Add length limit to component (#9901)

Changes component.Type validation regex to only allow a max of 63
characters in a type name.

Fixes #9872

---------

Co-authored-by: Pablo Baeyens <[email protected]>

.chloggen/component-id-length-limit.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: component
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Restricts maximum length for `component.Type` to 63 characters.
+
+# One or more tracking issues or pull requests related to the change
+issues: [9872]
+
+# (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:
+
+# 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: ['api']

cmd/mdatagen/validate.go

@@ -35,7 +35,7 @@ func (md *metadata) Validate() error {
 // can only contain ASCII alphanumeric characters and '_'.
 // We allow '/' for subcomponents.
 // This must be kept in sync with the regex in component/config.go.
-var typeRegexp = regexp.MustCompile(`^[a-zA-Z][0-9a-zA-Z_]*$`)
+var typeRegexp = regexp.MustCompile(`^[a-zA-Z][0-9a-zA-Z_]{0,62}$`)
 
 func (md *metadata) validateType() error {
 	if md.Type == "" {

component/config.go

@@ -128,7 +128,7 @@ func (t Type) MarshalText() ([]byte, error) {
 // A type must start with an ASCII alphabetic character and
 // can only contain ASCII alphanumeric characters and '_'.
 // This must be kept in sync with the regex in cmd/mdatagen/validate.go.
-var typeRegexp = regexp.MustCompile(`^[a-zA-Z][0-9a-zA-Z_]*$`)
+var typeRegexp = regexp.MustCompile(`^[a-zA-Z][0-9a-zA-Z_]{0,62}$`)
 
 // NewType creates a type. It returns an error if the type is invalid.
 // A type must

component/config_test.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -397,6 +398,7 @@ func TestNewType(t *testing.T) {
 		{name: "zipkin_encoding"},
 		{name: "zookeeper"},
 		{name: "zpages"},
+		{name: strings.Repeat("a", 63)},
 
 		{name: "", shouldErr: true},
 		{name: "contains spaces", shouldErr: true},
@@ -405,6 +407,7 @@ func TestNewType(t *testing.T) {
 		{name: "contains/slash", shouldErr: true},
 		{name: "contains:colon", shouldErr: true},
 		{name: "contains#hash", shouldErr: true},
+		{name: strings.Repeat("a", 64), shouldErr: true},
 	}
 
 	for _, tt := range tests {