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-rw-r--r--src/vtab_module.cc109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/vtab_module.cc b/src/vtab_module.cc
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+/**
+ * Copyright (c) 2017, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Timothy Stack 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 REGENTS 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 REGENTS 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.
+ */
+
+#include "vtab_module.hh"
+
+#include "config.h"
+#include "lnav_util.hh"
+#include "sqlitepp.hh"
+
+std::string vtab_module_schemas;
+
+std::map<intern_string_t, std::string> vtab_module_ddls;
+
+void
+to_sqlite(sqlite3_context* ctx, const lnav::console::user_message& um)
+{
+ auto errmsg = fmt::format(
+ FMT_STRING("{}{}"), sqlitepp::ERROR_PREFIX, lnav::to_json(um));
+
+ sqlite3_result_error(ctx, errmsg.c_str(), errmsg.size());
+}
+
+lnav::console::user_message
+sqlite3_error_to_user_message(sqlite3* db)
+{
+ const auto* errmsg = sqlite3_errmsg(db);
+ if (startswith(errmsg, sqlitepp::ERROR_PREFIX)) {
+ auto from_res = lnav::from_json<lnav::console::user_message>(
+ &errmsg[strlen(sqlitepp::ERROR_PREFIX)]);
+
+ if (from_res.isOk()) {
+ return from_res.unwrap();
+ }
+
+ return lnav::console::user_message::error("internal error")
+ .with_reason(from_res.unwrapErr()[0].um_message.get_string());
+ }
+
+ return lnav::console::user_message::error("SQL statement failed")
+ .with_reason(errmsg);
+}
+
+void
+vtab_index_usage::column_used(
+ const vtab_index_constraints::const_iterator& iter)
+{
+ this->viu_min_column = std::min(iter->iColumn, this->viu_min_column);
+ this->viu_max_column = std::max(iter->iColumn, this->viu_max_column);
+ this->viu_index_info.idxNum |= (1L << iter.i_index);
+ this->viu_used_column_count += 1;
+}
+
+void
+vtab_index_usage::allocate_args(int low, int high, int required)
+{
+ int n_arg = 0;
+
+ if (this->viu_min_column != low || this->viu_max_column > high
+ || this->viu_used_column_count < required)
+ {
+ this->viu_index_info.estimatedCost = 2147483647;
+ this->viu_index_info.estimatedRows = 2147483647;
+ return;
+ }
+
+ for (int lpc = 0; lpc <= this->viu_max_column; lpc++) {
+ for (int cons_index = 0; cons_index < this->viu_index_info.nConstraint;
+ cons_index++)
+ {
+ if (this->viu_index_info.aConstraint[cons_index].iColumn != lpc) {
+ continue;
+ }
+ if (!(this->viu_index_info.idxNum & (1L << cons_index))) {
+ continue;
+ }
+
+ this->viu_index_info.aConstraintUsage[cons_index].argvIndex
+ = ++n_arg;
+ }
+ }
+ this->viu_index_info.estimatedCost = 1.0;
+ this->viu_index_info.estimatedRows = 1;
+}