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/* * Copyright (c) 2015, 2023, Oracle and/or its affiliates. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2.0, * as published by the Free Software Foundation. * * This program is also distributed with certain software (including * but not limited to OpenSSL) that is licensed under separate terms, * as designated in a particular file or component or in included license * documentation. The authors of MySQL hereby grant you an additional * permission to link the program and your derivative works with the * separately licensed software that they have included with MySQL. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License, version 2.0, for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include "expect.h" #include "xpl_error.h" #include "ngs_common/protocol_protobuf.h" //#include "expect_gtid.h" using namespace xpl; // :docnote: // NO_ERROR means "enable exceptions", meaning any error that happens inside a block // will cause all subsequent statements to fail until the matching close is found. // // Nesting behaviour: // // Case 1: No_error // // open(NO_ERROR) - ok // stmt1 - ok // stmt2 - error // stmt3 - fail // close() - fail // // Case 2: Plain // // open() - ok // stmt1 - ok // stmt2 - error // stmt3 - ok // close() - ok // // Case 3: No_error nested within no_error // // 3.1: error in outer block fails the whole thing // open(NO_ERROR) - ok // stmt1 - error // open(NO_ERROR) - fail // stmt2 - fail // close() - fail // stmt3 - fail // close() - fail // // 3.2: error propagates up and fails the outer block // open(NO_ERROR) - ok // stmt1 - ok // open(NO_ERROR) - ok // stmt2 - error // close() - fail // stmt3 - fail // close() - fail // // Case 4: Plain nested within no_error // // 4.1: same as 3.1 // open(NO_ERROR) - ok // stmt1 - error // open() - fail // stmt2 - fail // close() - fail // stmt3 - fail // close() - fail // // 4.2: plain block effectively "catches" the error and prevents it from failing the outer block // open(NO_ERROR) - ok // stmt1 - ok // open() - ok // stmt2 - error // close() - ok // stmt3 - ok // close() - ok // // Case 5: No_error nested within Plain // // 5.1: trivial // open() - ok // stmt1 - error // open(NO_ERROR) - ok // stmt2 - ok // close() - ok // stmt3 - ok // close() - ok // // 5.2: error propagates up, but is ignored by the outer block // open() - ok // stmt1 - ok // open(NO_ERROR) - ok // stmt2 - error // close() - fail // stmt3 - ok // close() - ok // // Case 6: Plain nested within plain: trivial, behaves like a flat plain block // static const unsigned EXPECT_NO_ERROR = 1; //static const int EXPECT_SCHEMA_VERSION = 2; // not supported yet //static const int EXPECT_GTID_EXECUTED_CONTAINS = 3; //static const int EXPECT_GTID_WAIT_LESS_THAN = 4; // if (pre_client_stmt(msgid)) // { // error = ExecuteCommand() // post_client_stmt(msgid, error) // } Expectation::Expectation(const Expectation &other) : m_failed(other.m_failed), m_fail_on_error(other.m_fail_on_error), m_gtid_wait_less_than(0) // this is instance specific data, don't copy it { for (std::list<Expect_condition*>::const_iterator cond = other.m_conditions.begin(); cond != other.m_conditions.end(); ++cond) { m_conditions.push_back((*cond)->copy()); } } void Expectation::swap(Expectation &one, Expectation &other) { using std::swap; swap(one.m_failed, other.m_failed); swap(one.m_fail_on_error, other.m_fail_on_error); swap(one.m_conditions, other.m_conditions); } Expectation &Expectation::operator =(const Expectation &other) { Expectation tmp(other); swap(*this, tmp); return *this; } Expectation::~Expectation() { for (std::list<Expect_condition*>::iterator cond = m_conditions.begin(); cond != m_conditions.end(); ++cond) delete *cond; } ngs::Error_code Expectation::check() { for (std::list<Expect_condition*>::const_iterator cond = m_conditions.begin(); cond != m_conditions.end(); ++cond) { ngs::Error_code error((*cond)->check()); if (error) return error; } return ngs::Error_code(); } void Expectation::unset(uint32_t key) { if (key == EXPECT_NO_ERROR) { m_fail_on_error = false; return; } for (std::list<Expect_condition*>::iterator cond = m_conditions.begin(); cond != m_conditions.end(); ++cond) { if ((*cond)->key() == key) { delete *cond; m_conditions.erase(cond); break; } } } void Expectation::add_condition(Expect_condition *cond) { m_conditions.push_back(cond); } ngs::Error_code Expectation::set(uint32_t key, const std::string &value) { switch (key) { case EXPECT_NO_ERROR: if (value == "1" || value.empty()) m_fail_on_error = true; else if (value == "0") m_fail_on_error = false; else return ngs::Error_code(ER_X_EXPECT_BAD_CONDITION_VALUE, "Invalid value '"+value+"' for expectation no_error"); break; /* case EXPECT_GTID_EXECUTED_CONTAINS: { Expect_gtid *gtid; add_condition(gtid = new Expect_gtid(value)); gtid->set_key(key); // timeout was set first if (m_gtid_wait_less_than > 0) gtid->set_timeout(m_gtid_wait_less_than); break; } case EXPECT_GTID_WAIT_LESS_THAN: m_gtid_wait_less_than = ngs::stoi(value); for (std::list<Expect_condition*>::iterator cond = m_conditions.begin(); cond != m_conditions.end(); ++cond) { if ((*cond)->key() == EXPECT_GTID_EXECUTED_CONTAINS) { static_cast<Expect_gtid*>(*cond)->set_timeout(m_gtid_wait_less_than); break; } } break; */ default: return ngs::Error_code(ER_X_EXPECT_BAD_CONDITION, "Unknown condition key"); } return ngs::Error_code(); } Expectation_stack::Expectation_stack() { m_expect_stack.reserve(4); } ngs::Error_code Expectation_stack::open(const Mysqlx::Expect::Open &open) { ngs::Error_code error; Expectation expect; // if we're in a failed expect block, push an empty failed expectation to the stack // so that it can be popped when the matching close is seen. // No other evaluations are done in a failed state. if (!m_expect_stack.empty()) { if (m_expect_stack.back().failed()) { expect.set_failed(m_expect_stack.back().failed_condition()); m_expect_stack.push_back(expect); return ngs::Error_code(ER_X_EXPECT_FAILED, "Expectation failed: "+expect.failed_condition()); } if (open.op() == Mysqlx::Expect::Open::EXPECT_CTX_COPY_PREV) expect = m_expect_stack.back(); } for (int i = 0; i < open.cond_size(); i++) { const Mysqlx::Expect::Open::Condition &cond(open.cond(i)); switch (cond.op()) { case Mysqlx::Expect::Open::Condition::EXPECT_OP_SET: if (!cond.has_condition_value()) error = expect.set(cond.condition_key(), ""); else error = expect.set(cond.condition_key(), cond.condition_value()); break; case Mysqlx::Expect::Open::Condition::EXPECT_OP_UNSET: expect.unset(cond.condition_key()); break; } if (error) return error; } // we need to add the expectation block even if an error occurred, // otherwise we'll get mismatched open/close blocks // on_error should get called afterwards with this error, which should fail the rest of the block m_expect_stack.push_back(expect); // now check for the expected conditions // this may block if a blocking condition is found if (!error) error = expect.check(); return error; } ngs::Error_code Expectation_stack::close() { if (m_expect_stack.empty()) return ngs::Error_code(ER_X_EXPECT_NOT_OPEN, "Expect block currently not open"); if (m_expect_stack.back().failed()) { std::string cond = m_expect_stack.back().failed_condition(); m_expect_stack.pop_back(); return ngs::Error_code(ER_X_EXPECT_FAILED, "Expectation failed: " + cond); } m_expect_stack.pop_back(); return ngs::Error_code(); } // called before executing client statements ngs::Error_code Expectation_stack::pre_client_stmt(int8_t msgid) { if (!m_expect_stack.empty()) { if (m_expect_stack.back().failed()) { // special handling for nested expect blocks // if a block open or close arrives in a failed state, we let it through // so that they can be pushed/popped on the stack and properly accounted for if (msgid != Mysqlx::ClientMessages::EXPECT_OPEN && msgid != Mysqlx::ClientMessages::EXPECT_CLOSE) return ngs::Error_code(ER_X_EXPECT_FAILED, "Expectation failed: " + m_expect_stack.back().failed_condition()); } } return ngs::Error_code(); } // called after executing client statements void Expectation_stack::post_client_stmt(int8_t msgid, const ngs::Error_code &error) { if (error && !m_expect_stack.empty() && m_expect_stack.back().fail_on_error()) m_expect_stack.back().set_failed("no_error"); }