all: implement API and interface for attack functionality

When the user click "Attack" it will call the API to run the load testing.
If there is load testing currently, it will return with an error.

On success, the result of load testing will be stored on directory
defined in Environment.ResultsDir with file named

	<HttpTarget.ID>.<date_time>.<RPS>x<Duration>s.<ResultsSuffix>.bin

This file contains the vegeta.Results.

1 files changed, 23 insertions, 0 deletions

diff --git a/errors.go b/errors.go
index 989561a..faf009c 100644
--- a/errors.go
+++ b/errors.go
@@ -12,6 +12,29 @@ import (
 	libhttp "github.com/shuLhan/share/lib/http"
 )
 
+func errAttackConflict(ltr *loadTestingResult) error {
+	res := &libhttp.EndpointResponse{
+		E: liberrors.E{
+			Code:    http.StatusConflict,
+			Message: "another attack is already running",
+			Name:    "ERR_ATTACK_CONFLICT",
+		},
+		Data: ltr,
+	}
+	return res
+}
+
+func errAttackNotAllowed() error {
+	res := &libhttp.EndpointResponse{
+		E: liberrors.E{
+			Code:    http.StatusNotAcceptable,
+			Message: "attack is not allowed",
+			Name:    "ERR_ATTACK_NOT_ALLOWED",
+		},
+	}
+	return res
+}
+
 func errInternal(err error) error {
 	res := &libhttp.EndpointResponse{
 		E: liberrors.E{