mirror of
https://github.com/ceph/ceph-csi.git
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121 lines
3.7 KiB
Markdown
121 lines
3.7 KiB
Markdown
# Coding Conventions
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Please follow coding conventions and guidelines described in the following documents:
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* [Go proverbs](https://go-proverbs.github.io/) - highly recommended read
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* [CodeReviewComments](https://github.com/golang/go/wiki/CodeReviewComments)
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* [Effective Go](https://golang.org/doc/effective_go.html)
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* [How to Write a Git Commit Message](https://chris.beams.io/posts/git-commit/)
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Here's a list of some more specific conventions that are often followed in
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the code and will be pointed out in the review process:
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## General
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* Keep variable names short for variables that are local to the function.
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* Do not export a function or variable name outside the package until you
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have an external consumer for it.
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### Imports
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We use the following convention for specifying imports:
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```
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<import standard library packages>
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<import ceph-csi packages>
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<import third-party packages>
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```
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Example:
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```go
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import (
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"os"
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"path"
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"strings"
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"time"
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"github.com/ceph/ceph-csi/internal/util"
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"github.com/pborman/uuid"
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)
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```
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### Error Handling
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* Use variable name `err` to denote error variable during a function call.
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* Reuse the previously declared `err` variable as long as it is in scope.
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For example, do not use `errWrite` or `errRead`.
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* Do not panic() for errors that can be bubbled up back to user. Use panic()
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only for fatal errors which shouldn't occur.
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* Do not ignore errors using `_` variable unless you know what you're doing.
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* Error strings should not start with a capital letter.
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* If error requires passing of extra information, you can define a new type
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* Error types should end with `Error`.
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### Logging
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* The inner-most utility functions should never log. Logging must almost always
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be done by the caller on receiving an `error`.
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* Always use log level `DEBUG` to provide useful **diagnostic information** to
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developers or sysadmins.
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* Use log level `INFO` to provide information to users or sysadmins. This is the
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kind of information you'd like to log in an out-of-the-box configuration in
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happy scenario.
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* Use log level `WARN` when something fails but there's a workaround or fallback
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or retry for it and/or is fully recoverable.
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* Use log level `ERROR` when something occurs which is fatal to the operation,
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but not to the service or application.
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### Wrap long lines
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At present, we restrict the number of chars in a line to `120` which is the
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default value for the `lll` linter check we have in CI. If your source code line
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or comment goes beyond this limit please try to organize it in such a way it
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is within the line length limit and help on code reading.
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Example:
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```
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_, err := framework.RunKubectl(cephCSINamespace, "delete", "cm", "ceph-csi-encryption-kms-config", "--namespace", cephCSINamespace, "--ignore-not-found=true")
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```
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Instead of above long function signature, we can organize it to something like below
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which is clear and help on easy code reading.
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```
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_, err := framework.RunKubectl(
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cephCSINamespace,
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"delete",
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"cm",
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"ceph-csi-encryption-kms-config",
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"--namespace",
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cephCSINamespace,
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"--ignore-not-found=true")
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```
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### Mark Down Rules
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* MD014 - Dollar signs used before commands without showing output
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The dollar signs are unnecessary, it is easier to copy and paste and
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less noisy if the dollar signs are omitted. Especially when the
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command doesn't list the output, but if the command follows output
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we can use '$ ' (dollar+space) mainly to differentiate between
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command and its output.
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scenario 1: when command doesn't follow output
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```console
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cd ~/work
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```
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scenario 2: when command follow output (use dollar+space)
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```console
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$ ls ~/work
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file1 file2 dir1 dir2 ...
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```
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