Class: PostHog::Client

Inherits:
Object
  • Object
show all
Includes:
Logging, Utils
Defined in:
lib/posthog/client.rb

Constant Summary

Constants included from Utils

Utils::UTC_OFFSET_WITHOUT_COLON, Utils::UTC_OFFSET_WITH_COLON

Instance Method Summary collapse

Methods included from Logging

included, #logger

Methods included from Utils

convert_to_datetime, date_in_iso8601, datetime_in_iso8601, formatted_offset, is_valid_regex, isoify_dates, isoify_dates!, seconds_to_utc_offset, stringify_keys, symbolize_keys, symbolize_keys!, time_in_iso8601, uid

Constructor Details

#initialize(opts = {}) ⇒ Client

Returns a new instance of Client.

Parameters:

  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :api_key (String) —

    Your project’s api_key

  • :personal_api_key (String) —

    Your personal API key

  • :max_queue_size (FixNum) —

    Maximum number of calls to be remain queued. Defaults to 10_000.

  • :test_mode (Bool) —

    true if messages should remain queued for testing. Defaults to false.

  • :on_error (Proc) —

    Handles error calls from the API.

  • :host (String) —

    Fully qualified hostname of the PostHog server. Defaults to https://app.posthog.com

  • :feature_flags_polling_interval (Integer) —

    How often to poll for feature flag definition changes. Measured in seconds, defaults to 30.

  • :feature_flag_request_timeout_seconds (Integer) —

    How long to wait for feature flag evaluation. Measured in seconds, defaults to 3.

  • :before_send (Proc) —

    A block that receives the event hash and should return either a modified hash to be sent to PostHog or nil to prevent the event from being sent. e.g. ‘before_send: ->(event) { event }`



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/posthog/client.rb', line 31

def initialize(opts = {})
  symbolize_keys!(opts)

  opts[:host] ||= 'https://app.posthog.com'

  @queue = Queue.new
  @api_key = opts[:api_key]
  @max_queue_size = opts[:max_queue_size] || Defaults::Queue::MAX_SIZE
  @worker_mutex = Mutex.new
  @worker = if opts[:test_mode]
              NoopWorker.new(@queue)
            else
              SendWorker.new(@queue, @api_key, opts)
            end
  @worker_thread = nil
  @feature_flags_poller = nil
  @personal_api_key = opts[:personal_api_key]

  check_api_key!

  @feature_flags_poller =
    FeatureFlagsPoller.new(
      opts[:feature_flags_polling_interval],
      opts[:personal_api_key],
      @api_key,
      opts[:host],
      opts[:feature_flag_request_timeout_seconds] || Defaults::FeatureFlags::FLAG_REQUEST_TIMEOUT_SECONDS,
      opts[:on_error]
    )

  @distinct_id_has_sent_flag_calls = SizeLimitedHash.new(Defaults::MAX_HASH_SIZE) do |hash, key|
    hash[key] = []
  end

  @before_send = opts[:before_send]
end

Instance Method Details

#alias(attrs) ⇒ Object

Aliases a user from one id to another

Parameters:

  • attrs (Hash)

Options Hash (attrs):

  • :alias (String) —

    The alias to give the distinct id

  • :message_id (String) —

    ID that uniquely identifies a message across the API. (optional)

  • :timestamp (Time) —

    When the event occurred (optional)

  • :distinct_id (String) —

    The ID for this user in your database



147
148
149
150
 
# File 'lib/posthog/client.rb', line 147

def alias(attrs)
  symbolize_keys! attrs
  enqueue(FieldParser.parse_for_alias(attrs))
end

#capture(attrs) ⇒ Object

Captures an event

Parameters:

  • attrs (Hash)

Options Hash (attrs):

  • :event (String) —

    Event name

  • :properties (Hash) —

    Event properties (optional)

  • :send_feature_flags (Bool) —

    Whether to send feature flags with this event (optional)

  • :uuid (String) —

    ID that uniquely identifies an event; events in PostHog are deduplicated by the combination of teamId, timestamp date, event name, distinct id, and UUID

  • :message_id (String) —

    ID that uniquely identifies a message across the API. (optional)

  • :timestamp (Time) —

    When the event occurred (optional)

  • :distinct_id (String) —

    The ID for this user in your database



104
105
106
107
108
109
110
111
112
113
114
 
# File 'lib/posthog/client.rb', line 104

def capture(attrs)
  symbolize_keys! attrs

  if attrs[:send_feature_flags]
    feature_variants = @feature_flags_poller.get_feature_variants(attrs[:distinct_id], attrs[:groups] || {})

    attrs[:feature_variants] = feature_variants
  end

  enqueue(FieldParser.parse_for_capture(attrs))
end

#clear ⇒ Object

Clears the queue without waiting.

Use only in test mode



82
83
84
 
# File 'lib/posthog/client.rb', line 82

def clear
  @queue.clear
end

#dequeue_last_message ⇒ Hash

Returns pops the last message from the queue.

Returns:

  • (Hash) —

    pops the last message from the queue



153
154
155
 
# File 'lib/posthog/client.rb', line 153

def dequeue_last_message
  @queue.pop
end

#flush ⇒ Object

Synchronously waits until the worker has cleared the queue.

Use only for scripts which are not long-running, and will specifically exit



72
73
74
75
76
77
 
# File 'lib/posthog/client.rb', line 72

def flush
  while !@queue.empty? || @worker.is_requesting?
    ensure_worker_running
    sleep(0.1)
  end
end

#get_all_flags(distinct_id, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false) ⇒ Hash

Returns all flags for a given user

Parameters:

  • distinct_id (String) —

    The distinct id of the user

  • groups (Hash) (defaults to: {})
  • person_properties (Hash) (defaults to: {}) —

    key-value pairs of properties to associate with the user.

  • group_properties (Hash) (defaults to: {})

Returns:

  • (Hash) —

    String (not symbol) key value pairs of flag and their values



264
265
266
267
268
269
270
271
272
273
274
275
 
# File 'lib/posthog/client.rb', line 264

def get_all_flags(
  distinct_id,
  groups: {},
  person_properties: {},
  group_properties: {},
  only_evaluate_locally: false
)
  person_properties, group_properties = add_local_person_and_group_properties(distinct_id, groups,
                                                                              person_properties, group_properties)
  @feature_flags_poller.get_all_flags(distinct_id, groups, person_properties, group_properties,
                                      only_evaluate_locally)
end

#get_all_flags_and_payloads(distinct_id, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false) ⇒ Hash

Returns all flags and payloads for a given user

Parameters:

  • distinct_id (String) —

    The distinct id of the user

  • [Hash] (Hash) —

    a customizable set of options

  • [Boolean] (Hash) —

    a customizable set of options

Returns:

  • (Hash) —

    A hash with the following keys: featureFlags: A hash of feature flags featureFlagPayloads: A hash of feature flag payloads



314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
 
# File 'lib/posthog/client.rb', line 314

def get_all_flags_and_payloads(
  distinct_id,
  groups: {},
  person_properties: {},
  group_properties: {},
  only_evaluate_locally: false
)
  person_properties, group_properties = add_local_person_and_group_properties(
    distinct_id, groups, person_properties, group_properties
  )
  response = @feature_flags_poller.get_all_flags_and_payloads(
    distinct_id, groups, person_properties, group_properties, only_evaluate_locally
  )

  response.delete(:requestId) # remove internal information.
  response
end

#get_feature_flag(key, distinct_id, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false, send_feature_flag_events: true) ⇒ String?

Returns whether the given feature flag is enabled for the given user or not

The provided properties are used to calculate feature flags locally, if possible.

groups are a mapping from group type to group key. So, if you have a group type of “organization” and a group key of “5”, you would pass groups=“5”. group_properties take the format: { group_type_name: { group_properties } } So, for example, if you have the group type “organization” and the group key “5”, with the properties name, and employee count, you’ll send these as: “‘ruby

group_properties: {"organization": {"name": "PostHog", "employees": 11}}

“‘

Parameters:

  • key (String) —

    The key of the feature flag

  • distinct_id (String) —

    The distinct id of the user

  • groups (Hash) (defaults to: {})
  • person_properties (Hash) (defaults to: {}) —

    key-value pairs of properties to associate with the user.

  • group_properties (Hash) (defaults to: {})

Returns:

  • (String, nil) —

    The value of the feature flag



213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
 
# File 'lib/posthog/client.rb', line 213

def get_feature_flag(
  key,
  distinct_id,
  groups: {},
  person_properties: {},
  group_properties: {},
  only_evaluate_locally: false,
  send_feature_flag_events: true
)
  person_properties, group_properties = add_local_person_and_group_properties(
    distinct_id,
    groups,
    person_properties,
    group_properties
  )
  feature_flag_response, flag_was_locally_evaluated, request_id = @feature_flags_poller.get_feature_flag(
    key,
    distinct_id,
    groups,
    person_properties,
    group_properties,
    only_evaluate_locally
  )

  feature_flag_reported_key = "#{key}_#{feature_flag_response}"
  if !@distinct_id_has_sent_flag_calls[distinct_id].include?(feature_flag_reported_key) && send_feature_flag_events
    capture(
      {
        distinct_id: distinct_id,
        event: '$feature_flag_called',
        properties: {
          '$feature_flag' => key,
          '$feature_flag_response' => feature_flag_response,
          'locally_evaluated' => flag_was_locally_evaluated
        }.merge(request_id ? { '$feature_flag_request_id' => request_id } : {}),
        groups: groups
      }
    )
    @distinct_id_has_sent_flag_calls[distinct_id] << feature_flag_reported_key
  end
  feature_flag_response
end

#get_feature_flag_payload(key, distinct_id, match_value: nil, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false) ⇒ Object

Returns payload for a given feature flag

Parameters:

  • key (String) —

    The key of the feature flag

  • distinct_id (String) —

    The distinct id of the user

  • [String (Hash) —

    a customizable set of options

  • [Hash] (Hash) —

    a customizable set of options

  • [Boolean] (Hash) —

    a customizable set of options



287
288
289
290
291
292
293
294
295
296
297
298
299
300
 
# File 'lib/posthog/client.rb', line 287

def get_feature_flag_payload(
  key,
  distinct_id,
  match_value: nil,
  groups: {},
  person_properties: {},
  group_properties: {},
  only_evaluate_locally: false
)
  person_properties, group_properties = add_local_person_and_group_properties(distinct_id, groups,
                                                                              person_properties, group_properties)
  @feature_flags_poller.get_feature_flag_payload(key, distinct_id, match_value, groups, person_properties,
                                                 group_properties, only_evaluate_locally)
end

#get_remote_config_payload(flag_key) ⇒ String

Returns The decrypted value of the feature flag payload.

Parameters:

  • flag_key (String) —

    The unique flag key of the feature flag

Returns:

  • (String) —

    The decrypted value of the feature flag payload



188
189
190
 
# File 'lib/posthog/client.rb', line 188

def get_remote_config_payload(flag_key)
  @feature_flags_poller.get_remote_config_payload(flag_key)
end

#group_identify(attrs) ⇒ Object

Identifies a group

Parameters:

  • attrs (Hash)

Options Hash (attrs):

  • :group_type (String) —

    Group type

  • :group_key (String) —

    Group key

  • :properties (Hash) —

    Group properties (optional)

  • :distinct_id (String) —

    Distinct ID (optional)

  • :message_id (String) —

    ID that uniquely identifies a message across the API. (optional)

  • :timestamp (Time) —

    When the event occurred (optional)

  • :distinct_id (String) —

    The ID for this user in your database



136
137
138
139
 
# File 'lib/posthog/client.rb', line 136

def group_identify(attrs)
  symbolize_keys! attrs
  enqueue(FieldParser.parse_for_group_identify(attrs))
end

#identify(attrs) ⇒ Object

Identifies a user

Parameters:

  • attrs (Hash)

Options Hash (attrs):

  • :properties (Hash) —

    User properties (optional)

  • :message_id (String) —

    ID that uniquely identifies a message across the API. (optional)

  • :timestamp (Time) —

    When the event occurred (optional)

  • :distinct_id (String) —

    The ID for this user in your database



122
123
124
125
 
# File 'lib/posthog/client.rb', line 122

def identify(attrs)
  symbolize_keys! attrs
  enqueue(FieldParser.parse_for_identify(attrs))
end

#is_feature_enabled(flag_key, distinct_id, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false, send_feature_flag_events: true) ⇒ Object

TODO: In future version, rename to feature_flag_enabled?



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
 
# File 'lib/posthog/client.rb', line 163

def is_feature_enabled( # rubocop:disable Naming/PredicateName
  flag_key,
  distinct_id,
  groups: {},
  person_properties: {},
  group_properties: {},
  only_evaluate_locally: false,
  send_feature_flag_events: true
)
  response = get_feature_flag(
    flag_key,
    distinct_id,
    groups: groups,
    person_properties: person_properties,
    group_properties: group_properties,
    only_evaluate_locally: only_evaluate_locally,
    send_feature_flag_events: send_feature_flag_events
  )
  return nil if response.nil?

  !!response
end

#queued_messages ⇒ Fixnum

Returns number of messages in the queue.

Returns:

  • (Fixnum) —

    number of messages in the queue



158
159
160
 
# File 'lib/posthog/client.rb', line 158

def queued_messages
  @queue.length
end

#reload_feature_flags ⇒ Object 



332
333
334
335
336
337
338
339
340
 
# File 'lib/posthog/client.rb', line 332

def reload_feature_flags
  unless @personal_api_key
    logger.error(
      'You need to specify a personal_api_key to locally evaluate feature flags'
    )
    return
  end
  @feature_flags_poller.load_feature_flags(true)
end

#shutdown ⇒ Object 



342
343
344
345
 
# File 'lib/posthog/client.rb', line 342

def shutdown
  @feature_flags_poller.shutdown_poller
  flush
end