frostfs-s3-gw/api/middleware/metrics.go

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package middleware
import (
"context"
"io"
"net/http"
"strings"
"sync"
"sync/atomic"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
"go.uber.org/zap"
)
type (
readCounter struct {
io.ReadCloser
countBytes uint64
}
writeCounter struct {
http.ResponseWriter
countBytes uint64
}
responseWrapper struct {
sync.Once
http.ResponseWriter
statusCode int
startTime time.Time
}
AliasResolver interface {
ResolveNamespaceAlias(namespace string) string
}
// BucketResolveFunc is a func to resolve bucket info by name.
BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error)
// cidResolveFunc is a func to resolve CID in Stats handler.
cidResolveFunc func(ctx context.Context, reqInfo *ReqInfo) (cnrID string)
)
const systemPath = "/system"
// Metrics wraps http handler for api with basic statistics collection.
func Metrics(log *zap.Logger, resolveBucket BucketResolveFunc, appMetrics *metrics.AppMetrics, aliasResolver AliasResolver) Func {
return func(h http.Handler) http.Handler {
return stats(h.ServeHTTP, resolveCID(log, resolveBucket), appMetrics, aliasResolver)
}
}
// Stats is a handler that update metrics.
func stats(f http.HandlerFunc, resolveCID cidResolveFunc, appMetrics *metrics.AppMetrics, aliasResolver AliasResolver) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
reqInfo := GetReqInfo(r.Context())
appMetrics.Statistic().CurrentS3RequestsInc(reqInfo.API)
defer appMetrics.Statistic().CurrentS3RequestsDec(reqInfo.API)
in := &readCounter{ReadCloser: r.Body}
out := &writeCounter{ResponseWriter: w}
r.Body = in
statsWriter := &responseWrapper{
ResponseWriter: out,
startTime: time.Now(),
}
f(statsWriter, r)
// Time duration in secs since the call started.
// We don't need to do nanosecond precision here
// simply for the fact that it is not human-readable.
durationSecs := time.Since(statsWriter.startTime).Seconds()
user := resolveUser(r.Context())
cnrID := resolveCID(r.Context(), reqInfo)
appMetrics.Update(user, reqInfo.BucketName, cnrID, aliasResolver.ResolveNamespaceAlias(reqInfo.Namespace),
requestTypeFromAPI(reqInfo.API), in.countBytes, out.countBytes)
code := statsWriter.statusCode
// A successful request has a 2xx response code
successReq := code >= http.StatusOK && code < http.StatusMultipleChoices
if !strings.HasSuffix(r.URL.Path, systemPath) {
appMetrics.Statistic().TotalS3RequestsInc(reqInfo.API)
if !successReq && code != 0 {
appMetrics.Statistic().TotalS3ErrorsInc(reqInfo.API)
}
}
if r.Method == http.MethodGet {
// Increment the prometheus http request response histogram with appropriate label
appMetrics.Statistic().RequestDurationsUpdate(reqInfo.API, durationSecs)
}
appMetrics.Statistic().TotalInputBytesAdd(in.countBytes)
appMetrics.Statistic().TotalOutputBytesAdd(out.countBytes)
}
}
func requestTypeFromAPI(api string) metrics.RequestType {
switch api {
case "Options", "HeadObject", "HeadBucket":
return metrics.HEADRequest
case "CreateMultipartUpload", "UploadPartCopy", "UploadPart", "CompleteMultipartUpload",
"PutObjectACL", "PutObjectTagging", "CopyObject", "PutObjectRetention", "PutObjectLegalHold",
"PutObject", "PutBucketCors", "PutBucketACL", "PutBucketLifecycle", "PutBucketEncryption",
"PutBucketPolicy", "PutBucketObjectLockConfig", "PutBucketTagging", "PutBucketVersioning",
"PutBucketNotification", "CreateBucket", "PostObject":
return metrics.PUTRequest
case "ListObjectParts", "ListMultipartUploads", "ListObjectsV2M", "ListObjectsV2", "ListBucketVersions",
"ListObjectsV1", "ListBuckets":
return metrics.LISTRequest
case "GetObjectACL", "GetObjectTagging", "SelectObjectContent", "GetObjectRetention", "getobjectlegalhold",
"GetObjectAttributes", "GetObject", "GetBucketLocation", "GetBucketPolicy",
"GetBucketLifecycle", "GetBucketEncryption", "GetBucketCors", "GetBucketACL",
"GetBucketWebsite", "GetBucketAccelerate", "GetBucketRequestPayment", "GetBucketLogging",
"GetBucketReplication", "GetBucketTagging", "GetBucketObjectLockConfig",
"GetBucketVersioning", "GetBucketNotification", "ListenBucketNotification":
return metrics.GETRequest
case "AbortMultipartUpload", "DeleteObjectTagging", "DeleteObject", "DeleteBucketCors",
"DeleteBucketWebsite", "DeleteBucketTagging", "DeleteMultipleObjects", "DeleteBucketPolicy",
"DeleteBucketLifecycle", "DeleteBucketEncryption", "DeleteBucket":
return metrics.DELETERequest
default:
return metrics.UNKNOWNRequest
}
}
// resolveCID forms CIDResolveFunc using BucketResolveFunc.
func resolveCID(log *zap.Logger, resolveBucket BucketResolveFunc) cidResolveFunc {
return func(ctx context.Context, reqInfo *ReqInfo) (cnrID string) {
if reqInfo.BucketName == "" || reqInfo.API == "CreateBucket" || reqInfo.API == "" {
return ""
}
bktInfo, err := resolveBucket(ctx, reqInfo.BucketName)
if err != nil {
reqLogOrDefault(ctx, log).Debug(logs.FailedToResolveCID, zap.Error(err))
return ""
}
return bktInfo.CID.EncodeToString()
}
}
func resolveUser(ctx context.Context) string {
user := "anon"
if bd, err := GetBoxData(ctx); err == nil && bd.Gate.BearerToken != nil {
user = bearer.ResolveIssuer(*bd.Gate.BearerToken).String()
}
return user
}
// WriteHeader -- writes http status code.
func (w *responseWrapper) WriteHeader(code int) {
w.Do(func() {
w.statusCode = code
w.ResponseWriter.WriteHeader(code)
})
}
// Flush -- calls the underlying Flush.
func (w *responseWrapper) Flush() {
if f, ok := w.ResponseWriter.(http.Flusher); ok {
f.Flush()
}
}
func (w *writeCounter) Flush() {
if f, ok := w.ResponseWriter.(http.Flusher); ok {
f.Flush()
}
}
func (w *writeCounter) Write(p []byte) (int, error) {
n, err := w.ResponseWriter.Write(p)
atomic.AddUint64(&w.countBytes, uint64(n))
return n, err
}
func (r *readCounter) Read(p []byte) (int, error) {
n, err := r.ReadCloser.Read(p)
atomic.AddUint64(&r.countBytes, uint64(n))
return n, err
}