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GeezerVison is showing github.com — libhttpserver/src/resource_hook_table.cpp at master · etr/libhttpserver Expand file tree/ Copy pathresource_hook_table.cppMore file actions 289 lines (261 loc) · 10 KB / Copy pathresource_hook_table.cppFile metadata and controls289 lines (261 loc) · 10 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 /* This file is part of libhttpserver Copyright (C) 2011-2026 Sebastiano Merlino This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ // Out-of-line bodies for detail::resource_hook_table. // // Mirrors the fire_hooks_for_phase / fire_short_circuit_hooks_for_phase // templates in src/detail/hook_phase_dispatch.cpp, but the firing // helpers here are members on a per-resource table (not on // webserver_impl). // The lock discipline (snapshot under shared_lock, release, iterate) // is identical, so re-entrant add_hook / remove() calls from inside a // hook callback do not deadlock. #include "httpserver/detail/resource_hook_table.hpp" #include <array> #include <atomic> #include <cstddef> #include <cstdint> #include <exception> #include <functional> #include <mutex> #include <optional> #include <shared_mutex> #include <string> #include <string_view> #include <utility> #include <vector> #include "httpserver/hook_action.hpp" #include "httpserver/hook_context.hpp" #include "httpserver/hook_phase.hpp" #include "httpserver/http_response.hpp" namespace httpserver { namespace detail { namespace { // append_impl -- shared body for all five append_* methods. // Each public overload delegates here with its phase constant and // target vector. Mirrors the DRY pattern already applied to fire_* in // fire_short_circuit_impl / fire_void_impl below. template <hook_phase P, typename Sig> std::uint64_t append_impl( std::atomic<std::uint64_t>& next_slot_id, std::shared_mutex& mtx, std::vector<resource_hook_table::entry<Sig>>& vec, std::array<std::atomic<bool>, static_cast<std::size_t>(hook_phase::count_)>& any_hooks, std::function<Sig> fn) { const std::uint64_t id = next_slot_id.fetch_add(1, std::memory_order_relaxed); { std::unique_lock lock(mtx); vec.push_back({id, std::move(fn)}); any_hooks[static_cast<std::size_t>(P)] .store(true, std::memory_order_release); } return id; } // fire_short_circuit_impl -- shared dispatch for the three hook_action- // returning phases. Snapshots the vector, releases the lock, then // iterates. A short-circuit (action.is_pass() == false) abandons the // chain and returns the extracted response. template <typename Vec, typename Ctx> std::optional<::httpserver::http_response> fire_short_circuit_impl(std::shared_mutex& mtx, const Vec& hook_vec, Ctx& ctx, std::string_view phase_name, const resource_hook_table::log_fn& log) { Vec snapshot; try { { std::shared_lock lock(mtx); snapshot = hook_vec; } for (auto& e : snapshot) { try { auto action = e.fn(ctx); if (!action.is_pass()) { return std::move(action).take_response(); } } catch (const std::exception& ex) { if (log) { log(std::string("per-route hook[") + std::string(phase_name) + "] threw: " + ex.what()); } } catch (...) { if (log) { log(std::string("per-route hook[") + std::string(phase_name) + "] threw unknown exception"); } } } } catch (...) { if (log) { log(std::string("per-route fire_short_circuit[") + std::string(phase_name) + "]: snapshot copy failed"); } } return std::nullopt; } // fire_void_impl -- shared dispatch for the two void-returning phases. template <typename Vec, typename Ctx> void fire_void_impl(std::shared_mutex& mtx, const Vec& hook_vec, const Ctx& ctx, std::string_view phase_name, const resource_hook_table::log_fn& log) { Vec snapshot; try { { std::shared_lock lock(mtx); snapshot = hook_vec; } for (const auto& e : snapshot) { try { e.fn(ctx); } catch (const std::exception& ex) { if (log) { log(std::string("per-route hook[") + std::string(phase_name) + "] threw: " + ex.what()); } } catch (...) { if (log) { log(std::string("per-route hook[") + std::string(phase_name) + "] threw unknown exception"); } } } } catch (...) { if (log) { log(std::string("per-route fire_void[") + std::string(phase_name) + "]: snapshot copy failed"); } } } } // namespace // ---- append_* ----------------------------------------------------------- // Each public overload delegates to the shared append_impl<P> template // (see the anonymous namespace above). The only per-overload variation // is the hook_phase constant and the target vector. std::uint64_t resource_hook_table::append_before_handler( std::function<hook_action(before_handler_ctx&)> fn) { return append_impl<hook_phase::before_handler>( next_slot_id_, hook_table_mutex_, hooks_before_handler_, any_hooks_, std::move(fn)); } std::uint64_t resource_hook_table::append_handler_exception( std::function<hook_action(const handler_exception_ctx&)> fn) { return append_impl<hook_phase::handler_exception>( next_slot_id_, hook_table_mutex_, hooks_handler_exception_, any_hooks_, std::move(fn)); } std::uint64_t resource_hook_table::append_after_handler( std::function<hook_action(after_handler_ctx&)> fn) { return append_impl<hook_phase::after_handler>( next_slot_id_, hook_table_mutex_, hooks_after_handler_, any_hooks_, std::move(fn)); } std::uint64_t resource_hook_table::append_response_sent( std::function<void(const response_sent_ctx&)> fn) { return append_impl<hook_phase::response_sent>( next_slot_id_, hook_table_mutex_, hooks_response_sent_, any_hooks_, std::move(fn)); } std::uint64_t resource_hook_table::append_request_completed( std::function<void(const request_completed_ctx&)> fn) { return append_impl<hook_phase::request_completed>( next_slot_id_, hook_table_mutex_, hooks_request_completed_, any_hooks_, std::move(fn)); } // ---- remove_slot -------------------------------------------------------- void resource_hook_table::remove_slot( hook_phase phase, std::uint64_t slot_id) noexcept { std::unique_lock lock(hook_table_mutex_); auto erase_if_found = [slot_id](auto& vec) { for (auto it = vec.begin(); it != vec.end(); ++it) { if (it->slot_id == slot_id) { vec.erase(it); return; } } }; auto reset_if_empty = [&](const auto& vec) { if (vec.empty()) { any_hooks_[static_cast<std::size_t>(phase)] .store(false, std::memory_order_release); } }; switch (phase) { case hook_phase::before_handler: erase_if_found(hooks_before_handler_); reset_if_empty(hooks_before_handler_); break; case hook_phase::handler_exception: erase_if_found(hooks_handler_exception_); reset_if_empty(hooks_handler_exception_); break; case hook_phase::after_handler: erase_if_found(hooks_after_handler_); reset_if_empty(hooks_after_handler_); break; case hook_phase::response_sent: erase_if_found(hooks_response_sent_); reset_if_empty(hooks_response_sent_); break; case hook_phase::request_completed: erase_if_found(hooks_request_completed_); reset_if_empty(hooks_request_completed_); break; default: // The other six phases are never registered on a resource (the // public add_hook overloads reject them with std::invalid_argument // before reaching here). A defensive no-op for forward compat. break; } } // ---- fire_* ------------------------------------------------------------- std::optional<http_response> resource_hook_table::fire_before_handler( before_handler_ctx& ctx, const log_fn& log) { return fire_short_circuit_impl( hook_table_mutex_, hooks_before_handler_, ctx, "before_handler", log); } std::optional<http_response> resource_hook_table::fire_handler_exception( const handler_exception_ctx& ctx, const log_fn& log) { return fire_short_circuit_impl( hook_table_mutex_, hooks_handler_exception_, ctx, "handler_exception", log); } std::optional<http_response> resource_hook_table::fire_after_handler( after_handler_ctx& ctx, const log_fn& log) { return fire_short_circuit_impl( hook_table_mutex_, hooks_after_handler_, ctx, "after_handler", log); } void resource_hook_table::fire_response_sent( const response_sent_ctx& ctx, const log_fn& log) { fire_void_impl(hook_table_mutex_, hooks_response_sent_, ctx, "response_sent", log); } void resource_hook_table::fire_request_completed( const request_completed_ctx& ctx, const log_fn& log) { fire_void_impl(hook_table_mutex_, hooks_request_completed_, ctx, "request_completed", log); } } // namespace detail } // namespace httpserver |
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