plugins/protocol_fulltext_demo.c - platform/external/libwebsockets - Gitiles

 /*
  * ws protocol handler plugin for "fulltext demo"
  *
  * Written in 2010-2019 by Andy Green <andy@warmcat.com>
  *
  * This file is made available under the Creative Commons CC0 1.0
  * Universal Public Domain Dedication.
  *
  * The person who associated a work with this deed has dedicated
  * the work to the public domain by waiving all of his or her rights
  * to the work worldwide under copyright law, including all related
  * and neighboring rights, to the extent allowed by law. You can copy,
  * modify, distribute and perform the work, even for commercial purposes,
  * all without asking permission.
  *
  * These test plugins are intended to be adapted for use in your code, which
  * may be proprietary.  So unlike the library itself, they are licensed
  * Public Domain.
  */

 #if !defined (LWS_PLUGIN_STATIC)
 #if !defined(LWS_DLL)
 #define LWS_DLL
 #endif
 #if !defined(LWS_INTERNAL)
 #define LWS_INTERNAL
 #endif
 #include <libwebsockets.h>
 #endif

 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef WIN32
 #include <io.h>
 #endif
 #include <stdio.h>

 struct vhd_fts_demo {
 	const char *indexpath;
 };

 struct pss_fts_demo {
 	struct lwsac *result;
 	struct lws_fts_result_autocomplete *ac;
 	struct lws_fts_result_filepath *fp;

 	uint32_t *li;
 	int done;

 	uint8_t first:1;
 	uint8_t ac_done:1;

 	uint8_t fp_init_done:1;
 };

 static int
 callback_fts(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 	     void *in, size_t len)
 {
 	struct vhd_fts_demo *vhd = (struct vhd_fts_demo *)
 		lws_protocol_vh_priv_get(lws_get_vhost(wsi),
 					 lws_get_protocol(wsi));
 	struct pss_fts_demo *pss = (struct pss_fts_demo *)user;
 	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
 		*end = &buf[sizeof(buf) - LWS_PRE - 1];
 	struct lws_fts_search_params params;
 	const char *ccp = (const char *)in;
 	struct lws_fts_result *result;
 	struct lws_fts_file *jtf;
 	int n;

 	switch (reason) {

 	case LWS_CALLBACK_PROTOCOL_INIT:
 		vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
 			     lws_get_protocol(wsi),sizeof(struct vhd_fts_demo));
 		if (!vhd)
 			return 0;
 		if (lws_pvo_get_str(in, "indexpath",
 				    (const char **)&vhd->indexpath))
 			return 1;

 		return 0;

 	case LWS_CALLBACK_HTTP:

 		pss->first = 1;
 		pss->ac_done = 0;

 		/*
 		 * we have a "subdirectory" selecting the task
 		 *
 		 * /a/ = autocomplete
 		 * /r/ = results
 		 */

 		if (strncmp(ccp, "/a/", 3) && strncmp(ccp, "/r/", 3))
 			goto reply_404;

 		memset(&params, 0, sizeof(params));

 		params.needle = ccp + 3;
 		if (*(ccp + 1) == 'a')
 			params.flags = LWSFTS_F_QUERY_AUTOCOMPLETE;
 		if (*(ccp + 1) == 'r')
 			params.flags = LWSFTS_F_QUERY_FILES |
 				       LWSFTS_F_QUERY_FILE_LINES |
 				       LWSFTS_F_QUERY_QUOTE_LINE;
 		params.max_autocomplete = 10;
 		params.max_files = 10;

 		jtf = lws_fts_open(vhd->indexpath);
 		if (!jtf) {
 			lwsl_err("unable to open %s\n", vhd->indexpath);
 			/* we'll inform the client in the JSON */
 			goto reply_200;
 		}

 		result = lws_fts_search(jtf, &params);
 		lws_fts_close(jtf);
 		if (result) {
 			pss->result = params.results_head;
 			pss->ac = result->autocomplete_head;
 			pss->fp = result->filepath_head;
 		}
 		/* NULL result will be told in the json as "indexed": 0 */

 reply_200:
 		if (lws_add_http_common_headers(wsi, HTTP_STATUS_OK,
 						"text/html",
 					LWS_ILLEGAL_HTTP_CONTENT_LEN, &p, end))
 			return 1;

 		if (lws_finalize_write_http_header(wsi, start, &p, end))
 			return 1;

 		lws_callback_on_writable(wsi);
 		return 0;

 reply_404:
 		if (lws_add_http_common_headers(wsi, HTTP_STATUS_NOT_FOUND,
 						"text/html",
 					LWS_ILLEGAL_HTTP_CONTENT_LEN, &p, end))
 			return 1;

 		if (lws_finalize_write_http_header(wsi, start, &p, end))
 			return 1;
 		return lws_http_transaction_completed(wsi);

 	case LWS_CALLBACK_CLOSED_HTTP:
 		if (pss && pss->result)
 			lwsac_free(&pss->result);
 		break;

 	case LWS_CALLBACK_HTTP_WRITEABLE:

 		if (!pss)
 			break;

 		n = LWS_WRITE_HTTP;
 		if (pss->first)
 			p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
 				"{\"indexed\": %d, \"ac\": [", !!pss->result);

 		while (pss->ac && lws_ptr_diff(end, p) > 256) {
 			p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
 				"%c{\"ac\": \"%s\",\"matches\": %d,"
 				"\"agg\": %d, \"elided\": %d}",
 				pss->first ? ' ' : ',', (char *)(pss->ac + 1),
 				pss->ac->instances, pss->ac->agg_instances,
 				pss->ac->elided);

 			pss->first = 0;
 			pss->ac = pss->ac->next;
 		}

 		if (!pss->ac_done && !pss->ac && pss->fp) {
 			pss->ac_done = 1;

 			p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
 					  "], \"fp\": [");
 		}

 		while (pss->fp && lws_ptr_diff_size_t(end, p) > 256) {
 			if (!pss->fp_init_done) {
 				p += lws_snprintf((char *)p,
 						lws_ptr_diff_size_t(end, p),
 					"%c{\"path\": \"%s\",\"matches\": %d,"
 					"\"origlines\": %d,"
 					"\"hits\": [", pss->first ? ' ' : ',',
 					((char *)(pss->fp + 1)) +
 						pss->fp->matches_length,
 					pss->fp->matches,
 					pss->fp->lines_in_file);

 				pss->li = ((uint32_t *)(pss->fp + 1));
 				pss->done = 0;
 				pss->fp_init_done = 1;
 				pss->first = 0;
 			} else {
 				while (pss->done < pss->fp->matches &&
 				       lws_ptr_diff(end, p) > 256) {

 					p += lws_snprintf((char *)p,
 							lws_ptr_diff_size_t(end, p),
 						"%c\n{\"l\":%d,\"o\":%d,"
 						"\"s\":\"%s\"}",
 						!pss->done ? ' ' : ',',
 						pss->li[0], pss->li[1],
 						*((const char **)&pss->li[2]));
 					pss->li += 2 + (sizeof(const char *) /
 							sizeof(uint32_t));
 					pss->done++;
 				}

 				if (pss->done == pss->fp->matches) {
 					*p++ = ']';
 					pss->fp_init_done = 0;
 					pss->fp = pss->fp->next;
 					if (!pss->fp)
 						*p++ = '}';
 				}
 			}
 		}

 		if (!pss->ac && !pss->fp) {
 			n = LWS_WRITE_HTTP_FINAL;
 			p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
 						"]}");
 		}

 		if (lws_write(wsi, (uint8_t *)start,
 				lws_ptr_diff_size_t(p, start), (enum lws_write_protocol)n) !=
 					      lws_ptr_diff(p, start))
 			return 1;

 		if (n == LWS_WRITE_HTTP_FINAL) {
 			if (pss->result)
 				lwsac_free(&pss->result);
 			if (lws_http_transaction_completed(wsi))
 				return -1;
 		} else
 			lws_callback_on_writable(wsi);

 		return 0;

 	default:
 		break;
 	}

 	return lws_callback_http_dummy(wsi, reason, user, in, len);
 }


 #define LWS_PLUGIN_PROTOCOL_FULLTEXT_DEMO \
 	{ \
 		"lws-test-fts", \
 		callback_fts, \
 		sizeof(struct pss_fts_demo), \
 		0, \
 		0, NULL, 0 \
 	}

 #if !defined (LWS_PLUGIN_STATIC)

 LWS_VISIBLE const struct lws_protocols fulltext_demo_protocols[] = {
 	LWS_PLUGIN_PROTOCOL_FULLTEXT_DEMO
 };

 LWS_VISIBLE const lws_plugin_protocol_t fulltext_demo = {
 	.hdr = {
 		"fulltext demo",
 		"lws_protocol_plugin",
 		LWS_BUILD_HASH,
 		LWS_PLUGIN_API_MAGIC
 	},

 	.protocols = fulltext_demo_protocols,
 	.count_protocols = LWS_ARRAY_SIZE(fulltext_demo_protocols),
 	.extensions = NULL,
 	.count_extensions = 0,
 };

 #endif
	/*
	* ws protocol handler plugin for "fulltext demo"
	*
	* Written in 2010-2019 by Andy Green <andy@warmcat.com>
	*
	* This file is made available under the Creative Commons CC0 1.0
	* Universal Public Domain Dedication.
	*
	* The person who associated a work with this deed has dedicated
	* the work to the public domain by waiving all of his or her rights
	* to the work worldwide under copyright law, including all related
	* and neighboring rights, to the extent allowed by law. You can copy,
	* modify, distribute and perform the work, even for commercial purposes,
	* all without asking permission.
	*
	* These test plugins are intended to be adapted for use in your code, which
	* may be proprietary. So unlike the library itself, they are licensed
	* Public Domain.
	*/

	#if !defined (LWS_PLUGIN_STATIC)
	#if !defined(LWS_DLL)
	#define LWS_DLL
	#endif
	#if !defined(LWS_INTERNAL)
	#define LWS_INTERNAL
	#endif
	#include <libwebsockets.h>
	#endif

	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#ifdef WIN32
	#include <io.h>
	#endif
	#include <stdio.h>

	struct vhd_fts_demo {
	const char *indexpath;
	};

	struct pss_fts_demo {
	struct lwsac *result;
	struct lws_fts_result_autocomplete *ac;
	struct lws_fts_result_filepath *fp;

	uint32_t *li;
	int done;

	uint8_t first:1;
	uint8_t ac_done:1;

	uint8_t fp_init_done:1;
	};

	static int
	callback_fts(struct lws wsi, enum lws_callback_reasons reason, void user,
	void *in, size_t len)
	{
	struct vhd_fts_demo vhd = (struct vhd_fts_demo )
	lws_protocol_vh_priv_get(lws_get_vhost(wsi),
	lws_get_protocol(wsi));
	struct pss_fts_demo pss = (struct pss_fts_demo )user;
	uint8_t buf[LWS_PRE + 2048], start = &buf[LWS_PRE], p = start,
	*end = &buf[sizeof(buf) - LWS_PRE - 1];
	struct lws_fts_search_params params;
	const char ccp = (const char )in;
	struct lws_fts_result *result;
	struct lws_fts_file *jtf;
	int n;

	switch (reason) {

	case LWS_CALLBACK_PROTOCOL_INIT:
	vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
	lws_get_protocol(wsi),sizeof(struct vhd_fts_demo));
	if (!vhd)
	return 0;
	if (lws_pvo_get_str(in, "indexpath",
	(const char **)&vhd->indexpath))
	return 1;

	return 0;

	case LWS_CALLBACK_HTTP:

	pss->first = 1;
	pss->ac_done = 0;

	/*
	* we have a "subdirectory" selecting the task
	*
	* /a/ = autocomplete
	* /r/ = results
	*/

	if (strncmp(ccp, "/a/", 3) && strncmp(ccp, "/r/", 3))
	goto reply_404;

	memset(&params, 0, sizeof(params));

	params.needle = ccp + 3;
	if (*(ccp + 1) == 'a')
	params.flags = LWSFTS_F_QUERY_AUTOCOMPLETE;
	if (*(ccp + 1) == 'r')
	params.flags = LWSFTS_F_QUERY_FILES \|
	LWSFTS_F_QUERY_FILE_LINES \|
	LWSFTS_F_QUERY_QUOTE_LINE;
	params.max_autocomplete = 10;
	params.max_files = 10;

	jtf = lws_fts_open(vhd->indexpath);
	if (!jtf) {
	lwsl_err("unable to open %s\n", vhd->indexpath);
	/* we'll inform the client in the JSON */
	goto reply_200;
	}

	result = lws_fts_search(jtf, &params);
	lws_fts_close(jtf);
	if (result) {
	pss->result = params.results_head;
	pss->ac = result->autocomplete_head;
	pss->fp = result->filepath_head;
	}
	/* NULL result will be told in the json as "indexed": 0 */

	reply_200:
	if (lws_add_http_common_headers(wsi, HTTP_STATUS_OK,
	"text/html",
	LWS_ILLEGAL_HTTP_CONTENT_LEN, &p, end))
	return 1;

	if (lws_finalize_write_http_header(wsi, start, &p, end))
	return 1;

	lws_callback_on_writable(wsi);
	return 0;

	reply_404:
	if (lws_add_http_common_headers(wsi, HTTP_STATUS_NOT_FOUND,
	"text/html",
	LWS_ILLEGAL_HTTP_CONTENT_LEN, &p, end))
	return 1;

	if (lws_finalize_write_http_header(wsi, start, &p, end))
	return 1;
	return lws_http_transaction_completed(wsi);

	case LWS_CALLBACK_CLOSED_HTTP:
	if (pss && pss->result)
	lwsac_free(&pss->result);
	break;

	case LWS_CALLBACK_HTTP_WRITEABLE:

	if (!pss)
	break;

	n = LWS_WRITE_HTTP;
	if (pss->first)
	p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
	"{\"indexed\": %d, \"ac\": [", !!pss->result);

	while (pss->ac && lws_ptr_diff(end, p) > 256) {
	p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
	"%c{\"ac\": \"%s\",\"matches\": %d,"
	"\"agg\": %d, \"elided\": %d}",
	pss->first ? ' ' : ',', (char *)(pss->ac + 1),
	pss->ac->instances, pss->ac->agg_instances,
	pss->ac->elided);

	pss->first = 0;
	pss->ac = pss->ac->next;
	}

	if (!pss->ac_done && !pss->ac && pss->fp) {
	pss->ac_done = 1;

	p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
	"], \"fp\": [");
	}

	while (pss->fp && lws_ptr_diff_size_t(end, p) > 256) {
	if (!pss->fp_init_done) {
	p += lws_snprintf((char *)p,
	lws_ptr_diff_size_t(end, p),
	"%c{\"path\": \"%s\",\"matches\": %d,"
	"\"origlines\": %d,"
	"\"hits\": [", pss->first ? ' ' : ',',
	((char *)(pss->fp + 1)) +
	pss->fp->matches_length,
	pss->fp->matches,
	pss->fp->lines_in_file);

	pss->li = ((uint32_t *)(pss->fp + 1));
	pss->done = 0;
	pss->fp_init_done = 1;
	pss->first = 0;
	} else {
	while (pss->done < pss->fp->matches &&
	lws_ptr_diff(end, p) > 256) {

	p += lws_snprintf((char *)p,
	lws_ptr_diff_size_t(end, p),
	"%c\n{\"l\":%d,\"o\":%d,"
	"\"s\":\"%s\"}",
	!pss->done ? ' ' : ',',
	pss->li[0], pss->li[1],
	((const char *)&pss->li[2]));
	pss->li += 2 + (sizeof(const char *) /
	sizeof(uint32_t));
	pss->done++;
	}

	if (pss->done == pss->fp->matches) {
	*p++ = ']';
	pss->fp_init_done = 0;
	pss->fp = pss->fp->next;
	if (!pss->fp)
	*p++ = '}';
	}
	}
	}

	if (!pss->ac && !pss->fp) {
	n = LWS_WRITE_HTTP_FINAL;
	p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
	"]}");
	}

	if (lws_write(wsi, (uint8_t *)start,
	lws_ptr_diff_size_t(p, start), (enum lws_write_protocol)n) !=
	lws_ptr_diff(p, start))
	return 1;

	if (n == LWS_WRITE_HTTP_FINAL) {
	if (pss->result)
	lwsac_free(&pss->result);
	if (lws_http_transaction_completed(wsi))
	return -1;
	} else
	lws_callback_on_writable(wsi);

	return 0;

	default:
	break;
	}

	return lws_callback_http_dummy(wsi, reason, user, in, len);
	}


	#define LWS_PLUGIN_PROTOCOL_FULLTEXT_DEMO \
	{ \
	"lws-test-fts", \
	callback_fts, \
	sizeof(struct pss_fts_demo), \
	0, \
	0, NULL, 0 \
	}

	#if !defined (LWS_PLUGIN_STATIC)

	LWS_VISIBLE const struct lws_protocols fulltext_demo_protocols[] = {
	LWS_PLUGIN_PROTOCOL_FULLTEXT_DEMO
	};

	LWS_VISIBLE const lws_plugin_protocol_t fulltext_demo = {
	.hdr = {
	"fulltext demo",
	"lws_protocol_plugin",
	LWS_BUILD_HASH,
	LWS_PLUGIN_API_MAGIC
	},

	.protocols = fulltext_demo_protocols,
	.count_protocols = LWS_ARRAY_SIZE(fulltext_demo_protocols),
	.extensions = NULL,
	.count_extensions = 0,
	};

	#endif