github.com/m3db/m3@v1.5.0/src/query/api/v1/handler/prometheus/native/parse_threshold_test.go

// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package native

import (
	"fmt"
	"io"
	"io/ioutil"
	"net/http/httptest"
	"net/url"
	"testing"

	"github.com/m3db/m3/src/query/api/v1/options"
	"github.com/m3db/m3/src/query/executor"
	"github.com/m3db/m3/src/x/instrument"
	xtest "github.com/m3db/m3/src/x/test"
	pql "github.com/prometheus/prometheus/promql/parser"

	"github.com/stretchr/testify/require"
)

var thresholdTests = []struct {
	query string
	ex    string
}{
	{
		"foo",
		`{
			"query": {
				"name":"fetch"
			}
		}`,
	},
	{
		"sum(a)-3",
		`{
			"query": {
				"name": "-",
				"children": [
					{
						"name": "sum",
						"children": [
							{
								"name": "fetch"
							}
						]
					},
					{
						"name": "scalar"
					}
				]
			}
		}`,
	},
	{
		"1 > bool 2",
		`{
			"query": {
				"children": [
					{
						"name": "scalar"
					},
					{
						"name": "scalar"
					}
				],
				"name": ">"
			}
		}`,
	},
	{
		"foo > bar",
		`{
			"query": {
				"children": [
					{
						"name": "fetch"
					},
					{
						"name": "fetch"
					}
				],
				"name": ">"
			}
		}`,
	},
	{
		"up > 13.37",
		`{
			"query": {
				"name": "fetch"
			},
			"threshold": {
				"comparator": ">",
				"value": 13.37
			}
		}`,
	},
	{
		"1 <= bool (foo or sum(rate(bar[5m])))",
		`{
			"query": {
				"children": [
					{
						"name": "fetch"
					},
					{
						"children": [
							{
								"children": [
									{
										"name": "fetch"
									}
								],
								"name": "rate"
							}
						],
						"name": "sum"
					}
				],
				"name": "or"
			},
			"threshold": {
				"comparator": ">=",
				"value": 1
			}
		}`,
	},
	{
		"foo == -0.31",
		`{
			"query": {
				"name": "fetch"
			},
			"threshold": {
				"comparator": "==",
				"value": -0.31
			}
		}`,
	},
	{
		"0 != bar",
		`{
			"query": {
				"name": "fetch"
			},
			"threshold": {
				"comparator": "!=",
				"value": 0
			}
		}`,
	},
}

func TestParseThreshold(t *testing.T) {
	opts := executor.NewEngineOptions().
		SetInstrumentOptions(instrument.NewOptions())

	count := 0
	parse := opts.ParseOptions().ParseFn()
	opts = opts.SetParseOptions(
		opts.ParseOptions().SetParseFn(
			func(query string) (pql.Expr, error) {
				count++
				return parse(query)
			},
		),
	)

	engine := executor.NewEngine(opts)
	for _, tt := range thresholdTests {
		t.Run(tt.query, func(t *testing.T) {
			testParseThreshold(t, engine, tt.query, tt.ex)
		})
	}
}

func testParseThreshold(t *testing.T, engine executor.Engine, query string, expected string) {
	handlerOpts := options.EmptyHandlerOptions().SetEngine(engine)
	h := NewPromThresholdHandler(handlerOpts)
	query = fmt.Sprintf("/threshold?query=%s", url.QueryEscape(query))

	req := httptest.NewRequest("GET", query, nil)
	w := httptest.NewRecorder()

	h.ServeHTTP(w, req)
	body := w.Result().Body
	defer func(body io.ReadCloser) {
		require.NoError(t, body.Close())
	}(body)

	r, err := ioutil.ReadAll(body)
	require.NoError(t, err)

	ex := xtest.MustPrettyJSONString(t, expected)
	actual := xtest.MustPrettyJSONString(t, string(r))
	require.Equal(t, ex, actual, xtest.Diff(ex, actual))
}