most-couchdb/with-update.js

most (data streaming) for CouchDB

// Generated by CoffeeScript 2.4.1
(function() {
  var CouchDBWithUpdate, id_of, isDeepStrictEqual, merge_map, update_map;

  merge_map = function(doc) {
    return Object.assign({}, doc);
  };

  update_map = function(doc) {
    return {
      _rev: doc._rev
    };
  };

  id_of = function({_id}) {
    return _id;
  };

  CouchDBWithUpdate = class CouchDBWithUpdate extends require('./db') {
    constructor(...args) {
      super(...args);
      this.count = {
        new: 0n,
        changed: 0n,
        unchanged: 0n
      };
    }

    // Single-record merge / update
    // ----------------------------
    __merge(doc, data, map) {
      var new_doc;
      if ((doc != null ? doc._rev : void 0) != null) {
        new_doc = Object.assign(map(doc), data);
        if (!isDeepStrictEqual(new_doc, doc)) {
          this.count.changed++;
          return new_doc;
        } else {
          this.count.unchanged++;
          return null;
        }
      } else {
        this.count.new++;
        return data;
      }
    }

    async __update(id, data, map) {
      var doc, new_doc;
      doc = (await this.get(id).catch(function() {
        return {};
      }));
      new_doc = this.__merge(doc, data, map);
      if (new_doc != null) {
        await this.put(new_doc);
      }
    }

    // `merge`: update the fields indicated by `data` in an existing document indicated by `id`
    // The update is only processed if the document would change.
    merge(id, data) {
      return this.__update(id, data, merge_map);
    }

    // `update`: replace a document with new content
    // The update is only processed if the document would change.
    update(data) {
      return this.__update(id_of(data), data, update_map);
    }

    // Bulk update
    // -----------
    async bulk_get(docs) { // docs is an Array of {id,rev}
      var body, results, uri;
      uri = new URL('_bulk_get', this.uri + '/');
      ({body} = (await this.agent.post(uri.toString()).send({docs}).accept('json')));
      ({results} = body);
      return docs = results.map(function({docs}) {
        var ref;
        return (ref = docs[0].ok) != null ? ref : null;
      });
    }

    async bulk_docs(docs) { // docs is an Array of documents
      var body, uri;
      uri = new URL('_bulk_docs', this.uri + '/');
      ({body} = (await this.agent.post(uri.toString()).send({docs}).accept('json')));
      return body;
    }

    async __bulk_update(ids, new_docs, map) {
      var changed, docs, results;
      docs = (await this.bulk_get(ids.map(function(id) {
        return {id};
      })));
      new_docs = docs.map((doc, i) => {
        var data;
        data = new_docs[i];
        return this.__merge(doc, data, map);
      });
      changed = new_docs.filter(function(doc) {
        return doc != null;
      });
      if (changed.length > 0) {
        results = (await this.bulk_docs(changed));
      } else {
        results = [];
      }
      return results;
    }

    bulk_merge(ids, changes) {
      return this.__bulk_update(ids, changes, merge_map);
    }

    bulk_update(docs) {
      return this.__bulk_update(docs.map(id_of), docs, update_map);
    }

  };

  module.exports = CouchDBWithUpdate;

  ({isDeepStrictEqual} = require('util'));

}).call(this);