func Preprocess()

in tool/preprocess/preprocess.go [761:827]

• 45 lines of code
• 8 McCabe index (conditional complexity)

func Preprocess() error {
	// Make sure the project is modularized otherwise we cannot proceed
	err := precheck()
	if err != nil {
		return err
	}

	dp := newDepProcessor()

	err = dp.init()
	if err != nil {
		return err
	}
	defer func() { dp.postProcess() }()
	{
		defer util.PhaseTimer("Preprocess")()

		// Backup go.mod and add additional repalce directives for the
		// alibaba-otel pkg module
		err = dp.rectifyMod()
		if err != nil {
			return err
		}

		// Add otel dependencies as part of the project dependencies
		dp.newRuleImporter()
		dp.runModTidy()

		// Match rules based on the source files plus added otel imports
		err = dp.matchRules()
		if err != nil {
			return err
		}

		// Add hook rule dependency as part of the project dependencies
		dp.addRuleImporter()
		// Update go.mod with the all additional dependencies
		dp.runModTidy()

		// Rectify file rules to make sure we can find them locally
		err = dp.rectifyRule()
		if err != nil {
			return err
		}

		// From this point on, we no longer modify the rules
		err = dp.storeRuleBundles()
		if err != nil {
			return err
		}

		// Retain otel rules and modified user files for debugging
		dp.saveDebugFiles()
	}

	{
		defer util.PhaseTimer("Instrument")()

		// Run go build with toolexec to start instrumentation
		err = runBuildWithToolexec(dp.goBuildCmd)
		if err != nil {
			return err
		}
	}
	util.Log("Build completed successfully")
	return nil
}