go.shabbyrobe.org/msgplens

msgplens: Msgpack inspection tool

Swiss-army knife for inspecting msgpack objects.

To install:

go install go.shabbyrobe.org/msgplens/cmd/msgplens@latest

msgplens has the following features:

• Pretty-print msgpack objects
• Lossless JSON representation (-inf repr, -outf repr)
• Lossy JSON representation (-inf json, -outf json)
• Accepts several different input encodings (-inenc b64, -inenc hex, etc)
• Everything useful is exported from the go.shabbyrobe.org/msgplens library

And the following drawbacks:

• Code is not pretty yet
• Not much in the way of tests either
• Code quality is a bit of a mixed bag at the moment so the API isn't super stable

This tool cribs heavily from the unexported portions of http://github.com/tinylib/msgp, though it would be great if it could be exported and used as a dependency instead!

Examples

You can chop and dice inputs and outputs any way you like.

Read base64 encoded msgpack from STDIN, pretty print:

$ echo "gA==" | msgplens -inenc b64
at:0   sz:1   0x80 (128) Fixmap   len:0 {}

Read base64 encoded msgpack from STDIN, convert to lossy JSON:

$ echo "gaFhoWI=" | ./msgplens -inenc b64 -outf json
{"a":"b"}

Read hex encoded JSON from STDIN, pretty print:

$ echo '{"a": "b"}' | xxd -ps | ./msgplens -inf json -inenc hex
at:0   sz:1   0x81 (129) Fixmap   len:1 {
  K0  at:1   sz:2   0xa1 (161) Fixstr   "a"
  V0  at:3   sz:2   0xa1 (161) Fixstr   "b"
}