CALF - CAPIO Logging Facility

CALF - CApio Logging Facility

C++ 17 Python 3.10-3.14

CALF is a structured, header-only C++17 logging library for the CAPIO ecosystem. It records RAII scopes and events in one of two file formats:

Perfetto is the preferred format. It produces compact, streaming .perfetto-trace files that open directly in the Perfetto UI.
JSON is the dependency-free fallback. It produces readable .log files containing valid, indented JSON.

CALF provides three logging backends:

StlLogger uses std::fstream and is intended for regular C++ processes.
SyscallLogger uses raw Linux syscalls and is intended for syscall interceptors or other environments where the STL is unsafe.
StdOutLogger writes human-readable messages to standard output.

StlLogger and SyscallLogger support both Perfetto and JSON with the same logging macros. The selected file format is fixed when a target is built.

Requirements

C++17 or later
CMake 3.16 or later
Linux when using SyscallLogger
Python 3.10 or later when using the Python bindings

Quick start

Add CALF with FetchContent:

include(FetchContent)

FetchContent_Declare(
  calf
  GIT_REPOSITORY https://github.com/High-Performance-IO/calf.git
  GIT_TAG <commit-sha> # Pin a commit for reproducible builds.
  GIT_SHALLOW TRUE
)

set(CALF_TESTS OFF CACHE BOOL "" FORCE)
set(CALF_BUILD_PYTHON_BINDINGS OFF CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(calf)

# Enables logging and selects Perfetto when CALF_PROTOBUF=ON.
calf_enable_log(my_server ON)

Use the logging macros in C++:

#include <calf/StlLogger.h>

void handle_request(int tid, const char *path) {
    START_LOG(tid, "path=%s", path);
    LOG("processing");
} // The scope closes and its end timestamp is recorded here.

By default, this writes a Perfetto trace to:

./calf_logs/<hostname>/calf_<pid>.perfetto-trace

Open the file in https://ui.perfetto.dev/.

Log formats

Perfetto format

Perfetto is selected when a target links to calf::protobuf. The calf_enable_log helper does this automatically when CALF_PROTOBUF=ON:

# Automatic: Perfetto if available, otherwise JSON.
calf_enable_log(my_server ON)

# Explicit: require Perfetto. Configuration fails if CALF_PROTOBUF=OFF.
calf_enable_log(my_server ON PROTOBUF)

You can also select it by linking the target directly:

target_link_libraries(my_server PRIVATE calf::protobuf)

CALF writes a standard Perfetto TrackEvent protobuf stream. Its logging model maps to Perfetto as follows:

CALF operation	Perfetto representation
`START_LOG(...)`	Slice begin on the calling thread's track
Scope destruction	Slice end on the same track
`LOG(...)`	Instant event on the same track
C++ function name	Event name
Formatted message	`args` debug annotation
Source file and line	Perfetto source location
Nested CALF scopes	Nested Perfetto slices

All threads in a process write to one trace:

$CALF_LOG_DIR/<hostname>/<component>_<pid>.perfetto-trace

Each thread has its own Perfetto track. Timestamps use the monotonic clock in nanoseconds. Writes are synchronized so packets from different threads cannot interleave. Separate processes always use separate files.

The trace is streamed as logging occurs; CALF does not build the complete trace in memory. StlLogger uses generated protobuf support for the schema, while SyscallLogger writes compatible protobuf bytes through raw syscalls.

JSON fallback

JSON is selected automatically by calf_enable_log(target ON) when CALF_PROTOBUF=OFF. It can also be requested explicitly:

# Disable protobuf support for the whole CALF build.
set(CALF_PROTOBUF OFF CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(calf)
calf_enable_log(my_server ON)

# Or keep protobuf available but use JSON for this target.
calf_enable_log(my_tool ON JSON)

Directly linking calf::stl or calf::syscall also uses JSON unless the target additionally receives the Perfetto configuration through calf::protobuf:

target_link_libraries(my_server PRIVATE calf::stl)
target_link_libraries(my_interceptor PRIVATE calf::syscall)

This is a build-time fallback. CALF does not switch formats at runtime or convert an existing Perfetto trace to JSON.

JSON output uses one file per thread:

$CALF_LOG_DIR/<component>/<hostname>/<prefix><tid>.log

The default prefix is stl_ for StlLogger and syscall_ for SyscallLogger. CALF_LOG_PREFIX overrides it.

Each file contains one root array. Every START_LOG scope is an object, and each LOG call is an event in that scope's events array:

[
  {
    "invoker": "capio_openat",
    "file": "posix/open.cpp",
    "line": 77,
    "ts_enter": 42,
    "args": "dirfd=4, pathname=/tmp/foo, flags=0",
    "events": [
      { "ts": 43, "invoker": "get_file_location", "file": "location.hpp", "line": 96, "args": "path=/tmp/foo" },
      { "ts": 44, "invoker": "get_file_location", "file": "location.hpp", "line": 96, "args": "file found on node host0" }
    ],
    "ts_exit": 45
  }
]

Scope fields:

Field	Meaning
`invoker`	Function that opened the scope
`file`, `line`	Source location of `START_LOG`
`ts_enter`	Scope start time in elapsed milliseconds
`args`	Expanded `START_LOG` format string
`events`	Ordered `LOG` events and any nested scopes
`ts_exit`	Scope end time in elapsed milliseconds

Event fields:

Field	Meaning
`ts`	Event time in elapsed milliseconds
`invoker`	Function associated with the enclosing logger
`file`, `line`	Source location associated with the logger
`args`	Expanded `LOG` format string

Strings are JSON-escaped, and the file remains valid JSON after each completed outer scope. Multiple outer scopes are appended to the same root array.

C++ usage

Regular processes

Use StlLogger in code where the C++ standard library is safe. Logging starts enabled on every thread:

#include <calf/StlLogger.h>

void handle_request(int tid, const char *path) {
    START_LOG(tid, "call(path=%s)", path);
    LOG("processing path=%s", path);
    LOG("done");
}

Syscall interceptors

Use SyscallLogger where logging must avoid intercepted STL I/O. This backend is Linux-only and starts disabled to prevent re-entrancy during setup. Enable it after initialization:

#include <calf/SyscallLogger.h>
#include <libsyscall_intercept_hook_point.h>

void setup() {
    SET_CALF_SYSCALL_HANDLER(syscall_no_intercept);
    ENABLE_LOGGER();
}

long hook(long syscall_number, ...) {
    START_LOG(capio_syscall(SYS_gettid), "call()");
    // Handle the syscall.
}

SET_CALF_SYSCALL_HANDLER redirects CALF's internal syscalls through syscall_no_intercept. Temporarily suspend logging around operations that must not be captured:

void internal_operation() {
    DISABLE_LOGGER(); // Logging is restored when this scope exits.
    // Perform internal syscalls.
}

Macros

Macro	Description
`START_LOG(tid, fmt, ...)`	Creates a scoped `Logger log` RAII object.
`LOG(fmt, ...)`	Adds an event to the current scope.
`ERR_EXIT(fmt, ...)`	Logs and terminates, or throws when configured to continue on error.
`ENABLE_LOGGER()`	Enables logging on the calling thread.
`DISABLE_LOGGER()`	Suspends logging until the current C++ scope exits.
`DBG(tid, lambda)`	Wraps a lambda in a debug-only scope; compiled out in release builds.
`SET_CALF_SYSCALL_HANDLER(handler)`	Sets the non-intercepted syscall handler for `SyscallLogger`.

Configuration

CMake options

Option	Default	Description
`CALF_LOG`	`ON`	Enables logging macros globally; when disabled, they are no-ops.
`CALF_PROTOBUF`	`ON`	Builds Perfetto support and the `calf::protobuf` target.
`CALF_PROTOBUF_FETCH`	`ON`	Fetches the required protobuf version when it is not installed.
`CALF_TESTS`	`OFF`	Builds and registers the C++ test suites.
`CALF_PYTHON_TESTS`	Value of `CALF_TESTS`	Builds the Python extension and registers binding tests.
`CALF_BUILD_PYTHON_BINDINGS`	`OFF`	Builds and installs the private `calf._py_calf` extension.
`CALF_DEFAULT_COMPONENT_NAME`	`calf`	Sets the default component used in paths and CLI headers.
`CALF_DEFAULT_LOG_DIR_NAME`	`./calf_logs`	Sets the log root used when `CALF_LOG_DIR` is unset.

Pass options during configuration with -D<option>=<value>:

# Build C++ and Python tests.
cmake -S . -B build -DCALF_TESTS=ON

# Build only C++ tests.
cmake -S . -B build -DCALF_TESTS=ON -DCALF_PYTHON_TESTS=OFF

# Build without protobuf and use JSON as the automatic format.
cmake -S . -B build -DCALF_PROTOBUF=OFF

# Override compiled-in output defaults.
cmake -S . -B build \
  -DCALF_DEFAULT_COMPONENT_NAME=my_component \
  -DCALF_DEFAULT_LOG_DIR_NAME=/var/log/calf

For individual targets, calf_set_component(target name) and calf_set_default_log_dir(target path) override the compiled-in defaults.

Environment variables

Variable	Description	Default
`CALF_LOG_DIR`	Root directory for Perfetto and JSON output.	`./calf_logs`
`CALF_LOG_PREFIX`	Prefix for per-thread JSON filenames; ignored by Perfetto.	`stl_` or `syscall_`

Environment variables are read by the process at runtime and override the compiled-in output directory and JSON prefix.

Python bindings

The Python package exposes the JSON-backed StlLogger and the human-readable StdoutLogger.

Install a published release:

python -m pip install capio-calf

Install from the repository for development:

python -m pip install -e .

Use calf.Logger, an alias for calf.StlLogger, as a context manager so its scope closes deterministically:

import calf

with calf.Logger("processing request") as logger:
    logger.log("reading input")
    logger.log("request complete")
    print(logger.log_file_name)

CALF detects the current Python function as the invoker. At module scope it uses the script name, and in an interactive session it uses python. The constructor accepts invoker, file, line, and tid overrides. If tid is omitted, CALF uses the current thread ID. close() can be used without a context manager, and get_log_file_name() returns the output path.

Configure stdout logging through StdoutLoggerOptions:

import calf

options = calf.StdoutLogger.get_options()
options.workflow_name = "example"
options.color = calf.CLI_LEVEL_INFO
options.print_header = True
options.use_color = True
calf.StdoutLogger.set_options(options)

with calf.StdoutLogger("starting") as logger:
    logger.log("working")

calf.StdoutLogger.print("finished")

Available colors are CLI_LEVEL_RESET, CLI_LEVEL_STATUS, CLI_LEVEL_INFO, CLI_LEVEL_WARNING, and CLI_LEVEL_ERROR.

Testing

The C++ tests use GoogleTest. Python binding tests use pytest. Both run on Linux and macOS, except the Linux-only raw syscall suites.

cmake -S . -B build -DCALF_TESTS=ON
cmake --build build --parallel
ctest --test-dir build --output-on-failure

Run only the Python binding test target with:

cmake --build build --target calf_python_tests

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Algorithm	Hash digest
SHA256	`39de28e912e332370cd283ae7d255e7fba74da82caa134ae4b6731445861973e`
MD5	`be6ce8056f751f347f154f53401974da`
BLAKE2b-256	`3f69d56fd87b16e25e609f944efeb572fa1b2f4b27a73bee9ca05ffa71006a0a`

Algorithm	Hash digest
SHA256	`c7922e0d8ddcca449be3ccce91bbe015fc3f9e89ab59a9e9289488bb0cb9a6a1`
MD5	`89cccc16a04bbfc75766014166a9fb55`
BLAKE2b-256	`0398bbe1752caee393317f3640f81059f20da599ec87ee9bb31139c5eff3b048`

Algorithm	Hash digest
SHA256	`b15ed982a7142f5ed5772b67ed90d13494a95cb8004797c200a0bafdc37c2efa`
MD5	`9a8dd0ee46f0d17fb6a169612038a7b7`
BLAKE2b-256	`69195429270340c759454e97352fd11b2a4d480fc54b29bf3ecd106d36807c0a`

Algorithm	Hash digest
SHA256	`3ca683da05f7101f6d4b47d6efe4fea73ce2bd373df30d098e473aa1a709625e`
MD5	`6cfc0ce0b3c1f637d0ef3a248996c245`
BLAKE2b-256	`3a7b37f2241f7b3d5edd23b54c6af1897ebf0217026b5c9e5bd1a320facc91e4`

capio-calf 0.3.0

CALF - CApio Logging Facility

Requirements

Quick start

Log formats

Perfetto format

JSON fallback

C++ usage

Regular processes

Syscall interceptors

Macros

Configuration

CMake options

Environment variables

Python bindings

Testing

Project links

Key dates

1 maintainer

Credits

License

Requires

Provides Extra

Download files

Source Distribution

Built Distributions

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Algorithm	Hash digest
SHA256	`f8dd3c9dd52c142a47e6616d5ef4607865f4295ca695a1edf9ae4ea82932d2c8`
MD5	`b6aaf88c63f01a2e1a707cb7a208922b`
BLAKE2b-256	`34c59c915b9452740cde3d69cf93387e3e69d3e2bd462418362dc787bd3a8800`

Algorithm	Hash digest
SHA256	`c327297359d3c9a437d36561af12c72c89cbf38b0e5a6fdbcaf8b0c8bc327934`
MD5	`cd7b0e2528ba8e72c0efc74530b2f0cf`
BLAKE2b-256	`da0e4ab45f767ec0bc6f36e39787e2d06010db370f9df63aa538ac77d8e35d9e`

Algorithm	Hash digest
SHA256	`271263b85357c2d7331e1bca951d630a963084b7192b2830246807e4477c90ed`
MD5	`fbd995626d3d14ff6b7109fc4905577b`
BLAKE2b-256	`c1c80d9424d92518f86a1dff254120449c8e016cb488ac84daa48fd6f7dc61ed`

Algorithm	Hash digest
SHA256	`849414fad8da35b760a0968a2e51426c0c2bf2473a80db2026feddc3aea62943`
MD5	`f0a7149b6846e1114bb3ba406fdc355d`
BLAKE2b-256	`b77d16295b6a60475980f9a4545cbc0bf655eb0eebc42b3f8bf399457b43d721`

Algorithm	Hash digest
SHA256	`a538a429ace7f1851e26757fd8846ba985cf75a569a0a785c6843646509039a1`
MD5	`b5cdde58d35c60dbdb9c692096607d2c`
BLAKE2b-256	`12062242acb1def5908caa0844f0553ba6037e03626c2fb51b653dfa2232f1af`

Algorithm	Hash digest
SHA256	`4c2a99a80637fecaeef0eb0b4eff26d526f6224ba4d3d216ea86768cbf5235bd`
MD5	`598624e3b7d1027b44f7ccb9489da72d`
BLAKE2b-256	`03c26e2960272a6135fdb2985da50eba96a8d50175581ff83cf0e136dc8c5436`

Algorithm	Hash digest
SHA256	`b7f642c8816a6de4bdbcd7213b3ea3d66b836c30375a079227922c5a4435d056`
MD5	`18ff1d16528c6bc90bf4b32336e9f797`
BLAKE2b-256	`49fe740f6b95a002fd3fd82179b3aa547dbfaf3d06090a570e3a274fe76badde`

Algorithm	Hash digest
SHA256	`b86ffe155bbc0b42586515310af7d35596a21ff2923e30b43fc803c37efb79a8`
MD5	`ef5a2cc2ef7b4277cc2a845528617432`
BLAKE2b-256	`5bfee95fc2d74f327700764d0301efe851697cee4f67143ff397d8e0c268a7b0`

Algorithm	Hash digest
SHA256	`c195866ba350483cd0d27a308149349d4101544d16a2fd0d31d2f621c2000103`
MD5	`fc2f08531669478c119c18f5155515ec`
BLAKE2b-256	`5a1fa0695fdb30a8e4961c163b069d0a9e90ab2971d402431fdefa5b17a06f6f`

Algorithm	Hash digest
SHA256	`d9ac3f1c63a0828166f8f8ba960d47e8086712f3fef55fe5df6becb7fe182acc`
MD5	`b2f6a44b153cf9525a19f6bce1d9dced`
BLAKE2b-256	`36458c62fd1eef9dc23db1ec3250fa49d3d8d31a21e730a0d9531f15e1de334e`