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Contributing to the PHP Driver for MongoDB

Building from Source

Developers who would like to contribute to the driver will need to build it from source. The repository may be initialized with:

$ git clone https://github.com/mongodb/mongo-php-driver.git
$ cd mongo-php-driver
$ git submodule update --init

The following script may be used to build the driver:

#!/bin/sh

phpize > /dev/null && \
./configure --enable-mongodb-developer-flags > /dev/null && \
make clean > /dev/null && make all > /dev/null && make install

To verify that the installation was successful, run the following command, which will report phpinfo() output for the extension:

$ php --ri mongodb

Generating arginfo from stub files

Arginfo structures are generated from stub files using the gen_stub.php file. Note that this requires phpize to be run for PHP 8.2 to make use of all features. After changing a stub file, run ./build/gen_stub.php to regenerate the corresponding arginfo files and commit the results.

Generating function maps for static analysis tools

PHPStan and Psalm use function maps to provide users with correct type analysis when using this extension. To generate the function map, run the generate-function-map make target. The generated map will be stored in scripts/functionMap.php.

Testing

The extension's test use the PHPT format from PHP internals. This format is documented in the following links:

Generally, most tests will be based on the following template:

--TEST--
Description of API or JIRA issue being tested
--SKIPIF--
<?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
<?php /* One or more skip functions */ ?>
--FILE--
<?php
require_once __DIR__ . "/../utils/basic.inc";

// Test code

?>
===DONE===
<?php exit(0); ?>
--EXPECT--
===DONE===

The basic-skipif.inc and basic.inc files contain utility functions for the SKIPIF and FILE sections, respectively. If those functions are not needed (e.g. skip logic only depends on checking the PHP_INT_SIZE constant), the test should not include the file. When it doubt, keep it simple.

Best Practices for SKIPIF

The skipif.php file defines various helper functions for use within a test's SKIPIF section. When multiple functions are used in a single SKIPIF section, they should be logically ordered:

  • Any PHP environment requirements should be checked first. For example, if a test requires a 64-bit architecture, start by checking PHP_INT_SIZE before anything else.
  • Any extension build requirements (e.g. skip_if_not_libmongoc_crypto()) or test environment requirements (e.g. skip_if_auth()) should then be checked. These functions only examine local information, such as phpinfo() output or the structure of the URI constant, and do not interact with a remote MongoDB server.
  • Any remote server requirements should then be checked. A general integration test that requires any type of remote server to be accessible might use skip_if_not_live() while a test requiring a replica set would prefer skip_if_not_replica_set().
  • After requiring a remote server to be accessible (optionally with a specific type), you can enforce requirements about that server. This includes checking its server version, storage engine, availability of test commands, etc.
  • Finally, use skip_if_not_clean() if needed to ensure that the collection(s) under test are dropped before the test runs.

As a rule of thumb, your SKIPIF logic should be written to allow the test to run in as many environments as possible. To paraphrase the robustness principal:

Be conservative in what/how you test, and liberal in what environment you require

Consider that a well-crafted EXPECTF section may allow a SKIPIF section to be less restrictive.

Environment Variables

The test suite references the following environment variables:

  • MONGODB_DATABASE: Default database to use in tests. Defaults to phongo.
  • MONGO_ORCHESTRATION_URI: API endpoint for Mongo Orchestration. Defaults to http://localhost:8889/v1. This is only used by a few tests that start temporary servers, and those tests will be skipped if Mongo Orchestration is inaccessible.
  • MONGODB_URI: Connection string. Defaults to mongodb://127.0.0.1/, which assumes a MongoDB server is listening on localhost port 27017.
  • SSL_DIR: Path to directory containing certificate files. On Evergreen, this will be set to the .evergreen/x509gen directory within drivers-evergreen-tools. If undefined or inaccessible, tests requiring certificates will be skipped.

The following environment variable is used for stable API testing:

The following environment variables are used for CSFLE testing:

  • CRYPT_SHARED_LIB_PATH: If defined, this value will be used to set the cryptSharedLibPath autoEncryption driver option for MongoDB\Driver\Manager objects created by the test suite.

Mongo Orchestration

Mongo Orchestration is an HTTP server that provides a REST API for managing MongoDB servers and clusters. Evergreen CI and GitHub Actions use configurations provided by the drivers-evergreen-tools repository. These configurations are loaded by Mongo Orchestration, which then provides a connection string to assign to MONGODB_URI and run the test suite. Additionally, some tests start temporary servers and interact directly with Mongo Orchestration (via MONGO_ORCHESTRATION_URI).

For local development, running Mongo Orchestration is not required and it is generally sufficient to test against a single-node replica set.

Updating libmongoc, libbson, and libmongocrypt

The PHP driver can use either system libraries or bundled versions of libmongoc, libbson, and libmongocrypt. If a new version of either library is available, the submodule and build configuration will need to be updated to reflect the new sources and/or package version.

Resolving Submodule Conflicts When Merging Maintenance Branches

When merging a maintenance branch up to master, it is quite possible for there to be a submodule conflict (and in related files). Resolving a merge conflict should never result in downgrading a submodule to an older version. Rather, the submodule should be conservatively advanced and satisfy any requirements for incoming changes from the maintenance branch.

For example, the 1.14.2 release bumped libmongoc from 1.22.1 to 1.22.2. When merging v1.14 into master (1.15-dev), a conflict arose because the libmongoc submodule in master pointed to a 1.23-dev commit (before the 1.23.0 release). In this case, there were no particular requirements for incoming changes from the v1.14 branch and the libmongoc submodule was bumped to 1.23.0 even though a 1.23.1 tag also existed at the time. The bump to libmongoc 1.23.1 was left to another PHPC ticket in the 1.15.0 milestone, which actually depended on the libmongoc changes therein.

Updating bundled libraries

The following steps are the same for libmongoc and libmongocrypt. When updating libmongocrypt, follow the same steps but replace libmongoc with libmongocrypt, retaining the same capitalization. The following examples always refer to libmongoc.

Update submodule

cd src/libmongoc
git fetch
git checkout 1.20.0

During development, it may be necessary to temporarily point the submodule to a commit on the developer's fork. For instance, the developer may be working on a PHP driver feature that depends on unmerged or unreleased changes. In this case, the submodule path can be updated using the git submodules set-url command can be used to change the URL, and git submodules set-branch can be used to point the submodule to a development branch:

git submodules set-url src/libmongoc https://github.com/<owner>/<repo>.git
git submodules set-branch -b <branch> src/libmongoc

Ensure version information is correct

Various build processes and tools rely on the version files to infer version information. This file can be regenerated using Makefile targets:

make libmongoc-version-current

Alternatively, the build/calc_release_version.py script in the submodule can be executed directly.

Note: If the submodule points to a non-release, non-master branch, the script may fail to correctly detect the version. This issue is being tracked in CDRIVER-3315 and can be safely ignored since this should only happen during development (any PHP driver release should point to a tagged submodule version).

Update sources in build configurations

The Autotools and Windows build configurations (config.m4 and config.w32, respectively) define several variables (e.g. PHP_MONGODB_MONGOC_SOURCES) that collectively enumerate all of the sources within the submodules to include in a bundled build.

These variables should each have a shell command in a preceding comment, which should be run to regenerate that particular list of source files. Each command may be run manually or scripts/update-submodule-sources.php may be used to update all variables. In the event that a new source directory is introduced, this directory will need to be manually added following prior art.

Update package dependencies

The Autotools configuration additionally includes some pkg-config commands for using libmongoc, libbson, and libmongocrypt as system libraries (in lieu of a bundled build). When bumping the bundled version, be sure to update the version check and error message in the pkg-config blocks for the submodule being updated. When updating libmongoc, be sure to update both version checks for libmongoc and libbson.

For example, the following lines might be updated for libmongoc:

if $PKG_CONFIG libmongoc-1.0 --atleast-version 1.20.0; then

...

AC_MSG_ERROR(system libmongoc must be upgraded to version >= 1.20.0)

Update tested versions in Evergreen configuration (libmongoc only)

Evergreen tests against multiple versions of libmongoc. When updating to a newer libmongoc version, make sure to update the libmongoc build tasks in .evergreen/config/templates/build/build-libmongoc.yml and regenerate the build configuration. The template file contains additional information about the build tasks and where they are used. In general, we test against two additional versions of libmongoc:

  • The upcoming patch release of the current libmongoc minor version (e.g. the r1.x branch)
  • The upcoming minor release of libmongoc (e.g. the master branch)

Update sources in PECL package generation script

If a new version of a submodule introduces a new source directory, that may also require updating the glob patterns in the bin/prep-release.php script to ensure new source files will be included in any generated PECL package.

Update SBOM file

After updating dependencies, the SBOM file needs to be updated. There is a script to automate this process:

./scripts/update-sbom.sh

This script will generate a temporary purl file with our dependencies, then run the internal silkbomb tool to update the SBOM. Note that you need to have docker installed in order to run this.

Test and commit your changes

Verify that the upgrade was successful by ensuring that the driver can compile using both the bundled sources and system libraries, and by ensuring that the test suite passes. Once done, commit the changes to all of the above files/paths. For example:

git commit -m "Bump libmongoc to 1.20.0" config.m4 config.w32 src/libmongoc src/LIBMONGOC_VERSION_CURRENT sbom.json