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| -rw-r--r-- | src/command_executor.hh | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/command_executor.hh b/src/command_executor.hh new file mode 100644 index 0000000..4461d55 --- /dev/null +++ b/src/command_executor.hh @@ -0,0 +1,262 @@ +/** + * Copyright (c) 2015, 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. + */ + +#ifndef LNAV_COMMAND_EXECUTOR_H +#define LNAV_COMMAND_EXECUTOR_H + +#include <future> +#include <stack> +#include <string> + +#include <sqlite3.h> + +#include "base/auto_fd.hh" +#include "base/lnav.console.hh" +#include "bookmarks.hh" +#include "fmt/format.h" +#include "ghc/filesystem.hpp" +#include "help_text.hh" +#include "optional.hpp" +#include "shlex.resolver.hh" +#include "vis_line.hh" + +struct exec_context; +class attr_line_t; +class logline_value; +struct logline_value_vector; + +using sql_callback_t = int (*)(exec_context&, sqlite3_stmt*); +int sql_callback(exec_context& ec, sqlite3_stmt* stmt); + +using pipe_callback_t + = std::future<std::string> (*)(exec_context&, const std::string&, auto_fd&); + +using error_callback_t + = std::function<void(const lnav::console::user_message&)>; + +struct exec_context { + enum class perm_t { + READ_WRITE, + READ_ONLY, + }; + + using output_t = std::pair<FILE*, int (*)(FILE*)>; + + exec_context(logline_value_vector* line_values = nullptr, + sql_callback_t sql_callback = ::sql_callback, + pipe_callback_t pipe_callback = nullptr); + + bool is_read_write() const + { + return this->ec_perms == perm_t::READ_WRITE; + } + + bool is_read_only() const + { + return this->ec_perms == perm_t::READ_ONLY; + } + + exec_context& with_perms(perm_t perms) + { + this->ec_perms = perms; + return *this; + } + + void add_error_context(lnav::console::user_message& um); + + template<typename... Args> + Result<std::string, lnav::console::user_message> make_error( + fmt::string_view format_str, const Args&... args) + { + auto retval = lnav::console::user_message::error( + fmt::vformat(format_str, fmt::make_format_args(args...))); + + this->add_error_context(retval); + + return Err(retval); + } + + nonstd::optional<FILE*> get_output() + { + for (auto iter = this->ec_output_stack.rbegin(); + iter != this->ec_output_stack.rend(); + ++iter) + { + if (iter->second && (*iter->second).first) { + return (*iter->second).first; + } + } + + return nonstd::nullopt; + } + + void set_output(const std::string& name, FILE* file, int (*closer)(FILE*)); + + void clear_output(); + + struct source_guard { + source_guard(exec_context* context) : sg_context(context) {} + + source_guard(const source_guard&) = delete; + + source_guard(source_guard&& other) : sg_context(other.sg_context) + { + other.sg_context = nullptr; + } + + ~source_guard() + { + if (this->sg_context != nullptr) { + this->sg_context->ec_source.pop_back(); + } + } + + exec_context* sg_context; + }; + + struct output_guard { + explicit output_guard(exec_context& context, + std::string name = "default", + const nonstd::optional<output_t>& file + = nonstd::nullopt); + + ~output_guard(); + + exec_context& sg_context; + }; + + source_guard enter_source(intern_string_t path, + int line_number, + const std::string& content); + + struct error_cb_guard { + error_cb_guard(exec_context* context) : sg_context(context) {} + + error_cb_guard(const error_cb_guard&) = delete; + error_cb_guard(error_cb_guard&& other) : sg_context(other.sg_context) + { + other.sg_context = nullptr; + } + + ~error_cb_guard() + { + if (this->sg_context != nullptr) { + this->sg_context->ec_error_callback_stack.pop_back(); + } + } + + exec_context* sg_context; + }; + + error_cb_guard add_error_callback(error_callback_t cb) + { + this->ec_error_callback_stack.emplace_back(std::move(cb)); + return {this}; + } + + scoped_resolver create_resolver() + { + return { + &this->ec_local_vars.top(), + &this->ec_global_vars, + }; + } + + void execute(const std::string& cmdline); + + using kv_pair_t = std::pair<std::string, std::string>; + + void execute_with_int(const std::string& cmdline) + { + this->execute(cmdline); + } + + template<typename... Args> + void execute_with_int(const std::string& cmdline, + kv_pair_t pair, + Args... args) + { + this->ec_local_vars.top().template emplace(pair); + this->execute(cmdline, args...); + } + + template<typename... Args> + void execute_with(const std::string& cmdline, Args... args) + { + this->ec_local_vars.push({}); + this->execute_with_int(cmdline, args...); + this->ec_local_vars.pop(); + } + + vis_line_t ec_top_line{0_vl}; + bool ec_dry_run{false}; + perm_t ec_perms{perm_t::READ_WRITE}; + + std::map<std::string, std::string> ec_override; + logline_value_vector* ec_line_values; + std::stack<std::map<std::string, scoped_value_t>> ec_local_vars; + std::map<std::string, scoped_value_t> ec_global_vars; + std::vector<ghc::filesystem::path> ec_path_stack; + std::vector<lnav::console::snippet> ec_source; + help_text* ec_current_help{nullptr}; + + std::vector<std::pair<std::string, nonstd::optional<output_t>>> + ec_output_stack; + + std::unique_ptr<attr_line_t> ec_accumulator; + + sql_callback_t ec_sql_callback; + pipe_callback_t ec_pipe_callback; + std::vector<error_callback_t> ec_error_callback_stack; +}; + +Result<std::string, lnav::console::user_message> execute_command( + exec_context& ec, const std::string& cmdline); + +Result<std::string, lnav::console::user_message> execute_sql( + exec_context& ec, const std::string& sql, std::string& alt_msg); +Result<std::string, lnav::console::user_message> execute_file( + exec_context& ec, const std::string& path_and_args, bool multiline = true); +Result<std::string, lnav::console::user_message> execute_any( + exec_context& ec, const std::string& cmdline); +void execute_init_commands( + exec_context& ec, + std::vector<std::pair<Result<std::string, lnav::console::user_message>, + std::string>>& msgs); + +std::future<std::string> pipe_callback(exec_context& ec, + const std::string& cmdline, + auto_fd& fd); + +int sql_progress(const struct log_cursor& lc); +void sql_progress_finished(); + +void add_global_vars(exec_context& ec); + +#endif // LNAV_COMMAND_EXECUTOR_H |