all files / lib/deps/ migrate.js

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84.38% Branches 27/32
100% Functions 21/21
100% Lines 94/94
3 statements, 3 branches Ignored     
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'use strict';
 
Object.defineProperty(exports, "__esModule", {
  value: true
});
 
var _fs = require('fs');
 
var _fs2 = _interopRequireDefault(_fs);
 
var _path = require('path');
 
var _path2 = _interopRequireDefault(_path);
 
var _isLocalId = require('./docs/isLocalId');
 
var _isLocalId2 = _interopRequireDefault(_isLocalId);
 
var _winningRev = require('../deps/merge/winningRev');
 
var _winningRev2 = _interopRequireDefault(_winningRev);
 
var _levelup = require('levelup');
 
var _levelup2 = _interopRequireDefault(_levelup);
 
var _through = require('through2');
 
var _levelWriteStream = require('level-write-stream');
 
var _levelWriteStream2 = _interopRequireDefault(_levelWriteStream);
 
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
var stores = ['document-store', 'by-sequence', 'attach-store', 'attach-binary-store'];
function formatSeq(n) {
  return ('0000000000000000' + n).slice(-16);
}
var UPDATE_SEQ_KEY = '_local_last_update_seq';
var DOC_COUNT_KEY = '_local_doc_count';
var UUID_KEY = '_local_uuid';
 
var toSublevel = function (name, db, callback) {
  // local require to prevent crashing if leveldown isn't installed.
  var leveldown = require("leveldown");
 
  var base = _path2.default.resolve(name);
  function move(store, index, cb) {
    var storePath = _path2.default.join(base, store);
    var opts;
    if (index === 3) {
      opts = {
        valueEncoding: 'binary'
      };
    } else {
      opts = {
        valueEncoding: 'json'
      };
    }
    var sub = db.sublevel(store, opts);
    var orig = (0, _levelup2.default)(storePath, opts);
    var from = orig.createReadStream();
    var writeStream = new _levelWriteStream2.default(sub);
    var to = writeStream();
    from.on('end', function () {
      orig.close(function (err) {
        cb(err, storePath);
      });
    });
    from.pipe(to);
  }
  _fs2.default.unlink(base + '.uuid', function (err) {
    if (err) {
      return callback();
    }
    var todo = 4;
    var done = [];
    stores.forEach(function (store, i) {
      move(store, i, function (err, storePath) {
        /* istanbul ignore if */
        Iif (err) {
          return callback(err);
        }
        done.push(storePath);
        if (! --todo) {
          done.forEach(function (item) {
            leveldown.destroy(item, function () {
              if (++todo === done.length) {
                _fs2.default.rmdir(base, callback);
              }
            });
          });
        }
      });
    });
  });
};
var localAndMetaStores = function (db, stores, callback) {
  var batches = [];
  stores.bySeqStore.get(UUID_KEY, function (err, value) {
    if (err) {
      // no uuid key, so don't need to migrate;
      return callback();
    }
    batches.push({
      key: UUID_KEY,
      value: value,
      prefix: stores.metaStore,
      type: 'put',
      valueEncoding: 'json'
    });
    batches.push({
      key: UUID_KEY,
      prefix: stores.bySeqStore,
      type: 'del'
    });
    stores.bySeqStore.get(DOC_COUNT_KEY, function (err, value) {
      Eif (value) {
        // if no doc count key,
        // just skip
        // we can live with this
        batches.push({
          key: DOC_COUNT_KEY,
          value: value,
          prefix: stores.metaStore,
          type: 'put',
          valueEncoding: 'json'
        });
        batches.push({
          key: DOC_COUNT_KEY,
          prefix: stores.bySeqStore,
          type: 'del'
        });
      }
      stores.bySeqStore.get(UPDATE_SEQ_KEY, function (err, value) {
        Eif (value) {
          // if no UPDATE_SEQ_KEY
          // just skip
          // we've gone to far to stop.
          batches.push({
            key: UPDATE_SEQ_KEY,
            value: value,
            prefix: stores.metaStore,
            type: 'put',
            valueEncoding: 'json'
          });
          batches.push({
            key: UPDATE_SEQ_KEY,
            prefix: stores.bySeqStore,
            type: 'del'
          });
        }
        var deletedSeqs = {};
        stores.docStore.createReadStream({
          startKey: '_',
          endKey: '_\xFF'
        }).pipe((0, _through.obj)(function (ch, _, next) {
          if (!(0, _isLocalId2.default)(ch.key)) {
            return next();
          }
          batches.push({
            key: ch.key,
            prefix: stores.docStore,
            type: 'del'
          });
          var winner = (0, _winningRev2.default)(ch.value);
          Object.keys(ch.value.rev_map).forEach(function (key) {
            Eif (key !== 'winner') {
              this.push(formatSeq(ch.value.rev_map[key]));
            }
          }, this);
          var winningSeq = ch.value.rev_map[winner];
          stores.bySeqStore.get(formatSeq(winningSeq), function (err, value) {
            Eif (!err) {
              batches.push({
                key: ch.key,
                value: value,
                prefix: stores.localStore,
                type: 'put',
                valueEncoding: 'json'
              });
            }
            next();
          });
        })).pipe((0, _through.obj)(function (seq, _, next) {
          /* istanbul ignore if */
          Iif (deletedSeqs[seq]) {
            return next();
          }
          deletedSeqs[seq] = true;
          stores.bySeqStore.get(seq, function (err, resp) {
            /* istanbul ignore if */
            Iif (err || !(0, _isLocalId2.default)(resp._id)) {
              return next();
            }
            batches.push({
              key: seq,
              prefix: stores.bySeqStore,
              type: 'del'
            });
            next();
          });
        }, function (next) {
          db.batch(batches, callback);
        }));
      });
    });
  });
};
 
exports.default = {
  toSublevel: toSublevel,
  localAndMetaStores: localAndMetaStores
};
module.exports = exports['default'];