Merge pull request #1 from CHPC-UofU/remove-metrics

Remove metrics
chpc-uofu · Aug 15, 2024 · 6835578 · 6835578
2 parents fcac94d + a9a1b1b
commit 6835578
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diff --git a/README.md b/README.md
@@ -3,12 +3,8 @@
 [![License: GPL v2](https://img.shields.io/badge/License-GPL_v2-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
 
 
-cgroup-warden is a daemon that monitors [cgroups](https://man7.org/linux/man-pages/man7/cgroups.7.html), and provides a way to set resource limits on those cgroups. Created to support CHPC's [Arbiter](https://github.com/chpc-uofu/arbiter), but it may also run stand-alone. 
+cgroup-warden is a daemon that provides a way to set resource limits on those cgroups. Created to support CHPC's [Arbiter](https://github.com/chpc-uofu/arbiter), but it may also run stand-alone. 
 
-## Metrics
-
-cgroup-warden exposes cgroup metrics in the [OpenMetrics](https://openmetrics.io/) format through the `/metrics` endpoint. These metrics are
-provided by the [cgroup_exporter](https://github.com/treydock/cgroup_exporter), with cgroup-warden just wrapping the collector. 
 
 ## Control
 

diff --git a/control.go b/control.go
@@ -7,14 +7,12 @@ import (
  "encoding/json"
  "errors"
  "fmt"
+ "log/slog"
  "net/http"
  "os/user"
  "regexp"
- "strconv"
 
  systemd "github.com/coreos/go-systemd/v22/dbus"
- "github.com/go-kit/log"
- "github.com/go-kit/log/level"
  dbus "github.com/godbus/dbus/v5"
 )
 
@@ -42,134 +40,96 @@ type controlRequest struct {
 }
 
 type controlResponse struct {
- Message string `json:"message"`
- Unit   string `json:"unit,omitempty"`
- Username string `json:"username,omitempty"`
+ Unit string  `json:"unit"`
+ Username string `json:"username"`
+ Property property `json:"property"`
 }
 
-func controlHandler(logger log.Logger) http.HandlerFunc {
+func controlHandler() http.HandlerFunc {
  return func(w http.ResponseWriter, r *http.Request) {
  var err error
  var request controlRequest
  var response controlResponse
 
  err = json.NewDecoder(r.Body).Decode(&request)
  if err != nil {
+ slog.Warn("unable to decode json request", "err", err.Error())
  http.Error(w, err.Error(), http.StatusBadRequest)
  return
  }
 
  response.Unit, response.Username, err = resolveUser(request)
  if err != nil {
+ slog.Warn("unable to resolve user", "err", err.Error(), "request", request)
  http.Error(w, err.Error(), http.StatusBadRequest)
  return
  }
 
- property, err := constructProperty(request.Property)
+ value, err := dbus.ParseVariant(request.Property.Value, dbus.Signature{})
+ property := systemd.Property{Name: request.Property.Name, Value: value}
  if err != nil {
+ slog.Warn("unable to construct property", "err", err.Error(), "request", request)
  http.Error(w, err.Error(), http.StatusBadRequest)
  return
  }
 
  sysconn, err := newSystemdConn()
  if err != nil {
+ slog.Warn("unable to connect to systemd", "err", err.Error())
  http.Error(w, err.Error(), http.StatusInternalServerError)
  return
  }
  defer sysconn.conn.Close()
 
  err = sysconn.conn.SetUnitPropertiesContext(sysconn.ctx, response.Unit, request.Runtime, property)
  if err != nil {
+ slog.Warn("unable to set property", "err", err.Error(), "property", property, "unit", response.Unit)
  http.Error(w, err.Error(), http.StatusInternalServerError)
  return
  }
 
  w.Header().Set("Content-Type", "application/json; charset=utf-8")
  w.Header().Set("X-Content-Type-Options", "nosniff")
  w.WriteHeader(http.StatusOK)
+ response.Property = request.Property
  err = json.NewEncoder(w).Encode(response)
  if err != nil {
- level.Error(logger).Log("msg", "error sending response", "err", err)
+ slog.Error("unable to send encode response", "error", err.Error())
  }
  }
 }
 
-func constructProperty(candidate property) (systemd.Property, error) {
- var value any
- var err error
- var property systemd.Property
- switch candidate.Name {
- case "MemoryMax":
- value, err = strconv.ParseFloat(candidate.Value, 64)
- case "CPUQuotaPerSecUSec":
- value, err = strconv.ParseFloat(candidate.Value, 64)
- case "MemoryAccounting":
- value, err = strconv.ParseBool(candidate.Value)
- case "CPUAccounting":
- value, err = strconv.ParseBool(candidate.Value)
- default:
- value, err = nil, fmt.Errorf("%v is not a valid property", candidate.Name)
- }
-
- if err != nil {
- return property, err
- }
+func resolveUser(request controlRequest) (string, string, error) {
 
- property.Value = dbus.MakeVariant(value)
- property.Name = candidate.Name
- return property, err
-}
+ var unit string
+ var username string
+ var err error
 
-func resolveUser(request controlRequest) (username string, unit string, err error) {
- if request.Unit != nil && request.Username != nil {
- username, err = resolveUsername(*request.Unit)
- if err != nil {
- return
- }
- unit, err = resolveUnit(*request.Unit)
- if err != nil {
- return
- }
- if username != *request.Username || unit != *request.Unit {
- err = errors.New("unit and username do not match")
- return
- }
- }
  if request.Unit != nil {
- username, err = resolveUsername(*request.Unit)
- unit = *request.Unit
- return
+ username, err = getUsername(*request.Unit)
+ return *request.Unit, username, err
  }
+
  if request.Username != nil {
- unit, err = resolveUnit(*request.Username)
- username = *request.Username
- return
+ unit, err := getUnit(*request.Username)
+ return unit, *request.Username, err
  }
- err = errors.New("must provide unit or username")
- return
+
+ return unit, username, errors.New("must provide unit or username")
 }
 
-func resolveUsername(unit string) (username string, err error) {
+func getUsername(unit string) (string, error) {
  re := regexp.MustCompile(`user-(\d+)\.slice`)
  match := re.FindStringSubmatch(unit)
- var usr *user.User
  if len(match) != 2 {
- err = errors.New("invalid unit")
- return
+ return "", errors.New("invalid unit string")
  }
- usr, err = user.LookupId(match[1])
- if err != nil {
- return
- }
- return usr.Username, nil
+ usr, err := user.LookupId(match[1])
+ return usr.Username, err
 }
 
-func resolveUnit(username string) (unit string, err error) {
- var usr *user.User
- usr, err = user.Lookup(username)
- if err != nil {
- return
- }
- unit = fmt.Sprintf("user-%v.slice", usr.Uid)
- return
+func getUnit(username string) (string, error) {
+ usr, err := user.Lookup(username)
+ unit := fmt.Sprintf("user-%v.slice", usr.Uid)
+ return unit, err
 }
diff --git a/control_test.go b/control_test.go
@@ -0,0 +1,44 @@
+package main
+
+import "testing"
+
+func TestResolveUser(t *testing.T) {
+ var prop property
+ unit := "user-0.slice"
+ username := "root"
+ testCases := []controlRequest{
+ {Unit: &unit, Username: nil, Property: prop, Runtime: false},
+ {Unit: nil, Username: &username, Property: prop, Runtime: false},
+ {Unit: &unit, Username: &username, Property: prop, Runtime: false},
+ }
+
+ for _, tc := range testCases {
+ slice, name, err := resolveUser(tc)
+ if err != nil || slice != unit || name != username {
+ t.Fail()
+ }
+ }
+
+ badRequest := controlRequest{Unit: nil, Username: nil, Property: prop, Runtime: false}
+ _, _, err := resolveUser(badRequest)
+ if err == nil {
+ t.Fail()
+ }
+
+}
+
+func TestGetUsername(t *testing.T) {
+ unit := "user-0.slice"
+ username, err := getUsername(unit)
+ if err != nil || username != "root" {
+ t.Fail()
+ }
+}
+
+func TestGetUnit(t *testing.T) {
+ username := "root"
+ unit, err := getUnit(username)
+ if err != nil || unit != "user-0.slice" {
+ t.Fail()
+ }
+}
diff --git a/go.mod b/go.mod
@@ -5,35 +5,6 @@ go 1.22
 toolchain go1.22.5
 
 require (
- github.com/alecthomas/kingpin/v2 v2.4.0
- github.com/containerd/cgroups v1.1.0
  github.com/coreos/go-systemd/v22 v22.5.0
- github.com/go-kit/log v0.2.1
  github.com/godbus/dbus/v5 v5.1.0
- github.com/prometheus/client_golang v1.19.1
- github.com/prometheus/common v0.53.0
- github.com/treydock/cgroup_exporter v0.9.1
 )
-
-require (
- github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9 // indirect
- github.com/beorn7/perks v1.0.1 // indirect
- github.com/cespare/xxhash/v2 v2.3.0 // indirect
- github.com/cilium/ebpf v0.15.0 // indirect
- github.com/containerd/cgroups/v3 v3.0.3 // indirect
- github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
- github.com/docker/go-units v0.5.0 // indirect
- github.com/go-logfmt/logfmt v0.6.0 // indirect
- github.com/gogo/protobuf v1.3.2 // indirect
- github.com/opencontainers/runtime-spec v1.2.0 // indirect
- github.com/prometheus/client_model v0.6.1 // indirect
- github.com/prometheus/procfs v0.15.0 // indirect
- github.com/sirupsen/logrus v1.9.3 // indirect
- github.com/xhit/go-str2duration/v2 v2.1.0 // indirect
- golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
- golang.org/x/sys v0.20.0 // indirect
- google.golang.org/protobuf v1.34.1 // indirect
-)
-
-// supports cgroups v2
-replace github.com/treydock/cgroup_exporter => github.com/treydock/cgroup_exporter v1.0.0-rc.4
diff --git a/go.sum b/go.sum
@@ -1,109 +1,5 @@
-github.com/alecthomas/kingpin/v2 v2.4.0 h1:f48lwail6p8zpO1bC4TxtqACaGqHYA22qkHjHpqDjYY=
-github.com/alecthomas/kingpin/v2 v2.4.0/go.mod h1:0gyi0zQnjuFk8xrkNKamJoyUo382HRL7ATRpFZCw6tE=
-github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9 h1:ez/4by2iGztzR4L0zgAOR8lTQK9VlyBVVd7G4omaOQs=
-github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
-github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
-github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
-github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cilium/ebpf v0.15.0 h1:7NxJhNiBT3NG8pZJ3c+yfrVdHY8ScgKD27sScgjLMMk=
-github.com/cilium/ebpf v0.15.0/go.mod h1:DHp1WyrLeiBh19Cf/tfiSMhqheEiK8fXFZ4No0P1Hso=
-github.com/containerd/cgroups v1.1.0 h1:v8rEWFl6EoqHB+swVNjVoCJE8o3jX7e8nqBGPLaDFBM=
-github.com/containerd/cgroups v1.1.0/go.mod h1:6ppBcbh/NOOUU+dMKrykgaBnK9lCIBxHqJDGwsa1mIw=
-github.com/containerd/cgroups/v3 v3.0.3 h1:S5ByHZ/h9PMe5IOQoN7E+nMc2UcLEM/V48DGDJ9kip0=
-github.com/containerd/cgroups/v3 v3.0.3/go.mod h1:8HBe7V3aWGLFPd/k03swSIsGjZhHI2WzJmticMgVuz0=
 github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
-github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
-github.com/go-kit/log v0.2.1 h1:MRVx0/zhvdseW+Gza6N9rVzU/IVzaeE1SFI4raAhmBU=
-github.com/go-kit/log v0.2.1/go.mod h1:NwTd00d/i8cPZ3xOwwiv2PO5MOcx78fFErGNcVmBjv0=
-github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
-github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
-github.com/go-quicktest/qt v1.101.0 h1:O1K29Txy5P2OK0dGo59b7b0LR6wKfIhttaAhHUyn7eI=
-github.com/go-quicktest/qt v1.101.0/go.mod h1:14Bz/f7NwaXPtdYEgzsx46kqSxVwTbzVZsDC26tQJow=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
 github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
-github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
-github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/opencontainers/runtime-spec v1.2.0 h1:z97+pHb3uELt/yiAWD691HNHQIF07bE7dzrbT927iTk=
-github.com/opencontainers/runtime-spec v1.2.0/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
-github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
-github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
-github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
-github.com/prometheus/common v0.53.0 h1:U2pL9w9nmJwJDa4qqLQ3ZaePJ6ZTwt7cMD3AG3+aLCE=
-github.com/prometheus/common v0.53.0/go.mod h1:BrxBKv3FWBIGXw89Mg1AeBq7FSyRzXWI3l3e7W3RN5U=
-github.com/prometheus/procfs v0.15.0 h1:A82kmvXJq2jTu5YUhSGNlYoxh85zLnKgPz4bMZgI5Ek=
-github.com/prometheus/procfs v0.15.0/go.mod h1:Y0RJ/Y5g5wJpkTisOtqwDSo4HwhGmLB4VQSw2sQJLHk=
-github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
-github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
-github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
-github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
-github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/treydock/cgroup_exporter v1.0.0-rc.4 h1:syobRLC5dTKgAL/cPcv2QnsALrOYSWppymgylDZWehg=
-github.com/treydock/cgroup_exporter v1.0.0-rc.4/go.mod h1:eFVfMSWmqAp3qeGTWj1WFzMH2zSIoRMl1RsmWfxQCYg=
-github.com/xhit/go-str2duration/v2 v2.1.0 h1:lxklc02Drh6ynqX+DdPyp5pCKLUQpRT8bp8Ydu2Bstc=
-github.com/xhit/go-str2duration/v2 v2.1.0/go.mod h1:ohY8p+0f07DiV6Em5LKB0s2YpLtXVyJfNt1+BlmyAsU=
-github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-go.uber.org/goleak v1.1.12 h1:gZAh5/EyT/HQwlpkCy6wTpqfH9H8Lz8zbm3dZh+OyzA=
-go.uber.org/goleak v1.1.12/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
-golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842/go.mod h1:XtvwrStGgqGPLc4cjQfWqZHG1YFdYs6swckp8vpsjnc=
-golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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