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rules: remove dependency on promql.Engine

This commit is contained in:
Fabian Reinartz 2017-11-23 13:04:54 +01:00
parent f8fccc73d8
commit 2d0e3746ac
9 changed files with 219 additions and 164 deletions
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5
cmd/prometheus/main.go
View File

@ -96,6 +96,9 @@ func main() {
notifier: notifier.Options{
Registerer: prometheus.DefaultRegisterer,
},
queryEngine: promql.EngineOptions{
Metrics: prometheus.DefaultRegisterer,
},
}
a := kingpin.New(filepath.Base(os.Args[0]), "The Prometheus monitoring server")
@ -234,7 +237,7 @@ func main() {
ruleManager := rules.NewManager(&rules.ManagerOptions{
Appendable: fanoutStorage,
Notifier: notifier,
QueryEngine: queryEngine,
Query: rules.EngineQueryFunc(queryEngine),
Context: ctx,
ExternalURL: cfg.web.ExternalURL,
Logger: log.With(logger, "component", "rule manager"),

10
rules/alerting.go
View File

@ -171,12 +171,8 @@ const resolvedRetention = 15 * time.Minute
// Eval evaluates the rule expression and then creates pending alerts and fires
// or removes previously pending alerts accordingly.
func (r *AlertingRule) Eval(ctx context.Context, ts time.Time, engine *promql.Engine, externalURL *url.URL) (promql.Vector, error) {
query, err := engine.NewInstantQuery(r.vector.String(), ts)
if err != nil {
return nil, err
}
res, err := query.Exec(ctx).Vector()
func (r *AlertingRule) Eval(ctx context.Context, ts time.Time, query QueryFunc, externalURL *url.URL) (promql.Vector, error) {
res, err := query(ctx, r.vector.String(), ts)
if err != nil {
return nil, err
}
@ -213,7 +209,7 @@ func (r *AlertingRule) Eval(ctx context.Context, ts time.Time, engine *promql.En
"__alert_"+r.Name(),
tmplData,
model.Time(timestamp.FromTime(ts)),
engine,
template.QueryFunc(query),
externalURL,
)
result, err := tmpl.Expand()

37
rules/manager.go
View File

@ -107,12 +107,42 @@ const (
ruleTypeRecording = "recording"
)
// QueryFunc processes PromQL queries.
type QueryFunc func(ctx context.Context, q string, t time.Time) (promql.Vector, error)
// EngineQueryFunc returns a new query function that executes instant queries against
// the given engine.
// It converts scaler into vector results.
func EngineQueryFunc(engine *promql.Engine) QueryFunc {
return func(ctx context.Context, qs string, t time.Time) (promql.Vector, error) {
q, err := engine.NewInstantQuery(qs, t)
if err != nil {
return nil, err
}
res := q.Exec(ctx)
if res.Err != nil {
return nil, res.Err
}
switch v := res.Value.(type) {
case promql.Vector:
return v, nil
case promql.Scalar:
return promql.Vector{promql.Sample{
Point: promql.Point(v),
Metric: labels.Labels{},
}}, nil
default:
return nil, fmt.Errorf("rule result is not a vector or scalar")
}
}
}
// A Rule encapsulates a vector expression which is evaluated at a specified
// interval and acted upon (currently either recorded or used for alerting).
type Rule interface {
Name() string
// eval evaluates the rule, including any associated recording or alerting actions.
Eval(context.Context, time.Time, *promql.Engine, *url.URL) (promql.Vector, error)
Eval(context.Context, time.Time, QueryFunc, *url.URL) (promql.Vector, error)
// String returns a human-readable string representation of the rule.
String() string
@ -220,7 +250,6 @@ func (g *Group) hash() uint64 {
labels.Label{"name", g.name},
labels.Label{"file", g.file},
)
return l.Hash()
}
@ -319,7 +348,7 @@ func (g *Group) Eval(ts time.Time) {
evalTotal.WithLabelValues(rtyp).Inc()
vector, err := rule.Eval(g.opts.Context, ts, g.opts.QueryEngine, g.opts.ExternalURL)
vector, err := rule.Eval(g.opts.Context, ts, g.opts.Query, g.opts.ExternalURL)
if err != nil {
// Canceled queries are intentional termination of queries. This normally
// happens on shutdown and thus we skip logging of any errors here.
@ -439,7 +468,7 @@ type Appendable interface {
// ManagerOptions bundles options for the Manager.
type ManagerOptions struct {
ExternalURL *url.URL
QueryEngine *promql.Engine
Query QueryFunc
Context context.Context
Notifier *notifier.Notifier
Appendable Appendable

109
rules/manager_test.go
View File

@ -17,7 +17,7 @@ import (
"context"
"fmt"
"math"
"strings"
"sort"
"testing"
"time"
@ -55,75 +55,108 @@ func TestAlertingRule(t *testing.T) {
labels.FromStrings("severity", "{{\"c\"}}ritical"),
nil, nil,
)
result := promql.Vector{
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "pending",
"group", "canary",
"instance", "0",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "pending",
"group", "canary",
"instance", "1",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "firing",
"group", "canary",
"instance", "0",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
{
Metric: labels.FromStrings(
"__name__", "ALERTS",
"alertname", "HTTPRequestRateLow",
"alertstate", "firing",
"group", "canary",
"instance", "1",
"job", "app-server",
"severity", "critical",
),
Point: promql.Point{V: 1},
},
}
baseTime := time.Unix(0, 0)
var tests = []struct {
time time.Duration
result []string
result promql.Vector
}{
{
time: 0,
result: []string{
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="pending", group="canary", instance="0", job="app-server", severity="critical"} => 1 @[%v]`,
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="pending", group="canary", instance="1", job="app-server", severity="critical"} => 1 @[%v]`,
},
result: result[:2],
}, {
time: 5 * time.Minute,
result: []string{
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="firing", group="canary", instance="0", job="app-server", severity="critical"} => 1 @[%v]`,
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="firing", group="canary", instance="1", job="app-server", severity="critical"} => 1 @[%v]`,
},
result: result[2:],
}, {
time: 10 * time.Minute,
result: []string{
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="firing", group="canary", instance="0", job="app-server", severity="critical"} => 1 @[%v]`,
},
result: result[2:3],
},
{
time: 15 * time.Minute,
result: []string{},
result: nil,
},
{
time: 20 * time.Minute,
result: []string{},
result: nil,
},
{
time: 25 * time.Minute,
result: []string{
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="pending", group="canary", instance="0", job="app-server", severity="critical"} => 1 @[%v]`,
},
result: result[:1],
},
{
time: 30 * time.Minute,
result: []string{
`{__name__="ALERTS", alertname="HTTPRequestRateLow", alertstate="firing", group="canary", instance="0", job="app-server", severity="critical"} => 1 @[%v]`,
},
result: result[2:3],
},
}
for i, test := range tests {
t.Logf("case %d", i)
evalTime := baseTime.Add(test.time)
res, err := rule.Eval(suite.Context(), evalTime, suite.QueryEngine(), nil)
res, err := rule.Eval(suite.Context(), evalTime, EngineQueryFunc(suite.QueryEngine()), nil)
testutil.Ok(t, err)
actual := strings.Split(res.String(), "\n")
expected := annotateWithTime(test.result, evalTime)
if actual[0] == "" {
actual = []string{}
for i := range test.result {
test.result[i].T = timestamp.FromTime(evalTime)
}
testutil.Assert(t, len(expected) == len(actual), "%d. Number of samples in expected and actual output don't match (%d vs. %d)", i, len(expected), len(actual))
testutil.Assert(t, len(test.result) == len(res), "%d. Number of samples in expected and actual output don't match (%d vs. %d)", i, len(test.result), len(res))
for j, expectedSample := range expected {
found := false
for _, actualSample := range actual {
if actualSample == expectedSample {
found = true
}
}
testutil.Assert(t, found, "%d.%d. Couldn't find expected sample in output: '%v'", i, j, expectedSample)
}
sort.Slice(res, func(i, j int) bool {
return labels.Compare(res[i].Metric, res[j].Metric) < 0
})
testutil.Equals(t, test.result, res)
for _, aa := range rule.ActiveAlerts() {
testutil.Assert(t, aa.Labels.Get(model.MetricNameLabel) == "", "%s label set on active alert: %s", model.MetricNameLabel, aa.Labels)
@ -144,7 +177,7 @@ func TestStaleness(t *testing.T) {
defer storage.Close()
engine := promql.NewEngine(storage, nil)
opts := &ManagerOptions{
QueryEngine: engine,
Query: EngineQueryFunc(engine),
Appendable: storage,
Context: context.Background(),
Logger: log.NewNopLogger(),
@ -273,7 +306,7 @@ func TestApplyConfig(t *testing.T) {
ruleManager := NewManager(&ManagerOptions{
Appendable: nil,
Notifier: nil,
QueryEngine: nil,
Query: nil,
Context: context.Background(),
Logger: log.NewNopLogger(),
})

25
rules/recording.go
View File

@ -53,32 +53,11 @@ func (rule *RecordingRule) Name() string {
}
// Eval evaluates the rule and then overrides the metric names and labels accordingly.
func (rule *RecordingRule) Eval(ctx context.Context, ts time.Time, engine *promql.Engine, _ *url.URL) (promql.Vector, error) {
query, err := engine.NewInstantQuery(rule.vector.String(), ts)
func (rule *RecordingRule) Eval(ctx context.Context, ts time.Time, query QueryFunc, _ *url.URL) (promql.Vector, error) {
vector, err := query(ctx, rule.vector.String(), ts)
if err != nil {
return nil, err
}
var (
result = query.Exec(ctx)
vector promql.Vector
)
if result.Err != nil {
return nil, err
}
switch v := result.Value.(type) {
case promql.Vector:
vector = v
case promql.Scalar:
vector = promql.Vector{promql.Sample{
Point: promql.Point(v),
Metric: labels.Labels{},
}}
default:
return nil, fmt.Errorf("rule result is not a vector or scalar")
}
// Override the metric name and labels.
for i := range vector {
sample := &vector[i]

2
rules/recording_test.go
View File

@ -62,7 +62,7 @@ func TestRuleEval(t *testing.T) {
for _, test := range suite {
rule := NewRecordingRule(test.name, test.expr, test.labels)
result, err := rule.Eval(ctx, now, engine, nil)
result, err := rule.Eval(ctx, now, EngineQueryFunc(engine), nil)
testutil.Ok(t, err)
testutil.Equals(t, result, test.result)
}

43
template/template.go
View File

@ -30,7 +30,6 @@ import (
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/strutil"
)
@ -59,34 +58,14 @@ func (q queryResultByLabelSorter) Swap(i, j int) {
q.results[i], q.results[j] = q.results[j], q.results[i]
}
func query(ctx context.Context, q string, ts time.Time, queryEngine *promql.Engine) (queryResult, error) {
query, err := queryEngine.NewInstantQuery(q, ts)
// QueryFunc executes a PromQL query at the given time.
type QueryFunc func(context.Context, string, time.Time) (promql.Vector, error)
func query(ctx context.Context, q string, ts time.Time, queryFn QueryFunc) (queryResult, error) {
vector, err := queryFn(ctx, q, ts)
if err != nil {
return nil, err
}
res := query.Exec(ctx)
if res.Err != nil {
return nil, res.Err
}
var vector promql.Vector
switch v := res.Value.(type) {
case promql.Matrix:
return nil, errors.New("matrix return values not supported")
case promql.Vector:
vector = v
case promql.Scalar:
vector = promql.Vector{promql.Sample{
Point: promql.Point(v),
}}
case promql.String:
vector = promql.Vector{promql.Sample{
Metric: labels.FromStrings("__value__", v.V),
Point: promql.Point{T: v.T},
}}
default:
panic("template.query: unhandled result value type")
}
// promql.Vector is hard to work with in templates, so convert to
// base data types.
@ -111,14 +90,22 @@ type Expander struct {
}
// NewTemplateExpander returns a template expander ready to use.
func NewTemplateExpander(ctx context.Context, text string, name string, data interface{}, timestamp model.Time, queryEngine *promql.Engine, externalURL *url.URL) *Expander {
func NewTemplateExpander(
ctx context.Context,
text string,
name string,
data interface{},
timestamp model.Time,
queryFunc QueryFunc,
externalURL *url.URL,
) *Expander {
return &Expander{
text: text,
name: name,
data: data,
funcMap: text_template.FuncMap{
"query": func(q string) (queryResult, error) {
return query(ctx, q, timestamp.Time(), queryEngine)
return query(ctx, q, timestamp.Time(), queryFunc)
},
"first": func(v queryResult) (*sample, error) {
if len(v) > 0 {

74
template/template_test.go
View File

@ -18,19 +18,17 @@ import (
"math"
"net/url"
"testing"
"github.com/prometheus/common/model"
"github.com/stretchr/testify/require"
"time"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/testutil"
)
type testTemplatesScenario struct {
text string
output string
input interface{}
queryResult promql.Vector
shouldFail bool
html bool
}
@ -72,40 +70,70 @@ func TestTemplateExpansion(t *testing.T) {
{
text: "{{ query \"1.5\" | first | value }}",
output: "1.5",
},
{
// Get value from scalar query.
text: "{{ query \"scalar(count(metric))\" | first | value }}",
output: "2",
queryResult: promql.Vector{{Point: promql.Point{T: 0, V: 1.5}}},
},
{
// Get value from query.
text: "{{ query \"metric{instance='a'}\" | first | value }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "11",
},
{
// Get label from query.
text: "{{ query \"metric{instance='a'}\" | first | label \"instance\" }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "a",
},
{
// Missing label is empty when using label function.
text: "{{ query \"metric{instance='a'}\" | first | label \"foo\" }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
},
{
// Missing label is empty when not using label function.
text: "{{ $x := query \"metric\" | first }}{{ $x.Labels.foo }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
},
{
text: "{{ $x := query \"metric\" | first }}{{ $x.Labels.foo }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
html: true,
},
{
// Range over query and sort by label.
text: "{{ range query \"metric\" | sortByLabel \"instance\" }}{{.Labels.instance}}:{{.Value}}: {{end}}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}, {
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "b"),
Point: promql.Point{T: 0, V: 21},
}},
output: "a:11: b:21: ",
},
{
@ -116,11 +144,13 @@ func TestTemplateExpansion(t *testing.T) {
{
// Error in function.
text: "{{ query \"missing\" | first }}",
queryResult: promql.Vector{},
shouldFail: true,
},
{
// Panic.
text: "{{ (query \"missing\").banana }}",
queryResult: promql.Vector{},
shouldFail: true,
},
{
@ -211,36 +241,18 @@ func TestTemplateExpansion(t *testing.T) {
},
}
time := model.Time(0)
storage := testutil.NewStorage(t)
defer storage.Close()
app, err := storage.Appender()
if err != nil {
t.Fatalf("get appender: %s", err)
}
_, err = app.Add(labels.FromStrings(labels.MetricName, "metric", "instance", "a"), 0, 11)
require.NoError(t, err)
_, err = app.Add(labels.FromStrings(labels.MetricName, "metric", "instance", "b"), 0, 21)
require.NoError(t, err)
if err := app.Commit(); err != nil {
t.Fatalf("commit samples: %s", err)
}
engine := promql.NewEngine(storage, nil)
extURL, err := url.Parse("http://testhost:9090/path/prefix")
if err != nil {
panic(err)
}
for i, s := range scenarios {
queryFunc := func(_ context.Context, _ string, _ time.Time) (promql.Vector, error) {
return s.queryResult, nil
}
var result string
var err error
expander := NewTemplateExpander(context.Background(), s.text, "test", s.input, time, engine, extURL)
expander := NewTemplateExpander(context.Background(), s.text, "test", s.input, 0, queryFunc, extURL)
if s.html {
result, err = expander.ExpandHTML(nil)
} else {

20
web/web.go
View File

@ -527,7 +527,15 @@ func (h *Handler) consoles(w http.ResponseWriter, r *http.Request) {
Path: strings.TrimLeft(name, "/"),
}
tmpl := template.NewTemplateExpander(h.context, string(text), "__console_"+name, data, h.now(), h.queryEngine, h.options.ExternalURL)
tmpl := template.NewTemplateExpander(
h.context,
string(text),
"__console_"+name,
data,
h.now(),
template.QueryFunc(rules.EngineQueryFunc(h.queryEngine)),
h.options.ExternalURL,
)
filenames, err := filepath.Glob(h.options.ConsoleLibrariesPath + "/*.lib")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
@ -732,7 +740,15 @@ func (h *Handler) executeTemplate(w http.ResponseWriter, name string, data inter
http.Error(w, err.Error(), http.StatusInternalServerError)
}
tmpl := template.NewTemplateExpander(h.context, text, name, data, h.now(), h.queryEngine, h.options.ExternalURL)
tmpl := template.NewTemplateExpander(
h.context,
text,
name,
data,
h.now(),
template.QueryFunc(rules.EngineQueryFunc(h.queryEngine)),
h.options.ExternalURL,
)
tmpl.Funcs(tmplFuncs(h.consolesPath(), h.options))
result, err := tmpl.ExpandHTML(nil)