shard-crystal-db/spec/dummy_driver.cr
2017-12-29 20:13:34 -03:00

268 lines
5.1 KiB
Crystal

require "spec"
require "../src/db"
class DummyDriver < DB::Driver
def build_connection(context : DB::ConnectionContext) : DB::Connection
DummyConnection.new(context)
end
class DummyConnection < DB::Connection
def initialize(context)
super(context)
@connected = true
@@connections ||= [] of DummyConnection
@@connections.not_nil! << self
end
def self.connections
@@connections.not_nil!
end
def self.clear_connections
@@connections.try &.clear
end
def build_prepared_statement(query)
DummyStatement.new(self, query, true)
end
def build_unprepared_statement(query)
DummyStatement.new(self, query, false)
end
def last_insert_id : Int64
0
end
def check
raise DB::ConnectionLost.new(self) unless @connected
end
def disconnect!
@connected = false
end
def create_transaction
DummyTransaction.new(self)
end
protected def do_close
super
end
end
class DummyTransaction < DB::TopLevelTransaction
getter committed = false
getter rolledback = false
def initialize(connection)
super(connection)
end
def commit
super
@committed = true
end
def rollback
super
@rolledback = true
end
protected def create_save_point_transaction(parent, savepoint_name : String)
DummySavePointTransaction.new(parent, savepoint_name)
end
end
class DummySavePointTransaction < DB::SavePointTransaction
getter committed = false
getter rolledback = false
def initialize(parent, savepoint_name)
super(parent, savepoint_name)
end
def commit
super
@committed = true
end
def rollback
super
@rolledback = true
end
end
class DummyStatement < DB::Statement
property params
def initialize(connection, @query : String, @prepared : Bool)
@params = Hash(Int32 | String, DB::Any).new
super(connection)
raise DB::Error.new(query) if query == "syntax error"
end
protected def perform_query(args : Enumerable)
@connection.as(DummyConnection).check
set_params args
DummyResultSet.new self, @query
end
protected def perform_exec(args : Enumerable)
@connection.as(DummyConnection).check
set_params args
raise DB::Error.new("forced exception due to query") if @query == "raise"
DB::ExecResult.new 0i64, 0_i64
end
private def set_params(args)
@params.clear
args.each_with_index do |arg, index|
set_param(index, arg)
end
end
private def set_param(index, value : DB::Any)
@params[index] = value
end
private def set_param(index, value)
raise "not implemented for #{value.class}"
end
def prepared?
@prepared
end
protected def do_close
super
end
end
class DummyResultSet < DB::ResultSet
@top_values : Array(Array(String))
@values : Array(String)?
@@last_result_set : self?
def initialize(statement, query)
super(statement)
@top_values = query.split.map { |r| r.split(',') }.to_a
@column_count = @top_values.size > 0 ? @top_values[0].size : 2
@@last_result_set = self
end
protected def do_close
super
end
def self.last_result_set
@@last_result_set.not_nil!
end
def move_next
@values = @top_values.shift?
!!@values
end
def column_count
@column_count
end
def column_name(index)
"c#{index}"
end
def read
n = @values.not_nil!.shift?
raise "end of row" if n.is_a?(Nil)
return nil if n == "NULL"
if n == "?"
return (@statement.as(DummyStatement)).params[0]
end
return n
end
def read(t : String.class)
read.to_s
end
def read(t : String?.class)
read.try &.to_s
end
def read(t : Int32.class)
read(String).to_i32
end
def read(t : Int32?.class)
read(String?).try &.to_i32
end
def read(t : Int64.class)
read(String).to_i64
end
def read(t : Int64?.class)
read(String?).try &.to_i64
end
def read(t : Float32.class)
read(String).to_f32
end
def read(t : Float64.class)
read(String).to_f64
end
def read(t : Bytes.class)
case value = read
when String
ary = value.bytes
Slice.new(ary.to_unsafe, ary.size)
when Bytes
value
else
raise "#{value} is not convertible to Bytes"
end
end
end
end
DB.register_driver "dummy", DummyDriver
class Witness
getter count
def initialize(@count = 1)
end
def check
@count -= 1
end
end
def with_witness(count = 1)
w = Witness.new(count)
yield w
w.count.should eq(0), "The expected coverage was unmet"
end
def with_dummy(uri : String = "dummy://host?checkout_timeout=0.5")
DummyDriver::DummyConnection.clear_connections
DB.open uri do |db|
yield db
end
end
def with_dummy_connection(options = "")
with_dummy("dummy://host?checkout_timeout=0.5&#{options}") do |db|
db.using_connection do |cnn|
yield cnn.as(DummyDriver::DummyConnection)
end
end
end