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229 lines
6.8 KiB
C++
229 lines
6.8 KiB
C++
/**
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* Copyright (c) 2014, Timothy Stack
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*
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack 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 REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file json-extension-functions.cc
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <string>
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#include "sqlite3.h"
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#include "json_op.hh"
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#include "sqlite-extension-func.h"
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using namespace std;
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class sql_json_op : public json_op {
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public:
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sql_json_op(json_ptr &ptr) : json_op(ptr), sjo_type(-1) { };
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int sjo_type;
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string sjo_str;
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int sjo_int;
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};
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static void printer(void *ctx, const char *numberVal, size_t numberLen)
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{
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string &str = *(string *)ctx;
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str.append(numberVal, numberLen);
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}
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static void null_or_default(sqlite3_context *context, int argc, sqlite3_value **argv)
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{
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if (argc > 2) {
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sqlite3_result_value(context, argv[2]);
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}
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else {
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sqlite3_result_null(context);
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}
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}
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static int gen_handle_null(void *ctx)
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{
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sql_json_op *sjo = (sql_json_op *)ctx;
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yajl_gen gen = (yajl_gen)sjo->jo_ptr_data;
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if (sjo->jo_ptr.jp_state == json_ptr::MS_DONE) {
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sjo->sjo_type = SQLITE_NULL;
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}
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else {
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sjo->jo_ptr_error_code = yajl_gen_null(gen);
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}
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return sjo->jo_ptr_error_code == yajl_gen_status_ok;
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}
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static int gen_handle_boolean(void *ctx, int boolVal)
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{
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sql_json_op *sjo = (sql_json_op *)ctx;
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yajl_gen gen = (yajl_gen)sjo->jo_ptr_data;
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if (sjo->jo_ptr.jp_state == json_ptr::MS_DONE) {
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sjo->sjo_type = SQLITE_INTEGER;
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sjo->sjo_int = boolVal;
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}
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else {
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sjo->jo_ptr_error_code = yajl_gen_bool(gen, boolVal);
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}
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return sjo->jo_ptr_error_code == yajl_gen_status_ok;
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}
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static int gen_handle_string(void *ctx, const unsigned char * stringVal, size_t len)
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{
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sql_json_op *sjo = (sql_json_op *)ctx;
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yajl_gen gen = (yajl_gen)sjo->jo_ptr_data;
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if (sjo->jo_ptr.jp_state == json_ptr::MS_DONE) {
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sjo->sjo_type = SQLITE3_TEXT;
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sjo->sjo_str = string((char *)stringVal, len);
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}
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else {
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sjo->jo_ptr_error_code = yajl_gen_string(gen, stringVal, len);
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}
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return sjo->jo_ptr_error_code == yajl_gen_status_ok;
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}
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static void sql_jget(sqlite3_context *context,
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int argc, sqlite3_value **argv)
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{
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if (argc < 2) {
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sqlite3_result_error(context, "expecting JSON value and pointer", -1);
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return;
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}
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if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
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null_or_default(context, argc, argv);
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return;
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}
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const char *json_in = (const char *)sqlite3_value_text(argv[0]);
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if (sqlite3_value_type(argv[1]) == SQLITE_NULL) {
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sqlite3_result_text(context, json_in, -1, SQLITE_TRANSIENT);
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return;
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}
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const char *ptr_in = (const char *)sqlite3_value_text(argv[1]);
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json_ptr jp(ptr_in);
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sql_json_op jo(jp);
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auto_mem<yajl_gen_t> gen(yajl_gen_free);
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auto_mem<yajl_handle_t> handle(yajl_free);
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const unsigned char *err;
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string result;
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gen = yajl_gen_alloc(NULL);
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yajl_gen_config(gen.in(), yajl_gen_print_callback, printer, &result);
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yajl_gen_config(gen.in(), yajl_gen_beautify, false);
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jo.jo_ptr_callbacks = json_op::gen_callbacks;
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jo.jo_ptr_callbacks.yajl_null = gen_handle_null;
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jo.jo_ptr_callbacks.yajl_boolean = gen_handle_boolean;
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jo.jo_ptr_callbacks.yajl_string = gen_handle_string;
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jo.jo_ptr_data = gen.in();
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handle.reset(yajl_alloc(&json_op::ptr_callbacks, NULL, &jo));
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switch (yajl_parse(handle.in(), (const unsigned char *)json_in, strlen(json_in))) {
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case yajl_status_error:
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err = yajl_get_error(handle.in(), 0, (const unsigned char *)json_in, strlen(json_in));
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sqlite3_result_error(context, (const char *)err, -1);
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return;
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case yajl_status_client_canceled:
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if (jo.jo_ptr.jp_state == json_ptr::MS_ERR_INVALID_ESCAPE) {
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sqlite3_result_error(context, jo.jo_ptr.error_msg().c_str(), -1);
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}
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else {
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null_or_default(context, argc, argv);
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}
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return;
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default:
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break;
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}
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switch (yajl_complete_parse(handle.in())) {
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case yajl_status_error:
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err = yajl_get_error(handle.in(), 0, (const unsigned char *)json_in, strlen(json_in));
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sqlite3_result_error(context, (const char *)err, -1);
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return;
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case yajl_status_client_canceled:
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if (jo.jo_ptr.jp_state == json_ptr::MS_ERR_INVALID_ESCAPE) {
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sqlite3_result_error(context, jo.jo_ptr.error_msg().c_str(), -1);
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}
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else {
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null_or_default(context, argc, argv);
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}
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return;
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default:
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break;
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}
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switch (jo.sjo_type) {
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case SQLITE3_TEXT:
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sqlite3_result_text(context, jo.sjo_str.c_str(), jo.sjo_str.size(), SQLITE_TRANSIENT);
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return;
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case SQLITE_NULL:
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sqlite3_result_null(context);
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return;
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case SQLITE_INTEGER:
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sqlite3_result_int(context, jo.sjo_int);
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return;
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}
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if (result.empty()) {
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null_or_default(context, argc, argv);
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return;
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}
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sqlite3_result_text(context, result.c_str(), result.size(), SQLITE_TRANSIENT);
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}
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int json_extension_functions(const struct FuncDef **basic_funcs,
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const struct FuncDefAgg **agg_funcs)
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{
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static const struct FuncDef fs_funcs[] = {
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{ "jget", -1, 0, SQLITE_UTF8, 0, sql_jget },
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{ NULL }
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};
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*basic_funcs = fs_funcs;
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*agg_funcs = NULL;
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return SQLITE_OK;
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}
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