Comments (8)
Just FYI, I'm implementing similar feature (but C layer) https://github.com/nurse/msgpack-ruby/blob/94af4e565a1a849740acd11ba7623df2faa0f84c/ext/msgpack/unpacker.c#L918
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I found that what I really want is a method to know how many msgpack objects exist in a binary. Hmm.
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@nurse I updated the description above. Is it still similar to yours?
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Your proposal needs a cursor (or an API to really skip objects without allocating objects). Mime contains such implementation as a cursor, but yours seems to want to move the unpacker's position.
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Doesn't Unpacker#read_array_header
or Unpacker#read_map_header
work?
But anyways it sounds good idea to add methods in addition to above methods to tell:
- type of next value
- length of next str or bin
- type and length of next ext
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Returning a class instance (immutable struct) is better than Hash in terms of performance.
I think it should be 2 methods because checking types needs only 1 byte but checking length need more bytes:
class Unpacker
#
# Returns type of next value.
# This peeks 1 byte from the underlaying internal buffer.
#
# :nil, :string. :integer, :float, :array, :map, ...
#
# @return Symbol
def peek_next_type
end
#
# Returns ValueInfo of next value.
# This peeks 1 - 5 bytes from the underlaying internal buffer.
#
# @return ValueInfo or its subclass
def peek_next_value_info
end
end
class ValueInfo
# Returns type of the value (:string, :binary, :integer, ...)
def type
end
# Returns of size of string, binary, or extention value
def size
end
alias_method :length, :size
# Returns type id of extension value
def ext_type_id
end
# Returns true if type is :string or :binary
def raw?
end
# Returns true if type is :integer or :float
def number?
end
end
These are optional (My bet is that NOT adding them until some actually need them):
class Unpacker
#
# Returns format of next value
#
# :nil, :str8, :str16, :str32, :positive_fixint, :negative_fixint, ...
#
def peek_next_format
end
end
This is how msgpack-java designs data model around types:
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I think it's NOT good idea to add read_next_type
. Because moving cursor makes internal state of the Unpacker unusable. There're no methods to read payload only.
Adding such method as like msgpack-java does is another idea but it will need read_next_format
instead of read_next_type
to return MessageFormat class. Because read_next_type
doesn't tell length of the payload users need to read next. It's another topic.
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Is anyone actively requesting this API today? Does someone need it and they're having to do a hack to get around it? Anything like that?
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Related Issues (20)
- Does msgpack_each support nested calls in design principle? HOT 3
- Unpack "end of buffer reached" error on Windows HOT 13
- Extra bytes when loading string HOT 5
- Seg Fault in #load HOT 3
- msgpack.jar seems to be missing in v1.5.5 HOT 7
- Correct way to pack and unpack `Struct` instances. HOT 4
- Packer can overwrite earlier parts of its buffer in version 1.6.0 HOT 10
- jruby: `MessagePack::Unpacker#buffer` is missing
- [BUG] Failed to free an rmem pointer, memory leak? HOT 8
- Compile fails on older toolsets HOT 5
- undefined method `to_msgpack' for BigDecimal (NoMethodError) HOT 4
- Attempt to GC mark already marked object HOT 22
- Pass empty string into MessagePack::Unpacker.feed will stop further feeding valid string in version >= 1.7.0 HOT 1
- Amazon Linux 2 w Ruby 2.6.10 - msgpack requires Ruby version >= 2.5. HOT 1
- Write msgpack to msgpack HOT 2
- Pack as uint16 HOT 1
- Feature request: Time packer HOT 1
- Fix for platforms without compaction support not complete
- 10 extra bytes after the deserialized object HOT 1
- Is Ruby 3.3.0 supported? HOT 2
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