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forgejo/routers/api/v1/repo/commits.go
Lunny Xiao bd820aa9c5
Add context cache as a request level cache (#22294)
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.
2023-02-15 21:37:34 +08:00

286 lines
7.7 KiB
Go

// Copyright 2018 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package repo
import (
"fmt"
"math"
"net/http"
"strconv"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/setting"
api "code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/routers/api/v1/utils"
"code.gitea.io/gitea/services/convert"
)
// GetSingleCommit get a commit via sha
func GetSingleCommit(ctx *context.APIContext) {
// swagger:operation GET /repos/{owner}/{repo}/git/commits/{sha} repository repoGetSingleCommit
// ---
// summary: Get a single commit from a repository
// produces:
// - application/json
// parameters:
// - name: owner
// in: path
// description: owner of the repo
// type: string
// required: true
// - name: repo
// in: path
// description: name of the repo
// type: string
// required: true
// - name: sha
// in: path
// description: a git ref or commit sha
// type: string
// required: true
// responses:
// "200":
// "$ref": "#/responses/Commit"
// "422":
// "$ref": "#/responses/validationError"
// "404":
// "$ref": "#/responses/notFound"
sha := ctx.Params(":sha")
if !git.IsValidRefPattern(sha) {
ctx.Error(http.StatusUnprocessableEntity, "no valid ref or sha", fmt.Sprintf("no valid ref or sha: %s", sha))
return
}
getCommit(ctx, sha)
}
func getCommit(ctx *context.APIContext, identifier string) {
commit, err := ctx.Repo.GitRepo.GetCommit(identifier)
if err != nil {
if git.IsErrNotExist(err) {
ctx.NotFound(identifier)
return
}
ctx.Error(http.StatusInternalServerError, "gitRepo.GetCommit", err)
return
}
json, err := convert.ToCommit(ctx, ctx.Repo.Repository, ctx.Repo.GitRepo, commit, nil, true)
if err != nil {
ctx.Error(http.StatusInternalServerError, "toCommit", err)
return
}
ctx.JSON(http.StatusOK, json)
}
// GetAllCommits get all commits via
func GetAllCommits(ctx *context.APIContext) {
// swagger:operation GET /repos/{owner}/{repo}/commits repository repoGetAllCommits
// ---
// summary: Get a list of all commits from a repository
// produces:
// - application/json
// parameters:
// - name: owner
// in: path
// description: owner of the repo
// type: string
// required: true
// - name: repo
// in: path
// description: name of the repo
// type: string
// required: true
// - name: sha
// in: query
// description: SHA or branch to start listing commits from (usually 'master')
// type: string
// - name: path
// in: query
// description: filepath of a file/dir
// type: string
// - name: stat
// in: query
// description: include diff stats for every commit (disable for speedup, default 'true')
// type: boolean
// - name: page
// in: query
// description: page number of results to return (1-based)
// type: integer
// - name: limit
// in: query
// description: page size of results (ignored if used with 'path')
// type: integer
// responses:
// "200":
// "$ref": "#/responses/CommitList"
// "404":
// "$ref": "#/responses/notFound"
// "409":
// "$ref": "#/responses/EmptyRepository"
if ctx.Repo.Repository.IsEmpty {
ctx.JSON(http.StatusConflict, api.APIError{
Message: "Git Repository is empty.",
URL: setting.API.SwaggerURL,
})
return
}
listOptions := utils.GetListOptions(ctx)
if listOptions.Page <= 0 {
listOptions.Page = 1
}
if listOptions.PageSize > setting.Git.CommitsRangeSize {
listOptions.PageSize = setting.Git.CommitsRangeSize
}
sha := ctx.FormString("sha")
path := ctx.FormString("path")
var (
commitsCountTotal int64
commits []*git.Commit
err error
)
if len(path) == 0 {
var baseCommit *git.Commit
if len(sha) == 0 {
// no sha supplied - use default branch
head, err := ctx.Repo.GitRepo.GetHEADBranch()
if err != nil {
ctx.Error(http.StatusInternalServerError, "GetHEADBranch", err)
return
}
baseCommit, err = ctx.Repo.GitRepo.GetBranchCommit(head.Name)
if err != nil {
ctx.Error(http.StatusInternalServerError, "GetCommit", err)
return
}
} else {
// get commit specified by sha
baseCommit, err = ctx.Repo.GitRepo.GetCommit(sha)
if err != nil {
ctx.Error(http.StatusInternalServerError, "GetCommit", err)
return
}
}
// Total commit count
commitsCountTotal, err = baseCommit.CommitsCount()
if err != nil {
ctx.Error(http.StatusInternalServerError, "GetCommitsCount", err)
return
}
// Query commits
commits, err = baseCommit.CommitsByRange(listOptions.Page, listOptions.PageSize)
if err != nil {
ctx.Error(http.StatusInternalServerError, "CommitsByRange", err)
return
}
} else {
if len(sha) == 0 {
sha = ctx.Repo.Repository.DefaultBranch
}
commitsCountTotal, err = ctx.Repo.GitRepo.FileCommitsCount(sha, path)
if err != nil {
ctx.Error(http.StatusInternalServerError, "FileCommitsCount", err)
return
} else if commitsCountTotal == 0 {
ctx.NotFound("FileCommitsCount", nil)
return
}
commits, err = ctx.Repo.GitRepo.CommitsByFileAndRange(sha, path, listOptions.Page)
if err != nil {
ctx.Error(http.StatusInternalServerError, "CommitsByFileAndRange", err)
return
}
}
pageCount := int(math.Ceil(float64(commitsCountTotal) / float64(listOptions.PageSize)))
userCache := make(map[string]*user_model.User)
apiCommits := make([]*api.Commit, len(commits))
stat := ctx.FormString("stat") == "" || ctx.FormBool("stat")
for i, commit := range commits {
// Create json struct
apiCommits[i], err = convert.ToCommit(ctx, ctx.Repo.Repository, ctx.Repo.GitRepo, commit, userCache, stat)
if err != nil {
ctx.Error(http.StatusInternalServerError, "toCommit", err)
return
}
}
ctx.SetLinkHeader(int(commitsCountTotal), listOptions.PageSize)
ctx.SetTotalCountHeader(commitsCountTotal)
// kept for backwards compatibility
ctx.RespHeader().Set("X-Page", strconv.Itoa(listOptions.Page))
ctx.RespHeader().Set("X-PerPage", strconv.Itoa(listOptions.PageSize))
ctx.RespHeader().Set("X-Total", strconv.FormatInt(commitsCountTotal, 10))
ctx.RespHeader().Set("X-PageCount", strconv.Itoa(pageCount))
ctx.RespHeader().Set("X-HasMore", strconv.FormatBool(listOptions.Page < pageCount))
ctx.AppendAccessControlExposeHeaders("X-Page", "X-PerPage", "X-Total", "X-PageCount", "X-HasMore")
ctx.JSON(http.StatusOK, &apiCommits)
}
// DownloadCommitDiffOrPatch render a commit's raw diff or patch
func DownloadCommitDiffOrPatch(ctx *context.APIContext) {
// swagger:operation GET /repos/{owner}/{repo}/git/commits/{sha}.{diffType} repository repoDownloadCommitDiffOrPatch
// ---
// summary: Get a commit's diff or patch
// produces:
// - text/plain
// parameters:
// - name: owner
// in: path
// description: owner of the repo
// type: string
// required: true
// - name: repo
// in: path
// description: name of the repo
// type: string
// required: true
// - name: sha
// in: path
// description: SHA of the commit to get
// type: string
// required: true
// - name: diffType
// in: path
// description: whether the output is diff or patch
// type: string
// enum: [diff, patch]
// required: true
// responses:
// "200":
// "$ref": "#/responses/string"
// "404":
// "$ref": "#/responses/notFound"
sha := ctx.Params(":sha")
diffType := git.RawDiffType(ctx.Params(":diffType"))
if err := git.GetRawDiff(ctx.Repo.GitRepo, sha, diffType, ctx.Resp); err != nil {
if git.IsErrNotExist(err) {
ctx.NotFound(sha)
return
}
ctx.Error(http.StatusInternalServerError, "DownloadCommitDiffOrPatch", err)
return
}
}