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.
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package convert
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import (
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"context"
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"code.gitea.io/gitea/models/perm"
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user_model "code.gitea.io/gitea/models/user"
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api "code.gitea.io/gitea/modules/structs"
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)
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// ToUser convert user_model.User to api.User
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// if doer is set, private information is added if the doer has the permission to see it
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func ToUser(ctx context.Context, user, doer *user_model.User) *api.User {
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if user == nil {
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return nil
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}
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authed := false
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signed := false
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if doer != nil {
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signed = true
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authed = doer.ID == user.ID || doer.IsAdmin
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}
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return toUser(ctx, user, signed, authed)
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}
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// ToUsers convert list of user_model.User to list of api.User
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func ToUsers(ctx context.Context, doer *user_model.User, users []*user_model.User) []*api.User {
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result := make([]*api.User, len(users))
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for i := range users {
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result[i] = ToUser(ctx, users[i], doer)
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}
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return result
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}
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// ToUserWithAccessMode convert user_model.User to api.User
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// AccessMode is not none show add some more information
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func ToUserWithAccessMode(ctx context.Context, user *user_model.User, accessMode perm.AccessMode) *api.User {
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if user == nil {
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return nil
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}
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return toUser(ctx, user, accessMode != perm.AccessModeNone, false)
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}
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// toUser convert user_model.User to api.User
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// signed shall only be set if requester is logged in. authed shall only be set if user is site admin or user himself
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func toUser(ctx context.Context, user *user_model.User, signed, authed bool) *api.User {
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result := &api.User{
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ID: user.ID,
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UserName: user.Name,
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FullName: user.FullName,
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Email: user.GetEmail(),
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AvatarURL: user.AvatarLink(ctx),
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Created: user.CreatedUnix.AsTime(),
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Restricted: user.IsRestricted,
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Location: user.Location,
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Website: user.Website,
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Description: user.Description,
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// counter's
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Followers: user.NumFollowers,
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Following: user.NumFollowing,
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StarredRepos: user.NumStars,
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}
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result.Visibility = user.Visibility.String()
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// hide primary email if API caller is anonymous or user keep email private
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if signed && (!user.KeepEmailPrivate || authed) {
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result.Email = user.Email
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}
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// only site admin will get these information and possibly user himself
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if authed {
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result.IsAdmin = user.IsAdmin
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result.LoginName = user.LoginName
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result.LastLogin = user.LastLoginUnix.AsTime()
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result.Language = user.Language
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result.IsActive = user.IsActive
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result.ProhibitLogin = user.ProhibitLogin
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}
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return result
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}
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// User2UserSettings return UserSettings based on a user
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func User2UserSettings(user *user_model.User) api.UserSettings {
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return api.UserSettings{
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FullName: user.FullName,
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Website: user.Website,
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Location: user.Location,
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Language: user.Language,
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Description: user.Description,
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Theme: user.Theme,
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HideEmail: user.KeepEmailPrivate,
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HideActivity: user.KeepActivityPrivate,
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DiffViewStyle: user.DiffViewStyle,
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}
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}
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// ToUserAndPermission return User and its collaboration permission for a repository
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func ToUserAndPermission(ctx context.Context, user, doer *user_model.User, accessMode perm.AccessMode) api.RepoCollaboratorPermission {
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return api.RepoCollaboratorPermission{
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User: ToUser(ctx, user, doer),
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Permission: accessMode.String(),
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RoleName: accessMode.String(),
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}
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}
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