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evaluator_test.go
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evaluator_test.go
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package rules_test
import (
"encoding/json"
"errors"
"fmt"
"testing"
"time"
"github.com/icrowley/fake"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
rules "github.com/sonda2208/go-rules"
)
type Evaluation struct {
params map[string]interface{}
expected bool
isError bool
}
type TestCase struct {
rules string
evaluations []Evaluation
funcs map[string]rules.Function
}
func defaultTime() time.Time {
dt, _ := time.Parse(time.RFC3339, "2006-01-02T15:04:05Z")
return dt
}
func getDuration(dur string) time.Duration {
res, _ := time.ParseDuration(dur)
return res
}
func getTime(t string) time.Time {
dt, _ := time.Parse(time.RFC3339, t)
return dt
}
func TestEvaluate(t *testing.T) {
runTestCase := func(testcases []TestCase) {
for _, tc := range testcases {
expr, err := rules.ParseFromString(tc.rules)
require.NoError(t, err)
require.NotNil(t, expr)
for i, e := range tc.evaluations {
res, err := rules.Evaluate(expr, e.params, tc.funcs)
if e.isError {
assert.Error(t, err)
} else {
require.NoError(t, err, fmt.Sprintf("%v %d:%v", tc.rules, i, e.params))
assert.Equal(t, e.expected, res, fmt.Sprintf("%v %d:%v", tc.rules, i, e.params))
}
}
}
}
runTestCaseJSON := func(testcases []TestCase) {
for _, tc := range testcases {
expr, err := rules.ParseFromJSON([]byte(tc.rules))
require.NoError(t, err)
require.NotNil(t, expr)
for i, e := range tc.evaluations {
res, err := rules.Evaluate(expr, e.params, tc.funcs)
if e.isError {
assert.Error(t, err)
} else {
require.NoError(t, err, fmt.Sprintf("%v %d:%v", tc.rules, i, e.params))
assert.Equal(t, e.expected, res, fmt.Sprintf("%v %d:%v", tc.rules, i, e.params))
}
}
}
}
t.Run("General", func(t *testing.T) {
t.Run("Nil expression", func(t *testing.T) {
_, err := rules.Evaluate(nil, nil, nil)
assert.Error(t, err)
})
t.Run("Invalid returned type", func(t *testing.T) {
input := `strlen("???")`
expr, err := rules.ParseFromString(input)
require.NoError(t, err)
require.NotNil(t, expr)
_, err = rules.Evaluate(expr, nil, map[string]rules.Function{
"strlen": func(args ...interface{}) (interface{}, error) {
length := len(args[0].(string))
return (float64)(length), nil
},
})
assert.Error(t, err)
})
t.Run("Parameter not found", func(t *testing.T) {
input := `a == 1`
expr, err := rules.ParseFromString(input)
require.NoError(t, err)
require.NotNil(t, expr)
_, err = rules.Evaluate(expr, nil, nil)
assert.Error(t, err)
})
t.Run("Custom function not found", func(t *testing.T) {
input := `strlen("???")`
expr, err := rules.ParseFromString(input)
require.NoError(t, err)
require.NotNil(t, expr)
_, err = rules.Evaluate(expr, nil, nil)
assert.Error(t, err)
})
t.Run("Custom function returns error", func(t *testing.T) {
input := `strlen("???")`
expr, err := rules.ParseFromString(input)
require.NoError(t, err)
require.NotNil(t, expr)
_, err = rules.Evaluate(expr, nil, map[string]rules.Function{
"strlen": func(args ...interface{}) (interface{}, error) {
return nil, errors.New("unknown")
},
})
assert.Error(t, err)
})
})
t.Run("Parse from JSON with custom function", func(t *testing.T) {
input := `{ "var": "strlen(a)", "op": ">", "val": 1 }`
expr, err := rules.ParseFromJSON(json.RawMessage(input))
require.NoError(t, err)
require.NotNil(t, expr)
res, err := rules.Evaluate(
expr,
map[string]interface{}{
"a": "???",
},
map[string]rules.Function{
"strlen": func(args ...interface{}) (interface{}, error) {
length := len(args[0].(string))
return (float64)(length), nil
},
})
require.NoError(t, err)
assert.True(t, res)
})
t.Run("Parse from JSON with nested custom functions", func(t *testing.T) {
input := `{ "var": "strlen(randomChars(n))", "op": ">", "val": 0 }`
expr, err := rules.ParseFromJSON(json.RawMessage(input))
require.NoError(t, err)
require.NotNil(t, expr)
res, err := rules.Evaluate(
expr,
map[string]interface{}{
"n": 3,
},
map[string]rules.Function{
"strlen": func(args ...interface{}) (interface{}, error) {
length := len(args[0].(string))
return (float64)(length), nil
},
"randomChars": func(args ...interface{}) (interface{}, error) {
n := args[0].(float64)
return fake.CharactersN(int(n)), nil
},
})
require.NoError(t, err)
assert.True(t, res)
})
t.Run("Convert literal", func(t *testing.T) {
testcases := []TestCase{
{
`a < 2`,
[]Evaluation{
{
map[string]interface{}{
"a": 1,
},
true,
false,
},
{
map[string]interface{}{
"a": int32(1),
},
true,
false,
},
{
map[string]interface{}{
"a": int64(1),
},
true,
false,
},
{
map[string]interface{}{
"a": float32(1),
},
true,
false,
},
{
map[string]interface{}{
"a": float64(1),
},
true,
false,
},
{
map[string]interface{}{
"a": 2,
},
false,
false,
},
{
map[string]interface{}{
"a": "?",
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
{
map[string]interface{}{
"a": defaultTime(),
},
false,
true,
},
{
map[string]interface{}{
"a": getDuration("1s"),
},
false,
true,
},
{
map[string]interface{}{
"a": []int{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []int32{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []int64{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []float32{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []float64{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []string{"0", "1", "2"},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{0, 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{int32(0), 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{int64(0), 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{float32(0), 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{float64(0), 1, 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{0, "1", 2},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{"0", "1", "2"},
},
false,
true,
},
{
map[string]interface{}{
"a": []interface{}{"0", 1, "2"},
},
false,
true,
},
{
map[string]interface{}{
"a": struct{}{},
},
false,
true,
},
},
nil,
},
}
runTestCase(testcases)
})
t.Run("OR operator", func(t *testing.T) {
testcases := []TestCase{
{
`a >= 1 || b < 2`,
[]Evaluation{
{
map[string]interface{}{
"a": 1,
"b": 1,
},
true,
false,
},
{
map[string]interface{}{
"a": 0,
"b": 1,
},
true,
false,
},
{
map[string]interface{}{
"a": 0,
"b": 2,
},
false,
false,
},
},
nil,
},
{
`false || true`,
[]Evaluation{
{
nil,
true,
false,
},
},
nil,
},
{
`1 || true`,
[]Evaluation{
{
nil,
false,
true,
},
},
nil,
},
{
`1 || a`,
[]Evaluation{
{
map[string]interface{}{
"a": "0",
},
false,
true,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
{
`false || a`,
[]Evaluation{
{
map[string]interface{}{
"a": false,
},
false,
false,
},
{
map[string]interface{}{
"a": true,
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
}
runTestCase(testcases)
})
t.Run("AND operator", func(t *testing.T) {
testcases := []TestCase{
{
`false && 1`,
[]Evaluation{
{
nil,
false,
true,
},
},
nil,
},
{
`true && true`,
[]Evaluation{
{
nil,
true,
false,
},
},
nil,
},
{
`false && true`,
[]Evaluation{
{
nil,
false,
false,
},
},
nil,
},
{
`true && a`,
[]Evaluation{
{
map[string]interface{}{
"a": false,
},
false,
false,
},
{
map[string]interface{}{
"a": true,
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
{
`a == 1 && b == 2 && c == 3`,
[]Evaluation{
{
map[string]interface{}{
"a": 1,
"b": "2",
"c": 3,
},
false,
true,
},
{
map[string]interface{}{
"a": 1,
"b": "",
"c": 3,
},
false,
true,
},
{
map[string]interface{}{
"a": 1,
"b": 2,
"c": 3,
},
true,
false,
},
},
nil,
},
{
`a > 1 && b < 2`,
[]Evaluation{
{
map[string]interface{}{
"a": 2,
"b": 1,
},
true,
false,
},
{
map[string]interface{}{
"a": 0,
"b": 1,
},
false,
false,
},
{
map[string]interface{}{
"a": 2,
"b": -1,
},
true,
false,
},
{
map[string]interface{}{
"a": 2,
"b": 2,
},
false,
false,
},
},
nil,
},
}
runTestCase(testcases)
})
t.Run("EQ operator", func(t *testing.T) {
testcases := []TestCase{
{
`a == "0"`,
[]Evaluation{
{
map[string]interface{}{
"a": "0",
},
true,
false,
},
{
map[string]interface{}{
"a": "1",
},
false,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
{
map[string]interface{}{
"a": time.Now(),
},
false,
true,
},
},
nil,
},
{
`a == "2006-01-02T15:04:05Z"`,
[]Evaluation{
{
map[string]interface{}{
"a": time.Now(),
},
false,
false,
},
{
map[string]interface{}{
"a": defaultTime(),
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": "",
},
false,
true,
},
},
nil,
},
{
`"2006-01-02T15:04:05Z" == a`,
[]Evaluation{
{
map[string]interface{}{
"a": defaultTime(),
},
true,
false,
},
{
map[string]interface{}{
"a": "2006-01-02T15:04:05Z",
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
{
`true == true`,
[]Evaluation{
{
nil,
true,
false,
},
},
nil,
},
{
`true == false`,
[]Evaluation{
{
nil,
false,
false,
},
},
nil,
},
{
`a == true`,
[]Evaluation{
{
map[string]interface{}{
"a": true,
},
true,
false,
},
{
map[string]interface{}{
"a": false,
},
false,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
{
`true == a`,
[]Evaluation{
{
map[string]interface{}{
"a": true,
},
true,
false,
},
{
map[string]interface{}{
"a": false,
},
false,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
},
nil,
},
{
`a == 1h`,
[]Evaluation{
{
map[string]interface{}{
"a": getDuration("1h"),
},
true,
false,
},
{
map[string]interface{}{
"a": getDuration("2h"),
},
false,
false,
},
{
map[string]interface{}{
"a": "1h",
},
false,
true,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
},
nil,
},
{
`1s == a`,
[]Evaluation{
{
map[string]interface{}{
"a": "1s",
},
true,
false,
},
{
map[string]interface{}{
"a": "2s",
},
false,
false,
},
{
map[string]interface{}{
"a": getDuration("1s"),
},
true,
false,
},
{
map[string]interface{}{
"a": getDuration("2s"),
},
false,
false,
},
{
map[string]interface{}{
"a": "?",
},
false,
true,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
},
nil,
},
}
runTestCase(testcases)
})
t.Run("NEQ operator", func(t *testing.T) {
testcases := []TestCase{
{
`a != 1`,
[]Evaluation{
{
map[string]interface{}{
"a": 2,
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
false,
},
},
nil,
},
{
`a != "0"`,
[]Evaluation{
{
map[string]interface{}{
"a": "0",
},
false,
false,
},
{
map[string]interface{}{
"a": "1",
},
true,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
{
map[string]interface{}{
"a": time.Now(),
},
false,
true,
},
},
nil,
},
{
`a != 2h`,
[]Evaluation{
{
map[string]interface{}{
"a": getDuration("1h"),
},
true,
false,
},
{
map[string]interface{}{
"a": getDuration("2h"),
},
false,
false,
},
{
map[string]interface{}{
"a": 1,
},
false,
true,
},
{
map[string]interface{}{
"a": false,
},
false,
true,
},
{
map[string]interface{}{
"a": time.Now(),
},
false,
true,
},