mpacklog.cpp

Log dictionaries to MessagePack files in C++.

Installation

Add a git repository rule to your Bazel WORKSPACE:

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
 
http_archive(
    name = "mpacklog",
    sha256 = "d9931db7fff526f6eae1421e0b12eef7e153b43722191d85e79fe85c9438b3ec",
    strip_prefix = "mpacklog.cpp-3.2.0",
    url = "https://github.com/stephane-caron/mpacklog.cpp/archive/refs/tags/v3.2.0.tar.gz",
)
 
load("@mpacklog//tools/workspace:default.bzl", add_mpacklog_repositories = "add_default_repositories")
 
# This adds dependencies such as @palimpsest for building mpacklog targets
add_mpacklog_repositories()

You can then use the @mpacklog dependency in your C++ targets.

Usage

The library is multi-threaded. Add messages to the log using the put function, they will be written to file in the background.

#include <mpacklog/Logger.h>
#include <palimpsest/Dictionary.h>
 
int main() {
    mpacklog::Logger logger("output.mpack");
 
    palimpsest::Dictionary dict;
    dict("something") = "foo";
 
    for (unsigned bar = 0; bar < 1000u; ++bar) {
        dict("bar") = bar;
        logger.put(dict):
    }
}

See also

• jq: manipulate JSON series to add, remove or extend fields.
• mpacklog.py: Sibling Python project with an mpacklog command-line tool to manipulate MessagePack files.
• rq: transform from/to MessagePack, JSON, YAML, TOML, ...