Function bulkGet

lib/index.js:220–333

(db, opts, callback)

// shim for P/CouchDB adapters that don't directly implement _bulk_get
function bulkGet(db, opts, callback) {
  var requests = opts.docs;

  // consolidate into one request per doc if possible
  var requestsById = new Map();
  requests.forEach(function (request) {
    if (requestsById.has(request.id)) {
      requestsById.get(request.id).push(request);
    } else {
      requestsById.set(request.id, [request]);
    }
  });

  var numDocs = requestsById.size;
  var numDone = 0;
  var perDocResults = new Array(numDocs);

  function collapseResultsAndFinish() {
    var results = [];
    perDocResults.forEach(function (res) {
      res.docs.forEach(function (info) {
        results.push({
          id: res.id,
          docs: [info]
        });
      });
    });
    callback(null, {results});
  }

  function checkDone() {
    if (++numDone === numDocs) {
      collapseResultsAndFinish();
    }
  }

  function gotResult(docIndex, id, docs) {
    perDocResults[docIndex] = {id, docs};
    checkDone();
  }

  var allRequests = [];
  requestsById.forEach(function (value, key) {
    allRequests.push(key);
  });

  var i = 0;

  function nextBatch() {

    if (i >= allRequests.length) {
      return;
    }

    var upTo = Math.min(i + MAX_NUM_CONCURRENT_REQUESTS, allRequests.length);
    var batch = allRequests.slice(i, upTo);
    processBatch(batch, i);
    i += batch.length;