256 lines
7.5 KiB
Plaintext
256 lines
7.5 KiB
Plaintext
note
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description: "Summary description for {ORDER_HANDLER}."
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author: ""
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date: "$Date$"
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revision: "$Revision$"
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class
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ORDER_HANDLER [C -> REQUEST_HANDLER_CONTEXT]
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inherit
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REQUEST_HANDLER [C]
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REQUEST_RESOURCE_HANDLER_HELPER [C]
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redefine
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do_get,
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do_post,
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do_put,
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do_delete
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end
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SHARED_DATABASE_API
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SHARED_EJSON
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REFACTORING_HELPER
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SHARED_ORDER_VALIDATION
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feature -- execute
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execute (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
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-- Execute request handler
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do
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execute_methods (ctx, req, res)
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end
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feature -- API DOC
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api_doc : STRING = "URI:/order METHOD: POST%N URI:/order/{orderid} METHOD: GET, PUT, DELETE%N"
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feature -- HTTP Methods
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do_get (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
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-- Using GET to retrieve resource information.
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-- If the GET request is SUCCESS, we response with
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-- 200 OK, and a representation of the order
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-- If the GET request is not SUCCESS, we response with
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-- 404 Resource not found
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local
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id : STRING
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do
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if attached req.orig_path_info as orig_path then
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id := get_order_id_from_path (orig_path)
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if attached retrieve_order (id) as l_order then
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compute_response_get (ctx, req, res, l_order)
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else
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handle_resource_not_found_response ("The following resource" + orig_path + " is not found ", ctx, req, res)
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end
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end
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end
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compute_response_get (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE; l_order : ORDER)
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local
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h: WSF_HEADER
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l_msg : STRING
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do
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create h.make
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h.put_status ({HTTP_STATUS_CODE}.ok)
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h.put_content_type_application_json
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if attached {JSON_VALUE} json.value (l_order) as jv then
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l_msg := jv.representation
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h.put_content_length (l_msg.count)
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if attached req.request_time as time then
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h.add_header ("Date:" + time.formatted_out ("ddd,[0]dd mmm yyyy [0]hh:[0]mi:[0]ss.ff2") + " GMT")
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end
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res.set_status_code ({HTTP_STATUS_CODE}.ok)
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res.write_headers_string (h.string)
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res.write_string (l_msg)
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end
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end
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do_put (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
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local
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l_post: STRING
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l_location : STRING
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l_order : detachable ORDER
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h : WSF_HEADER
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do
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fixme ("TODO handle an Internal Server Error")
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fixme ("Refactor the code, create new abstractions")
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fixme ("Add Header Date to the response")
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fixme ("Put implementation is wrong!!!!")
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req.input.read_stream (req.content_length_value.as_integer_32)
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l_post := req.input.last_string
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l_order := extract_order_request(l_post)
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fixme ("TODO move to a service method")
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if l_order /= Void and then db_access.orders.has_key (l_order.id) then
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update_order( l_order)
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create h.make
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h.put_status ({HTTP_STATUS_CODE}.ok)
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h.put_content_type ("application/json")
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if attached req.request_time as time then
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h.add_header ("Date:" +time.formatted_out ("ddd,[0]dd mmm yyyy [0]hh:[0]mi:[0]ss.ff2") + " GMT")
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end
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if attached req.http_host as host then
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l_location := "http://"+host +req.request_uri+"/" + l_order.id
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h.add_header ("Location:"+ l_location)
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end
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if attached {JSON_VALUE} json.value (l_order) as jv then
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h.put_content_length (jv.representation.count)
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res.set_status_code ({HTTP_STATUS_CODE}.ok)
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res.write_headers_string (h.string)
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res.write_string (jv.representation)
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end
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else
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handle_bad_request_response (l_post +"%N is not a valid ORDER, maybe the order does not exist in the system", ctx, req, res)
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end
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end
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do_delete (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
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local
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id: STRING
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h : WSF_HEADER
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do
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fixme ("TODO handle an Internal Server Error")
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fixme ("Refactor the code, create new abstractions")
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if attached req.orig_path_info as orig_path then
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id := get_order_id_from_path (orig_path)
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if db_access.orders.has_key (id) then
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delete_order( id)
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create h.make
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h.put_status ({HTTP_STATUS_CODE}.no_content)
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h.put_content_type ("application/json")
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if attached req.request_time as time then
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h.put_utc_date (time)
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end
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res.set_status_code ({HTTP_STATUS_CODE}.no_content)
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res.write_headers_string (h.string)
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else
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handle_resource_not_found_response (orig_path + " not found in this server", ctx, req, res)
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end
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end
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end
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do_post (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
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-- Here the convention is the following.
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-- POST is used for creation and the server determines the URI
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-- of the created resource.
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-- If the request post is SUCCESS, the server will create the order and will response with
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-- HTTP_RESPONSE 201 CREATED, the Location header will contains the newly created order's URI
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-- if the request post is not SUCCESS, the server will response with
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-- HTTP_RESPONSE 400 BAD REQUEST, the client send a bad request
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-- HTTP_RESPONSE 500 INTERNAL_SERVER_ERROR, when the server can deliver the request
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local
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l_post: STRING
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do
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req.input.read_stream (req.content_length_value.as_integer_32)
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l_post := req.input.last_string
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if attached extract_order_request (l_post) as l_order then
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save_order (l_order)
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compute_response_post (ctx, req, res, l_order)
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else
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handle_bad_request_response (l_post +"%N is not a valid ORDER", ctx, req, res)
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end
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end
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compute_response_post (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE; l_order : ORDER)
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local
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h: WSF_HEADER
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l_msg : STRING
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l_location : STRING
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joc : JSON_ORDER_CONVERTER
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do
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create h.make
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create joc.make
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json.add_converter(joc)
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h.put_status ({HTTP_STATUS_CODE}.created)
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h.put_content_type_application_json
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if attached {JSON_VALUE} json.value (l_order) as jv then
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l_msg := jv.representation
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h.put_content_length (l_msg.count)
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if attached req.http_host as host then
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l_location := "http://" + host + req.request_uri + "/" + l_order.id
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h.put_location (l_location)
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end
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if attached req.request_time as time then
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h.put_utc_date (time)
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end
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res.set_status_code ({HTTP_STATUS_CODE}.created)
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res.write_headers_string (h.string)
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res.write_string (l_msg)
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end
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end
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feature {NONE} -- URI helper methods
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get_order_id_from_path (a_path: READABLE_STRING_32) : STRING
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do
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Result := a_path.split ('/').at (3)
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end
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feature {NONE} -- Implementation Repository Layer
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retrieve_order ( id : STRING) : detachable ORDER
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-- get the order by id if it exist, in other case, Void
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do
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Result := db_access.orders.item (id)
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end
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save_order (an_order: ORDER)
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-- save the order to the repository
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local
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i : INTEGER
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do
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from
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i := 1
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until
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not db_access.orders.has_key ((db_access.orders.count + i).out)
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loop
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i := i + 1
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end
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an_order.set_id ((db_access.orders.count + i).out)
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an_order.set_status ("submitted")
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an_order.add_revision
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db_access.orders.force (an_order, an_order.id)
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end
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update_order (an_order: ORDER)
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-- update the order to the repository
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do
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an_order.add_revision
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db_access.orders.force (an_order, an_order.id)
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end
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delete_order (an_order: STRING)
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-- update the order to the repository
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do
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db_access.orders.remove (an_order)
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end
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extract_order_request (l_post : STRING) : detachable ORDER
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-- extract an object Order from the request, or Void
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-- if the request is invalid
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local
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parser : JSON_PARSER
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joc : JSON_ORDER_CONVERTER
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do
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create joc.make
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json.add_converter(joc)
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create parser.make_parser (l_post)
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if attached parser.parse as jv and parser.is_parsed then
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Result ?= json.object (jv, "ORDER")
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end
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end
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note
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copyright: "2011-2011, Javier Velilla and others"
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license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
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end
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