130 lines
3.7 KiB
Ruby
130 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Postgresql::ReplicationSlot do
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describe '.in_use?' do
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it 'returns true when replication slots are present' do
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expect(described_class).to receive(:exists?).and_return(true)
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expect(described_class.in_use?).to be_truthy
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end
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it 'returns false when replication slots are not present' do
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expect(described_class.in_use?).to be_falsey
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end
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it 'returns false if the existence check is invalid' do
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expect(described_class).to receive(:exists?).and_raise(ActiveRecord::StatementInvalid.new('PG::FeatureNotSupported'))
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expect(described_class.in_use?).to be_falsey
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end
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end
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describe '.lag_too_great?' do
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before do
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expect(described_class).to receive(:in_use?).and_return(true)
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end
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it 'does not raise an exception' do
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expect { described_class.lag_too_great? }.not_to raise_error
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end
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it 'returns true when replication lag is too great' do
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expect(described_class)
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.to receive(:pluck)
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.and_return([125.megabytes])
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expect(described_class.lag_too_great?).to eq(true)
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end
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it 'returns false when more than one replicas is up to date enough' do
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expect(described_class)
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.to receive(:pluck)
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.and_return([125.megabytes, 0.megabytes, 0.megabytes])
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expect(described_class.lag_too_great?).to eq(false)
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end
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it 'returns false when replication lag is not too great' do
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expect(described_class)
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.to receive(:pluck)
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.and_return([0.megabytes])
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expect(described_class.lag_too_great?).to eq(false)
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end
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it 'returns false when there is a nil replication lag' do
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expect(described_class)
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.to receive(:pluck)
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.and_return([0.megabytes, nil])
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expect(described_class.lag_too_great?).to eq(false)
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end
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end
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describe '#max_replication_slots' do
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it 'returns the maximum number of replication slots' do
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expect(described_class.max_replication_slots).to be >= 0
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end
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end
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context 'with enough slots available' do
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skip_examples = described_class.max_replication_slots <= described_class.count
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before(:all) do
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skip('max_replication_slots too small') if skip_examples
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@current_slot_count = ApplicationRecord
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.connection
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.execute("SELECT COUNT(*) FROM pg_replication_slots;")
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.first
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.fetch('count')
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.to_i
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@current_unused_count = ApplicationRecord
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.connection
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.execute("SELECT COUNT(*) FROM pg_replication_slots WHERE active = 'f';")
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.first
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.fetch('count')
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.to_i
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ApplicationRecord
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.connection
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.execute("SELECT * FROM pg_create_physical_replication_slot('test_slot');")
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end
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after(:all) do
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unless skip_examples
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ApplicationRecord
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.connection
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.execute("SELECT pg_drop_replication_slot('test_slot');")
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end
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end
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describe '#slots_count' do
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it 'returns the number of replication slots' do
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expect(described_class.count).to eq(@current_slot_count + 1)
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end
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end
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describe '#unused_slots_count' do
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it 'returns the number of unused replication slots' do
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expect(described_class.unused_slots_count).to eq(@current_unused_count + 1)
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end
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end
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describe '#max_retained_wal' do
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it 'returns the retained WAL size' do
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expect(described_class.max_retained_wal).not_to be_nil
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end
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end
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describe '#slots_retained_bytes' do
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it 'returns the number of retained bytes' do
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slot = described_class.slots_retained_bytes.find {|x| x['slot_name'] == 'test_slot' }
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expect(slot).not_to be_nil
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expect(slot['retained_bytes']).to be_nil
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end
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end
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end
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end
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