259 lines
11 KiB
C
259 lines
11 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* An abstraction layer for RESTful Web services (Erbium).
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* Inspired by RESTful Contiki by Dogan Yazar.
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#ifndef REST_ENGINE_H_
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#define REST_ENGINE_H_
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#include <stdio.h>
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#include "contiki.h"
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#include "contiki-lib.h"
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#include "rest-constants.h"
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/* list of valid REST Enigne implementations */
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#define REGISTERED_ENGINE_ERBIUM coap_rest_implementation
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#define REGISTERED_ENGINE_HELIUM http_rest_implementation
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/* sanity check for configured implementation */
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#if !defined(REST) || (REST != REGISTERED_ENGINE_ERBIUM && REST != REGISTERED_ENGINE_HELIUM)
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#error "Define a valid REST Engine implementation (REST define)!"
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#endif
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/*
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* The maximum buffer size that is provided for resource responses and must be respected due to the limited IP buffer.
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* Larger data must be handled by the resource and will be sent chunk-wise through a TCP stream or CoAP blocks.
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*/
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#ifndef REST_MAX_CHUNK_SIZE
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#define REST_MAX_CHUNK_SIZE 64
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#endif
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struct resource_s;
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struct periodic_resource_s;
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/* signatures of handler functions */
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typedef void (*restful_handler)(void *request, void *response,
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uint8_t *buffer, uint16_t preferred_size,
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int32_t *offset);
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typedef void (*restful_final_handler)(struct resource_s *resource,
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void *request, void *response);
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typedef void (*restful_periodic_handler)(void);
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typedef void (*restful_response_handler)(void *data, void *response);
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typedef void (*restful_trigger_handler)(void);
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/* signature of the rest-engine service function */
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typedef int (*service_callback_t)(void *request, void *response,
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uint8_t *buffer, uint16_t preferred_size,
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int32_t *offset);
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/* data structure representing a resource in REST */
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struct resource_s {
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struct resource_s *next; /* for LIST, points to next resource defined */
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const char *url; /*handled URL */
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rest_resource_flags_t flags; /* handled RESTful methods */
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const char *attributes; /* link-format attributes */
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restful_handler get_handler; /* handler function */
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restful_handler post_handler; /* handler function */
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restful_handler put_handler; /* handler function */
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restful_handler delete_handler; /* handler function */
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union {
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struct periodic_resource_s *periodic; /* special data depending on flags */
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restful_trigger_handler trigger;
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restful_trigger_handler resume;
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};
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};
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typedef struct resource_s resource_t;
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struct periodic_resource_s {
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struct periodic_resource_s *next; /* for LIST, points to next resource defined */
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const resource_t *resource;
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uint32_t period;
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struct etimer periodic_timer;
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const restful_periodic_handler periodic_handler;
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};
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typedef struct periodic_resource_s periodic_resource_t;
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/*
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* Macro to define a RESTful resource.
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* Resources are statically defined for the sake of efficiency and better memory management.
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*/
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#define RESOURCE(name, attributes, get_handler, post_handler, put_handler, delete_handler) \
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resource_t name = { NULL, NULL, NO_FLAGS, attributes, get_handler, post_handler, put_handler, delete_handler, { NULL } }
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#define PARENT_RESOURCE(name, attributes, get_handler, post_handler, put_handler, delete_handler) \
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resource_t name = { NULL, NULL, HAS_SUB_RESOURCES, attributes, get_handler, post_handler, put_handler, delete_handler, { NULL } }
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#define SEPARATE_RESOURCE(name, attributes, get_handler, post_handler, put_handler, delete_handler, resume_handler) \
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resource_t name = { NULL, NULL, IS_SEPARATE, attributes, get_handler, post_handler, put_handler, delete_handler, { .resume = resume_handler } }
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#define EVENT_RESOURCE(name, attributes, get_handler, post_handler, put_handler, delete_handler, event_handler) \
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resource_t name = { NULL, NULL, IS_OBSERVABLE, attributes, get_handler, post_handler, put_handler, delete_handler, { .trigger = event_handler } }
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/*
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* Macro to define a periodic resource.
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* The corresponding [name]_periodic_handler() function will be called every period.
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* For instance polling a sensor and publishing a changed value to subscribed clients would be done there.
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* The subscriber list will be maintained by the final_handler rest_subscription_handler() (see rest-mapping header file).
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*/
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#define PERIODIC_RESOURCE(name, attributes, get_handler, post_handler, put_handler, delete_handler, period, periodic_handler) \
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periodic_resource_t periodic_##name; \
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resource_t name = { NULL, NULL, IS_OBSERVABLE | IS_PERIODIC, attributes, get_handler, post_handler, put_handler, delete_handler, { .periodic = &periodic_##name } }; \
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periodic_resource_t periodic_##name = { NULL, &name, period, { { 0 } }, periodic_handler };
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struct rest_implementation {
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char *name;
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/** Initialize the REST implementation. */
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void (*init)(void);
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/** Register the RESTful service callback at implementation. */
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void (*set_service_callback)(service_callback_t callback);
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/** Get request URI path. */
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int (*get_url)(void *request, const char **url);
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/** Get the method of a request. */
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rest_resource_flags_t (*get_method_type)(void *request);
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/** Set the status code of a response. */
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int (*set_response_status)(void *response, unsigned int code);
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/** Get the content-type of a request. */
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int (*get_header_content_type)(void *request,
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unsigned int *content_format);
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/** Set the Content-Type of a response. */
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int (*set_header_content_type)(void *response,
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unsigned int content_format);
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/** Get the Accept types of a request. */
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int (*get_header_accept)(void *request, unsigned int *accept);
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/** Get the Length option of a request. */
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int (*get_header_length)(void *request, uint32_t *size);
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/** Set the Length option of a response. */
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int (*set_header_length)(void *response, uint32_t size);
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/** Get the Max-Age option of a request. */
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int (*get_header_max_age)(void *request, uint32_t *age);
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/** Set the Max-Age option of a response. */
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int (*set_header_max_age)(void *response, uint32_t age);
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/** Set the ETag option of a response. */
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int (*set_header_etag)(void *response, const uint8_t *etag,
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size_t length);
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/** Get the If-Match option of a request. */
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int (*get_header_if_match)(void *request, const uint8_t **etag);
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/** Get the If-Match option of a request. */
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int (*get_header_if_none_match)(void *request);
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/** Get the Host option of a request. */
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int (*get_header_host)(void *request, const char **host);
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/** Set the location option of a response. */
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int (*set_header_location)(void *response, const char *location);
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/** Get the payload option of a request. */
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int (*get_request_payload)(void *request, const uint8_t **payload);
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/** Set the payload option of a response. */
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int (*set_response_payload)(void *response, const void *payload,
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size_t length);
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/** Get the query string of a request. */
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int (*get_query)(void *request, const char **value);
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/** Get the value of a request query key-value pair. */
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int (*get_query_variable)(void *request, const char *name,
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const char **value);
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/** Get the value of a request POST key-value pair. */
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int (*get_post_variable)(void *request, const char *name,
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const char **value);
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/** Send the payload to all subscribers of the resource at url. */
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void (*notify_subscribers)(resource_t *resource);
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/** The handler for resource subscriptions. */
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restful_final_handler subscription_handler;
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/* REST status codes. */
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const struct rest_implementation_status status;
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/* REST content-types. */
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const struct rest_implementation_type type;
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};
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/* instance of REST implementation */
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extern const struct rest_implementation REST;
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/*
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* To be called by HTTP/COAP server as a callback function when a new service request appears.
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* This function dispatches the corresponding RESTful service.
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*/
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int rest_invoke_restful_service(void *request, void *response,
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uint8_t *buffer, uint16_t buffer_size,
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int32_t *offset);
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initializes REST framework and starts the HTTP or CoAP process.
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*/
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void rest_init_engine(void);
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/*---------------------------------------------------------------------------*/
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/**
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*
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* \brief Resources wanted to be accessible should be activated with the following code.
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* \param resource
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* A RESTful resource defined through the RESOURCE macros.
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* \param path
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* The local URI path where to provide the resource.
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*/
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void rest_activate_resource(resource_t *resource, char *path);
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Returns the list of registered RESTful resources.
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* \return The resource list.
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*/
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list_t rest_get_resources(void);
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/*---------------------------------------------------------------------------*/
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#endif /*REST_ENGINE_H_ */
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