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Updated to CoAP Proposed Standard and removed draft versions.

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Matthias Kovatsch 2013-12-18 20:09:33 +01:00 • committed by Matthias Kovatsch
parent 443bbd3948
commit 7d79b69ada
88 changed files with 7325 additions and 14628 deletions
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apps/rest-engine/Makefile.rest-engine Executable file
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rest-engine_src = rest-engine.c

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apps/rest-engine/rest-constants.h Executable file
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/*
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* Constants for the REST Engine (Erbium).
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#ifndef REST_CONSTANTS_H_
#define REST_CONSTANTS_H_
/**
* Generic status codes that are mapped to either HTTP or CoAP codes.
*/
struct rest_implementation_status {
const unsigned int OK; /* CONTENT_2_05, OK_200 */
const unsigned int CREATED; /* CREATED_2_01, CREATED_201 */
const unsigned int CHANGED; /* CHANGED_2_04, NO_CONTENT_204 */
const unsigned int DELETED; /* DELETED_2_02, NO_CONTENT_204 */
const unsigned int NOT_MODIFIED; /* VALID_2_03, NOT_MODIFIED_304 */
const unsigned int BAD_REQUEST; /* BAD_REQUEST_4_00, BAD_REQUEST_400 */
const unsigned int UNAUTHORIZED; /* UNAUTHORIZED_4_01, UNAUTHORIZED_401 */
const unsigned int BAD_OPTION; /* BAD_OPTION_4_02, BAD_REQUEST_400 */
const unsigned int FORBIDDEN; /* FORBIDDEN_4_03, FORBIDDEN_403 */
const unsigned int NOT_FOUND; /* NOT_FOUND_4_04, NOT_FOUND_404 */
const unsigned int METHOD_NOT_ALLOWED; /* METHOD_NOT_ALLOWED_4_05, METHOD_NOT_ALLOWED_405 */
const unsigned int NOT_ACCEPTABLE; /* NOT_ACCEPTABLE_4_06, NOT_ACCEPTABLE_406 */
const unsigned int REQUEST_ENTITY_TOO_LARGE; /* REQUEST_ENTITY_TOO_LARGE_4_13, REQUEST_ENTITY_TOO_LARGE_413 */
const unsigned int UNSUPPORTED_MEDIA_TYPE; /* UNSUPPORTED_MEDIA_TYPE_4_15, UNSUPPORTED_MEDIA_TYPE_415 */
const unsigned int INTERNAL_SERVER_ERROR; /* INTERNAL_SERVER_ERROR_5_00, INTERNAL_SERVER_ERROR_500 */
const unsigned int NOT_IMPLEMENTED; /* NOT_IMPLEMENTED_5_01, NOT_IMPLEMENTED_501 */
const unsigned int BAD_GATEWAY; /* BAD_GATEWAY_5_02, BAD_GATEWAY_502 */
const unsigned int SERVICE_UNAVAILABLE; /* SERVICE_UNAVAILABLE_5_03, SERVICE_UNAVAILABLE_503 */
const unsigned int GATEWAY_TIMEOUT; /* GATEWAY_TIMEOUT_5_04, GATEWAY_TIMEOUT_504 */
const unsigned int PROXYING_NOT_SUPPORTED; /* PROXYING_NOT_SUPPORTED_5_05, INTERNAL_SERVER_ERROR_500 */
};
/**
* List of Content-Formats which are Internet Media Types plus encoding.
* TODO This should be a constant enum taken from CoAP for both CoAP and HTTP.
*/
struct rest_implementation_type {
unsigned int TEXT_PLAIN;
unsigned int TEXT_XML;
unsigned int TEXT_CSV;
unsigned int TEXT_HTML;
unsigned int IMAGE_GIF;
unsigned int IMAGE_JPEG;
unsigned int IMAGE_PNG;
unsigned int IMAGE_TIFF;
unsigned int AUDIO_RAW;
unsigned int VIDEO_RAW;
unsigned int APPLICATION_LINK_FORMAT;
unsigned int APPLICATION_XML;
unsigned int APPLICATION_OCTET_STREAM;
unsigned int APPLICATION_RDF_XML;
unsigned int APPLICATION_SOAP_XML;
unsigned int APPLICATION_ATOM_XML;
unsigned int APPLICATION_XMPP_XML;
unsigned int APPLICATION_EXI;
unsigned int APPLICATION_FASTINFOSET;
unsigned int APPLICATION_SOAP_FASTINFOSET;
unsigned int APPLICATION_JSON;
unsigned int APPLICATION_X_OBIX_BINARY;
};
/**
* Resource flags for allowed methods and special functionalities.
*/
typedef enum {
NO_FLAGS = 0,
/* methods to handle */
METHOD_GET = (1 << 0),
METHOD_POST = (1 << 1),
METHOD_PUT = (1 << 2),
METHOD_DELETE = (1 << 3),
/* special flags */
HAS_SUB_RESOURCES = (1 << 4),
IS_SEPARATE = (1 << 5),
IS_OBSERVABLE = (1 << 6),
IS_PERIODIC = (1 << 7)
} rest_resource_flags_t;
#endif /* REST_CONSTANTS_H_ */

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apps/rest-engine/rest-engine.c Executable file
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/*
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* An abstraction layer for RESTful Web services (Erbium).
* Inspired by RESTful Contiki by Dogan Yazar.
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <string.h>
#include <stdio.h>
#include "contiki.h"
#include "rest-engine.h"
#define DEBUG DEBUG_NONE
#include "net/uip-debug.h"
PROCESS(rest_engine_process, "REST Engine");
/*---------------------------------------------------------------------------*/
LIST(restful_services);
LIST(restful_periodic_services);
/*---------------------------------------------------------------------------*/
/*- REST Engine API ---------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* \brief Initializes and starts the REST Engine process
*
* This function must be called by server processes before any resources are
* registered through rest_activate_resource().
*/
void
rest_init_engine(void)
{
list_init(restful_services);
REST.set_service_callback(rest_invoke_restful_service);
/* Start the RESTful server implementation. */
REST.init();
/*Start REST engine process */
process_start(&rest_engine_process, NULL);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Makes a resource available under the given URI path
* \param resource A pointer to a resource implementation
* \param path The URI path string for this resource
*
* The resource implementation must be imported first using the
* extern keyword. The build system takes care of compiling every
* *.c file in the ./resources/ sub-directory (see example Makefile).
*/
void
rest_activate_resource(resource_t * resource, char *path)
{
resource->url = path;
list_add(restful_services, resource);
PRINTF("Activating: %s\n", resource->url);
/* Only add periodic resources with a periodic_handler and a period > 0. */
if(resource->flags & IS_PERIODIC && resource->periodic->periodic_handler
&& resource->periodic->period) {
PRINTF("Periodic resource: %p (%s)\n", resource->periodic,
resource->periodic->resource->url);
list_add(restful_periodic_services, resource->periodic);
}
}
/*---------------------------------------------------------------------------*/
/*- Internal API ------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
list_t
rest_get_resources(void)
{
return restful_services;
}
/*---------------------------------------------------------------------------*/
int
rest_invoke_restful_service(void *request, void *response, uint8_t * buffer,
uint16_t buffer_size, int32_t * offset)
{
uint8_t found = 0;
uint8_t allowed = 1;
resource_t *resource = NULL;
const char *url = NULL;
for(resource = (resource_t *) list_head(restful_services);
resource; resource = resource->next) {
/* if the web service handles that kind of requests and urls matches */
if((REST.get_url(request, &url) == strlen(resource->url)
|| (REST.get_url(request, &url) > strlen(resource->url)
&& (resource->flags & HAS_SUB_RESOURCES)))
&& strncmp(resource->url, url, strlen(resource->url)) == 0) {
found = 1;
rest_resource_flags_t method = REST.get_method_type(request);
PRINTF("/%s, method %u, resource->flags %u\n", resource->url,
(uint16_t) method, resource->flags);
if((method & METHOD_GET) && resource->get_handler != NULL) {
/* call handler function */
resource->get_handler(request, response, buffer, buffer_size, offset);
} else if((method & METHOD_POST) && resource->post_handler != NULL) {
/* call handler function */
resource->post_handler(request, response, buffer, buffer_size,
offset);
} else if((method & METHOD_PUT) && resource->put_handler != NULL) {
/* call handler function */
resource->put_handler(request, response, buffer, buffer_size, offset);
} else if((method & METHOD_DELETE) && resource->delete_handler != NULL) {
/* call handler function */
resource->delete_handler(request, response, buffer, buffer_size,
offset);
} else {
allowed = 0;
REST.set_response_status(response, REST.status.METHOD_NOT_ALLOWED);
}
break;
}
}
if(!found) {
REST.set_response_status(response, REST.status.NOT_FOUND);
} else if(allowed) {
/* final handler for special flags */
if(resource->flags & IS_OBSERVABLE) {
REST.subscription_handler(resource, request, response);
}
}
return found & allowed;
}
/*-----------------------------------------------------------------------------------*/
PROCESS_THREAD(rest_engine_process, ev, data)
{
PROCESS_BEGIN();
/* pause to let REST server finish adding resources. */
PROCESS_PAUSE();
/* initialize the PERIODIC_RESOURCE timers, which will be handled by this process. */
periodic_resource_t *periodic_resource = NULL;
for(periodic_resource =
(periodic_resource_t *) list_head(restful_periodic_services);
periodic_resource; periodic_resource = periodic_resource->next) {
if(periodic_resource->periodic_handler && periodic_resource->period) {
PRINTF("Periodic: Set timer for /%s to %lu\n",
periodic_resource->resource->url, periodic_resource->period);
etimer_set(&periodic_resource->periodic_timer,
periodic_resource->period);
}
}
while(1) {
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_TIMER) {
for(periodic_resource =
(periodic_resource_t *) list_head(restful_periodic_services);
periodic_resource; periodic_resource = periodic_resource->next) {
if(periodic_resource->period
&& etimer_expired(&periodic_resource->periodic_timer)) {
PRINTF("Periodic: etimer expired for /%s (period: %lu)\n",
periodic_resource->resource->url, periodic_resource->period);
/* Call the periodic_handler function, which was checked during adding to list. */
(periodic_resource->periodic_handler) ();
etimer_reset(&periodic_resource->periodic_timer);
}
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/

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