Real-time collaboration for Jupyter Notebooks, Linux Terminals, LaTeX, VS Code, R IDE, and more,
all in one place.

1
begin
2
  require 'mongo'
3
rescue LoadError
4
  puts "You need the mongo gem to use Anemone::Storage::MongoDB"
5
  exit
6
end
7

8
module Anemone
9
  module Storage
10
    class MongoDB 
11

12
      BINARY_FIELDS = %w(body headers data)
13

14
      def initialize(mongo_db, collection_name)
15
        @db = mongo_db
16
        @collection = @db[collection_name]
17
        @collection.remove
18
        @collection.create_index 'url'
19
      end
20

21
      def [](url)
22
        if value = @collection.find_one('url' => url.to_s)
23
          load_page(value)
24
        end
25
      end
26

27
      def []=(url, page)
28
        hash = page.to_hash
29
        BINARY_FIELDS.each do |field|
30
          hash[field] = BSON::Binary.new(hash[field]) unless hash[field].nil?
31
        end
32
        @collection.update(
33
          {'url' => page.url.to_s},
34
          hash,
35
          :upsert => true
36
        )
37
      end
38

39
      def delete(url)
40
        page = self[url]
41
        @collection.remove('url' => url.to_s)
42
        page
43
      end
44

45
      def each
46
        @collection.find do |cursor|
47
          cursor.each do |doc|
48
            page = load_page(doc)
49
            yield page.url.to_s, page 
50
          end
51
        end
52
      end
53

54
      def merge!(hash)
55
        hash.each { |key, value| self[key] = value }
56
        self
57
      end
58

59
      def size
60
        @collection.count
61
      end
62

63
      def keys
64
        keys = []
65
        self.each { |k, v| keys << k.to_s }
66
        keys
67
      end
68

69
      def has_key?(url)
70
        !!@collection.find_one('url' => url.to_s)
71
      end
72

73
      def close
74
        @db.connection.close
75
      end
76

77
      private
78

79
      def load_page(hash)
80
        BINARY_FIELDS.each do |field|
81
          hash[field] = hash[field].to_s
82
        end
83
        Page.from_hash(hash)
84
      end
85

86
    end
87
  end
88
end
89

90

91