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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Cache\Adapter; |
| 16 | |
| 17 | use Pop\Cache\Clock; |
| 18 | |
| 19 | /** |
| 20 | * Memcached cache adapter class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Cache |
| 24 | * @author Nick Sagona, III <nick@popphp.org> |
| 25 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 26 | * @license https://www.popphp.org/license New BSD License |
| 27 | * @version 5.0.0 |
| 28 | */ |
| 29 | class Memcached extends AbstractAdapter |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * Traits |
| 34 | */ |
| 35 | use NamespacedVersionedKeys; |
| 36 | |
| 37 | /** |
| 38 | * Memcached object |
| 39 | * @var ?\Memcached |
| 40 | */ |
| 41 | protected ?\Memcached $memcached = null; |
| 42 | |
| 43 | /** |
| 44 | * Memcached version |
| 45 | * @var ?string |
| 46 | */ |
| 47 | protected ?string $version = null; |
| 48 | |
| 49 | /** |
| 50 | * Cache namespace |
| 51 | * @var string |
| 52 | */ |
| 53 | protected string $namespace = 'pop_cache'; |
| 54 | |
| 55 | /** |
| 56 | * Constructor |
| 57 | * |
| 58 | * Instantiate the memcached cache object |
| 59 | * |
| 60 | * @param int $ttl |
| 61 | * @param string $host |
| 62 | * @param int $port |
| 63 | * @param int $weight |
| 64 | * @param string $namespace |
| 65 | * @param Clock\ClockInterface $clock |
| 66 | * @throws Exception |
| 67 | */ |
| 68 | public function __construct( |
| 69 | int $ttl = 0, string $host = 'localhost', int $port = 11211, int $weight = 1, |
| 70 | string $namespace = 'pop_cache', Clock\ClockInterface $clock = new Clock\SystemClock() |
| 71 | ) |
| 72 | { |
| 73 | parent::__construct($ttl, $clock); |
| 74 | if (!class_exists('Memcached', false)) { |
| 75 | throw new Exception('Error: Memcached is not available.'); |
| 76 | } |
| 77 | |
| 78 | $this->namespace = $namespace; |
| 79 | $this->memcached = new \Memcached(); |
| 80 | $this->memcached->setOption(\Memcached::OPT_BINARY_PROTOCOL, true); |
| 81 | $this->addServer($host, $port, $weight); |
| 82 | |
| 83 | $version = $this->memcached->getVersion(); |
| 84 | if (isset($version[$host . ':' . $port])) { |
| 85 | $this->version = $version[$host . ':' . $port]; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Get the memcached object. |
| 91 | * |
| 92 | * @return \Memcached |
| 93 | */ |
| 94 | public function memcached(): \Memcached |
| 95 | { |
| 96 | return $this->memcached; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Get the current version of memcached. |
| 101 | * |
| 102 | * @param string $host |
| 103 | * @param int $port |
| 104 | * @param int $weight |
| 105 | * @return Memcached |
| 106 | */ |
| 107 | public function addServer(string $host, int $port = 11211, int $weight = 1): Memcached |
| 108 | { |
| 109 | $this->memcached->addServer($host, $port, $weight); |
| 110 | return $this; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Get the current version of memcached. |
| 115 | * |
| 116 | * @param array $servers |
| 117 | * @return Memcached |
| 118 | */ |
| 119 | public function addServers(array $servers): Memcached |
| 120 | { |
| 121 | $this->memcached->addServers($servers); |
| 122 | return $this; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Get the current version of memcached. |
| 127 | * |
| 128 | * @return ?string |
| 129 | */ |
| 130 | public function getVersion(): ?string |
| 131 | { |
| 132 | return $this->version; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Get the time-to-live for an item in cache |
| 137 | * |
| 138 | * @param string $id |
| 139 | * @param int $default |
| 140 | * @return int |
| 141 | */ |
| 142 | public function getItemTtl(string $id, int $default = 0): int |
| 143 | { |
| 144 | $cacheValue = $this->memcached->get($this->key($id)); |
| 145 | $ttl = $default; |
| 146 | |
| 147 | if (is_array($cacheValue) && array_key_exists('ttl', $cacheValue)) { |
| 148 | $ttl = $cacheValue['ttl']; |
| 149 | } |
| 150 | |
| 151 | return $ttl; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Save an item to cache |
| 156 | * |
| 157 | * @param string $id |
| 158 | * @param mixed $value |
| 159 | * @param ?int $ttl |
| 160 | * @return Memcached |
| 161 | */ |
| 162 | public function saveItem(string $id, mixed $value, ?int $ttl = null): Memcached |
| 163 | { |
| 164 | $cacheValue = [ |
| 165 | 'start' => $this->clock->now(), |
| 166 | 'ttl' => ($ttl !== null) ? $ttl : $this->ttl, |
| 167 | 'value' => $value |
| 168 | ]; |
| 169 | |
| 170 | $this->memcached->set($this->key($id), $cacheValue, $cacheValue['ttl']); |
| 171 | |
| 172 | return $this; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Get an item from cache |
| 177 | * |
| 178 | * @param string $id |
| 179 | * @param mixed $default |
| 180 | * @return mixed |
| 181 | */ |
| 182 | public function getItem(string $id, mixed $default = false): mixed |
| 183 | { |
| 184 | $cacheValue = $this->memcached->get($this->key($id)); |
| 185 | $value = $default; |
| 186 | |
| 187 | if (is_array($cacheValue) && array_key_exists('start', $cacheValue) && |
| 188 | array_key_exists('ttl', $cacheValue) && array_key_exists('value', $cacheValue)) { |
| 189 | if ($this->isFresh($cacheValue)) { |
| 190 | $value = $cacheValue['value']; |
| 191 | } else { |
| 192 | $this->deleteItem($id); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | return $value; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Determine if the item exist in cache |
| 201 | * |
| 202 | * @param string $id |
| 203 | * @return bool |
| 204 | */ |
| 205 | public function hasItem(string $id): bool |
| 206 | { |
| 207 | return ($this->getItem($id) !== false); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * Delete a value in cache |
| 212 | * |
| 213 | * @param string $id |
| 214 | * @return Memcached |
| 215 | */ |
| 216 | public function deleteItem(string $id): Memcached |
| 217 | { |
| 218 | $this->memcached->delete($this->key($id)); |
| 219 | return $this; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Clear all stored values from cache |
| 224 | * |
| 225 | * @return Memcached |
| 226 | */ |
| 227 | public function clear(): Memcached |
| 228 | { |
| 229 | $this->memcached->set($this->versionKey(), $this->resolveVersion() + 1, 0); |
| 230 | return $this; |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * Destroy cache resource |
| 235 | * |
| 236 | * @return Memcached |
| 237 | */ |
| 238 | public function destroy(): Memcached |
| 239 | { |
| 240 | $this->clear(); |
| 241 | $this->memcached = null; |
| 242 | return $this; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Atomically increment a counter in cache, creating it at $initial if it doesn't exist |
| 247 | * |
| 248 | * Stored as a raw scalar, bypassing the start/ttl/value envelope used by saveItem()/getItem() entirely |
| 249 | * — a counter key and a saveItem()-managed key are two incompatible storage formats on this adapter, |
| 250 | * and a counter is not readable via getItem(). Requires the binary protocol (enabled in the |
| 251 | * constructor) — the default ASCII protocol silently ignores a non-default initial value. $ttl is |
| 252 | * honored only when the counter is first created; a later call does not refresh an existing counter's |
| 253 | * expiry. |
| 254 | * |
| 255 | * Deviation from the original plan: Memcached::increment() alone, when creating a new counter, seeds |
| 256 | * it at $initial only and silently discards $amount (verified empirically: incrementItem('x', 5, 100) |
| 257 | * on a fresh key yields 100, not 105) — unlike Apc/Redis, where the equivalent single primitive folds |
| 258 | * both together. It also leaves the value stored as a raw ASCII wire-protocol counter, which |
| 259 | * Memcached::get() then returns as a string, not an int. So, mirroring the Apc adapter's |
| 260 | * apcu_add()+apcu_inc() pattern, this seeds via Memcached::add() (a no-op if the key already exists) |
| 261 | * and then unconditionally applies Memcached::increment() on top — this also happens to make |
| 262 | * Memcached::get() return a proper int thereafter, since add() stores through the normal serializer. |
| 263 | * |
| 264 | * @param string $id |
| 265 | * @param int $amount |
| 266 | * @param int $initial |
| 267 | * @param ?int $ttl |
| 268 | * @throws Exception |
| 269 | * @return int |
| 270 | */ |
| 271 | public function incrementItem(string $id, int $amount = 1, int $initial = 0, ?int $ttl = null): int |
| 272 | { |
| 273 | $key = $this->key($id); |
| 274 | $ttl = ($ttl !== null) ? $ttl : $this->ttl; |
| 275 | |
| 276 | $this->memcached->add($key, $initial, $ttl); |
| 277 | $result = $this->memcached->increment($key, $amount, $initial, $ttl); |
| 278 | |
| 279 | if ($result === false) { |
| 280 | throw new Exception('Error: The value at that key is not numeric.'); |
| 281 | } |
| 282 | |
| 283 | return $result; |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Atomically decrement a counter in cache, creating it at $initial if it doesn't exist |
| 288 | * |
| 289 | * Stored as a raw scalar, bypassing the start/ttl/value envelope used by saveItem()/getItem() entirely |
| 290 | * — a counter key and a saveItem()-managed key are two incompatible storage formats on this adapter, |
| 291 | * and a counter is not readable via getItem(). Unlike Redis/Apc, Memcached::decrement() clamps its |
| 292 | * result at 0 (unsigned 64-bit wire protocol) rather than going negative — a documented, accepted |
| 293 | * quirk of this adapter specifically. |
| 294 | * |
| 295 | * Deviation from the original plan: seeds via Memcached::add() before Memcached::decrement(), for the |
| 296 | * same reasons as incrementItem() above (see that method's docblock) — symmetry, and so a |
| 297 | * newly-created counter reflects $amount applied on top of $initial rather than $initial alone. |
| 298 | * |
| 299 | * @param string $id |
| 300 | * @param int $amount |
| 301 | * @param int $initial |
| 302 | * @param ?int $ttl |
| 303 | * @throws Exception |
| 304 | * @return int |
| 305 | */ |
| 306 | public function decrementItem(string $id, int $amount = 1, int $initial = 0, ?int $ttl = null): int |
| 307 | { |
| 308 | $key = $this->key($id); |
| 309 | $ttl = ($ttl !== null) ? $ttl : $this->ttl; |
| 310 | |
| 311 | $this->memcached->add($key, $initial, $ttl); |
| 312 | $result = $this->memcached->decrement($key, $amount, $initial, $ttl); |
| 313 | |
| 314 | if ($result === false) { |
| 315 | throw new Exception('Error: The value at that key is not numeric.'); |
| 316 | } |
| 317 | |
| 318 | return $result; |
| 319 | } |
| 320 | |
| 321 | /** |
| 322 | * Fetch the raw version value from memcached, or false if it isn't set |
| 323 | * |
| 324 | * @param string $key |
| 325 | * @return mixed |
| 326 | */ |
| 327 | protected function fetchVersion(string $key): mixed |
| 328 | { |
| 329 | return $this->memcached->get($key); |
| 330 | } |
| 331 | |
| 332 | } |