mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-15 06:11:21 +01:00
bd820aa9c5
To avoid duplicated load of the same data in an HTTP request, we can set
a context cache to do that. i.e. Some pages may load a user from a
database with the same id in different areas on the same page. But the
code is hidden in two different deep logic. How should we share the
user? As a result of this PR, now if both entry functions accept
`context.Context` as the first parameter and we just need to refactor
`GetUserByID` to reuse the user from the context cache. Then it will not
be loaded twice on an HTTP request.
But of course, sometimes we would like to reload an object from the
database, that's why `RemoveContextData` is also exposed.
The core context cache is here. It defines a new context
```go
type cacheContext struct {
ctx context.Context
data map[any]map[any]any
lock sync.RWMutex
}
var cacheContextKey = struct{}{}
func WithCacheContext(ctx context.Context) context.Context {
return context.WithValue(ctx, cacheContextKey, &cacheContext{
ctx: ctx,
data: make(map[any]map[any]any),
})
}
```
Then you can use the below 4 methods to read/write/del the data within
the same context.
```go
func GetContextData(ctx context.Context, tp, key any) any
func SetContextData(ctx context.Context, tp, key, value any)
func RemoveContextData(ctx context.Context, tp, key any)
func GetWithContextCache[T any](ctx context.Context, cacheGroupKey string, cacheTargetID any, f func() (T, error)) (T, error)
```
Then let's take a look at how `system.GetString` implement it.
```go
func GetSetting(ctx context.Context, key string) (string, error) {
return cache.GetWithContextCache(ctx, contextCacheKey, key, func() (string, error) {
return cache.GetString(genSettingCacheKey(key), func() (string, error) {
res, err := GetSettingNoCache(ctx, key)
if err != nil {
return "", err
}
return res.SettingValue, nil
})
})
}
```
First, it will check if context data include the setting object with the
key. If not, it will query from the global cache which may be memory or
a Redis cache. If not, it will get the object from the database. In the
end, if the object gets from the global cache or database, it will be
set into the context cache.
An object stored in the context cache will only be destroyed after the
context disappeared.
125 lines
3.4 KiB
Go
125 lines
3.4 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package files
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import (
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"context"
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"fmt"
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"strings"
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"code.gitea.io/gitea/models"
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repo_model "code.gitea.io/gitea/models/repo"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/structs"
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"code.gitea.io/gitea/services/pull"
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)
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// CherryPick cherrypicks or reverts a commit to the given repository
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func CherryPick(ctx context.Context, repo *repo_model.Repository, doer *user_model.User, revert bool, opts *ApplyDiffPatchOptions) (*structs.FileResponse, error) {
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if err := opts.Validate(ctx, repo, doer); err != nil {
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return nil, err
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}
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message := strings.TrimSpace(opts.Message)
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author, committer := GetAuthorAndCommitterUsers(opts.Author, opts.Committer, doer)
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t, err := NewTemporaryUploadRepository(ctx, repo)
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if err != nil {
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log.Error("%v", err)
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}
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defer t.Close()
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if err := t.Clone(opts.OldBranch); err != nil {
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return nil, err
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}
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if err := t.SetDefaultIndex(); err != nil {
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return nil, err
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}
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// Get the commit of the original branch
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commit, err := t.GetBranchCommit(opts.OldBranch)
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if err != nil {
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return nil, err // Couldn't get a commit for the branch
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}
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// Assigned LastCommitID in opts if it hasn't been set
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if opts.LastCommitID == "" {
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opts.LastCommitID = commit.ID.String()
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} else {
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lastCommitID, err := t.gitRepo.ConvertToSHA1(opts.LastCommitID)
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if err != nil {
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return nil, fmt.Errorf("CherryPick: Invalid last commit ID: %w", err)
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}
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opts.LastCommitID = lastCommitID.String()
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if commit.ID.String() != opts.LastCommitID {
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return nil, models.ErrCommitIDDoesNotMatch{
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GivenCommitID: opts.LastCommitID,
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CurrentCommitID: opts.LastCommitID,
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}
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}
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}
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commit, err = t.GetCommit(strings.TrimSpace(opts.Content))
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if err != nil {
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return nil, err
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}
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parent, err := commit.ParentID(0)
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if err != nil {
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parent = git.MustIDFromString(git.EmptyTreeSHA)
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}
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base, right := parent.String(), commit.ID.String()
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if revert {
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right, base = base, right
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}
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description := fmt.Sprintf("CherryPick %s onto %s", right, opts.OldBranch)
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conflict, _, err := pull.AttemptThreeWayMerge(ctx,
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t.basePath, t.gitRepo, base, opts.LastCommitID, right, description)
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if err != nil {
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return nil, fmt.Errorf("failed to three-way merge %s onto %s: %w", right, opts.OldBranch, err)
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}
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if conflict {
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return nil, fmt.Errorf("failed to merge due to conflicts")
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}
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treeHash, err := t.WriteTree()
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if err != nil {
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// likely non-sensical tree due to merge conflicts...
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return nil, err
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}
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// Now commit the tree
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var commitHash string
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if opts.Dates != nil {
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commitHash, err = t.CommitTreeWithDate("HEAD", author, committer, treeHash, message, opts.Signoff, opts.Dates.Author, opts.Dates.Committer)
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} else {
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commitHash, err = t.CommitTree("HEAD", author, committer, treeHash, message, opts.Signoff)
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}
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if err != nil {
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return nil, err
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}
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// Then push this tree to NewBranch
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if err := t.Push(doer, commitHash, opts.NewBranch); err != nil {
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return nil, err
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}
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commit, err = t.GetCommit(commitHash)
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if err != nil {
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return nil, err
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}
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fileCommitResponse, _ := GetFileCommitResponse(repo, commit) // ok if fails, then will be nil
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verification := GetPayloadCommitVerification(ctx, commit)
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fileResponse := &structs.FileResponse{
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Commit: fileCommitResponse,
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Verification: verification,
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}
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return fileResponse, nil
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}
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