mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
121 lines
3.7 KiB
Markdown
121 lines
3.7 KiB
Markdown
# Coding Conventions
|
|
|
|
Please follow coding conventions and guidelines described in the following documents:
|
|
|
|
* [Go proverbs](https://go-proverbs.github.io/) - highly recommended read
|
|
* [CodeReviewComments](https://github.com/golang/go/wiki/CodeReviewComments)
|
|
* [Effective Go](https://golang.org/doc/effective_go.html)
|
|
* [How to Write a Git Commit Message](https://chris.beams.io/posts/git-commit/)
|
|
|
|
Here's a list of some more specific conventions that are often followed in
|
|
the code and will be pointed out in the review process:
|
|
|
|
## General
|
|
|
|
* Keep variable names short for variables that are local to the function.
|
|
* Do not export a function or variable name outside the package until you
|
|
have an external consumer for it.
|
|
|
|
### Imports
|
|
|
|
We use the following convention for specifying imports:
|
|
|
|
```
|
|
<import standard library packages>
|
|
|
|
<import ceph-csi packages>
|
|
|
|
<import third-party packages>
|
|
```
|
|
|
|
Example:
|
|
|
|
```go
|
|
import (
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/ceph/ceph-csi/internal/util"
|
|
|
|
"github.com/pborman/uuid"
|
|
)
|
|
```
|
|
|
|
### Error Handling
|
|
|
|
* Use variable name `err` to denote error variable during a function call.
|
|
* Reuse the previously declared `err` variable as long as it is in scope.
|
|
For example, do not use `errWrite` or `errRead`.
|
|
* Do not panic() for errors that can be bubbled up back to user. Use panic()
|
|
only for fatal errors which shouldn't occur.
|
|
* Do not ignore errors using `_` variable unless you know what you're doing.
|
|
* Error strings should not start with a capital letter.
|
|
* If error requires passing of extra information, you can define a new type
|
|
* Error types should end with `Error`.
|
|
|
|
### Logging
|
|
|
|
* The inner-most utility functions should never log. Logging must almost always
|
|
be done by the caller on receiving an `error`.
|
|
* Always use log level `DEBUG` to provide useful **diagnostic information** to
|
|
developers or sysadmins.
|
|
* Use log level `INFO` to provide information to users or sysadmins. This is the
|
|
kind of information you'd like to log in an out-of-the-box configuration in
|
|
happy scenario.
|
|
* Use log level `WARN` when something fails but there's a workaround or fallback
|
|
or retry for it and/or is fully recoverable.
|
|
* Use log level `ERROR` when something occurs which is fatal to the operation,
|
|
but not to the service or application.
|
|
|
|
### Wrap long lines
|
|
|
|
At present, we restrict the number of chars in a line to `120` which is the
|
|
default value for the `lll` linter check we have in CI. If your source code line
|
|
or comment goes beyond this limit please try to organize it in such a way it
|
|
is within the line length limit and help on code reading.
|
|
|
|
Example:
|
|
|
|
```
|
|
_, err := framework.RunKubectl(cephCSINamespace, "delete", "cm", "ceph-csi-encryption-kms-config", "--namespace", cephCSINamespace, "--ignore-not-found=true")
|
|
```
|
|
|
|
Instead of above long function signature, we can organize it to something like below
|
|
which is clear and help on easy code reading.
|
|
|
|
```
|
|
_, err := framework.RunKubectl(
|
|
cephCSINamespace,
|
|
"delete",
|
|
"cm",
|
|
"ceph-csi-encryption-kms-config",
|
|
"--namespace",
|
|
cephCSINamespace,
|
|
"--ignore-not-found=true")
|
|
```
|
|
|
|
### Mark Down Rules
|
|
|
|
* MD014 - Dollar signs used before commands without showing output
|
|
|
|
The dollar signs are unnecessary, it is easier to copy and paste and
|
|
less noisy if the dollar signs are omitted. Especially when the
|
|
command doesn't list the output, but if the command follows output
|
|
we can use '$ ' (dollar+space) mainly to differentiate between
|
|
command and its output.
|
|
|
|
scenario 1: when command doesn't follow output
|
|
|
|
```console
|
|
cd ~/work
|
|
```
|
|
|
|
scenario 2: when command follow output (use dollar+space)
|
|
|
|
```console
|
|
$ ls ~/work
|
|
file1 file2 dir1 dir2 ...
|
|
```
|