actions-runner/artifactcache/handler.go

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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package artifactcache
import (
"context"
"fmt"
"net"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/go-chi/render"
"github.com/nektos/act/pkg/common"
log "github.com/sirupsen/logrus"
_ "modernc.org/sqlite"
"xorm.io/builder"
"xorm.io/xorm"
)
const (
urlBase = "/_apis/artifactcache"
)
var logger = log.StandardLogger().WithField("module", "cache_request")
type Handler struct {
engine engine
storage *Storage
router *chi.Mux
listener net.Listener
gc atomic.Bool
gcAt time.Time
}
func NewHandler() (*Handler, error) {
h := &Handler{}
dir := "" // TODO: make the dir configurable if necessary
if home, err := os.UserHomeDir(); err != nil {
return nil, err
} else {
dir = filepath.Join(home, ".cache/actcache")
}
if err := os.MkdirAll(dir, 0o755); err != nil {
return nil, err
}
e, err := xorm.NewEngine("sqlite", filepath.Join(dir, "sqlite.db"))
if err != nil {
return nil, err
}
if err := e.Sync(&Cache{}); err != nil {
return nil, err
}
h.engine = engine{e: e}
storage, err := NewStorage(filepath.Join(dir, "cache"))
if err != nil {
return nil, err
}
h.storage = storage
router := chi.NewRouter()
router.Use(middleware.RequestLogger(&middleware.DefaultLogFormatter{Logger: logger}))
router.Use(func(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
handler.ServeHTTP(w, r)
go h.gcCache()
})
})
router.Use(middleware.Logger)
router.Route(urlBase, func(r chi.Router) {
r.Get("/cache", h.find)
r.Route("/caches", func(r chi.Router) {
r.Post("/", h.reserve)
r.Route("/{id}", func(r chi.Router) {
r.Patch("/", h.upload)
r.Post("/", h.commit)
})
})
r.Get("/artifacts/{id}", h.get)
r.Post("/clean", h.clean)
})
h.router = router
h.gcCache()
// TODO: make the port configurable if necessary
listener, err := net.Listen("tcp", ":0") // random available port
if err != nil {
return nil, err
}
go func() {
if err := http.Serve(listener, h.router); err != nil {
logger.Errorf("http serve: %v", err)
}
}()
h.listener = listener
return h, nil
}
func (h *Handler) ExternalURL() string {
// TODO: make the external url configurable if necessary
return fmt.Sprintf("http://%s:%d",
common.GetOutboundIP().String(),
h.listener.Addr().(*net.TCPAddr).Port)
}
// GET /_apis/artifactcache/cache
func (h *Handler) find(w http.ResponseWriter, r *http.Request) {
keys := strings.Split(r.URL.Query().Get("keys"), ",")
version := r.URL.Query().Get("version")
cache, err := h.findCache(r.Context(), keys, version)
if err != nil {
responseJson(w, r, 500, err)
return
}
if cache == nil {
responseJson(w, r, 204)
return
}
if ok, err := h.storage.Exist(cache.ID); err != nil {
responseJson(w, r, 500, err)
return
} else if !ok {
_ = h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Delete(cache)
return err
})
responseJson(w, r, 204)
return
}
responseJson(w, r, 200, map[string]any{
"result": "hit",
"archiveLocation": fmt.Sprintf("%s%s/artifacts/%d", h.ExternalURL(), urlBase, cache.ID),
"cacheKey": cache.Key,
})
}
// POST /_apis/artifactcache/caches
func (h *Handler) reserve(w http.ResponseWriter, r *http.Request) {
cache := &Cache{}
if err := render.Bind(r, cache); err != nil {
responseJson(w, r, 400, err)
return
}
if ok, err := h.engine.ExecBool(func(sess *xorm.Session) (bool, error) {
return sess.Where(builder.Eq{"key": cache.Key, "version": cache.Version}).Get(&Cache{})
}); err != nil {
responseJson(w, r, 500, err)
return
} else if ok {
responseJson(w, r, 400, fmt.Errorf("already exist"))
return
}
if err := h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Insert(cache)
return err
}); err != nil {
responseJson(w, r, 500, err)
return
}
responseJson(w, r, 200, map[string]any{
"cacheId": cache.ID,
})
return
}
// PATCH /_apis/artifactcache/caches/:id
func (h *Handler) upload(w http.ResponseWriter, r *http.Request) {
id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
if err != nil {
responseJson(w, r, 400, err)
return
}
cache := &Cache{
ID: id,
}
if ok, err := h.engine.ExecBool(func(sess *xorm.Session) (bool, error) {
return sess.Get(cache)
}); err != nil {
responseJson(w, r, 500, err)
return
} else if !ok {
responseJson(w, r, 400, fmt.Errorf("cache %d: not reserved", id))
return
}
if cache.Complete {
responseJson(w, r, 400, fmt.Errorf("cache %v %q: already complete", cache.ID, cache.Key))
return
}
start, _, err := parseContentRange(r.Header.Get("Content-Range"))
if err != nil {
responseJson(w, r, 400, err)
return
}
if err := h.storage.Write(cache.ID, start, r.Body); err != nil {
responseJson(w, r, 500, err)
}
h.useCache(r.Context(), id)
responseJson(w, r, 200)
}
// POST /_apis/artifactcache/caches/:id
func (h *Handler) commit(w http.ResponseWriter, r *http.Request) {
id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
if err != nil {
responseJson(w, r, 400, err)
return
}
cache := &Cache{
ID: id,
}
if ok, err := h.engine.ExecBool(func(sess *xorm.Session) (bool, error) {
return sess.Get(cache)
}); err != nil {
responseJson(w, r, 500, err)
return
} else if !ok {
responseJson(w, r, 400, fmt.Errorf("cache %d: not reserved", id))
return
}
if cache.Complete {
responseJson(w, r, 400, fmt.Errorf("cache %v %q: already complete", cache.ID, cache.Key))
return
}
if err := h.storage.Commit(cache.ID, cache.Size); err != nil {
responseJson(w, r, 500, err)
return
}
cache.Complete = true
if err := h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.ID(cache.ID).Cols("complete").Update(cache)
return err
}); err != nil {
responseJson(w, r, 500, err)
return
}
responseJson(w, r, 200)
}
// GET /_apis/artifactcache/artifacts/:id
func (h *Handler) get(w http.ResponseWriter, r *http.Request) {
id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
if err != nil {
responseJson(w, r, 400, err)
return
}
h.useCache(r.Context(), id)
h.storage.Serve(w, r, id)
}
// POST /_apis/artifactcache/clean
func (h *Handler) clean(w http.ResponseWriter, r *http.Request) {
// TODO: don't support force deleting cache entries
// see: https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
responseJson(w, r, 200)
}
// if not found, return (nil, nil) instead of an error.
func (h *Handler) findCache(ctx context.Context, keys []string, version string) (*Cache, error) {
if len(keys) == 0 {
return nil, nil
}
key := keys[0] // the first key is for exact match.
cache := &Cache{}
if ok, err := h.engine.ExecBool(func(sess *xorm.Session) (bool, error) {
return sess.Where(builder.Eq{"key": key, "version": version, "complete": true}).Get(cache)
}); err != nil {
return nil, err
} else if ok {
return cache, nil
}
for _, prefix := range keys[1:] {
if ok, err := h.engine.ExecBool(func(sess *xorm.Session) (bool, error) {
return sess.Where(builder.And(
builder.Like{"key", prefix + "%"},
builder.Eq{"version": version, "complete": true},
)).OrderBy("id DESC").Get(cache)
}); err != nil {
return nil, err
} else if ok {
return cache, nil
}
}
return nil, nil
}
func (h *Handler) useCache(ctx context.Context, id int64) {
// keep quiet
_ = h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Context(ctx).Cols("used_at").Update(&Cache{
ID: id,
UsedAt: time.Now().Unix(),
})
return err
})
}
func (h *Handler) gcCache() {
if h.gc.Load() {
return
}
if !h.gc.CompareAndSwap(false, true) {
return
}
defer h.gc.Store(false)
if time.Since(h.gcAt) < time.Hour {
logger.Infof("skip gc: %v", h.gcAt.String())
return
}
h.gcAt = time.Now()
logger.Infof("gc: %v", h.gcAt.String())
const (
keepUsed = 30 * 24 * time.Hour
keepUnused = 7 * 24 * time.Hour
keepTemp = 5 * time.Minute
)
var caches []*Cache
if err := h.engine.Exec(func(sess *xorm.Session) error {
return sess.Where(builder.And(builder.Lt{"used_at": time.Now().Add(-keepTemp).Unix()}, builder.Eq{"complete": false})).
Find(&caches)
}); err != nil {
logger.Warnf("find caches: %v", err)
} else {
for _, cache := range caches {
h.storage.Remove(cache.ID)
if err := h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Delete(cache)
return err
}); err != nil {
logger.Warnf("delete cache: %v", err)
continue
}
logger.Infof("deleted cache: %+v", cache)
}
}
caches = caches[:0]
if err := h.engine.Exec(func(sess *xorm.Session) error {
return sess.Where(builder.Lt{"used_at": time.Now().Add(-keepUnused).Unix()}).
Find(&caches)
}); err != nil {
logger.Warnf("find caches: %v", err)
} else {
for _, cache := range caches {
h.storage.Remove(cache.ID)
if err := h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Delete(cache)
return err
}); err != nil {
logger.Warnf("delete cache: %v", err)
continue
}
logger.Infof("deleted cache: %+v", cache)
}
}
caches = caches[:0]
if err := h.engine.Exec(func(sess *xorm.Session) error {
return sess.Where(builder.Lt{"created_at": time.Now().Add(-keepUsed).Unix()}).
Find(&caches)
}); err != nil {
logger.Warnf("find caches: %v", err)
} else {
for _, cache := range caches {
h.storage.Remove(cache.ID)
if err := h.engine.Exec(func(sess *xorm.Session) error {
_, err := sess.Delete(cache)
return err
}); err != nil {
logger.Warnf("delete cache: %v", err)
continue
}
logger.Infof("deleted cache: %+v", cache)
}
}
}