Class: Webhookdb::Replicator::IcalendarEventV1

Inherits:
Base
  • Object
show all
Includes:
Appydays::Loggable
Defined in:
lib/webhookdb/replicator/icalendar_event_v1.rb

Constant Summary collapse

CONV_REMOTE_KEY =
Webhookdb::Replicator::Column::IsomorphicProc.new(
  ruby: lambda do |_, resource:, **_|
    "#{resource.fetch('calendar_external_id')}-#{resource.fetch('UID').fetch('v')}"
  end,
  # Because this is a non-nullable key, we never need this in SQL
  sql: ->(_) { Sequel.lit("'do not use'") },
)
CONV_DATE =
Webhookdb::Replicator::Column::IsomorphicProc.new(
  ruby: lambda do |entry, **|
    self.entry_to_date(entry) if entry.is_a?(Hash) && self.entry_is_date_str?(entry)
  end,
  sql: Webhookdb::Replicator::Column::NOT_IMPLEMENTED,
)
CONV_DATETIME =
Webhookdb::Replicator::Column::IsomorphicProc.new(
  ruby: lambda do |entry, **|
    if entry.is_a?(Hash)
      if self.entry_is_date_str?(entry)
        nil
      else
        self.entry_to_datetime(entry).first
      end
    else
      # Entry may be a time if this was from the defaulter
      entry
    end
  end,
  sql: ->(_) { raise NotImplementedError },
)
CONV_MISSING_TZ =
Webhookdb::Replicator::Column::IsomorphicProc.new(
  ruby: lambda do |entry, **|
    may_have_missing_tz = entry.is_a?(Hash) && !self.entry_is_date_str?(entry)
    if may_have_missing_tz
      tzparsed = self.entry_to_datetime(entry)[1]
      !tzparsed
    else
      false
    end
  end,
  sql: ->(_) { Sequel[false] },
)
CONV_GEO_LAT =
Webhookdb::Replicator::Column.converter_array_element(index: 0, sep: ";", cls: DECIMAL)
CONV_GEO_LNG =
Webhookdb::Replicator::Column.converter_array_element(index: 1, sep: ";", cls: DECIMAL)
CONV_COMMA_SEP_ARRAY =
Webhookdb::Replicator::Column::IsomorphicProc.new(
  ruby: lambda do |entry, **|
    next [] if entry.nil?
    entries = []
    entry.each do |e|
      entries.concat(e.fetch("v").split(",").map(&:strip))
    end
    entries
  end,
  sql: ->(_) { raise NotImplementedError },
)
ARRAY_KEYS =

datatracker.ietf.org/doc/html/rfc5545#section-3.6.1 The following are OPTIONAL, and MAY occur more than once.

[
  "ATTACH",
  "ATTENDEE",
  "CATEGORIES",
  "COMMENT",
  "CONTACT",
  "EXDATE",
  "RSTATUS",
  "RELATED",
  "RESOURCES",
  "RDATE",
  "X-PROP",
  "IANA-PROP",
].freeze
NAME =
"[-a-zA-Z0-9]+"
QSTR =
'"[^"]*"'
PTEXT =
'[^";:,]*'
PVALUE =
"(?:#{QSTR}|#{PTEXT})".freeze
PARAM =
"(#{NAME})=(#{PVALUE}(?:,#{PVALUE})*)".freeze
VALUE =
".*"
LINE =
"(?<name>#{NAME})(?<params>(?:;#{PARAM})*):(?<value>#{VALUE})".freeze

Constants inherited from Base

Base::MAX_INDEX_NAME_LENGTH

Constants included from DBAdapter::ColumnTypes

DBAdapter::ColumnTypes::BIGINT, DBAdapter::ColumnTypes::BIGINT_ARRAY, DBAdapter::ColumnTypes::BOOLEAN, DBAdapter::ColumnTypes::COLUMN_TYPES, DBAdapter::ColumnTypes::DATE, DBAdapter::ColumnTypes::DECIMAL, DBAdapter::ColumnTypes::DOUBLE, DBAdapter::ColumnTypes::FLOAT, DBAdapter::ColumnTypes::INTEGER, DBAdapter::ColumnTypes::INTEGER_ARRAY, DBAdapter::ColumnTypes::OBJECT, DBAdapter::ColumnTypes::TEXT, DBAdapter::ColumnTypes::TEXT_ARRAY, DBAdapter::ColumnTypes::TIMESTAMP, DBAdapter::ColumnTypes::UUID

Instance Attribute Summary

Attributes inherited from Base

#service_integration

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#_any_subscriptions_to_notify?, #_backfill_state_change_fields, #_backfillers, #_clear_backfill_information, #_clear_webook_information, #_coalesce_excluded_on_update, #_enqueue_backfill_jobs, #_fetch_enrichment, #_find_dependency_candidate, #_notify_dependents, #_parallel_backfill, #_publish_rowupsert, #_store_enrichment_body?, #_to_json, #_upsert_update_expr, #_upsert_webhook, #_verify_backfill_err_msg, #_webhook_state_change_fields, #admin_dataset, #backfill, #calculate_and_backfill_state_machine, #calculate_backfill_state_machine, #calculate_dependency_state_machine_step, #calculate_preferred_create_state_machine, chunked_row_update_bounds, #clear_backfill_information, #clear_webhook_information, #create_table, #create_table_modification, #data_column, #dbadapter_table, #denormalized_columns, #descriptor, #dispatch_request_to, #enqueue_sync_targets, #enrichment_column, #ensure_all_columns, #ensure_all_columns_modification, #find_dependent, #find_dependent!, #indices, #initialize, #preferred_create_state_machine_method, #preprocess_headers_for_logging, #primary_key_column, #process_state_change, #process_webhooks_synchronously?, #qualified_table_sequel_identifier, #readonly_dataset, #remote_key_column, #requires_sequence?, #resource_name_plural, #resource_name_singular, #schema_and_table_symbols, #storable_columns, #synchronous_processing_response_body, #timestamp_column, #upsert_has_deps?, #upsert_webhook, #upsert_webhook_body, #verify_backfill_credentials, #webhook_endpoint, #webhook_response

Constructor Details

This class inherits a constructor from Webhookdb::Replicator::Base

Class Method Details

._compact_vevent_lines(lines) ⇒ String

Parameters:

  • lines (Array<String>)

Returns:

  • (String)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 227

def self._compact_vevent_lines(lines)
  # Walk backwards from the end, joining continuation lines.
  # Very hard to reason about this if it's written using normal array stuff.
  (1..(lines.length - 1)).reverse_each do |idx|
    line = lines[idx]
    prevline = lines[idx - 1]
    next unless line.start_with?(/\s+/)
    line.lstrip!
    prevline << line
    lines.delete_at(idx)
  end
  s = lines.join("\n")
  return s
end

._parse_line(input) ⇒ Object

Parameters:

  • input (String)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 316

def self._parse_line(input)
  parts = /#{LINE}/o.match(input)
  return input, nil, {} if parts.nil?
  params = {}
  parts[:params].scan(/#{PARAM}/o) do |match|
    param_name = match[0]
    # params[param_name] ||= []
    match[1].scan(/#{PVALUE}/o) do |param_value|
      if param_value.size.positive?
        param_value = param_value.gsub(/\A"|"\z/, "")
        params[param_name] = param_value
        # params["x-tz-info"] = timezone_store.retrieve param_value if param_name == "tzid"
      end
    end
  end
  return parts[:name], parts[:value], params
end

._parse_time_with_tzid(value, tzid) ⇒ Object

Given a tzid and value for a timestamp, return a Time (with a timezone). While there’s no formal naming scheme, we see the following forms:

  • valid names like America/Los_Angeles, US/Eastern

  • dashes, like America-Los_Angeles, US-Eastern

  • Offsets, like GMT-0700’

In theory this can be any value, and must be given in the calendar feed (VTIMEZONE). However that is extremely difficult; even the icalendar gem doesn’t seem to do it 100% right. We can solve for this if needed; in the meantime, log it in Sentry and use UTC.

If the zone cannot be parsed, assume UTC.

Return a tuple of [Time, true if the zone could be parsed]. If the zone cannot be parsed, you usually want to log or store it.



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 348

def self._parse_time_with_tzid(value, tzid)
  if (zone = Time.find_zone(tzid.tr("-", "/")))
    return [zone.parse(value), true]
  end
  if /^(GMT|UTC)[+-]\d\d\d\d$/.match?(tzid)
    offset = tzid[3..]
    return [Time.parse(value + offset), true]
  end
  if (zone = Webhookdb::WindowsTZ.windows_name_to_tz[tzid])
    return [zone.parse(value), true]
  end
  zone = Time.find_zone!("UTC")
  return [zone.parse(value), false]
end

.descriptorWebhookdb::Replicator::Descriptor



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 12

def self.descriptor
  return Webhookdb::Replicator::Descriptor.new(
    name: "icalendar_event_v1",
    ctor: ->(sint) { Webhookdb::Replicator::IcalendarEventV1.new(sint) },
    dependency_descriptor: Webhookdb::Replicator::IcalendarCalendarV1.descriptor,
    feature_roles: [],
    resource_name_singular: "iCalendar Event",
    supports_webhooks: true,
    description: "Individual events in an icalendar. See icalendar_calendar_v1.",
    api_docs_url: "https://icalendar.org/",
  )
end

.entry_is_date_str?(e) ⇒ Boolean

Returns:

  • (Boolean)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 41

def self.entry_is_date_str?(e) = self.value_is_date_str?(e.fetch("v"))

.entry_to_date(entry) ⇒ Date?

Returns:

  • (Date, nil)

Raises:

  • (ArgumentError)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 58

def self.entry_to_date(entry)
  value = entry.fetch("v")
  raise ArgumentError, "must pass a date string" unless self.value_is_date_str?(value)
  return Date.strptime(value, "%Y%m%d")
end

.entry_to_date_or_datetime(entry) ⇒ Array<Time,Date,true,false,nil>

Return tuple of parsed date or datetime, and a boolean of whether the timezone could be parsed (true if date was parsed).

Returns:

  • (Array<Time,Date,true,false,nil>)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 36

def self.entry_to_date_or_datetime(entry)
  return [self.entry_to_date(entry), true] if self.value_is_date_str?(entry.fetch("v"))
  return self.entry_to_datetime(entry)
end

.entry_to_datetime(entry) ⇒ Array<Time,true,false,nil>

Return tuple of parsed datetime, and a boolean of whether the timezone could be parsed.

Returns:

  • (Array<Time,true,false,nil>)

Raises:

  • (ArgumentError)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 47

def self.entry_to_datetime(entry)
  value = entry.fetch("v")
  raise ArgumentError, "do not pass a date string" if self.value_is_date_str?(value)
  return [Time.strptime(value, "%Y%m%dT%H%M%S%Z"), true] if value.end_with?("Z")
  if (tzid = entry["TZID"])
    return self._parse_time_with_tzid(value, tzid)
  end
  return [Time.find_zone!("UTC").parse(value), false]
end

.value_is_date_str?(v) ⇒ Boolean

Returns:

  • (Boolean)


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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 42

def self.value_is_date_str?(v) = v.length === 8

.vevent_to_hash(vevent_lines) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 242

def self.vevent_to_hash(vevent_lines)
  result = {}
  vevent_str = self._compact_vevent_lines(vevent_lines)
  nest_depth = 0
  vevent_str.lines.each do |line|
    if line.start_with?("BEGIN")
      nest_depth += 1
      next
    elsif line.start_with?("END")
      nest_depth -= 1
      next
    end
    next if nest_depth > 1
    line.strip!
    next if line.empty?
    keyname, value, params = self._parse_line(line)
    unless value.nil?
      value.gsub!("\\r\\n", "\r\n")
      value.gsub!("\\n", "\n")
      value.gsub!("\\t", "\t")
      # This line is not tested, since replicating issues with HTTP body encoding
      # is really tricky (while I love Ruby's unicode handling, trying to replicate
      # invalid data from other sources is a pain).
      # However we do get invalid unicode sequences, like:
      #   DESCRIPTION:\r\nNFL regional registration opens 9/25 and ends 11/20\XAOwww.nflflag.com
      # which cannot be encoded in JSON:
      #   Invalid Unicode [a0 77 77 77 2e] at 52 (JSON::GeneratorError)
      # The only way I can think to handle this is with replacing invalid utf-8 chars
      # (with the unicode questionmark icon), so they can be represented as JSON.
      # This fix is here, and not in `Base#_to_json` (like the null char fixes),
      # since I think this is an issue with feeds like icalendar,
      # and not something to handle generally
      # (we may also see this in something like Atom, but perhaps because
      # atom is XML, not a 'plain' text format, it'll be more rare).
      value.encode!("UTF-8", invalid: :replace, undef: :replace)
    end
    entry = {"v" => value}
    entry.merge!(params)
    if ARRAY_KEYS.include?(keyname)
      result[keyname] ||= []
      result[keyname] << entry
    else
      result[keyname] = entry
    end
  end
  return result
end

Instance Method Details

#_denormalized_columnsObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 124

def _denormalized_columns
  col = Webhookdb::Replicator::Column
  tsconv = {converter: CONV_DATETIME}
  dateconv = {converter: CONV_DATE}
  return [
    col.new(:calendar_external_id, TEXT, index: true),
    col.new(:uid, TEXT, data_key: ["UID", "v"], index: true),
    col.new(:row_updated_at, TIMESTAMP, index: true),
    col.new(:last_modified_at,
            TIMESTAMP,
            index: true,
            data_key: "LAST-MODIFIED",
            defaulter: :now,
            optional: true,
            **tsconv,),
    col.new(:created_at, TIMESTAMP, optional: true, data_key: "CREATED", **tsconv),
    col.new(:start_at, TIMESTAMP, index: true, index_not_null: true, data_key: "DTSTART", **tsconv),
    # This is True when start/end at fields are missing timezones in the underlying feed.
    # Their timestamps are in UTC.
    col.new(:missing_timezone, BOOLEAN, data_key: "DTSTART", converter: CONV_MISSING_TZ),
    col.new(:end_at, TIMESTAMP, index: true, index_not_null: true, data_key: "DTEND", optional: true, **tsconv),
    col.new(:start_date, DATE, index: true, index_not_null: true, data_key: "DTSTART", **dateconv),
    col.new(:end_date, DATE, index: true, index_not_null: true, data_key: "DTEND", optional: true, **dateconv),
    col.new(:status, TEXT, data_key: ["STATUS", "v"], optional: true),
    col.new(:categories, TEXT_ARRAY, data_key: ["CATEGORIES"], optional: true, converter: CONV_COMMA_SEP_ARRAY),
    col.new(:priority, INTEGER, data_key: ["PRIORITY", "v"], optional: true, converter: col::CONV_TO_I),
    col.new(:geo_lat, DECIMAL, data_key: ["GEO", "v"], optional: true, converter: CONV_GEO_LAT),
    col.new(:geo_lng, DECIMAL, data_key: ["GEO", "v"], optional: true, converter: CONV_GEO_LNG),
    col.new(:classification, TEXT, data_key: ["CLASS", "v"], optional: true),
    col.new(:recurring_event_id, TEXT, optional: true, index: true, index_not_null: true),
    col.new(:recurring_event_sequence, INTEGER, optional: true),
  ]
end

#_extra_index_specsArray<Webhookdb::Replicator::IndexSpec>



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 208

def _extra_index_specs
  return [
    Webhookdb::Replicator::IndexSpec.new(
      columns: [:calendar_external_id, :start_at, :end_at],
      where: Sequel[:status].is_distinct_from("CANCELLED") & (Sequel[:start_at] !~ nil),
    ),
    Webhookdb::Replicator::IndexSpec.new(
      columns: [:calendar_external_id, :start_date, :end_date],
      where: Sequel[:status].is_distinct_from("CANCELLED") & (Sequel[:start_date] !~ nil),
    ),
  ]
end

#_prepare_for_insert(resource, event, request, enrichment) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 172

def _prepare_for_insert(resource, event, request, enrichment)
  h = super
  # Events can have a DTSTART, but no DTEND.
  # https://icalendar.org/iCalendar-RFC-5545/3-6-1-event-component.html
  # In these cases, we need to:
  # - Use the duration, given.
  # - Dates default to the next day.
  # - Times default to start time.
  if (_implicit_end_time = h[:start_at] && !h[:end_at])
    self._set_implicit_end_at(resource, h)
  elsif (_implicit_end_date = h[:start_date] && !h[:end_date])
    self._set_implicit_end_date(resource, h)
  end
  return h
end

#_remote_key_columnObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 113

def _remote_key_column
  return Webhookdb::Replicator::Column.new(
    :compound_identity,
    TEXT,
    data_key: "<compound key, see converter>",
    index: true,
    converter: CONV_REMOTE_KEY,
    optional: true, # This is done via the converter, data_key never exists
  )
end

#_resource_and_event(request) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 160

def _resource_and_event(request)
  return request.body, nil
end

#_resource_to_data(r) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 164

def _resource_to_data(r, *)
  data = r.dup
  data.delete("calendar_external_id")
  data.delete("recurring_event_id")
  data.delete("recurring_event_sequence")
  return data
end

#_set_implicit_end_at(resource, h) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 198

def _set_implicit_end_at(resource, h)
  if (d = resource["DURATION"])
    dur = ActiveSupport::Duration.parse(d.fetch("v"))
    h[:end_at] = h[:start_at] + dur
    return
  end
  h[:end_at] = h[:start_at]
end

#_set_implicit_end_date(resource, h) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 188

def _set_implicit_end_date(resource, h)
  if (d = resource["DURATION"])
    # See https://icalendar.org/iCalendar-RFC-5545/3-3-6-duration.html
    dur = ActiveSupport::Duration.parse(d.fetch("v"))
    h[:end_date] = h[:start_date] + dur
    return
  end
  h[:end_date] = h[:start_date] + 1.day
end

#_timestamp_column_nameObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 158

def _timestamp_column_name = :last_modified_at

#_update_where_exprObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 221

def _update_where_expr
  return self.qualified_table_sequel_identifier[:last_modified_at] < Sequel[:excluded][:last_modified_at]
end

#_webhook_response(_request) ⇒ Object



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 111

def _webhook_response(_request) = Webhookdb::WebhookResponse.ok

#backfill_not_supported_messageObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 429

def backfill_not_supported_message
  return %(#{self.resource_name_singular} does not support backfilling.
See https://docs.webhookdb.com/guides/icalendar/ for instructions on setting up your integration.

You can POST 'SYNC' messages to WebhookDB to force-sync a user's feed,
though keep in mind calendar providers only refresh feeds periodically.)
end

#calculate_webhook_state_machineObject



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 416

def calculate_webhook_state_machine
  if (step = self.calculate_dependency_state_machine_step(dependency_help: ""))
    return step
  end
  step = Webhookdb::Replicator::StateMachineStep.new
  step.output = %(Great! You are all set.
Refer to https://docs.webhookdb.com/guides/icalendar/ for detailed instructions
on syncing data from iCalendar/ics feeds.

#{self._query_help_output(prefix: "Once data is available, you can query #{self.resource_name_plural}")})
  return step.completed
end

#delete_stale_cancelled_events(stale_at: Webhookdb::Icalendar.stale_cancelled_event_threshold_days.days.ago, age_cutoff: (Webhookdb::Icalendar.stale_cancelled_event_threshold_days + 10).days.ago, chunk_size: 10_000) ⇒ Object

Delete CANCELLED events last updated (row_updated_at)‘ in the window between stale_at to age_cutoff. This avoids endlessly adding to the icalendar events table due to feeds that change UIDs each fetch- events with changed UIDs will become CANCELLED, and then deleted over time.

Parameters:

  • stale_at (Time) (defaults to: Webhookdb::Icalendar.stale_cancelled_event_threshold_days.days.ago)

    When an event is considered ‘stale’. If stale events are a big problem, this can be shortened to just a few days.

  • age_cutoff (Time) (defaults to: (Webhookdb::Icalendar.stale_cancelled_event_threshold_days + 10).days.ago)

    Where to stop searching for old events. This is important to avoid a full table scale when deleting events, since otherwise it is like ‘row_updated_at < 35.days.ago’. Since this routine should run regularly, we should rarely have events more than 35 or 36 days old, for example. Use nil to use no limit (a full table scan) which may be necessary when running this feature for the first time.

  • chunk_size (Integer) (defaults to: 10_000)

    The row delete is done in chunks to avoid long locks. The default seems safe, but it’s exposed as a parameter if you need to play around with it, and can be done via configuration if needed at some point.



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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 384

def delete_stale_cancelled_events(
  stale_at: Webhookdb::Icalendar.stale_cancelled_event_threshold_days.days.ago,
  age_cutoff: (Webhookdb::Icalendar.stale_cancelled_event_threshold_days + 10).days.ago,
  chunk_size: 10_000
)
  # Delete in chunks, like:
  #   DELETE from "public"."icalendar_event_v1_aaaa"
  #   WHERE pk IN (
  #     SELECT pk FROM "public"."icalendar_event_v1_aaaa"
  #     WHERE row_updated_at < (now() - '35 days'::interval)
  #     LIMIT 10000
  #   )
  age = age_cutoff..stale_at
  self.admin_dataset do |ds|
    chunk_ds = ds.where(row_updated_at: age, status: "CANCELLED").select(:pk).limit(chunk_size)
    loop do
      # Due to conflicts where a feed is being inserted while the delete is happening,
      # this may raise an error like:
      #   deadlock detected
      #   DETAIL:  Process 18352 waits for ShareLock on transaction 435085606; blocked by process 24191.
      #   Process 24191 waits for ShareLock on transaction 435085589; blocked by process 18352.
      #   HINT:  See server log for query details.
      #   CONTEXT:  while deleting tuple (2119119,3) in relation "icalendar_event_v1_aaaa"
      # Unit testing this is very difficult though, and in practice it is rare,
      # and normal Sidekiq job retries should be sufficient to handle this.
      # So we don't explicitly handle deadlocks, but could if it becomes an issue.
      deleted = ds.where(pk: chunk_ds).delete
      break if deleted != chunk_size
    end
  end
end

#documentation_urlObject



9
# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 9

def documentation_url = Webhookdb::Icalendar::DOCUMENTATION_URL

#on_dependency_webhook_upsert(_ical_svc, _ical_row) ⇒ Object



363
364
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# File 'lib/webhookdb/replicator/icalendar_event_v1.rb', line 363

def on_dependency_webhook_upsert(_ical_svc, _ical_row, **)
  # We use an async job to sync when the dependency syncs
  return
end