1. No category

PHP Package Management
with Composer
Clark Everetts, Zend Technologies, Inc.
COMMON 2015 Annual Meeting and Exposition
April 27 2015
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Confidential - © All rights reserved. Zend Technologies, Inc.
© All rights reserved. Zend Technologies, Inc.
Welcome!
Clark Everetts, ZCE
• Zend Technologies, Inc. – The PHP Company
• PHP since 2005
• Professional Services Consultant
– Architecture and Performance Audits
– PHP and Zend Framework Training
– Application Development, Best Practices, etc.
• clark.e@zend.com
+ClarkEverettsAtZend
@clarkphp
• Slides for this talk are at http://clarkeveretts.com/ and COMMON site
Make sure you have an
evaluation form.
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INTRODUCTION/BACKGROUND
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Why are we here? Our Agenda.
Composer:
•
•
•
•
•
What is it?
What problem does it solve?
What does it actually do?
How do I use it?
Do’s and Don’ts / Best Practices
Might use it just for
the cool logo …
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Composer is …
… a per-project PHP dependency manager
That’s all. Any questions?
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Composer is …
… a per-project PHP dependency manager
Let’s break it down.
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PHP Package Dependencies
… a per-project PHP dependency manager
• PHP project-related files only
• Can reference assets like Javascript, images, XML, CSS, etc.
• But not for managing Javascript or CSS libraries (more later)
• Primarily a development - not production – tool (“can” be prod*)
*but I’m not a fan
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What’s a “dependency”?
… a per-project PHP dependency manager
Your Project
“Project” == Application
DEPENDENCIES,
PACKAGES,
LIBRARIES
You wrote these to
reuse across apps.
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3rd-Party
ZF2, Laravel, OAuth2,
Symfony
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Dependencies can have dependencies
… a per-project PHP dependency manager
Your Project
“Project” == Application == Library == Package
“I need
A, B, C, D”
A
B
C
“I need E”
D
“I need E”
E
F
Composer obtains all
specified dependencies.
“I need G, H”
G
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DEPENDENCIES,
PACKAGES,
LIBRARIES
H
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Want to manage that yourself?
You’d need to:
•
•
•
•
•
•
•
Identify the direct dependencies of your project
Identify their dependencies, and all sub-dependencies
Locate the source code (PEAR, Git, Subversion, zip/gzip/bz2)
Download and install all of the source code
Make sure all the versions are compatible
Check for updates to any of the dependencies
Do it all again when updates are available
“I need these”
A
B
“I need
this”
C
“I need
that”
E
“I need the
other”
G
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D
H
F
With your guidance, Composer
does all this for you.
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Who is getting updated?
… a per-project PHP dependency manager
Our project code didn’t
change; so neither does
the version number.
1.0.0
2.4.0
3.2.1
2.4.1
Dependency updated with
non BC-breaking change.
time
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1.0.0
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3.2.1
Different versions of the same package
… a per-project PHP dependency manager
Application
A
Lib X
1.2.0
Two projects, each using a
different version of the same
dependency.
Lib Y
1.0.1
Composer is not a global
“package manager”
(PEAR, APT, YUM)
Application
B
Lib X
2.4.1
Why do this?
• Working with development version: Dev, Alpha, Beta, RC
• Update cycle for App A !== App B
Downside
• Potentially many copies of the exact same library code on disk.
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Lib Y
1.0.1
Composer is…
… a per-project PHP dependency manager
• Knows what packages your application or library depends upon
• Obtains those packages, and all of their dependencies, and
installs appropriate versions of them into your project
• When requested, checks for updates compatible with your
project, and downloads into it any updated packages
• Allows you to pin multiple applications/libraries to the same or
different versions of the packages they use.
Composer makes it easier to manage
application dependencies.
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COMPOSER.JSON &
COMPOSER.LOCK
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Now What?
We’ve answered some questions, and raised others:
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•
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•
•
How do we inform Composer what dependencies a project has?
Where does it put them in the project?
Where does Composer obtain dependencies?
How does the project refer to those dependencies?
How do we install Composer and actually use it?
A closer look…
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Describing Project Dependencies
composer.json file tells Composer about your project’s needs
{
"name" : "Composer-Intro",
"require" : {
"zendframework/zend-log" : ">=2.3.5"
},
"repositories" : [ {
"type" : "composer",
"url" : "https://packagist.org/"
}]
}
Composer-Intro
composer.json
zendframework/
zend-log
>=2.3.5
composer.json
Light text - Optional
Bold text - Required
Note: >=2.3.5 is an Unbound Version Constraint
Eventual BC breaks likely; for illustration only!!
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?
?
?
Installing Project Dependencies – First Level/Direct
composer install
Before
After
Composer-Intro
zendframework/
zend-log
>=2.3.5
{
"require" : {
"zendframework/zend-log" : ">=2.3.5"
}
}
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New:
•Vendor Directory
•composer.lock file
Installing Project Dependencies – Further Levels
zend-log composer.json file contains this:
{…
"require": {
"php": ">=5.3.23",
"zendframework/zend-servicemanager": "self.version",
"zendframework/zend-stdlib": "self.version"
},
…
zend-log needs two more packages,
}
use same version of those as zend-log
zend-servicemanager and zend-stdlib composer.json files each contain this:
{…
"require": {
No further code dependencies,
"php": ">=5.3.23",
},
Note PHP version requirement.
…
}
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Where dependencies are stored (by default)
Dependency Relationship
Directory Structure
Composer-Intro
Composer-Intro
zend-log
vendor
zend-log
zend-servicemanager
zend-servicemanager
zend-stdlib
zend-stdlib
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“Design-To” vs. “As-Built”
composer.json tells Composer what you want
Composer-Intro
Composer-Intro
zend-log
2.4.0
zendframework/
zend-log
>=2.3
zend-servicemanager
2.4.0
zend-stdlib
2.4.0
composer.lock tells you what you got
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“Design-To” vs. “As-Built” – Further Example
Composer resolves versions as best it can
Composer-Intro
Composer-Intro
zend-log
2.3.7
zendframework/
zend-log
>=2.3,<2.4
zend-servicemanager
2.3.7
zend-stdlib
2.3.7
actual versions installed recorded in composer.lock
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Problems Can Occur
Your Project
A
B
“I need E >=1.0,<1.2”
C
“I need E >=1.2,<2.0”
E version ?
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Flow for new composer install
With no composer.lock
Composer will …
composer.json
vendor
folder
4. Create
Your Application
composer.lock
Repository
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Flow for subsequent composer install
With existing
composer.lock
Composer will …
composer.json
vendor
folder
4. Update
1. Read
composer.lock
Your Application
2. Obtain lock file versions from
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Repository
Flow for any composer update
With existing
composer.lock
Composer will …
composer.json
vendor
folder
4. Update
1. Read
composer.lock
Your Application
2. Obtain packages’ latest compatible
release from
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Repository
Development Considerations
install === synchronize
Development
Workstation /
Vhost
Development
Workstation /
Vhost
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Development
Workstation /
Vhost
composer update &
commit to local VCS
composer install
composer install
Packagist.org
Development
Workstation /
Vhost
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composer install
Production Considerations
Production
Server
composer install
composer update
You should be fired.
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Packagist.org
Production Considerations
composer install
with composer.lock file
“Build”
Server
Packagist.org
Better.
Production
Server
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Production Considerations
Local
Repository (VCS /
Change Mgt,
Packagist)
Test
Server
Or
Production
Server
Production
Server
Best.
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Building Deployment Fileset
Use lock file
Don’t install
development requirements
composer install - - prefer-dist - - no-dev - - optimize-autoloader
Download Distribution
Packages
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Generate PSR-0/4 classmap
for fast autoloading
MORE ON PACKAGES &
REPOSITORIES
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Where Does Composer Obtain Dependencies?
Composer downloads packages from repositories
Package
• A directory with files in it
• Package description - composer.json
• Name
• Version
• Source Definition
• Repository location (URI)
• Repository Type
• Package Type
• Dist – packaged (usually a stable release)
• Source – source code (for development)
• Can be both
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More About Packages - Naming
Package Names
• vendor-name/project-name
• psr/log
• pear/log
• zendframework/log
• Best practice: use-dashes/as-word-separators
• Vendor names must be unique
• If you are going to publish packages:
• Remember they persist!
• Don’t be cute or cryptic (with vendor or package name)
• Name should reflect package purpose
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Packages - composer.json – Real Example
{
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"name": "zendframework/zend-log",
"description": "component for general purpose logging",
"license": "BSD-3-Clause",
"keywords": ["zf2“, "log“, "logging”],
"homepage": "https://github.com/zendframework/zf2",
"autoload": {
"psr-4": {
"Zend\\Log\\": ""
}
},
"require": {
"php": ">=5.3.23",
"zendframework/zend-servicemanager": "self.version",
"zendframework/zend-stdlib": "self.version"
}, (cont. next slide)
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Packages - composer.json – Real Example (cont.)
"require-dev": {
"zendframework/zend-console": "self.version",
"zendframework/zend-db": "self.version",
"zendframework/zend-escaper": "self.version",
"zendframework/zend-mail": "self.version",
"zendframework/zend-validator": "self.version"
},
"suggest": {
"ext-mongo": "*",
"zendframework/zend-console": "Zend\\Console component",
"zendframework/zend-db": "Zend\\Db component",
"zendframework/zend-escaper": "Zend\\Escaper component, for use in the
XML formatter",
"zendframework/zend-mail": "Zend\\Mail component",
"zendframework/zend-validator": "Zend\\Validator component"
}, (cont. next slide)
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Packages - composer.json – Real Example (cont.)
"extra": {
"branch-alias": {
"dev-master": "2.3-dev",
"dev-develop": "2.4-dev"
}
}
Notice anything missing?
}
• package type – omit, “library”, or custom
• package version
• Best to omit for Composer, VCS repositories (uses branch/tags)
• Format: X.Y.Z or vX.Y.Z, with optional RC, beta, alpha, patch
• 1.4.26
• 2.5.6-RC3
• 1.2.3-p2
• 1.2.3-RC
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Platform / Virtual Packages
Not Installable by Composer, Used for checking only
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•
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php – PHP version of the server Composer is installing packages to
hhvm (not applicable for IBM i)
ext-<name>
• “ext-ibm_db2” : “*”
lib-<name>
• curl
• iconv
• icu
• libxml
• openssl
• pcre
• uuid
• xsl
composer show --platform for a list of available platform packages
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More About Repositories
Repository
• A download source for packages, specified by URL
• A list of packages and versions in a packages.json file
• Types
• Composer – uses Packagist software, can public or private
• VCS – Git, SVN, Hg
• VCS client needed for “regular” git, svn, or hg repos
• Uses APIs for GitHub, BitBucket (no client needed)
• PEAR – public or private
• Package – zip; use only if none of the above are possible
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Repositories: Packagist.org
Packagist.org
Package Archivist
Just a Composer Repository…
• … but it is the primary repository for open source packages
• Open Source Project Best Practice: register it at packagist.org
• Searchable / Browseable
• Less work for people to find and use your package.
• Many, many, many packages available. Duplication.
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https://packagist.org/
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Private Repositories – Satis and Torin Proxy
Torin / Satis
Your Application
Proxy
Packagist.org
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Satis – free
TorinProxy.com – license
fees support development
of Composer
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Public
Repositories
Private Repositories – Local Packagist
Your Application
composer.json /
composer.lock
Private
Repository
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SEMANTIC VERSIONING
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Semantic Versioning http://semver.org/
Version Numbers Have Meaning
Essentially, it is a promise from the development team
Not a guarantee, but a best effort
1.2.3 – numbers increment, can have pre-release suffix
Major.Minor.Patch
Patch: bug fixes; no BC breaks!; everyone using the package
should be confident in moving from 1.2.3 to 1.2.4
• Minor: introduce new features, but change no APIs; no BC breaks!
Changing internals should not affects package users. everyone
using the package should be confident in moving from 1.2.3 to
1.3.0.
• Major: API changes; BC breaks (whether intentional or not).
Example: 1.3.14 to 2.0.0
• For developers, not marketing department.
•
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•
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Semantic Versioning
Shortcut notations in Composer for version specifications
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“Next Significant Release”
^1.2.3 means 1.2.3 <= x < 2.0.0
>=1.2.3,<2.0.0
Specifies a min version; last number specified can increment
Next Significant Release
~1.2.3 means 1.2.0 <= x < 1.3.0
>=1.2,<1.3.0
Specifies a min version; last number specified can increment;
assured none breaking changes will be accepted
© All rights reserved. Zend Technologies, Inc.
Best Practices
Do’s and Don’ts:
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•
Unbound Version Constraints
Version Constraints combined with Wildcards
Wildcards by themselves
Install or update to the intended directory
Be careful out there!
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Best Practices / Do’s and Don’ts
Do NOT use unbound version constraints (>=, no upper bound):
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Example: >=2.3
Example: >=1.1.* (note that * is not the problem here, >= is)
Example: dev-master
Composer will install new updates, as long as they become available,
without regard to backwards-compatibility. (You’ll get 2.3.5, 10.5.23, etc.)
Solution: >=2.3,<3.0 or ~2.3
Solution: >=1.1.0,<1.2 or ~1.1.0
Best Practice: Use ^2.3 or >=2.3
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Best Practices / Do’s and Don’ts
Do NOT attempt to specify a version constraint with a wildcard:
•
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Example: >=2.*
Example: >=1.1.*
>=2 means any version at least 2.0.0 (2.0.5, or 2.9.9, or 3.0.7, 10.3.2, etc.)
2.* means any version in the interval [2.0.0, 3.0.0), or 2.0.0-2.9.9999
Composer can’t tell if you want 3.0.0 to be considered, or not.
Composer: “Invalid, I’m throwing an error”
Solution: use >=2,<3 or >=2,<=3
Best Practice: ^2 (for semantic versioning)
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Best Practices / Do’s and Don’ts
Do NOT use a wildcard, except for virtual extension packages:
• Example: 1.2.* is bad – slows composer down
• Looks at all patch level releases, and all their sub-dependencies
• Also limits composer to versions < 1.3 forever
Composer: “Don’t make me work so hard!”
Solution: use ~1.2.0 or >=1.2.0,<2.0.0
SemVer Best Practice: ^1
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Best Practices / Do’s and Don’ts
Make SURE you’re in right folder when issuing composer install
• Will read composer.json in that folder, create vendor folder, and .lock file
• Regardless of existence of .lock file in project root directory
• Same for composer update!
– Part of your vendor folder could be updated with packages not
compatible with other packages
Run composer install /update from root of
your project.
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Resources
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Composer Manual - https://getcomposer.org/doc/
Semantic Versioning - http://semver.org/
JSON (JavaScript Object Notation) - http://json.org/
Help - https://groups.google.com/forum/#!forum/composer-users
IRC - #composer on freenode irc://irc.freenode.org/composer
Packagist Semver Checker – http://semver.mwl.be/
Composer.json Schema
https://getcomposer.org/doc/04-schema.md
https://github.com/composer/composer/blob/master/res/composerschema.json
http://stackoverflow.com/questions/tagged/composer-php
Zend Webinars - http://www.zend.com/en/resources/webinars
http://www.zend.com/en/resources/news-and-events/newsroom
Latest Updates / Slides for this talk – http://clarkeveretts.com/
© All rights reserved. Zend Technologies, Inc.
THANK-YOU
clark.e@zend.com
+ClarkEverettsAtZend
@clarkphp
Slides for this talk are at http://clarkeveretts.com/ and COMMON site
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