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require 'spec_helper'
describe 'change streams examples in Ruby', if: test_change_streams? do
let!(:inventory) do
client[:inventory]
end
let(:client) do
authorized_client.with(max_pool_size: 5, wait_queue_timeout: 3)
end
before do
inventory.drop
end
after do
client.close
inventory.drop
end
context 'example 1 - basic watching'do
it 'returns a change after an insertion' do
insert_thread = Thread.new do
sleep 2
inventory.insert_one(x: 1)
end
stream_thread = Thread.new do
# Start Changestream Example 1
cursor = inventory.watch.to_enum
next_change = cursor.next
# End Changestream Example 1
end
insert_thread.value
change = stream_thread.value
expect(change['_id']).not_to be_nil
expect(change['_id']['_data']).not_to be_nil
expect(change['operationType']).to eq('insert')
expect(change['fullDocument']).not_to be_nil
expect(change['fullDocument']['_id']).not_to be_nil
expect(change['fullDocument']['x']).to eq(1)
expect(change['ns']).not_to be_nil
expect(change['ns']['db']).to eq(TEST_DB)
expect(change['ns']['coll']).to eq(inventory.name)
expect(change['documentKey']).not_to be_nil
expect(change['documentKey']['_id']).to eq(change['fullDocument']['_id'])
end
end
context 'example 2 - full document update lookup specified' do
it 'returns a change and the delta after an insertion' do
inventory.insert_one(_id: 1, x: 2)
update_thread = Thread.new do
sleep 2
inventory.update_one({ _id: 1}, { '$set' => { x: 5 }})
end
stream_thread = Thread.new do
# Start Changestream Example 2
cursor = inventory.watch([], full_document: 'updateLookup').to_enum
next_change = cursor.next
# End Changestream Example 2
end
update_thread.value
change = stream_thread.value
expect(change['_id']).not_to be_nil
expect(change['_id']['_data']).not_to be_nil
expect(change['operationType']).to eq('update')
expect(change['fullDocument']).not_to be_nil
expect(change['fullDocument']['_id']).to eq(1)
expect(change['fullDocument']['x']).to eq(5)
expect(change['ns']).not_to be_nil
expect(change['ns']['db']).to eq(TEST_DB)
expect(change['ns']['coll']).to eq(inventory.name)
expect(change['documentKey']).not_to be_nil
expect(change['documentKey']['_id']).to eq(1)
expect(change['updateDescription']).not_to be_nil
expect(change['updateDescription']['updatedFields']).not_to be_nil
expect(change['updateDescription']['updatedFields']['x']).to eq(5)
expect(change['updateDescription']['removedFields']).to eq([])
end
end
context 'example 3 - resuming from a previous change' do
it 'returns the correct change when resuming' do
stream = inventory.watch
cursor = stream.to_enum
inventory.insert_one(x: 1)
next_change = cursor.next
expect(next_change['_id']).not_to be_nil
expect(next_change['_id']['_data']).not_to be_nil
expect(next_change['operationType']).to eq('insert')
expect(next_change['fullDocument']).not_to be_nil
expect(next_change['fullDocument']['_id']).not_to be_nil
expect(next_change['fullDocument']['x']).to eq(1)
expect(next_change['ns']).not_to be_nil
expect(next_change['ns']['db']).to eq(TEST_DB)
expect(next_change['ns']['coll']).to eq(inventory.name)
expect(next_change['documentKey']).not_to be_nil
expect(next_change['documentKey']['_id']).to eq(next_change['fullDocument']['_id'])
inventory.insert_one(x: 2)
next_next_change = cursor.next
stream.close
expect(next_next_change['_id']).not_to be_nil
expect(next_next_change['_id']['_data']).not_to be_nil
expect(next_next_change['operationType']).to eq('insert')
expect(next_next_change['fullDocument']).not_to be_nil
expect(next_next_change['fullDocument']['_id']).not_to be_nil
expect(next_next_change['fullDocument']['x']).to eq(2)
expect(next_next_change['ns']).not_to be_nil
expect(next_next_change['ns']['db']).to eq(TEST_DB)
expect(next_next_change['ns']['coll']).to eq(inventory.name)
expect(next_next_change['documentKey']).not_to be_nil
expect(next_next_change['documentKey']['_id']).to eq(next_next_change['fullDocument']['_id'])
# Start Changestream Example 3
resume_token = next_change['_id']
cursor = inventory.watch([], resume_after: resume_token).to_enum
resumed_change = cursor.next
# End Changestream Example 3
expect(resumed_change.length).to eq(next_next_change.length)
resumed_change.each { |key| expect(resumed_change[key]).to eq(next_next_change[key]) }
end
end
context 'example 4 - using a pipeline to filter changes' do
it 'returns the filtered changes' do
ops_thread = Thread.new do
sleep 2
inventory.insert_one(username: 'wallace')
inventory.insert_one(username: 'alice')
inventory.delete_one(username: 'wallace')
end
stream_thread = Thread.new do
# Start Changestream Example 4
pipeline = [ {'$match' => { '$or' => [{ 'fullDocument.username' => 'alice' },
{ 'operationType' => 'delete' }] } }]
cursor = inventory.watch(pipeline).to_enum
cursor.next
# End Changestream Example 4
end
ops_thread.value
change = stream_thread.value
expect(change['_id']).not_to be_nil
expect(change['_id']['_data']).not_to be_nil
expect(change['operationType']).to eq('insert')
expect(change['fullDocument']).not_to be_nil
expect(change['fullDocument']['_id']).not_to be_nil
expect(change['fullDocument']['username']).to eq('alice')
expect(change['ns']).not_to be_nil
expect(change['ns']['db']).to eq(TEST_DB)
expect(change['ns']['coll']).to eq(inventory.name)
expect(change['documentKey']).not_to be_nil
expect(change['documentKey']['_id']).to eq(change['fullDocument']['_id'])
end
end
end
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