[pkg/ottl] Add function ProfileID() (open-telemetry#39587)

#### Description
Add the OTTL function `ProfileID()`, which is currently missing.

Author: rockdaboot

.chloggen/ottl-add-ProfileID-function.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# 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 the OTTL function ProfileID()
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [39587]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

pkg/ottl/e2e/e2e_test.go

@@ -997,6 +997,12 @@ func Test_e2e_converters(t *testing.T) {
 				tCtx.GetLogRecord().SetSpanID(pcommon.NewSpanIDEmpty())
 			},
 		},
+		{
+			statement: `set(attributes["test"], "pass") where String(ProfileID(0x00000000000000000000000000000001)) == "[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1]"`,
+			want: func(tCtx ottllog.TransformContext) {
+				tCtx.GetLogRecord().Attributes().PutStr("test", "pass")
+			},
+		},
 		{
 			statement: `set(attributes["test"], Split(attributes["flags"], "|"))`,
 			want: func(tCtx ottllog.TransformContext) {

pkg/ottl/ottlfuncs/README.md

@@ -500,6 +500,7 @@ Available Converters:
 - [ParseKeyValue](#parsekeyvalue)
 - [ParseSimplifiedXML](#parsesimplifiedxml)
 - [ParseXML](#parsexml)
+- [ProfileID](#profileid)
 - [RemoveXML](#removexml)
 - [Second](#second)
 - [Seconds](#seconds)
@@ -1714,6 +1715,18 @@ Examples:
 
 - `ParseXML("<HostInfo hostname=\"example.com\" zone=\"east-1\" cloudprovider=\"aws\" />")`
 
+### ProfileID
+
+`ProfileID(bytes)`
+
+The `ProfileID` Converter returns a `pprofile.ProfileID` struct from the given byte slice.
+
+`bytes` is a byte slice of exactly 16 bytes.
+
+Examples:
+
+- `ProfileID(0x00112233445566778899aabbccddeeff)`
+
 ### RemoveXML
 
 `RemoveXML(target, xpath)`

pkg/ottl/ottlfuncs/func_profile_id.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"
+	"errors"
+	"fmt"
+
+	"go.opentelemetry.io/collector/pdata/pprofile"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
+)
+
+type ProfileIDArguments[K any] struct {
+	Bytes []byte
+}
+
+func NewProfileIDFactory[K any]() ottl.Factory[K] {
+	return ottl.NewFactory("ProfileID", &ProfileIDArguments[K]{}, createProfileIDFunction[K])
+}
+
+func createProfileIDFunction[K any](_ ottl.FunctionContext, oArgs ottl.Arguments) (ottl.ExprFunc[K], error) {
+	args, ok := oArgs.(*ProfileIDArguments[K])
+
+	if !ok {
+		return nil, errors.New("ProfileIDFactory args must be of type *ProfileIDArguments[K]")
+	}
+
+	return profileID[K](args.Bytes)
+}
+
+func profileID[K any](bytes []byte) (ottl.ExprFunc[K], error) {
+	id := pprofile.ProfileID{}
+	if len(bytes) != len(id) {
+		return nil, fmt.Errorf("profile ids must be %d bytes", len(id))
+	}
+	copy(id[:], bytes)
+	return func(context.Context, K) (any, error) {
+		return id, nil
+	}, nil
+}

pkg/ottl/ottlfuncs/func_profile_id_test.go

@@ -0,0 +1,66 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package ottlfuncs
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/pdata/pprofile"
+)
+
+func Test_profileID(t *testing.T) {
+	tests := []struct {
+		name  string
+		bytes []byte
+		want  pprofile.ProfileID
+	}{
+		{
+			name:  "create profile id",
+			bytes: []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16},
+			want:  pprofile.ProfileID([16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			exprFunc, err := profileID[any](tt.bytes)
+			assert.NoError(t, err)
+			result, err := exprFunc(nil, nil)
+			assert.NoError(t, err)
+			assert.Equal(t, tt.want, result)
+		})
+	}
+}
+
+func Test_profileID_validation(t *testing.T) {
+	tests := []struct {
+		name  string
+		bytes []byte
+		err   string
+	}{
+		{
+			name:  "nil profile id",
+			bytes: nil,
+			err:   "profile ids must be 16 bytes",
+		},
+		{
+			name:  "byte slice less than 16",
+			bytes: []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+			err:   "profile ids must be 16 bytes",
+		},
+		{
+			name:  "byte slice longer than 16",
+			bytes: []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17},
+			err:   "profile ids must be 16 bytes",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := profileID[any](tt.bytes)
+			require.Error(t, err)
+			assert.ErrorContains(t, err, tt.err)
+		})
+	}
+}

pkg/ottl/ottlfuncs/functions.go

@@ -114,5 +114,6 @@ func converters[K any]() []ottl.Factory[K] {
 		NewYearFactory[K](),
 		NewHexFactory[K](),
 		NewSliceToMapFactory[K](),
+		NewProfileIDFactory[K](),
 	}
 }