Module: SQLite3::FFI

Defined in:
lib/sqlite3/ffi/c_api.rb,
lib/sqlite3/ffi/utils.rb,
lib/sqlite3/ffi/version.rb,
lib/sqlite3/ffi/core_ext.rb,
lib/sqlite3/ffi/exception.rb,
lib/sqlite3/ffi/functions.rb,
lib/sqlite3/ffi/aggregator.rb

Defined Under Namespace

Modules: CApi, CoreExt Classes: AggregatorInstance, AggregatorWrapper

Constant Summary collapse

RB_ERRINFO = 
:sqlite3_ffi_rb_errinfo
OBJECT_REGISTRY = 
ObjectSpace::WeakMap.new
VERSION = 
"0.1.4"
COMPARATOR = 
::FFI::Function.new(:int, [:pointer, :int, :pointer, :int, :pointer]) do |ctx, a_len, a, b_len, b|
  comparator = unwrap(ctx)
  a_str = a.read_bytes(a_len).force_encoding(Encoding::UTF_8)
  b_str = b.read_bytes(b_len).force_encoding(Encoding::UTF_8)

  if Encoding.default_internal
    a_str = a_str.encode(Encoding.default_internal)
    b_str = b_str.encode(Encoding.default_internal)
  end

  comparator.compare(a_str, b_str)
end
TRACE = 
::FFI::Function.new(:int, [:uint, :pointer, :pointer, :pointer]) do |_, ctx, _, x|
  unwrap(ctx).call(x.read_string)
  0
end
AUTH = 
::FFI::Function.new(:int, [:pointer, :int, :string, :string, :string, :string]) do |ctx, op_id, s1, s2, s3, s4|
  result = unwrap(ctx).call(op_id, s1, s2, s3, s4)
  if result.is_a?(Integer)
    result
  elsif result == true
    CApi::SQLITE_OK
  elsif result == false
    CApi::SQLITE_DENY
  else
    CApi::SQLITE_IGNORE
  end
end
HASH_CALLBACK = 
::FFI::Function.new(:int, [:pointer, :int, :pointer, :pointer]) do |ctx, count, data, columns|
  callback_ary = unwrap(ctx)
  new_hash = {}
  data.read_array_of_pointer(count).zip(columns.read_array_of_pointer(count)) do |value, column|
    new_hash[column.read_string] = value.null? ? nil : value.read_string
  end
  callback_ary << new_hash
  0
end
REGULAR_CALLBACK = 
::FFI::Function.new(:int, [:pointer, :int, :pointer, :pointer]) do |ctx, count, data, columns|
  callback_ary = unwrap(ctx)
  new_ary = []
  data.read_array_of_pointer(count).each do |value|
    new_ary << (value.null? ? nil : value.read_string)
  end
  callback_ary << new_ary
  0
end
STATEMENT_TIMEOUT = 
::FFI::Function.new(:int, [:pointer]) do |ctx|
  ctx = unwrap(ctx)
  current_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  if ctx.instance_variable_get(:@stmt_deadline).nil?
    ctx.instance_variable_set(:@stmt_deadline, current_time)
    0
  elsif current_time >= ctx.instance_variable_get(:@stmt_deadline)
    1
  else
    0
  end
end
BUSY_HANDLER = 
::FFI::Function.new(:int, [:pointer, :int]) do |ctx, count|
  handler = unwrap(ctx).instance_variable_get(:@busy_handler)
  result = handler.(count)
  result == false ? 0 : 1
end
FUNC = 
::FFI::Function.new(:void, [:pointer, :int, :pointer]) do |ctx, argc, argv|
  callable = unwrap(CApi.sqlite3_user_data(ctx))
  params = argv.read_array_of_pointer(argc).map { |v| FFI.sqlite3val2rb(v) }
  result = callable.(*params)
  FFI.set_sqlite3_func_result(ctx, result)
end
AGGREGATOR_STEP = 
::FFI::Function.new(:void, [:pointer, :int, :pointer]) do |ctx, argc, argv|
  begin
    inst = aggregate_instance(ctx)
    handler_instance = inst.handler_instance
    params = argv.read_array_of_pointer(argc).map { |v| FFI.sqlite3val2rb(v) }
    handler_instance.step(*params)
  rescue => e
    FFI.rb_errinfo = e
  end
end
AGGREGATOR_FINAL = 
::FFI::Function.new(:void, [:pointer]) do |ctx|
  begin
    inst = aggregate_instance(ctx)
    handler_instance = inst.handler_instance
    result = handler_instance.finalize
    FFI.set_sqlite3_func_result(ctx, result)
    aggregate_instance_destroy(ctx)
  rescue => e
    FFI.rb_errinfo = e
  end
end

Class Method Summary collapse

Class Method Details

.aggregate_instance(ctx) ⇒ Object 



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# File 'lib/sqlite3/ffi/aggregator.rb', line 16

def self.aggregate_instance(ctx)
  aw = FFI.unwrap(CApi.sqlite3_user_data(ctx))
  handler_klass = aw.handler_klass
  inst_ptr = CApi.sqlite3_aggregate_context(ctx, 8)

  if inst_ptr.null?
    fatal "SQLite is out-of-merory"
  end

  if inst_ptr.read_pointer.null?
    instances = aw.instances

    inst = AggregatorInstance.new
    inst.handler_instance = handler_klass.new
    instances << inst
    inst_ptr.write_pointer(FFI.wrap(inst))
  else
    inst = FFI.unwrap(inst_ptr.read_pointer)
  end

  if inst.nil?
    fatal "SQLite called us back on an already destroyed aggregate instance"
  end

  inst
end

.aggregate_instance_destroy(ctx) ⇒ Object 



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# File 'lib/sqlite3/ffi/aggregator.rb', line 43

def self.aggregate_instance_destroy(ctx)
  aw = FFI.unwrap(CApi.sqlite3_user_data(ctx))
  instances = aw.instances
  inst_ptr = CApi.sqlite3_aggregate_context(ctx, 0)

  if inst_ptr.null? || inst_ptr.read_pointer.null?
    return
  end

  inst = FFI.unwrap(inst_ptr.read_pointer)

  if inst.nil?
    fatal "attempt to destroy aggregate instance twice"
  end

  inst.handler_instance = nil
  if instances.delete(inst).nil?
    fatal "must be in instances at that point"
  end

  inst_ptr.write_pointer(::FFI::Pointer.new(0))
end

.check(db, status) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 3

def self.check(db, status)
  raise_(db, status)
end

.check_msg(db, status, msg) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 7

def self.check_msg(db, status, msg)
  raise_msg(db, status, msg)
end

.check_prepare(db, status, sql) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 11

def self.check_prepare(db, status, sql)
  raise_with_sql(db, status, sql)
end

.interned_utf8_cstr(str) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 41

def self.interned_utf8_cstr(str)
  -str
end

.raise_(db, status) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 76

def self.raise_(db, status)
  klass = status2klass(status)
  return if klass.nil?

  exception = klass.new(CApi.sqlite3_errmsg(db))
  exception.instance_variable_set(:@code, status)

  raise exception
end

.raise_msg(db, status, msg) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 86

def self.raise_msg(db, status, msg)
  klass = status2klass(status)
  return if klass.nil?

  exception = klass.new(msg.read_pointer.read_string)
  exception.instance_variable_set(:@code, status)
  CApi.sqlite3_free(msg.read_pointer)

  raise exception
end

.raise_with_sql(db, status, sql) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 97

def self.raise_with_sql(db, status, sql)
  klass = status2klass(status)
  return if klass.nil?

  exception = klass.new(CApi.sqlite3_errmsg(db))
  exception.instance_variable_set(:@code, status)
  if sql
    exception.instance_variable_set(:@sql, sql)
    exception.instance_variable_set(:@sql_offset, CApi.sqlite3_error_offset(db))
  end

  raise exception
end

.rb_errinfo ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 63

def self.rb_errinfo
  Thread.current[RB_ERRINFO]
end

.rb_errinfo=(e) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 67

def self.rb_errinfo=(e)
  Thread.current[RB_ERRINFO] = e
end

.set_sqlite3_func_result(ctx, result) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 22

def self.set_sqlite3_func_result(ctx, result)
  case result
  when NilClass
    CApi.sqlite3_result_null(ctx)
  when Integer
    CApi.sqlite3_result_int64(ctx, result)
  when Float
    CApi.sqlite3_result_double(ctx, result)
  when String
    if result.is_a?(Blob) || result.encoding == Encoding::BINARY
      CApi.sqlite3_result_blob(ctx, result, result.bytesize, CApi::SQLITE_TRANSIENT)
    else
      CApi.sqlite3_result_text(ctx, result, result.bytesize, CApi::SQLITE_TRANSIENT)
    end
  else
    raise RuntimeError, "can't return #{result.class.name}"
  end
end

.sqlite3val2rb(val) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 3

def self.sqlite3val2rb(val)
  case CApi.sqlite3_value_type(val)
  when CApi::SQLITE_INTEGER
    CApi.sqlite3_value_int64(val)
  when CApi::SQLITE_FLOAT
    CApi.sqlite3_value_double(val)
  when CApi::SQLITE_TEXT
    len = CApi.sqlite3_value_bytes(val)
    CApi.sqlite3_value_text(val).read_bytes(len).force_encoding(Encoding::UTF_8).freeze
  when CApi::SQLITE_BLOB
    len = CApi.sqlite3_value_bytes(val)
    CApi.sqlite3_value_text(val).read_bytes(len).freeze
  when CApi::SQLITE_NULL
    nil
  else
    raise RuntimeError, "bad type"
  end
end

.status2klass(status) ⇒ Object 



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# File 'lib/sqlite3/ffi/exception.rb', line 15

def self.status2klass(status)
  case status & 0xff
  when 0
    nil
  when CApi::SQLITE_ERROR
    SQLite3::SQLException
  when CApi::SQLITE_INTERNAL
    SQLite3::InternalException
  when CApi::SQLITE_PERM
    SQLite3::PermissionException
  when CApi::SQLITE_ABORT
    SQLite3::AbortException
  when CApi::SQLITE_BUSY
    SQLite3::BusyException
  when CApi::SQLITE_LOCKED
    SQLite3::LockedException
  when CApi::SQLITE_NOMEM
    SQLite3::MemoryException
  when CApi::SQLITE_READONLY
    SQLite3::ReadOnlyException
  when CApi::SQLITE_INTERRUPT
    SQLite3::InterruptException
  when CApi::SQLITE_IOERR
    SQLite3::IOException
  when CApi::SQLITE_CORRUPT
    SQLite3::CorruptException
  when CApi::SQLITE_NOTFOUND
    SQLite3::NotFoundException
  when CApi::SQLITE_FULL
    SQLite3::FullException
  when CApi::SQLITE_CANTOPEN
    SQLite3::CantOpenException
  when CApi::SQLITE_PROTOCOL
    SQLite3::ProtocolException
  when CApi::SQLITE_EMPTY
    SQLite3::EmptyException
  when CApi::SQLITE_SCHEMA
    SQLite3::SchemaChangedException
  when CApi::SQLITE_TOOBIG
    SQLite3::TooBigException
  when CApi::SQLITE_CONSTRAINT
    SQLite3::ConstraintException
  when CApi::SQLITE_MISMATCH
    SQLite3::MismatchException
  when CApi::SQLITE_MISUSE
    SQLite3::MisuseException
  when CApi::SQLITE_NOLFS
    SQLite3::UnsupportedException
  when CApi::SQLITE_AUTH
    SQLite3::AuthorizationException
  when CApi::SQLITE_FORMAT
    SQLite3::FormatException
  when CApi::SQLITE_RANGE
    SQLite3::RangeException
  when CApi::SQLITE_NOTADB
    SQLite3::NotADatabaseException
  else
    SQLite3::Exception
  end
end

.string_value(obj) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 45

def self.string_value(obj)
  unless obj.respond_to?(:to_str)
    val =
      case obj
      when nil
        "nil"
      when true, false
        obj.to_s
      else
        obj.class.name
      end
    raise TypeError, "no implicit conversion of #{val} into String"
  end
  obj.to_str
end

.unwrap(ptr) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 78

def self.unwrap(ptr)
  OBJECT_REGISTRY[ptr.to_i] || (raise "object not found")
end

.wrap(obj) ⇒ Object 



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# File 'lib/sqlite3/ffi/utils.rb', line 73

def self.wrap(obj)
  OBJECT_REGISTRY[obj.object_id] = obj
  ::FFI::Pointer.new(obj.object_id)
end