Class: Mammoth::DeadLetterStore

Inherits:
Object
  • Object
show all
Defined in:
lib/mammoth/dead_letter_store.rb

Overview

Persists failed deliveries in Mammoth’s SQLite dead letter queue.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sqlite_store) ⇒ DeadLetterStore

Returns a new instance of DeadLetterStore.

Parameters:



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# File 'lib/mammoth/dead_letter_store.rb', line 12

def initialize(sqlite_store)
  @sqlite_store = sqlite_store
end

Instance Attribute Details

#sqlite_store ⇒ Object (readonly)

Returns the value of attribute sqlite_store.



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# File 'lib/mammoth/dead_letter_store.rb', line 9

def sqlite_store
  @sqlite_store
end

Instance Method Details

#count(status: nil) ⇒ Integer

Count dead letters by status.

Parameters:

  • status (String, nil) (defaults to: nil) —

    optional status

Returns:

  • (Integer) —

    dead letter count



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# File 'lib/mammoth/dead_letter_store.rb', line 79

def count(status: nil)
  if status
    database.get_first_value("SELECT COUNT(*) FROM dead_letters WHERE status = ?", [status])
  else
    database.get_first_value("SELECT COUNT(*) FROM dead_letters")
  end
end

#ignore(id) ⇒ void

This method returns an undefined value.

Mark a dead letter as ignored.

Parameters:

  • id (Integer) —

    dead letter id



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# File 'lib/mammoth/dead_letter_store.rb', line 99

def ignore(id)
  update_status(id, "ignored")
end

#pending(limit: 100) ⇒ Array<Hash>

Fetch pending dead letters.

Parameters:

  • limit (Integer) (defaults to: 100) —

    maximum number of rows

Returns:

  • (Array<Hash>) —

    pending dead letter rows



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# File 'lib/mammoth/dead_letter_store.rb', line 68

def pending(limit: 100)
  database.execute(
    "SELECT * FROM dead_letters WHERE status = ? ORDER BY failed_at ASC LIMIT ?",
    ["pending", limit]
  )
end

#resolve(id) ⇒ void

This method returns an undefined value.

Mark a dead letter as resolved.

Parameters:

  • id (Integer) —

    dead letter id



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# File 'lib/mammoth/dead_letter_store.rb', line 91

def resolve(id)
  update_status(id, "resolved")
end

#write(event:, destination_name:, error: nil, retry_count: 0) ⇒ Integer

Store a failed delivery.

Parameters:

  • event (Hash) —

    normalized event payload

  • destination_name (String) —

    destination name

  • error (Exception, nil) (defaults to: nil) —

    delivery failure

  • retry_count (Integer) (defaults to: 0) —

    number of delivery attempts

Returns:

  • (Integer) —

    inserted dead letter id



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# File 'lib/mammoth/dead_letter_store.rb', line 23

def write(event:, destination_name:, error: nil, retry_count: 0) # rubocop:disable Metrics/MethodLength
  now = Time.now.utc.iso8601
  payload = EventSerializer.call(event)
  database.execute(
    <<~SQL,
      INSERT INTO dead_letters(
        event_id,
        source_name,
        destination_name,
        operation,
        namespace,
        entity,
        source_position,
        payload_json,
        error_class,
        error_message,
        retry_count,
        status,
        failed_at,
        updated_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'pending', ?, ?)
    SQL
    [
      payload.fetch("event_id"),
      payload.fetch("source"),
      destination_name,
      payload.fetch("operation"),
      payload["namespace"],
      payload["entity"],
      payload["source_position"],
      JSON.generate(payload),
      error&.class&.name,
      error&.message,
      retry_count,
      now,
      now
    ]
  )
  database.last_insert_row_id
end