You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: handler.go
    path of file: ./repos/yao/widgets/chart
    
    the code of the file until where you have to start completion: package chart

import (
	"fmt"

	gouProcess "github.com/yaoapp/gou/process"
	"github.com/yaoapp/kun/log"
	"github.com/yaoapp/yao/widgets/action"
)

// ********************************
    
func processHandler(p *action.Process, process *gouProcess.Process) (interface{}, error) {

	chart, err := Get(process)
	if err != nil {
		return nil, err
	}
	args := p.Args(process)

	// Process
	name := p.Process
	if name == "" {
		name = p.ProcessBind
	}

	if name == "" {
		log.Error("[chart] %s %s process is required", chart.ID, p.Name)
		return nil, fmt.Errorf("[chart] %s %s process is required", chart.ID, p.Name)
	}

	// Compute Filter
	err = chart.ComputeFilter(p.Name, process, args, chart.getFilter())
	if err != nil {
		log.Error("[chart] %s %s Compute Filter Error: %s", chart.ID, p.Name, err.Error())
	}

	// Before Hook
	if p.Before != nil {
		log.Trace("[chart] %s %s before: exec(%v)", chart.ID, p.Name, args)
		newArgs, err := p.Before.Exec(args, process.Sid, process.Global)
		if err != nil {
			log.Error("[chart] %s %s before: %s", chart.ID, p.Name, err.Error())
		} else {
			log.Trace("[chart] %s %s before: args:%v", chart.ID, p.Name, args)
			args = newArgs
		}
	}

	// Execute Process
	act, err := gouProcess.Of(name, args...)
	if err != nil {
		log.Error("[chart] %s %s -> %s %s", chart.ID, p.Name, name, err.Error())
		return nil, fmt.Errorf("[chart] %s %s -> %s %s", chart.ID, p.Name, name, err.Error())
	}

	res, err := act.WithGlobal(process.Global).WithSID(process.Sid).Exec()
	if err != nil {
		log.Error("[chart] %s %s -> %s %s", chart.ID, p.Name, name, err.Error())
		return nil, fmt.Errorf("[chart] %s %s -> %s %s", chart.ID, p.Name, name, err.Error())
	}

	// Compute View
	err = chart.ComputeView(p.Name, process, res, chart.getField())
	if err != nil {
		log.Error("[chart] %s %s Compute View Error: %s", chart.ID, p.Name, err.Error())
	}

	// After hook
	if p.After != nil {
		log.Trace("[chart] %s %s after: exec(%v)", chart.ID, p.Name, res)
		newRes, err := p.After.Exec(res, process.Sid, process.Global)
		if err != nil {
			log.Error("[chart] %s %s after: %s", chart.ID, p.Name, err.Error())
		} else {
			log.Trace("[chart] %s %s after: %v", chart.ID, p.Name, newRes)
			res = newRes
		}
	}

	return res, nil
}