2411: Add copyright notices to everything.

[arvados.git] / services / ws / permission.go

diff --git a/services/ws/permission.go b/services/ws/permission.go
index 3f16a89cc63bd02cd12beab8624adbca8d7da59f..b40c1fa1863219048a2ba70f8b2afb1ffc394391 100644 (file)
--- a/services/ws/permission.go
+++ b/services/ws/permission.go
@@ -1,3 +1,7 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
@@ -18,7 +22,7 @@ type permChecker interface {
        Check(uuid string) (bool, error)
 }
 
-func NewPermChecker(ac arvados.Client) permChecker {
+func newPermChecker(ac arvados.Client) permChecker {
        ac.AuthToken = ""
        return &cachingPermChecker{
                Client:     &ac,
@@ -36,24 +40,39 @@ type cachingPermChecker struct {
        *arvados.Client
        cache      map[string]cacheEnt
        maxCurrent int
+
+       nChecks  uint64
+       nMisses  uint64
+       nInvalid uint64
 }
 
 func (pc *cachingPermChecker) SetToken(token string) {
+       if pc.Client.AuthToken == token {
+               return
+       }
        pc.Client.AuthToken = token
+       pc.cache = make(map[string]cacheEnt)
 }
 
 func (pc *cachingPermChecker) Check(uuid string) (bool, error) {
+       pc.nChecks++
+       logger := logger(nil).
+               WithField("token", pc.Client.AuthToken).
+               WithField("uuid", uuid)
        pc.tidy()
        now := time.Now()
        if perm, ok := pc.cache[uuid]; ok && now.Sub(perm.Time) < maxPermCacheAge {
-               debugLogf("perm (cached): %+q %+q => %s", pc.Client.AuthToken, uuid, perm.allowed)
+               logger.WithField("allowed", perm.allowed).Debug("cache hit")
                return perm.allowed, nil
        }
        var buf map[string]interface{}
        path, err := pc.PathForUUID("get", uuid)
        if err != nil {
+               pc.nInvalid++
                return false, err
        }
+
+       pc.nMisses++
        err = pc.RequestAndDecode(&buf, "GET", path, nil, url.Values{
                "select": {`["uuid"]`},
        })
@@ -61,17 +80,26 @@ func (pc *cachingPermChecker) Check(uuid string) (bool, error) {
        var allowed bool
        if err == nil {
                allowed = true
-       } else if txErr, ok := err.(arvados.TransactionError); ok && txErr.StatusCode == http.StatusNotFound {
+       } else if txErr, ok := err.(*arvados.TransactionError); ok && pc.isNotAllowed(txErr.StatusCode) {
                allowed = false
        } else {
-               errorLogf("perm err: %+q %+q: %s", pc.Client.AuthToken, uuid, err)
+               logger.WithError(err).Error("lookup error")
                return false, err
        }
-       debugLogf("perm: %+q %+q => %s", pc.Client.AuthToken, uuid, allowed)
+       logger.WithField("allowed", allowed).Debug("cache miss")
        pc.cache[uuid] = cacheEnt{Time: now, allowed: allowed}
        return allowed, nil
 }
 
+func (pc *cachingPermChecker) isNotAllowed(status int) bool {
+       switch status {
+       case http.StatusForbidden, http.StatusUnauthorized, http.StatusNotFound:
+               return true
+       default:
+               return false
+       }
+}
+
 func (pc *cachingPermChecker) tidy() {
        if len(pc.cache) <= pc.maxCurrent*2 {
                return