Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

api/apitestlib.go

@@ -14,14 +14,13 @@ import (
 
 	"github.com/mattermost/mattermost-server/api4"
 	"github.com/mattermost/mattermost-server/app"
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/store"
 	"github.com/mattermost/mattermost-server/store/sqlstore"
 	"github.com/mattermost/mattermost-server/store/storetest"
 	"github.com/mattermost/mattermost-server/utils"
 	"github.com/mattermost/mattermost-server/wsapi"
-
-	l4g "github.com/alecthomas/log4go"
 )
 
 type TestHelper struct {
@@ -233,8 +232,8 @@ func (me *TestHelper) LinkUserToTeam(user *model.User, team *model.Team) {
 
 	err := me.App.JoinUserToTeam(team, user, "")
 	if err != nil {
-		l4g.Error(err.Error())
-		l4g.Close()
+		mlog.Error(err.Error())
+
 		time.Sleep(time.Second)
 		panic(err)
 	}
@@ -248,8 +247,8 @@ func (me *TestHelper) UpdateUserToTeamAdmin(user *model.User, team *model.Team)
 	tm := &model.TeamMember{TeamId: team.Id, UserId: user.Id, Roles: model.TEAM_USER_ROLE_ID + " " + model.TEAM_ADMIN_ROLE_ID}
 	if tmr := <-me.App.Srv.Store.Team().UpdateMember(tm); tmr.Err != nil {
 		utils.EnableDebugLogForTest()
-		l4g.Error(tmr.Err.Error())
-		l4g.Close()
+		mlog.Error(tmr.Err.Error())
+
 		time.Sleep(time.Second)
 		panic(tmr.Err)
 	}
@@ -262,8 +261,8 @@ func (me *TestHelper) UpdateUserToNonTeamAdmin(user *model.User, team *model.Tea
 	tm := &model.TeamMember{TeamId: team.Id, UserId: user.Id, Roles: model.TEAM_USER_ROLE_ID}
 	if tmr := <-me.App.Srv.Store.Team().UpdateMember(tm); tmr.Err != nil {
 		utils.EnableDebugLogForTest()
-		l4g.Error(tmr.Err.Error())
-		l4g.Close()
+		mlog.Error(tmr.Err.Error())
+
 		time.Sleep(time.Second)
 		panic(tmr.Err)
 	}