Code coverage report for lib/adapters/idb/allDocs.js

Statements: 21.9% (23 / 105)      Branches: 0% (0 / 66)      Functions: 0% (0 / 11)      Lines: 21.9% (23 / 105)      Ignored: none     

All files » lib/adapters/idb/ » allDocs.js
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'use strict';
 
var merge = require('../../merge');
var errors = require('../../deps/errors');
var idbUtils = require('./utils');
var idbConstants = require('./constants');
 
var ATTACH_STORE = idbConstants.ATTACH_STORE;
var BY_SEQ_STORE = idbConstants.BY_SEQ_STORE;
var DOC_STORE = idbConstants.DOC_STORE;
 
var decodeDoc = idbUtils.decodeDoc;
var decodeMetadata = idbUtils.decodeMetadata;
var fetchAttachmentsIfNecessary = idbUtils.fetchAttachmentsIfNecessary;
var postProcessAttachments = idbUtils.postProcessAttachments;
var openTransactionSafely = idbUtils.openTransactionSafely;
 
function createKeyRange(start, end, inclusiveEnd, key, descending) {
  try {
    if (start && end) {
      if (descending) {
        return IDBKeyRange.bound(end, start, !inclusiveEnd, false);
      } else {
        return IDBKeyRange.bound(start, end, false, !inclusiveEnd);
      }
    } else if (start) {
      if (descending) {
        return IDBKeyRange.upperBound(start);
      } else {
        return IDBKeyRange.lowerBound(start);
      }
    } else if (end) {
      if (descending) {
        return IDBKeyRange.lowerBound(end, !inclusiveEnd);
      } else {
        return IDBKeyRange.upperBound(end, !inclusiveEnd);
      }
    } else if (key) {
      return IDBKeyRange.only(key);
    }
  } catch (e) {
    return {error: e};
  }
  return null;
}
 
function handleKeyRangeError(api, opts, err, callback) {
  if (err.name === "DataError" && err.code === 0) {
    // data error, start is less than end
    return callback(null, {
      total_rows: api._meta.docCount,
      offset: opts.skip,
      rows: []
    });
  }
  callback(errors.error(errors.IDB_ERROR, err.name, err.message));
}
 
function idbAllDocs(opts, api, idb, callback) {
 
  function allDocsQuery(opts, callback) {
    var start = 'startkey' in opts ? opts.startkey : false;
    var end = 'endkey' in opts ? opts.endkey : false;
    var key = 'key' in opts ? opts.key : false;
    var skip = opts.skip || 0;
    var limit = typeof opts.limit === 'number' ? opts.limit : -1;
    var inclusiveEnd = opts.inclusive_end !== false;
    var descending = 'descending' in opts && opts.descending ? 'prev' : null;
 
    var keyRange = createKeyRange(start, end, inclusiveEnd, key, descending);
    if (keyRange && keyRange.error) {
      return handleKeyRangeError(api, opts, keyRange.error, callback);
    }
 
    var stores = [DOC_STORE, BY_SEQ_STORE];
 
    if (opts.attachments) {
      stores.push(ATTACH_STORE);
    }
    var txnResult = openTransactionSafely(idb, stores, 'readonly');
    if (txnResult.error) {
      return callback(txnResult.error);
    }
    var txn = txnResult.txn;
    var docStore = txn.objectStore(DOC_STORE);
    var seqStore = txn.objectStore(BY_SEQ_STORE);
    var cursor = descending ?
      docStore.openCursor(keyRange, descending) :
      docStore.openCursor(keyRange);
    var docIdRevIndex = seqStore.index('_doc_id_rev');
    var results = [];
    var docCount = 0;
 
    // if the user specifies include_docs=true, then we don't
    // want to block the main cursor while we're fetching the doc
    function fetchDocAsynchronously(metadata, row, winningRev) {
      var key = metadata.id + "::" + winningRev;
      docIdRevIndex.get(key).onsuccess =  function onGetDoc(e) {
        row.doc = decodeDoc(e.target.result);
        if (opts.conflicts) {
          row.doc._conflicts = merge.collectConflicts(metadata);
        }
        fetchAttachmentsIfNecessary(row.doc, opts, txn);
      };
    }
 
    function allDocsInner(cursor, winningRev, metadata) {
      var row = {
        id: metadata.id,
        key: metadata.id,
        value: {
          rev: winningRev
        }
      };
      var deleted = metadata.deleted;
      if (opts.deleted === 'ok') {
        results.push(row);
        // deleted docs are okay with "keys" requests
        if (deleted) {
          row.value.deleted = true;
          row.doc = null;
        } else if (opts.include_docs) {
          fetchDocAsynchronously(metadata, row, winningRev);
        }
      } else if (!deleted && skip-- <= 0) {
        results.push(row);
        if (opts.include_docs) {
          fetchDocAsynchronously(metadata, row, winningRev);
        }
        if (--limit === 0) {
          return;
        }
      }
      cursor.continue();
    }
 
    function onGetCursor(e) {
      docCount = api._meta.docCount; // do this within the txn for consistency
      var cursor = e.target.result;
      if (!cursor) {
        return;
      }
      var metadata = decodeMetadata(cursor.value);
      var winningRev = metadata.winningRev;
 
      allDocsInner(cursor, winningRev, metadata);
    }
 
    function onResultsReady() {
      callback(null, {
        total_rows: docCount,
        offset: opts.skip,
        rows: results
      });
    }
 
    function onTxnComplete() {
      if (opts.attachments) {
        postProcessAttachments(results, opts.binary).then(onResultsReady);
      } else {
        onResultsReady();
      }
    }
 
    txn.oncomplete = onTxnComplete;
    cursor.onsuccess = onGetCursor;
  }
 
  function allDocs(opts, callback) {
 
    if (opts.limit === 0) {
      return callback(null, {
        total_rows: api._meta.docCount,
        offset: opts.skip,
        rows: []
      });
    }
    allDocsQuery(opts, callback);
  }
 
  allDocs(opts, callback);
}
 
module.exports = idbAllDocs;