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require 'spec_helper'
describe Mongo::Retryable do
let(:klass) do
Class.new do
include Mongo::Retryable
attr_reader :cluster
attr_reader :operation
def initialize(operation, cluster)
@operation = operation
@cluster = cluster
end
def max_read_retries
cluster.max_read_retries
end
def read_retry_interval
cluster.read_retry_interval
end
def read
read_with_retry do
operation.execute
end
end
def write
write_with_retry(nil, nil) do
operation.execute
end
end
end
end
let(:operation) do
double('operation')
end
let(:cluster) do
double('cluster', next_primary: server_selector)
end
let(:server_selector) do
double('server_selector', select_server: double('server'))
end
let(:retryable) do
klass.new(operation, cluster)
end
describe '#read_with_retry' do
context 'when no exception occurs' do
before do
expect(operation).to receive(:execute).and_return(true)
end
it 'executes the operation once' do
expect(retryable.read).to be true
end
end
context 'when a socket error occurs' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::SocketError).ordered
expect(cluster).to receive(:max_read_retries).and_return(1).ordered
expect(cluster).to receive(:scan!).and_return(true).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'executes the operation twice' do
expect(retryable.read).to be true
end
end
context 'when a socket timeout error occurs' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::SocketTimeoutError).ordered
expect(cluster).to receive(:max_read_retries).and_return(1).ordered
expect(cluster).to receive(:scan!).and_return(true).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'executes the operation twice' do
expect(retryable.read).to be true
end
end
context 'when an operation failure occurs' do
context 'when the cluster is not a mongos' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::OperationFailure).ordered
expect(cluster).to receive(:sharded?).and_return(false)
end
it 'raises an exception' do
expect {
retryable.read
}.to raise_error(Mongo::Error::OperationFailure)
end
end
context 'when the cluster is a mongos' do
context 'when the operation failure is not retryable' do
let(:error) do
Mongo::Error::OperationFailure.new('not authorized')
end
before do
expect(operation).to receive(:execute).and_raise(error).ordered
expect(cluster).to receive(:sharded?).and_return(true)
end
it 'raises the exception' do
expect {
retryable.read
}.to raise_error(Mongo::Error::OperationFailure)
end
end
context 'when the operation failure is retryable' do
let(:error) do
Mongo::Error::OperationFailure.new('no master')
end
context 'when the retry succeeds' do
before do
expect(operation).to receive(:execute).and_raise(error).ordered
expect(cluster).to receive(:sharded?).and_return(true)
expect(cluster).to receive(:max_read_retries).and_return(1).ordered
expect(cluster).to receive(:read_retry_interval).and_return(0.1).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'returns the result' do
expect(retryable.read).to be true
end
end
context 'when the retry fails once and then succeeds' do
before do
expect(operation).to receive(:execute).and_raise(error).ordered
expect(cluster).to receive(:sharded?).and_return(true)
expect(cluster).to receive(:max_read_retries).and_return(2).ordered
expect(cluster).to receive(:read_retry_interval).and_return(0.1).ordered
expect(operation).to receive(:execute).and_raise(error).ordered
expect(cluster).to receive(:sharded?).and_return(true)
expect(cluster).to receive(:max_read_retries).and_return(2).ordered
expect(cluster).to receive(:read_retry_interval).and_return(0.1).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'returns the result' do
expect(retryable.read).to be true
end
end
end
end
end
end
describe '#write_with_retry' do
context 'when no exception occurs' do
before do
expect(operation).to receive(:execute).and_return(true)
end
it 'executes the operation once' do
expect(retryable.write).to be true
end
end
context 'when a not master error occurs' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::OperationFailure.new('not master')).ordered
expect(cluster).to receive(:scan!).and_return(true).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'executes the operation twice' do
expect(retryable.write).to be true
end
end
context 'when a not primary error occurs' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::OperationFailure.new('Not primary')).ordered
expect(cluster).to receive(:scan!).and_return(true).ordered
expect(operation).to receive(:execute).and_return(true).ordered
end
it 'executes the operation twice' do
expect(retryable.write).to be true
end
end
context 'when a normal operation failure occurs' do
before do
expect(operation).to receive(:execute).and_raise(Mongo::Error::OperationFailure).ordered
end
it 'raises an exception' do
expect {
retryable.write
}.to raise_error(Mongo::Error::OperationFailure)
end
end
end
end
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