[configcompression] make IsCompressed a member function (#9435)

**Description:** 
Updates `IsCompressed` to be a member function. 

**Link to tracking Issue:** <Issue number if applicable>

Closes
#9434

---------

Co-authored-by: Bogdan Drutu <bogdandrutu@gmail.com>
Co-authored-by: Pablo Baeyens <pbaeyens31+github@gmail.com>

.chloggen/configcompression-make-member-func.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: deprecation
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: configcompressions
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Deprecate `IsCompressed`.  Use `CompressionType.IsCompressed instead` instead.
+
+# One or more tracking issues or pull requests related to the change
+issues: [9435]
+
+# (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]

config/configcompression/compressiontype.go

@@ -17,8 +17,17 @@ const (
 	empty   CompressionType = ""
 )
 
+// IsCompressed returns false if CompressionType is nil, none, or empty. Otherwise it returns true.
+//
+// Deprecated: [0.94.0] use member function CompressionType.IsCompressed instead
 func IsCompressed(compressionType CompressionType) bool {
-	return compressionType != empty && compressionType != none
+	return compressionType.IsCompressed()
+}
+
+// IsCompressed returns false if CompressionType is nil, none, or empty.
+// Otherwise, returns true.
+func (ct *CompressionType) IsCompressed() bool {
+	return ct != nil && *ct != empty && *ct != none
 }
 
 func (ct *CompressionType) UnmarshalText(in []byte) error {

config/configcompression/compressiontype_test.go

@@ -15,31 +15,37 @@ func TestUnmarshalText(t *testing.T) {
 		name            string
 		compressionName []byte
 		shouldError     bool
+		isCompressed    bool
 	}{
 		{
 			name:            "ValidGzip",
 			compressionName: []byte("gzip"),
 			shouldError:     false,
+			isCompressed:    true,
 		},
 		{
 			name:            "ValidZlib",
 			compressionName: []byte("zlib"),
 			shouldError:     false,
+			isCompressed:    true,
 		},
 		{
 			name:            "ValidDeflate",
 			compressionName: []byte("deflate"),
 			shouldError:     false,
+			isCompressed:    true,
 		},
 		{
 			name:            "ValidSnappy",
 			compressionName: []byte("snappy"),
 			shouldError:     false,
+			isCompressed:    true,
 		},
 		{
 			name:            "ValidZstd",
 			compressionName: []byte("zstd"),
 			shouldError:     false,
+			isCompressed:    true,
 		},
 		{
 			name:            "ValidEmpty",
@@ -66,7 +72,9 @@ func TestUnmarshalText(t *testing.T) {
 				return
 			}
 			require.NoError(t, err)
-			assert.Equal(t, temp, CompressionType(tt.compressionName))
+			ct := CompressionType(tt.compressionName)
+			assert.Equal(t, temp, ct)
+			assert.Equal(t, tt.isCompressed, ct.IsCompressed())
 		})
 	}
 }

config/configgrpc/configgrpc.go

@@ -186,7 +186,7 @@ func (gcs *GRPCClientSettings) ToClientConn(ctx context.Context, host component.
 
 func (gcs *GRPCClientSettings) toDialOptions(host component.Host, settings component.TelemetrySettings) ([]grpc.DialOption, error) {
 	var opts []grpc.DialOption
-	if configcompression.IsCompressed(gcs.Compression) {
+	if gcs.Compression.IsCompressed() {
 		cp, err := getGRPCCompressionName(gcs.Compression)
 		if err != nil {
 			return nil, err

config/confighttp/confighttp.go

@@ -211,7 +211,7 @@ func (hcs *HTTPClientConfig) ToClient(host component.Host, settings component.Te
 
 	// Compress the body using specified compression methods if non-empty string is provided.
 	// Supporting gzip, zlib, deflate, snappy, and zstd; none is treated as uncompressed.
-	if configcompression.IsCompressed(hcs.Compression) {
+	if hcs.Compression.IsCompressed() {
 		clientTransport, err = newCompressRoundTripper(clientTransport, hcs.Compression)
 		if err != nil {
 			return nil, err

config/confighttp/confighttp_test.go

@@ -454,7 +454,7 @@ func TestHTTPClientSettingWithAuthConfig(t *testing.T) {
 			transport := client.Transport
 
 			// Compression should wrap Auth, unwrap it
-			if configcompression.IsCompressed(test.settings.Compression) {
+			if test.settings.Compression.IsCompressed() {
 				ct, ok := transport.(*compressRoundTripper)
 				assert.True(t, ok)
 				assert.Equal(t, test.settings.Compression, ct.compressionType)