mirror of
https://github.com/go-gitea/gitea.git
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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.
196 lines
5.4 KiB
Go
196 lines
5.4 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package repository
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import (
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"context"
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"fmt"
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"net/url"
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"time"
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"code.gitea.io/gitea/models/avatars"
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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/setting"
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api "code.gitea.io/gitea/modules/structs"
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)
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// PushCommit represents a commit in a push operation.
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type PushCommit struct {
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Sha1 string
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Message string
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AuthorEmail string
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AuthorName string
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CommitterEmail string
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CommitterName string
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Timestamp time.Time
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}
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// PushCommits represents list of commits in a push operation.
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type PushCommits struct {
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Commits []*PushCommit
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HeadCommit *PushCommit
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CompareURL string
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Len int
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avatars map[string]string
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emailUsers map[string]*user_model.User
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}
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// NewPushCommits creates a new PushCommits object.
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func NewPushCommits() *PushCommits {
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return &PushCommits{
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avatars: make(map[string]string),
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emailUsers: make(map[string]*user_model.User),
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}
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}
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// toAPIPayloadCommit converts a single PushCommit to an api.PayloadCommit object.
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func (pc *PushCommits) toAPIPayloadCommit(ctx context.Context, repoPath, repoLink string, commit *PushCommit) (*api.PayloadCommit, error) {
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var err error
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authorUsername := ""
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author, ok := pc.emailUsers[commit.AuthorEmail]
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if !ok {
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author, err = user_model.GetUserByEmail(ctx, commit.AuthorEmail)
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if err == nil {
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authorUsername = author.Name
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pc.emailUsers[commit.AuthorEmail] = author
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}
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} else {
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authorUsername = author.Name
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}
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committerUsername := ""
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committer, ok := pc.emailUsers[commit.CommitterEmail]
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if !ok {
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committer, err = user_model.GetUserByEmail(ctx, commit.CommitterEmail)
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if err == nil {
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// TODO: check errors other than email not found.
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committerUsername = committer.Name
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pc.emailUsers[commit.CommitterEmail] = committer
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}
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} else {
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committerUsername = committer.Name
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}
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fileStatus, err := git.GetCommitFileStatus(ctx, repoPath, commit.Sha1)
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if err != nil {
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return nil, fmt.Errorf("FileStatus [commit_sha1: %s]: %w", commit.Sha1, err)
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}
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return &api.PayloadCommit{
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ID: commit.Sha1,
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Message: commit.Message,
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URL: fmt.Sprintf("%s/commit/%s", repoLink, url.PathEscape(commit.Sha1)),
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Author: &api.PayloadUser{
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Name: commit.AuthorName,
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Email: commit.AuthorEmail,
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UserName: authorUsername,
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},
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Committer: &api.PayloadUser{
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Name: commit.CommitterName,
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Email: commit.CommitterEmail,
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UserName: committerUsername,
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},
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Added: fileStatus.Added,
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Removed: fileStatus.Removed,
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Modified: fileStatus.Modified,
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Timestamp: commit.Timestamp,
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}, nil
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}
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// ToAPIPayloadCommits converts a PushCommits object to api.PayloadCommit format.
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// It returns all converted commits and, if provided, the head commit or an error otherwise.
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func (pc *PushCommits) ToAPIPayloadCommits(ctx context.Context, repoPath, repoLink string) ([]*api.PayloadCommit, *api.PayloadCommit, error) {
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commits := make([]*api.PayloadCommit, len(pc.Commits))
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var headCommit *api.PayloadCommit
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if pc.emailUsers == nil {
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pc.emailUsers = make(map[string]*user_model.User)
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}
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for i, commit := range pc.Commits {
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apiCommit, err := pc.toAPIPayloadCommit(ctx, repoPath, repoLink, commit)
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if err != nil {
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return nil, nil, err
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}
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commits[i] = apiCommit
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if pc.HeadCommit != nil && pc.HeadCommit.Sha1 == commits[i].ID {
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headCommit = apiCommit
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}
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}
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if pc.HeadCommit != nil && headCommit == nil {
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var err error
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headCommit, err = pc.toAPIPayloadCommit(ctx, repoPath, repoLink, pc.HeadCommit)
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if err != nil {
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return nil, nil, err
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}
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}
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return commits, headCommit, nil
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}
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// AvatarLink tries to match user in database with e-mail
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// in order to show custom avatar, and falls back to general avatar link.
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func (pc *PushCommits) AvatarLink(ctx context.Context, email string) string {
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if pc.avatars == nil {
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pc.avatars = make(map[string]string)
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}
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avatar, ok := pc.avatars[email]
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if ok {
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return avatar
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}
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size := avatars.DefaultAvatarPixelSize * setting.Avatar.RenderedSizeFactor
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u, ok := pc.emailUsers[email]
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if !ok {
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var err error
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u, err = user_model.GetUserByEmail(ctx, email)
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if err != nil {
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pc.avatars[email] = avatars.GenerateEmailAvatarFastLink(ctx, email, size)
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if !user_model.IsErrUserNotExist(err) {
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log.Error("GetUserByEmail: %v", err)
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return ""
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}
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} else {
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pc.emailUsers[email] = u
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}
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}
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if u != nil {
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pc.avatars[email] = u.AvatarLinkWithSize(ctx, size)
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}
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return pc.avatars[email]
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}
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// CommitToPushCommit transforms a git.Commit to PushCommit type.
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func CommitToPushCommit(commit *git.Commit) *PushCommit {
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return &PushCommit{
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Sha1: commit.ID.String(),
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Message: commit.Message(),
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AuthorEmail: commit.Author.Email,
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AuthorName: commit.Author.Name,
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CommitterEmail: commit.Committer.Email,
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CommitterName: commit.Committer.Name,
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Timestamp: commit.Author.When,
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}
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}
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// GitToPushCommits transforms a list of git.Commits to PushCommits type.
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func GitToPushCommits(gitCommits []*git.Commit) *PushCommits {
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commits := make([]*PushCommit, 0, len(gitCommits))
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for _, commit := range gitCommits {
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commits = append(commits, CommitToPushCommit(commit))
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}
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return &PushCommits{
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Commits: commits,
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HeadCommit: nil,
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CompareURL: "",
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Len: len(commits),
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avatars: make(map[string]string),
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emailUsers: make(map[string]*user_model.User),
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}
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}
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