mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-16 10:34:06 -08:00
5b53aa1108
Wiser coders than myself have come to the conclusion that a `switch` statement is almost always superior to a statement that includes any `else if`. The exceptions that I have found in our codebase are just these two: * The `if else` is followed by an additional statement before the next condition (separated by a `;`). * The whole thing is within a `for` loop and `break` statements are used. In this case, using `switch` would require tagging the `for` loop, which probably tips the balance. Why are `switch` statements more readable? For one, fewer curly braces. But more importantly, the conditions all have the same alignment, so the whole thing follows the natural flow of going down a list of conditions. With `else if`, in contrast, all conditions but the first are "hidden" behind `} else if `, harder to spot and (for no good reason) presented differently from the first condition. I'm sure the aforemention wise coders can list even more reasons. In any case, I like it so much that I have found myself recommending it in code reviews. I would like to make it a habit in our code base, without making it a hard requirement that we would test on the CI. But for that, there has to be a role model, so this commit eliminates all `if else` occurrences, unless it is autogenerated code or fits one of the exceptions above. Signed-off-by: beorn7 <beorn@grafana.com>
420 lines
12 KiB
Go
420 lines
12 KiB
Go
// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"net/http"
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"net/http/httptest"
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"sort"
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"strings"
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"testing"
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"time"
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"github.com/pkg/errors"
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"github.com/prometheus/common/model"
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"github.com/stretchr/testify/require"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/model/histogram"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/textparse"
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"github.com/prometheus/prometheus/promql"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/tsdb"
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)
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var scenarios = map[string]struct {
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params string
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externalLabels labels.Labels
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code int
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body string
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}{
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"empty": {
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params: "",
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code: 200,
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body: ``,
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},
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"match nothing": {
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params: "match[]=does_not_match_anything",
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code: 200,
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body: ``,
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},
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"invalid params from the beginning": {
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params: "match[]=-not-a-valid-metric-name",
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code: 400,
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body: `1:1: parse error: unexpected <op:->
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`,
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},
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"invalid params somewhere in the middle": {
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params: "match[]=not-a-valid-metric-name",
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code: 400,
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body: `1:4: parse error: unexpected <op:->
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`,
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},
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"test_metric1": {
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params: "match[]=test_metric1",
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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`,
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},
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"test_metric2": {
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params: "match[]=test_metric2",
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code: 200,
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body: `# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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`,
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},
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"test_metric_without_labels": {
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params: "match[]=test_metric_without_labels",
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code: 200,
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body: `# TYPE test_metric_without_labels untyped
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test_metric_without_labels{instance=""} 1001 6000000
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`,
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},
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"test_stale_metric": {
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params: "match[]=test_metric_stale",
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code: 200,
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body: ``,
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},
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"test_old_metric": {
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params: "match[]=test_metric_old",
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code: 200,
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body: `# TYPE test_metric_old untyped
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test_metric_old{instance=""} 981 5880000
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`,
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},
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"{foo='boo'}": {
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params: "match[]={foo='boo'}",
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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`,
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},
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"two matchers": {
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params: "match[]=test_metric1&match[]=test_metric2",
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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`,
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},
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"two matchers with overlap": {
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params: "match[]={__name__=~'test_metric1'}&match[]={foo='bar'}",
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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`,
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},
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"everything": {
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params: "match[]={__name__=~'.%2b'}", // '%2b' is an URL-encoded '+'.
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric_old untyped
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test_metric_old{instance=""} 981 5880000
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# TYPE test_metric_without_labels untyped
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test_metric_without_labels{instance=""} 1001 6000000
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`,
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},
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"empty label value matches everything that doesn't have that label": {
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params: "match[]={foo='',__name__=~'.%2b'}",
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code: 200,
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body: `# TYPE test_metric_old untyped
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test_metric_old{instance=""} 981 5880000
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# TYPE test_metric_without_labels untyped
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test_metric_without_labels{instance=""} 1001 6000000
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`,
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},
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"empty label value for a label that doesn't exist at all, matches everything": {
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params: "match[]={bar='',__name__=~'.%2b'}",
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric_old untyped
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test_metric_old{instance=""} 981 5880000
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# TYPE test_metric_without_labels untyped
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test_metric_without_labels{instance=""} 1001 6000000
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`,
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},
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"external labels are added if not already present": {
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params: "match[]={__name__=~'.%2b'}", // '%2b' is an URL-encoded '+'.
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externalLabels: labels.FromStrings("foo", "baz", "zone", "ie"),
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i",zone="ie"} 10000 6000000
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test_metric1{foo="boo",instance="i",zone="ie"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i",zone="ie"} 1 6000000
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# TYPE test_metric_old untyped
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test_metric_old{foo="baz",instance="",zone="ie"} 981 5880000
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# TYPE test_metric_without_labels untyped
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test_metric_without_labels{foo="baz",instance="",zone="ie"} 1001 6000000
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`,
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},
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"instance is an external label": {
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// This makes no sense as a configuration, but we should
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// know what it does anyway.
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params: "match[]={__name__=~'.%2b'}", // '%2b' is an URL-encoded '+'.
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externalLabels: labels.FromStrings("instance", "baz"),
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code: 200,
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body: `# TYPE test_metric1 untyped
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test_metric1{foo="bar",instance="i"} 10000 6000000
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test_metric1{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric2 untyped
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test_metric2{foo="boo",instance="i"} 1 6000000
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# TYPE test_metric_old untyped
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test_metric_old{instance="baz"} 981 5880000
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# TYPE test_metric_without_labels untyped
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test_metric_without_labels{instance="baz"} 1001 6000000
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`,
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},
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}
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func TestFederation(t *testing.T) {
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suite, err := promql.NewTest(t, `
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load 1m
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test_metric1{foo="bar",instance="i"} 0+100x100
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test_metric1{foo="boo",instance="i"} 1+0x100
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test_metric2{foo="boo",instance="i"} 1+0x100
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test_metric_without_labels 1+10x100
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test_metric_stale 1+10x99 stale
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test_metric_old 1+10x98
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`)
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if err != nil {
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t.Fatal(err)
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}
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defer suite.Close()
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if err := suite.Run(); err != nil {
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t.Fatal(err)
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}
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h := &Handler{
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localStorage: &dbAdapter{suite.TSDB()},
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lookbackDelta: 5 * time.Minute,
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now: func() model.Time { return 101 * 60 * 1000 }, // 101min after epoch.
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config: &config.Config{
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GlobalConfig: config.GlobalConfig{},
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},
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}
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for name, scenario := range scenarios {
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t.Run(name, func(t *testing.T) {
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h.config.GlobalConfig.ExternalLabels = scenario.externalLabels
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req := httptest.NewRequest("GET", "http://example.org/federate?"+scenario.params, nil)
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res := httptest.NewRecorder()
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h.federation(res, req)
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require.Equal(t, scenario.code, res.Code)
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require.Equal(t, scenario.body, normalizeBody(res.Body))
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})
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}
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}
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type notReadyReadStorage struct {
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LocalStorage
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}
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func (notReadyReadStorage) Querier(context.Context, int64, int64) (storage.Querier, error) {
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return nil, errors.Wrap(tsdb.ErrNotReady, "wrap")
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}
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func (notReadyReadStorage) StartTime() (int64, error) {
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return 0, errors.Wrap(tsdb.ErrNotReady, "wrap")
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}
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func (notReadyReadStorage) Stats(string) (*tsdb.Stats, error) {
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return nil, errors.Wrap(tsdb.ErrNotReady, "wrap")
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}
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// Regression test for https://github.com/prometheus/prometheus/issues/7181.
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func TestFederation_NotReady(t *testing.T) {
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for name, scenario := range scenarios {
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t.Run(name, func(t *testing.T) {
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h := &Handler{
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localStorage: notReadyReadStorage{},
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lookbackDelta: 5 * time.Minute,
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now: func() model.Time { return 101 * 60 * 1000 }, // 101min after epoch.
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config: &config.Config{
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GlobalConfig: config.GlobalConfig{
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ExternalLabels: scenario.externalLabels,
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},
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},
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}
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req := httptest.NewRequest("GET", "http://example.org/federate?"+scenario.params, nil)
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res := httptest.NewRecorder()
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h.federation(res, req)
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if scenario.code == http.StatusBadRequest {
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// Request are expected to be checked before DB readiness.
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require.Equal(t, http.StatusBadRequest, res.Code)
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return
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}
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require.Equal(t, http.StatusServiceUnavailable, res.Code)
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})
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}
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}
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// normalizeBody sorts the lines within a metric to make it easy to verify the body.
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// (Federation is not taking care of sorting within a metric family.)
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func normalizeBody(body *bytes.Buffer) string {
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var (
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lines []string
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lastHash int
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)
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for line, err := body.ReadString('\n'); err == nil; line, err = body.ReadString('\n') {
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if line[0] == '#' && len(lines) > 0 {
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sort.Strings(lines[lastHash+1:])
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lastHash = len(lines)
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}
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lines = append(lines, line)
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}
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if len(lines) > 0 {
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sort.Strings(lines[lastHash+1:])
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}
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return strings.Join(lines, "")
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}
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func TestFederationWithNativeHistograms(t *testing.T) {
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suite, err := promql.NewTest(t, "")
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if err != nil {
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t.Fatal(err)
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}
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defer suite.Close()
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if err := suite.Run(); err != nil {
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t.Fatal(err)
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}
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var expVec promql.Vector
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db := suite.TSDB()
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hist := &histogram.Histogram{
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Count: 10,
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ZeroCount: 2,
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ZeroThreshold: 0.001,
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Sum: 39.4,
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Schema: 1,
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PositiveSpans: []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 1, Length: 2},
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},
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PositiveBuckets: []int64{1, 1, -1, 0},
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NegativeSpans: []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 1, Length: 2},
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},
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NegativeBuckets: []int64{1, 1, -1, 0},
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}
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app := db.Appender(context.Background())
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for i := 0; i < 6; i++ {
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l := labels.FromStrings("__name__", "test_metric", "foo", fmt.Sprintf("%d", i))
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expL := labels.FromStrings("__name__", "test_metric", "instance", "", "foo", fmt.Sprintf("%d", i))
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if i%3 == 0 {
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_, err = app.Append(0, l, 100*60*1000, float64(i*100))
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expVec = append(expVec, promql.Sample{
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T: 100 * 60 * 1000,
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F: float64(i * 100),
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Metric: expL,
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})
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} else {
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hist.ZeroCount++
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_, err = app.AppendHistogram(0, l, 100*60*1000, hist.Copy(), nil)
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expVec = append(expVec, promql.Sample{
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T: 100 * 60 * 1000,
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H: hist.ToFloat(),
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Metric: expL,
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})
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}
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require.NoError(t, err)
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}
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require.NoError(t, app.Commit())
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h := &Handler{
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localStorage: &dbAdapter{suite.TSDB()},
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lookbackDelta: 5 * time.Minute,
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now: func() model.Time { return 101 * 60 * 1000 }, // 101min after epoch.
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config: &config.Config{
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GlobalConfig: config.GlobalConfig{},
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},
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}
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req := httptest.NewRequest("GET", "http://example.org/federate?match[]=test_metric", nil)
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req.Header.Add("Accept", `application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited,application/openmetrics-text;version=1.0.0;q=0.8,application/openmetrics-text;version=0.0.1;q=0.75,text/plain;version=0.0.4;q=0.5,*/*;q=0.1`)
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res := httptest.NewRecorder()
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h.federation(res, req)
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require.Equal(t, http.StatusOK, res.Code)
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body, err := io.ReadAll(res.Body)
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require.NoError(t, err)
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p := textparse.NewProtobufParser(body)
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var actVec promql.Vector
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metricFamilies := 0
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l := labels.Labels{}
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for {
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et, err := p.Next()
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if err == io.EOF {
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break
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}
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require.NoError(t, err)
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if et == textparse.EntryHistogram || et == textparse.EntrySeries {
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p.Metric(&l)
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}
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switch et {
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case textparse.EntryHelp:
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metricFamilies++
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case textparse.EntryHistogram:
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_, parsedTimestamp, h, fh := p.Histogram()
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require.Nil(t, h)
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actVec = append(actVec, promql.Sample{
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T: *parsedTimestamp,
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H: fh,
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Metric: l,
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})
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case textparse.EntrySeries:
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_, parsedTimestamp, f := p.Series()
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actVec = append(actVec, promql.Sample{
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T: *parsedTimestamp,
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F: f,
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Metric: l,
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})
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}
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}
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// TODO(codesome): Once PromQL is able to set the CounterResetHint on histograms,
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// test it with switching histogram types for metric families.
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require.Equal(t, 4, metricFamilies)
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require.Equal(t, expVec, actVec)
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}
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