Mongo Rust Log Formatter

Converts MongoDB 4.4 log format to MongoDB 4.2 and prior style text logs

Features

• Converts JSON to text
• Optional output coloring
• Subprocess execution
• Demangles C++ names automatically
• Optional decoding of stacktraces using DWARF to give line numbers (Linux only)

Run

To read from standard in:

cat <file> | mrlog

To convert a file:

mrlog <optional file>

File is printed to standard out

Advanced Features:

To run a command and colorize its output:

mrlog -c -e python -- buildscripts/resmoke.py ...

Separate the command executable from its arguments with --.

To decode stacktraces using DWARF fromm mongod (Linux only).

mrlog --decode=mongod <optional file>

Options

Convertes MongoDB 4.4 JSON log format to text format. Writes converted file to stdout

USAGE:
    mrlog [FLAGS] [path-or-args]...

FLAGS:
    -c, --color
    -e, --execute    Execute command and process output
    -h, --help       Prints help information
        --id         Log id in text log
    -V, --version    Prints version information

OPTIONS:
    -d, --decode <decode>    Decode backtraces with DWARF information from binary, split symbols not supported
    -o, --output <output>    Output file, stdout if not present

ARGS:
    <path-or-args>...    Optional path to the file to read, defaults to stdin In execute mode, a command to run and
                         a list of args

Build

Get Rust from https://rustup.rs/.

cargo build --release

Note: Release builds are needed for good performance for decoding DWARF.

License

Apache 2.0

TODO

• make MongoDB json format specify the name of the main binary
• add support for coloring jstests
• color fatal and warning log messages
• https://github.com/BurntSushi/memchr ?