@tobiasberg/graphql-hooks-memcache/es/graphql-hooks-memcache.js

In memory cache for graphql-hooks

import LRU from 'tiny-lru';

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

function ownKeys(object, enumerableOnly) {
  var keys = Object.keys(object);

  if (Object.getOwnPropertySymbols) {
    var symbols = Object.getOwnPropertySymbols(object);
    if (enumerableOnly) symbols = symbols.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    });
    keys.push.apply(keys, symbols);
  }

  return keys;
}

function _objectSpread2(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i] != null ? arguments[i] : {};

    if (i % 2) {
      ownKeys(Object(source), true).forEach(function (key) {
        _defineProperty(target, key, source[key]);
      });
    } else if (Object.getOwnPropertyDescriptors) {
      Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
    } else {
      ownKeys(Object(source)).forEach(function (key) {
        Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
      });
    }
  }

  return target;
}

//
// Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

var OFFSET_BASIS_32 = 2166136261;

function fnv1aString(string) {
  var hash = OFFSET_BASIS_32;

  for (var i = 0; i < string.length; i++) {
    hash ^= string.charCodeAt(i); // 32-bit FNV prime: 2**24 + 2**8 + 0x93 = 16777619
    // Using bitshift for accuracy and performance. Numbers in JS suck.

    hash += (hash << 1) + (hash << 4) + (hash << 7) + (hash << 8) + (hash << 24);
  }

  return hash >>> 0;
}

function fnv1a(input) {
  if (typeof input === 'string') {
    return fnv1aString(input);
  } else {
    throw new Error('input must be a string');
  }
}

function generateKey(keyObj) {
  return fnv1a(JSON.stringify(keyObj)).toString(36);
}

function memCache(_temp) {
  var _ref = _temp === void 0 ? {} : _temp,
      _ref$size = _ref.size,
      size = _ref$size === void 0 ? 100 : _ref$size,
      _ref$ttl = _ref.ttl,
      ttl = _ref$ttl === void 0 ? 0 : _ref$ttl,
      _ref$debug = _ref.debug,
      debug = _ref$debug === void 0 ? false : _ref$debug,
      initialState = _ref.initialState;

  var lru = LRU(size, ttl);
  var debugLru = debug ? LRU(size, ttl) : undefined;

  if (initialState) {
    Object.keys(initialState).map(function (k) {
      lru.set(k, initialState[k]);
    });
  }

  return {
    get: function get(keyObj) {
      return lru.get(generateKey(keyObj));
    },
    rawGet: function rawGet(rawKey) {
      return lru.get(rawKey);
    },
    rawToKey: function rawToKey(rawKey) {
      if (!debugLru) {
        throw 'not allowed unless in debug mode';
      }

      return debugLru.get(rawKey);
    },
    set: function set(keyObj, data) {
      var key = generateKey(keyObj);
      lru.set(key, data);

      if (debugLru) {
        debugLru.set(key, keyObj);
      }
    },
    delete: function _delete(keyObj) {
      return lru.delete(generateKey(keyObj));
    },
    clear: function clear() {
      return lru.clear();
    },
    keys: function keys() {
      return lru.keys();
    },
    getInitialState: function getInitialState() {
      return lru.keys().reduce(function (initialState, key) {
        var _objectSpread2$1;

        return _objectSpread2(_objectSpread2({}, initialState), {}, (_objectSpread2$1 = {}, _objectSpread2$1[key] = lru.get(key), _objectSpread2$1));
      }, {});
    }
  };
}

export default memCache;