README.md

protolock

Track your .proto files and prevent changes to messages and services which impact API compatibilty.

Why

Ever accidentally break your API compatibility while you're busy fixing problems? You may have forgotten to reserve the field number of a message or you re-ordered fields after removing a property. Maybe a new team member was not familiar with the backward-compatibility of Protocol Buffers and made an easy mistake.

protolock attempts to help prevent this from happening.

Install

If you have Go installed, you can install protolock by running:

go get -u github.com/nilslice/protolock/...

Otherwise, download a pre-built binary for Windows, macOS, or Linux from the latest release page.

Usage

protolock <command> [options]

Commands:
	-h, --help, help	display the usage information for protolock
	init			initialize a proto.lock file from current tree
	status			check for breaking changes and report conflicts
	commit			overwrite proto.lock file with current tree

Options:
	--strict [true]		enable strict mode and enforce all built-in rules
	--debug	[false]		enable debug mode and output debug messages

Overview

1. Initialize your repository:

    $ protolock init
    # creates a `proto.lock` file
   

2. Add changes to .proto messages or services, verify no breaking changes made:

    $ protolock status
    CONFLICT: "Channel" is missing ID: 108, which had been reserved [path/to/file.proto]
    CONFLICT: "Channel" is missing ID: 109, which had been reserved [path/to/file.proto]
   

3. Commit a new state of your .protos (overwrites proto.lock):

    $ protolock commit
   

4. Integrate into your protobuf compilation step:

    $ protolock status && protoc -I ...
   

In all, prevent yourself from compiling your protobufs and generating code if breaking changes have been made.

Recommended: commit the output proto.lock file into your version control system

Rules Enforced

No Using Reserved Fields

Compares the current vs. updated Protolock definitions and will return a list of warnings if any message's previously reserved fields or IDs are now being used as part of the same message.

No Removing Reserved Fields

Compares the current vs. updated Protolock definitions and will return a list of warnings if any reserved field has been removed.

Note: This rule is only enforced when strict mode is enabled.

No Changing Field IDs

Compares the current vs. updated Protolock definitions and will return a list of warnings if any field ID number has been changed.

No Changing Field Types

Compares the current vs. updated Protolock definitions and will return a list of warnings if any field type has been changed.

No Changing Field Names

Compares the current vs. updated Protolock definitions and will return a list of warnings if any message's previous fields have been renamed.

Note: This rule is only enforced when strict mode is enabled.

No Removing Fields Without Reserve

Compares the current vs. updated Protolock definitions and will return a list of warnings if any field has been removed without a corresponding reservation of that field name or ID.

No Removing RPCs

Compares the current vs. updated Protolock definitions and will return a list of warnings if any RPCs provided by a Service have been removed.

Note: This rule is only enforced when strict mode is enabled.

No Changing RPC Signature

Compares the current vs. updated Protolock definitions and will return a list of warnings if any RPC signature has been changed while using the same name.

Contributing

Please feel free to make pull requests with better support for various rules, optimized code and overall tests. Filing an issue when you encounter a bug or any unexpected behavior is very much appreciated.

For current issues, see: open issues

Acknowledgement

Thank you to Ernest Micklei for his work on the excellent parser heavily relied upon by this tool and many more: https://github.com/emicklei/proto