Class: Lyra::EventFlow

Inherits:
Object
  • Object
show all
Defined in:
lib/lyra/event_flow.rb

Overview

Visualizes event flows and chains

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(subject_id: nil, subject_type: nil, time_range: nil) ⇒ EventFlow

Returns a new instance of EventFlow.



6
7
8
9
10
 
# File 'lib/lyra/event_flow.rb', line 6

def initialize(subject_id: nil, subject_type: nil, time_range: nil)
  @subject_id = subject_id
  @subject_type = subject_type
  @time_range = time_range || (30.days.ago..Time.current)
end

Instance Attribute Details

#subject_id ⇒ Object (readonly)

Returns the value of attribute subject_id.



4
5
6
 
# File 'lib/lyra/event_flow.rb', line 4

def subject_id
  @subject_id
end

#subject_type ⇒ Object (readonly)

Returns the value of attribute subject_type.



4
5
6
 
# File 'lib/lyra/event_flow.rb', line 4

def subject_type
  @subject_type
end

#time_range ⇒ Object (readonly)

Returns the value of attribute time_range.



4
5
6
 
# File 'lib/lyra/event_flow.rb', line 4

def time_range
  @time_range
end

Instance Method Details

#build_flows(grouped_events) ⇒ Object

Build event flows showing cause and effect



45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/lyra/event_flow.rb', line 45

def build_flows(grouped_events)
  grouped_events.map do |correlation_id, events|
    {
      correlation_id: correlation_id,
      started_at: event_timestamp(events.min_by { |e| event_timestamp(e) }),
      completed_at: event_timestamp(events.max_by { |e| event_timestamp(e) }),
      duration: calculate_duration(events),
      user_action: events.first.metadata[:user_action],
      user_id: events.first.metadata[:user_id],
      events_chain: build_event_chain(events),
      crud_operations: extract_crud_operations(events),
      privacy_impact: calculate_flow_privacy_impact(events)
    }
  end
end

#build_timeline(events) ⇒ Object

Build timeline view showing CRUD operations and their events



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
 
# File 'lib/lyra/event_flow.rb', line 26

def build_timeline(events)
  events.sort_by { |e| event_timestamp(e) }.map do |event|
    {
      event_id: event.event_id,
      timestamp: event_timestamp(event),
      operation: event_operation(event),
      model_class: event_model_class(event),
      model_id: event_model_id(event),
      correlation_id: event.metadata[:correlation_id],
      action_id: event.metadata[:action_id],
      user_action: event.metadata[:user_action],
      changes: event_changes(event),
      pii_fields: detect_pii(event),
      grouped_with: find_grouped_events(event, events)
    }
  end
end

#crud_to_event_mapping(model_class, operation, model_id = nil) ⇒ Object

Show how a single CRUD operation maps to events



62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
 
# File 'lib/lyra/event_flow.rb', line 62

def crud_to_event_mapping(model_class, operation, model_id = nil)
  events = load_events.select do |event|
    matches = event_model_class(event) == model_class && event_operation(event) == operation
    matches &&= event_model_id(event) == model_id if model_id
    matches
  end

  {
    crud_operation: {
      model: model_class,
      operation: operation,
      record_id: model_id
    },
    generated_events: events.map { |e| event_summary(e) },
    count: events.count,
    timeline: events.sort_by { |e| event_timestamp(e) }.map do |e|
      {
        timestamp: event_timestamp(e),
        event_type: e.class.name,
        event_id: e.event_id,
        data: e.data
      }
    end
  }
end

#data_lineage(field_name, model_class = nil) ⇒ Object

Visualize data lineage for GDPR compliance



131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/lyra/event_flow.rb', line 131

def data_lineage(field_name, model_class = nil)
  events = load_events

  if model_class
    events = events.select { |e| event_model_class(e) == model_class }
  end

  lineage = []

  events.each do |event|
    attrs = event_attributes(event)
    changes = event_changes(event)
    if attrs.key?(field_name) || attrs.key?(field_name.to_s) || changes.key?(field_name) || changes.key?(field_name.to_s)
      lineage << {
        timestamp: event_timestamp(event),
        event_id: event.event_id,
        model: event_model_class(event),
        record_id: event_model_id(event),
        operation: event_operation(event),
        old_value: changes.dig(field_name, 0) || changes.dig(field_name.to_s, 0),
        new_value: changes.dig(field_name, 1) || changes.dig(field_name.to_s, 1) || attrs[field_name] || attrs[field_name.to_s],
        source: event.metadata[:source],
        user_id: event.metadata[:user_id],
        action: event.metadata[:user_action]
      }
    end
  end

  {
    field: field_name,
    model_class: model_class,
    total_modifications: lineage.count,
    first_seen: lineage.min_by { |l| l[:timestamp] }&.dig(:timestamp),
    last_modified: lineage.max_by { |l| l[:timestamp] }&.dig(:timestamp),
    lineage: lineage.sort_by { |l| l[:timestamp] }
  }
end

#flow_data ⇒ Object

Get complete event flow for visualization



13
14
15
16
17
18
19
20
21
22
23
 
# File 'lib/lyra/event_flow.rb', line 13

def flow_data
  events = load_events
  grouped = group_by_correlation(events)

  {
    timeline: build_timeline(events),
    flows: build_flows(grouped),
    statistics: calculate_statistics(events),
    privacy_impact: analyze_privacy_impact(events)
  }
end

#privacy_impact_analysis ⇒ Object

Analyze privacy impact of event chains



170
171
172
173
174
175
176
177
178
179
180
181
182
183
 
# File 'lib/lyra/event_flow.rb', line 170

def privacy_impact_analysis
  events = load_events
  pii_inventory = extract_pii_from_events(events)

  {
    total_events: events.count,
    events_with_pii: events.count { |e| has_pii?(e) },
    pii_categories: pii_inventory.keys,
    pii_fields_count: pii_inventory.values.sum(&:count),
    sensitive_operations: identify_sensitive_operations(events),
    data_flows: trace_data_flows(events),
    risk_assessment: assess_privacy_risk(events, pii_inventory)
  }
end

#reconstruct_state_chain(model_class, model_id) ⇒ Object

Reconstruct state from event chain



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
 
# File 'lib/lyra/event_flow.rb', line 89

def reconstruct_state_chain(model_class, model_id)
  stream_name = "#{model_class}$#{model_id}"
  events = Lyra.config.event_store.read.stream(stream_name).to_a

  chain = []
  state = {}

  events.sort_by { |e| event_timestamp(e) }.each do |event|
    previous_state = state.dup

    case event_operation(event)
    when :created
      state = event_attributes(event).dup
    when :updated
      event_changes(event).each { |k, (old, new)| state[k] = new }
    when :destroyed
      state[:_deleted] = true
      state[:_deleted_at] = event_timestamp(event)
    end

    chain << {
      event_id: event.event_id,
      timestamp: event_timestamp(event),
      operation: event_operation(event),
      previous_state: previous_state,
      changes: event_changes(event),
      new_state: state.dup,
      pii_changed: identify_pii_changes(previous_state, state),
      user_action: event.metadata[:user_action]
    }
  end

  {
    model: { class: model_class, id: model_id },
    initial_state: {},
    final_state: state,
    events_count: events.count,
    state_evolution: chain
  }
end