Extract pdatagen as standalone tool/package (open-telemetry#13398)

Updates
open-telemetry#12747

Removes one source of DCE disable which is the usage of text/template.

Signed-off-by: Bogdan Drutu <[email protected]>

Author: bogdandrutu

.chloggen/rm-usage-templateds.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: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: pdata
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove usage of text/template from pdata, improves DCE.
+
+# One or more tracking issues or pull requests related to the change
+issues: [12747]
+
+# (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: [user]

Makefile

@@ -246,9 +246,9 @@ genproto_sub:
 
 # Generate structs, functions and tests for pdata package. Must be used after any changes
 # to proto and after running `make genproto`
-genpdata:
-	pushd pdata/ && $(GOCMD) run ./internal/cmd/pdatagen/main.go && popd
-	$(MAKE) fmt
+genpdata: $(PDATAGEN)
+	$(PDATAGEN)
+	$(MAKE) -C pdata fmt
 
 INTERNAL_PROTO_SRC_DIRS := exporter/exporterhelper/internal/queue pdata/xpdata/request/internal
 INTERNAL_PROTO_FILES := $(foreach dir,$(INTERNAL_PROTO_SRC_DIRS),$(wildcard $(dir)/*.proto))

Makefile.Common

@@ -36,6 +36,7 @@ GOFUMPT      := $(TOOLS_BIN_DIR)/gofumpt
 GOIMPORTS    := $(TOOLS_BIN_DIR)/goimports
 GOVULNCHECK  := $(TOOLS_BIN_DIR)/govulncheck
 LINT         := $(TOOLS_BIN_DIR)/golangci-lint
+PDATAGEN    := $(TOOLS_BIN_DIR)/pdatagen
 IMPI         := $(TOOLS_BIN_DIR)/impi
 MISSPELL     := $(TOOLS_BIN_DIR)/misspell
 MULTIMOD     := $(TOOLS_BIN_DIR)/multimod

internal/cmd/pdatagen/Makefile

@@ -0,0 +1 @@
+include ../../../Makefile.Common

internal/cmd/pdatagen/go.mod

@@ -0,0 +1,3 @@
+module go.opentelemetry.io/collector/internal/cmd/pdatagen
+
+go 1.23.0

pdata/internal/cmd/pdatagen/internal/base_fields.go renamed to internal/cmd/pdatagen/internal/base_fields.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package internal // import "go.opentelemetry.io/collector/pdata/internal/cmd/pdatagen/internal"
+package internal // import "go.opentelemetry.io/collector/internal/cmd/pdatagen/internal"
 
 import (
 	"strings"

pdata/internal/cmd/pdatagen/internal/base_slices.go renamed to internal/cmd/pdatagen/internal/base_slices.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package internal // import "go.opentelemetry.io/collector/pdata/internal/cmd/pdatagen/internal"
+package internal // import "go.opentelemetry.io/collector/internal/cmd/pdatagen/internal"
 
 import (
 	"bytes"

pdata/internal/cmd/pdatagen/internal/base_structs.go renamed to internal/cmd/pdatagen/internal/base_structs.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package internal // import "go.opentelemetry.io/collector/pdata/internal/cmd/pdatagen/internal"
+package internal // import "go.opentelemetry.io/collector/internal/cmd/pdatagen/internal"
 
 type baseStruct interface {
 	getName() string

pdata/internal/cmd/pdatagen/internal/packages.go renamed to internal/cmd/pdatagen/internal/packages.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package internal // import "go.opentelemetry.io/collector/pdata/internal/cmd/pdatagen/internal"
+package internal // import "go.opentelemetry.io/collector/internal/cmd/pdatagen/internal"
 
 var pcommon = &Package{
 	info: &PackageInfo{