Method getCheckpoint

lib/index-browser.js:9490–9558

()

  }

  getCheckpoint() {
    var self = this;

    if (!self.opts.writeSourceCheckpoint && !self.opts.writeTargetCheckpoint) {
      return Promise.resolve(LOWEST_SEQ);
    }

    if (self.opts && self.opts.writeSourceCheckpoint && !self.opts.writeTargetCheckpoint) {
      return self.src.get(self.id).then(function (sourceDoc) {
        return sourceDoc.last_seq || LOWEST_SEQ;
      }).catch(function (err) {
        /* istanbul ignore if */
        if (err.status !== 404) {
          throw err;
        }
        return LOWEST_SEQ;
      });
    }

    return self.target.get(self.id).then(function (targetDoc) {
      if (self.opts && self.opts.writeTargetCheckpoint && !self.opts.writeSourceCheckpoint) {
        return targetDoc.last_seq || LOWEST_SEQ;
      }

      return self.src.get(self.id).then(function (sourceDoc) {
        // Since we can't migrate an old version doc to a new one
        // (no session id), we just go with the lowest seq in this case
        /* istanbul ignore if */
        if (targetDoc.version !== sourceDoc.version) {
          return LOWEST_SEQ;
        }

        var version;
        if (targetDoc.version) {
          version = targetDoc.version.toString();
        } else {
          version = "undefined";
        }

        if (version in comparisons) {
          return comparisons[version](targetDoc, sourceDoc);
        }
        /* istanbul ignore next */
        return LOWEST_SEQ;
      }, function (err) {
        if (err.status === 404 && targetDoc.last_seq) {
          return self.src.put({
            _id: self.id,
            last_seq: LOWEST_SEQ
          }).then(function () {
            return LOWEST_SEQ;
          }, function (err) {
            if (isForbiddenError(err)) {
              self.opts.writeSourceCheckpoint = false;
              return targetDoc.last_seq;
            }
            /* istanbul ignore next */
            return LOWEST_SEQ;