A new way of working with Protocol Buffers.

Overview

Buf

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All documentation is hosted at https://buf.build. Please head over there for more details.

Goal


Buf’s long-term goal is to enable schema-driven development: a future where APIs are defined consistently, in a way that service owners and clients can depend on.

Defining APIs using an IDL provides a number of benefits over simply exposing JSON/REST services, and today, Protobuf is the most stable, widely-adopted IDL in the industry.

However, as it stands, using Protobuf is much more difficult than using JSON as your data transfer format.

Enter Buf: We’re building tooling to make Protobuf reliable and easy to use for service owners and clients, while keeping it the obvious choice on the technical merits.

Your organization should not have to reinvent the wheel to create, maintain, and consume Protobuf APIs efficiently and effectively. We'll handle your Protobuf management strategy for you, so you can focus on what matters.

We’re working quickly to build a modern Protobuf ecosystem. Our first tool is the Buf CLI, built to help you create consistent Protobuf APIs that preserve compatibility and comply with design best-practices. The tool is currently available on an open-source basis.

Our second tool, the Buf Schema Registry (“BSR”), will be the hub of our ecosystem. The BSR is a platform that serves as the source of truth for your organization's Protobuf files, enabling you to centrally maintain compatibility and manage dependencies, while enabling your clients to consume APIs reliably and efficiently. The BSR will be available for a limited, free private beta shortly.

Quick Links

However, we recommend you read the below introduction first!

The problems we aim to solve

Traditionally, adopting Protobuf presents a number of challenges across the API lifecycle. These are the problems we aim to solve.

Creating consistent Protobuf APIs

  • API designs are often inconsistent: Writing maintainable, consistent Protobuf APIs isn't as widely understood as writing maintainable JSON/REST-based APIs. With no standards enforcement, inconsistency can arise across an organization's Protobuf APIs, and design decisions can inadvertantly affect your API's future iterability.

Maintaining compatible, accessible Protobuf APIs

  • Dependency management is usually an afterthought: Protobuf files are vendored manually, with an error-prone copy-and-paste process from Github repositories. There is no centralized attempt to track and manage around cross-file dependencies.

  • Forwards and backwards compatibility is not enforced: While forwards and backwards compatibility is a promise of Protobuf, actually maintaining backwards-compatible Protobuf APIs isn't widely practiced, and is hard to enforce.

Consuming Protobuf APIs efficiently and reliably

  • Stub distribution is a difficult, unsolved process: Organizations have to choose to either centralize the protoc workflow and distribute generated code, or require all service clients to run protoc independently. Because there is a steep learning curve to using protoc and associated plugins in a reliable manner, organizations end up choosing to struggle with distribution of Protobuf files and stubs. This creates substantial overhead, and often requires a dedicated team to manage the process. Even when using a build system like Bazel, exposing APIs to external customers remains problematic.

  • The tooling ecosystem is limited: Lots of easy-to-use tooling exists today for JSON/REST APIs. Mock server generation, fuzz testing, documentation, and other daily API concerns are not widely standardized and easy to use for Protobuf APIs, requiring teams to regularly reinvent the wheel and build custom tooling to replicate the JSON ecosystem.

Buf is building a modern Protobuf ecosystem

Our tools will address many of the problems above, ultimately allowing you to redirect much of your time and energy from managing Protobuf files to implementing your core features and infrastructure.

The Buf CLI

The Buf CLI incorporates the following components to help you create consistent Protobuf APIs:

The Buf CLI is designed to be extremely simple to use, while providing functionality for advanced use cases. Features of the CLI include:

  • Automatic file discovery: By default, Buf will build your .proto files by walking your file tree and building them per your build configuration. This means you no longer need to manually specify your --proto_paths and files every time you run the tool. However, Buf does allow manual file specification through command-line flags if you want no file discovery to occur, for example in Bazel setups.

  • Selectable configuration: of the exact lint and breaking change configuration you want. While we recommend using the defaults, Buf allows you to easily understand and select the exact set of lint and breaking change rules your organization needs.

    Buf provides 40 available lint rules and 54 available breaking rules to cover most needs. We believe our breaking change detection truly covers every scenario for your APIs.

  • Selectable error output: By default, Buf outputs file:line:col:message information for every lint error and every breaking change, with the file path carefully outputted to match the input location, including if absolute paths are used, and for breaking change detection, including if types move across files. JSON output that includes the end line and end column of the lint error is also available, and JUnit output is coming soon.

  • Editor integration: The default error output is easily parseable by any editor, making the feedback loop for issues very short. Currently, we only provide Vim and Visual Studio Code integration for linting but will extend this in the future to include other editors such as Emacs and Intellij IDEs.

  • Check anything from anywhere: Buf allows you to not only check a Protobuf schema stored locally as .proto files, but allows you to check many different Inputs:

    • Tar or zip archives containing .proto files, both local and remote.
    • Git repository branches or tags containing .proto files, both local and remote.
    • Pre-built Images or FileDescriptorSets from protoc, from both local and remote (http/https) locations.
  • Speed: Buf's internal Protobuf compiler utilizes all available cores to compile your Protobuf schema, while still maintaining deterministic output. Additionally files are copied into memory before processing. As an unscientific example, Buf can compile all 2,311 .proto files in googleapis in about 0.8s on a four-core machine, as opposed to about 4.3s for protoc on the same machine. While both are very fast, this allows for instantaneous feedback, which is especially useful with editor integration. Buf's speed is directly proportional to the input size, so checking a single file only takes a few milliseconds.

The Buf Schema Registry

The Buf Schema Registry will be a powerful hosted SaaS platform to serve as your organization’s source of truth for your Protobuf APIs, built around the primitive of Protobuf Modules. We’re introducing the concept of Protobuf Modules to enable the BSR to manage a group of Protobuf files together, similar to a Go Module.

Initially, the BSR will offer the following key features:

  • Centrally managed dependencies: Resolve diamond dependency issues caused by haphazard versioning, even with external repository dependants.

  • Automatically enforce forwards and backwards compatibility: Ensure API clients never break, without wasteful team-to-team communication or custom SLAs.

  • Generated libraries produced by a managed compiler: Language-specific stub generation using Buf’s high-performance, drop-in protoc replacement.

Over time, our goal is to make the BSR the only tool you need to manage your Protobuf workflow from end to end. To that end, there's a lot we are planning with the Buf Schema Registry. For a quick overview, see our roadmap.

Where to go from here

To install Buf, proceed to installation. This includes links to an example repository for Travis CI and GitHub Actions integration.

Next, we recommend completing the tour. This tour should only take about 10 minutes, and will give you an overview of most of the existing functionality of Buf.

After completing the tour, check out the remainder of the docs for your specific areas of interest. We've aimed to provide as much documentation as we can for the various components of Buf to give you a full understanding of Buf's surface area.

Finally, follow the project on GitHub, and contact us if you'd like to get involved.

Issues
  • Add functionality to convert Image formats

    Add functionality to convert Image formats

    I am dealing with a set of proto files from a couple legacy repos that I cannot change. I can successfully build an image from these protos, but I cannot generate stubs from them with protoc. To generate stubs correctly I would have to write some nasty commands to automatically fixup the proto files before building the image. However, if I could build a JSON image, modify that really easily with jq, and then convert that to a binary image with buf to use as input to protoc, I wouldn't have to resort to hack-ily sed-ing the proto files. Is this possible?

    P.S. Converting binary images to JSON would also be useful for introspection, but that is not necessary for me right now.

    Feature 
    opened by andremarianiello 27
  • Add configuration option to enable inline comment-driven ignores

    Add configuration option to enable inline comment-driven ignores

    Documentation says

    Note that buf does not allow comment-driven ignores.

    While I understand the reasoning, I still suggest reconsidering. For example I just finished integrating buf checks in a code base which is a large monorepo. Most protos conform to almost all checks, but for most checks there's a few proto files that don't. Of course I could fix everything (actually sometimes that's impossible, but okay), but that would involve a ton of work. The yaml solution is far from perfect as every time the config changes the whole repository needs to be re-linted rather than just one proto file that has changed. Not to mention a huge config with all the checks and files needs to be created and maintained. I would prefer to silence those places and create issues for maintainers to fix whatever is possible at their own pace. Instead I have to only enable a couple of very basic checks for the whole repo. Which means most of new bad code will not be rejected, so while existing issues are being fixed new ones will pop up.

    As you can see, while principled, the no-comments approach is far from practical as it makes it impossible to implement buf check in a large repository in a meaningful way.

    Feature 
    opened by Monnoroch 26
  • Evaluate adding symlink support

    Evaluate adding symlink support

    Hi, another question for you.

    Is it possible to have buf follow symlinks? The way the build folder is setup with bazel (by default) means the original repo is symlinked. We need to use the build folder as bazel pulls in all the external proto files we need to compile with.

    Thanks, Adam

    Feature P3 
    opened by AdamSvetec 26
  • Error while

    Error while "buf generate"

    buf: downloading buf.build/beta/googleapis:aced890b7e944f9ca174481ad810ca5f

    opened by abhi021 23
  • Disable linting for certain directories

    Disable linting for certain directories

    No matter what I do, buf check lint checks all directories. I can't get it to actually ignore lint errors from a particular directory.

    Is there a way to make this work?

    Thank you!

    opened by gitpushdashf 22
  • Breaking change detector does not ignore deleting files

    Breaking change detector does not ignore deleting files

    Is this expected? If so, what is the recommended way to delete a service?

    Config:

    build:
        roots:
            - proto/
    lint:
        use:
            - DEFAULT
            - FILE_LOWER_SNAKE_CASE
    breaking:
        use:
            - FILE
        ignore:
            - company/proto/iam/v1test
    

    Steps:

    • Delete: company/proto/iam/v1test.
    • Run: buf check breaking --against-input .git#branch=master

    Result:

    :1:1:Previously present file "company/proto/iam/v1test/service.proto" was deleted.

    Expected:

    Breaking change detector to pass.

    Feature P3 
    opened by r-kells 22
  • Buf compiled with protobuf v1.4.0 drops Custom Options

    Buf compiled with protobuf v1.4.0 drops Custom Options

    mkdir foo
    cd foo
    go mod init foo.bar
    go get google.golang.org/protobuf/proto
    go get github.com/bufbuild/buf/cmd/buf
    

    The binary installed will drop any custom options defined in your proto files when generating the Image file.

    Bug 
    opened by robsonmeemo 22
  • Add support for arbitrary git ref in check breaking

    Add support for arbitrary git ref in check breaking

    The buf check breaking command has support for branches and tags when checking against a git repository input. I want it to accept an arbitrary git reference, like refs/remotes/origin/master or refs/pull/3/head.

    In my humble opinion, if you're not afraid of breaking backwards compatibility, it makes sense to remove branch and tag flags, since they're just a strict subset of providing the reference directly (and removing them would simplify some of the flag logic).

    Feature 
    opened by fsommar 17
  • Linter not respecting ignore paths

    Linter not respecting ignore paths

    Hey My buf.yaml is configured like this:

    lint:
      use:
        - DEFAULT
        - COMMENT_ENUM
        - COMMENT_MESSAGE
        - COMMENT_RPC
        - COMMENT_SERVICE
        - PACKAGE_SAME_GO_PACKAGE
      except:
        - PACKAGE_DIRECTORY_MATCH
        - ONEOF_LOWER_SNAKE_CASE
        - PACKAGE_LOWER_SNAKE_CASE
      enum_zero_value_suffix: _INVALID
      ignore:
        - ./protoc-gen-gotag
        - ./protoc-gen-swagger
        - ./google
        - ./github.com/mwitkow
    

    However I still get errors as such running buf check lint:

    google/protobuf/unittest_custom_options.proto:108:12:*descriptorpb.OneofDescriptorProto protobuf_unittest.TestMessageWithCustomOptions.AnOneof: option (oneof_opt1): unrecognized extension oneof_opt1 of google.protobuf.OneofOptions
    google/protobuf/unittest_custom_options.proto:301:44:message protobuf_unittest.VariousComplexOptions: option (protobuf_unittest.complex_opt3).complexoptiontype5.plugh: cannot set field plugh because complexoptiontype5 is not a message
    google/protobuf/unittest_custom_options.proto:302:24:message protobuf_unittest.VariousComplexOptions: option (protobuf_unittest.complexopt6).xyzzy: cannot set field xyzzy because .protobuf_unittest.complexopt6 is not a message
    

    Am I doing anything wrong? I thought everything under google should be ignored.

    Thanks

    Working as intended 
    opened by kostyay 14
  • Skip BC checking for packages with 'beta' or 'alpha' in name

    Skip BC checking for packages with 'beta' or 'alpha' in name

    Hey Is it possible to disable BC checking for packages that are named as v1beta1.. since its ok for those APIs to make breaking changes.

    Thanks

    Feature 
    opened by kostyay 11
  • Buf cannot run breaking changes detection against remote branches

    Buf cannot run breaking changes detection against remote branches

    Running buf breaking --against .git#branch=origin/main is failing with the following error

    warning: Could not find remote branch origin/main to clone.
    fatal: Remote branch origin/main not found in upstream origin
    

    Running buf breaking --against .git#fef=origin/main is failing with the following error

    Failure: could not clone file:///Users/myyser/myrepo/.git: exit status 1
    error: pathspec 'origin/main' did not match any file(s) known to git
    
    

    Trying to walkaround this issue and running git rev-parse origin/main and then buf breaking --against .git#ref={git_sha} also sometimes cause the following error:

    Failure: could not clone file:///home/myuser/dev/myrepo/.git: exit status 128
    fatal: reference is not a tree: {git_sha}
    unlinkat /tmp/{git_sha}: directory not empty.                                                                                                                                                                                         
    

    buf.yaml config for breaking changes detection is standard. The root is the entire repo (default behavior) with some ignores, and the breaking rules are the default.

    Running breaking changes detection against origin/main making a lot of sense instead of running against maybe old local main. This is true especially in CI, where you do not have local main branch when running on a feature branch before merging.

    opened by menishmueli 1
  • multiple `buf beta mod export` with the same target directory overwrite the buf.lock

    multiple `buf beta mod export` with the same target directory overwrite the buf.lock

    Context

    In my case I am working on a Java gRPC client library.

    For now, I'm not trying to get buf to generate the protos as it's non-trivial to get the protoc-gen-grpc-java specified in the build system (Gradle in this case) to be referenceable by buf. Instead, I'm using buf beta mod export to just checkout the specific version of my protos and their dependencies into the directory that Gradle expects protos to be in.

    Repro

    Two calls to buf beta mod export with the same target directory will overwrite the buf.lock.

    $ buf beta mod export buf.build/authzed/api -o .
    $ cat buf.lock
           │ File: buf.lock
       1   │ # Generated by buf. DO NOT EDIT.
       2   │ deps:
       3   │   - remote: buf.build
       4   │     owner: beta
       5   │     repository: googleapis
       6   │     branch: main
       7   │     commit: 2e73676eef8642dfba4ed782b7c8d6fe
       8   │     digest: b1-vB11w98W2vFtEP4Veknm56Pi6DU6MpOuocESiOzvbqw=
       9   │     create_time: 2021-04-26T14:55:30.644663Z
      10   │   - remote: buf.build
      11   │     owner: beta
      12   │     repository: protoc-gen-validate
      13   │     branch: main
      14   │     commit: 3cad65fc486c46c2b30b8b6e1e25f1d5
      15   │     digest: b1-2jXe4lM1oODjIukjnWZ6p8VmYmpkyuhHnW9X5WaSxhc=
      16   │     create_time: 2021-04-26T14:55:41.529001Z
    $ buf beta mod export buf.build/beta/protoc-gen-validate -o .
    $ cat buf.lock
           │ File: buf.lock
       1   │ # Generated by buf. DO NOT EDIT.
       2   │ deps: []
    

    Expected Outcome

    The lock file has top level keys for each possible mod that could be exported into the directory.

    opened by jzelinskie 1
  • Add buf protoc --descriptor_set_in

    Add buf protoc --descriptor_set_in

    Feature 
    opened by bufdev 5
  • `protoc` not resolving arguments using include paths

    `protoc` not resolving arguments using include paths

    Given some directory layout under the current working directory like pkg/a/a.proto and lib/b/b.proto, this protobuf protoc invocation succeeds: protoc --go_out=tmp -I pkg -I lib a/a.proto. Note that the argument "a/a.proto" is not a path to a file in current working directory and is relying on being resolved using -I pkg.

    The corresponding buf protoc invocation looks like it is not using the -I pkg to resolve its arguments: buf protoc --go_out=tmp -I pkg -I lib a/a.proto returns

    path "/Users/david/code/protodemo/a/a.proto" is not contained within any of roots "/Users/david/code/protodemo/lib", and "/Users/david/code/protodemo/pkg" - note that specified paths cannot be roots, but must be contained within roots

    Bug 
    opened by dt 4
  • Relax root overlap requirements for `buf protoc`

    Relax root overlap requirements for `buf protoc`

    See https://github.com/cockroachdb/cockroach/pull/66913#issuecomment-870092892

    $ protoc -o /dev/null -I proto -I . $(buf ls-files proto)
    buf/alpha/registry/v1alpha1/resolve.proto:20:1: warning: Import buf/alpha/registry/v1alpha1/module.proto is unused.
    $ buf protoc -o /dev/null -I proto -I . $(buf ls-files proto)
    include directory "/home/foo/dev/buf/proto" is within include directory "/home/foo/dev/buf" which is not allowed
    
    Bug 
    opened by bufdev 2
  • buf `breaking --against .git#…` can only be used with local branch names

    buf `breaking --against .git#…` can only be used with local branch names

    I believe everything about this issue was already said in #303, but as was requested in #338 here is reproducible example:

    $ mkdir buf-non-local-branch
    $ cd buf-non-local-branch
    $ mkdir first
    $ cd first 
    $ git init
    Initialized empty Git repository in /home/powerman/tmp/buf-non-local-branch/first/.git/
    $ echo 'version: v1beta1' > buf.yaml
    $ touch service.proto
    $ git add .
    $ git commit -m one
    [master (root-commit) c3dc449] one
     2 files changed, 1 insertion(+)
     create mode 100644 buf.yaml
     create mode 100644 service.proto
    $ cd ..
    $ git clone first second
    Cloning into 'second'...
    done.
    $ cd second
    $ git checkout -b example
    Switched to a new branch 'example'
    $ git commit --allow-empty -m two
    [example a04d5c1] two
    $ buf breaking --against '.git#branch=master'
    $ buf breaking --against '.git#ref=origin/master'
    $ git branch -d master 
    Deleted branch master (was c3dc449).
    $ buf breaking --against '.git#branch=master'
    Failure: could not clone file:///home/powerman/tmp/buf-non-local-branch/second/.git: exit status 128
    Cloning into ''...
    warning: Could not find remote branch master to clone.
    fatal: Remote branch master not found in upstream origin
    .
    $ buf breaking --against '.git#ref=origin/master'
    Failure: could not clone file:///home/powerman/tmp/buf-non-local-branch/second/.git: exit status 1
    error: pathspec 'origin/master' did not match any file(s) known to git
    .
    $ 
    
    opened by powerman 4
  • [Lint] Enforce specific type usage in Proto files

    [Lint] Enforce specific type usage in Proto files

    Currently we have some best practices in our org that we would want to enforce on specific types users should use for primitives or wrapper types such as StringValue.

    Would it be possible for Buf to add support for some custom rules which could be configured to allow enforcing all int64 types are sint64 for example?

    There are many types in Protobuf 3 which leads to confusion and bad decisions taken on part by an unsuspecting user (see https://stackoverflow.com/questions/765916/is-there-ever-a-good-time-to-use-int32-instead-of-sint32-in-google-protocol-buff).

    If this could be configurable that would be great. The granularity would be to disallow certain datatypes from appearing or another way could be doing an allowed type list as well (StringValue, IntValue, sint64, etc).

    This would help us enforce these rules through automation rather than through documentation, word of mouth or PR review.

    opened by AlexeiZenin 1
  • Add format command

    Add format command

    Everyone loves go fmt so I think many people would be thankful for a buf fmt command.

    Feature P3 
    opened by borud 1
  • IntelliJ IDEA integration

    IntelliJ IDEA integration

    Any plans to support developers with IntelliJ IDEA?

    Feature P3 
    opened by listepo 3
  • protoc disallows option or reserved as enum value names

    protoc disallows option or reserved as enum value names

    Given:

    mkdir tmp
    cd tmp
    cat >> test.proto <<EOL
    syntax="proto3";
    enum EnumWithOptions {
      zero = 0;
      first = 1;
      second = 2;
      option = 3;
    }
    EOL
    protoc test.proto -o out.pb
    

    Result:

    test.proto:6:10: Expected identifier.
    

    Given:

    buf image build --exclude-source-info --output image.json
    jq '.' < image.json
    

    Result:

    {
      "file": [
        {
          "name": "test.proto",
          "enumType": [
            {
              "name": "EnumWithOptions",
              "value": [
                {
                  "name": "zero",
                  "number": 0
                },
                {
                  "name": "first",
                  "number": 1
                },
                {
                  "name": "second",
                  "number": 2
                },
                {
                  "name": "option",
                  "number": 3
                }
              ]
            }
          ],
          "syntax": "proto3"
        }
      ],
      "bufbuildImageExtension": {
        "imageImportRefs": []
      }
    }
    
    Cleanup P2 
    opened by sgtsquiggs 4
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