
end