Controller--
({
	doinit : function(component) {
       component.set( 'v.cols' , [
            {
                label: 'Name',
                fieldName: 'Name',
                type: 'text'
            },
           {
                'label': 'Price',
                'fieldName': 'Unitprice',
                'type': 'Currency'
            },
            {
                'label': 'Action',
                'type': 'button',
                'typeAttributes': {
                    'label': 'Add to Cart',
                    'name': 'add to cart'
                }
            },
            {
                'label': 'Action',
                'type': 'button',
                'typeAttributes': {
                    'label': 'Buy',
                    'name':'buy'
                    
                }
            },
           { 'label': 'action history',
                'fieldName': 'action history',
                'type': 'text',
            	'value':'Edit'
           }
            ]);
        
  var action = component.get("c.getproduct"); 
       
        action.setCallback(this, function(actionResult) {
            var state = actionResult.getState();
        if (state === "SUCCESS") {
            var records = actionResult.getReturnValue();
            for (var i = 0; i < records.length; i++) {
				 records[i].Name = records[i].Product2.Name;
                records[i].Unitprice= records[i].UnitPrice;
            }
             component.set("v.productname", records);
            
          
        }
            });
          $A.enqueueAction(action);
    },
    onRowAction:function(component, event, helper) {
        var act = component.get("c.sendmail");
        var getEmail = component.get("v.address");
       var records = actionResult.getReturnValue();
       act.setParams({
            'mMail': getEmail,});
var actionName = event.getParam('action').name;
        if(actionName=='add to cart'){
    alert("product added to cart");
        }
        if(actionName=='buy'){
        alert("product will be delivered"); 
            act.setCallback(this, function(response) {
                var state = response.getState();
                    if (state === "SUCCESS") {
                      response.getReturnValue();                   
                    }  });
      }
$A.enqueueAction(act);             
}
})

Component--
<aura:component controller="products" > 
<aura:attribute name="productname" type="List"/>
<aura:attribute name="cols" type="List"/> 
    <aura:attribute name="address" type="string"/>
   <aura:attribute name="subject" type="string"/>
   
   <aura:attribute name="mailStatus" type="boolean" default="false"/>
   
<aura:handler name="init" value="{!this}" action="{!c.doinit}"/>
<lightning:datatable
            data="{!v.productname}"
        	columns="{!v.cols}"
            keyField="Id"
            onrowaction="{!c.onRowAction}"/>
   
       
</aura:component> 

apex code--
global with sharing class products {
    @AuraEnabled
    public static List<PricebookEntry> getproduct() {
List<PricebookEntry> prod= [SELECT Product2.Name, Unitprice FROM PricebookEntry];
return prod;

    }
     @AuraEnabled
      public static void sendmail(String address, String subject, String body) {
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[] {'mohantyniki23@gmail.com'};
        mail.setToAddresses(toAddresses);
          String message = 'Thank you choosing our service.Your package will be delivered in 5 days.';
        mail.setSubject('Order confirmation');
        mail.setPlainTextBody(message);
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }
}