[pkg/ottl] add duration converter function (open-telemetry#23659)

Description: Added a converter function that takes a string
representation of a duration and converts it to a Golang duration.

Link to tracking Issue:
open-telemetry#22015

Testing: Unit tests for stringGetter to duration.

Documentation:

---------

Co-authored-by: Tyler Helmuth <12352919+TylerHelmuth@users.noreply.github.com>

.chloggen/feat_duration-func.yaml

@@ -0,0 +1,20 @@
+# Use this changelog template to create an entry for release notes.
+# If your change doesn't affect end users, such as a test fix or a tooling change,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'enhancement'
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: 'pkg/ottl'
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Add new `Duration` converter to convert string to a Golang time.duration"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [22015]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

pkg/ottl/ottlfuncs/README.md

@@ -278,6 +278,7 @@ Available Converters:
 - [Concat](#concat)
 - [ConvertCase](#convertcase)
 - [FNV](#fnv)
+- [Duration](#duration)
 - [Int](#int)
 - [IsMap](#ismap)
 - [IsMatch](#ismatch)
@@ -288,6 +289,7 @@ Available Converters:
 - [SHA256](#sha256)
 - [SpanID](#spanid)
 - [Split](#split)
+- [Time](#time)
 - [TraceID](#traceid)
 - [Substring](#substring)
 - [UUID](#UUID)
@@ -335,6 +337,22 @@ Examples:
 
 - `ConvertCase(metric.name, "snake")`
 
+### Duration
+
+`Duration(duration)`
+
+The `Duration` Converter takes a string representation of a duration and converts it to a Golang `time.duration`.
+
+`duration` is a string.
+
+If either `duration` is nil or is in a format that cannot be converted to Golang `time.duration`, an error is returned.
+
+Examples:
+
+- `Duration("3s")`
+- `Duration("333ms")`
+- `Duration("1000000h")`
+
 ### FNV
 
 `FNV(value)`
@@ -569,6 +587,18 @@ Examples:
 
 - ```Split("A|B|C", "|")```
 
+### Time
+
+The `Time` Converter takes a string representation of a time and converts it to a Golang `time.Time`.
+
+`time` is a string. `format` is a string.
+
+If either `time` or `format` are nil, an error is returned. The parser used is the parser at [internal/coreinternal/parser](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/internal/coreinternal/timeutils). If the time and format do not follow the parsing rules used by this parser, an error is returned.
+
+Examples:
+
+- `Time("02/04/2023", "%m/%d/%Y")`
+
 ### TraceID
 
 `TraceID(bytes)`

pkg/ottl/ottlfuncs/func_duration.go

@@ -0,0 +1,43 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package ottlfuncs // import "github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl/ottlfuncs"
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
+)
+
+type DurationArguments[K any] struct {
+	Duration ottl.StringGetter[K] `ottlarg:"0"`
+}
+
+func NewDurationFactory[K any]() ottl.Factory[K] {
+	return ottl.NewFactory("Duration", &DurationArguments[K]{}, createDurationFunction[K])
+}
+func createDurationFunction[K any](_ ottl.FunctionContext, oArgs ottl.Arguments) (ottl.ExprFunc[K], error) {
+	args, ok := oArgs.(*DurationArguments[K])
+
+	if !ok {
+		return nil, fmt.Errorf("DurationFactory args must be of type *DurationArguments[K]")
+	}
+
+	return Duration(args.Duration)
+}
+
+func Duration[K any](duration ottl.StringGetter[K]) (ottl.ExprFunc[K], error) {
+	return func(ctx context.Context, tCtx K) (interface{}, error) {
+		d, err := duration.Get(ctx, tCtx)
+		if err != nil {
+			return nil, err
+		}
+		dur, err := time.ParseDuration(d)
+		if err != nil {
+			return nil, err
+		}
+		return dur, nil
+	}, nil
+}

pkg/ottl/ottlfuncs/func_duration_test.go

@@ -0,0 +1,192 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package ottlfuncs
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
+)
+
+func Test_Duration(t *testing.T) {
+	tests := []struct {
+		name     string
+		duration ottl.StringGetter[interface{}]
+		expected time.Duration
+	}{
+		{
+			name: "100 milliseconds",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "100ms", nil
+				},
+			},
+			expected: time.Duration(100000000),
+		}, {
+			name: "234 microseconds",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "234us", nil
+				},
+			},
+			expected: time.Duration(234000),
+		}, {
+			name: "777 nanoseconds",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "777ns", nil
+				},
+			},
+			expected: time.Duration(777),
+		},
+		{
+			name: "one second",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "1s", nil
+				},
+			},
+			expected: time.Duration(1000000000),
+		},
+		{
+			name: "two hundred second",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "200s", nil
+				},
+			},
+			expected: time.Duration(200000000000),
+		},
+		{
+			name: "three minutes",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "3m", nil
+				},
+			},
+			expected: time.Duration(180000000000),
+		},
+		{
+			name: "45 minutes",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "45m", nil
+				},
+			},
+			expected: time.Duration(2700000000000),
+		},
+		{
+			name: "7 mins, 12 secs",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "7m12s", nil
+				},
+			},
+			expected: time.Duration(432000000000),
+		},
+		{
+			name: "4 hours",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "4h", nil
+				},
+			},
+			expected: time.Duration(14400000000000),
+		},
+		{
+			name: "5 hours, 23 mins, 59 secs",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "5h23m59s", nil
+				},
+			},
+			expected: time.Duration(19439000000000),
+		},
+		{
+			name: "5 hours, 59 secs",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "5h59s", nil
+				},
+			},
+			expected: time.Duration(18059000000000),
+		},
+		{
+			name: "5 hours, 23 mins",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "5h23m", nil
+				},
+			},
+			expected: time.Duration(19380000000000),
+		},
+		{
+			name: "2 mins, 1 sec, 64 microsecs",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "2m1s64us", nil
+				},
+			},
+			expected: time.Duration(121000064000),
+		},
+		{
+			name: "59 hours, 1 min, 78 millisecs",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "59h1m78ms", nil
+				},
+			},
+			expected: time.Duration(212460078000000),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			exprFunc, err := Duration(tt.duration)
+			assert.NoError(t, err)
+			result, err := exprFunc(nil, nil)
+			assert.NoError(t, err)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func Test_DurationError(t *testing.T) {
+	tests := []struct {
+		name          string
+		duration      ottl.StringGetter[interface{}]
+		expectedError string
+	}{
+		{
+			name: "empty duration",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "", nil
+				},
+			},
+			expectedError: "invalid duration",
+		},
+		{
+			name: "empty duration",
+			duration: &ottl.StandardStringGetter[interface{}]{
+				Getter: func(ctx context.Context, tCtx interface{}) (interface{}, error) {
+					return "one second", nil
+				},
+			},
+			expectedError: "invalid duration",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			exprFunc, err := Duration[any](tt.duration)
+			require.NoError(t, err)
+			_, err = exprFunc(context.Background(), nil)
+			assert.ErrorContains(t, err, tt.expectedError)
+		})
+	}
+}

pkg/ottl/ottlfuncs/functions.go

@@ -36,6 +36,7 @@ func converters[K any]() []ottl.Factory[K] {
 		// Converters
 		NewConcatFactory[K](),
 		NewConvertCaseFactory[K](),
+		NewDurationFactory[K](),
 		NewFnvFactory[K](),
 		NewIntFactory[K](),
 		NewIsMapFactory[K](),