[MM-49989] Pass a context.Context to Client4 methods (#22922)

* Migrate all method in model/client4.go to accept a context.Context

* Fix th.*Client

* Fix remaining issues

* Empty commit to triger CI

* Fix test

* Add cancellation test

* Test that returned error is context.Canceled

* Fix bad merge

* Update mmctl code

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/slashcommands/auto_environment.go

@@ -4,6 +4,7 @@
 package slashcommands
 
 import (
+	"context"
 	"math/rand"
 	"time"
 
@@ -37,7 +38,7 @@ func CreateTestEnvironmentWithTeams(a *app.App, c request.CTX, client *model.Cli
 		if err != nil {
 			return TestEnvironment{}, err
 		}
-		client.LoginById(randomUser.Id, UserPassword)
+		client.LoginById(context.Background(), randomUser.Id, UserPassword)
 		teamEnvironment, err := CreateTestEnvironmentInTeam(a, c, client, team, rangeChannels, rangeUsers, rangePosts, fuzzy)
 		if err != nil {
 			return TestEnvironment{}, err
@@ -77,12 +78,12 @@ func CreateTestEnvironmentInTeam(a *app.App, c request.CTX, client *model.Client
 	// Have every user join every channel
 	for _, user := range users {
 		for _, channel := range channels {
-			_, _, err := client.LoginById(user.Id, UserPassword)
+			_, _, err := client.LoginById(context.Background(), user.Id, UserPassword)
 			if err != nil {
 				return TeamEnvironment{}, err
 			}
 
-			_, _, err = client.AddChannelMember(channel.Id, user.Id)
+			_, _, err = client.AddChannelMember(context.Background(), channel.Id, user.Id)
 			if err != nil {
 				return TeamEnvironment{}, err
 			}
@@ -93,7 +94,7 @@ func CreateTestEnvironmentInTeam(a *app.App, c request.CTX, client *model.Client
 	numImages := utils.RandIntFromRange(rangePosts) / 4
 	for j := 0; j < numPosts; j++ {
 		user := users[utils.RandIntFromRange(utils.Range{Begin: 0, End: len(users) - 1})]
-		_, _, err := client.LoginById(user.Id, UserPassword)
+		_, _, err := client.LoginById(context.Background(), user.Id, UserPassword)
 		if err != nil {
 			return TeamEnvironment{}, err
 		}

server/channels/app/slashcommands/auto_teams.go

@@ -4,6 +4,8 @@
 package slashcommands
 
 import (
+	"context"
+
 	"github.com/mattermost/mattermost-server/server/public/model"
 	"github.com/mattermost/mattermost-server/server/v8/channels/utils"
 )
@@ -57,7 +59,7 @@ func (cfg *AutoTeamCreator) createRandomTeam() (*model.Team, error) {
 		Type:        model.TeamOpen,
 	}
 
-	createdTeam, _, err := cfg.client.CreateTeam(team)
+	createdTeam, _, err := cfg.client.CreateTeam(context.Background(), team)
 	if err != nil {
 		return nil, err
 	}

server/channels/app/slashcommands/auto_users.go

@@ -4,6 +4,7 @@
 package slashcommands
 
 import (
+	"context"
 	"errors"
 	"net/http"
 
@@ -42,18 +43,18 @@ func NewAutoUserCreator(a *app.App, client *model.Client4, team *model.Team) *Au
 
 // Basic test team and user so you always know one
 func CreateBasicUser(a *app.App, client *model.Client4) error {
-	found, _, _ := client.TeamExists(BTestTeamName, "")
+	found, _, _ := client.TeamExists(context.Background(), BTestTeamName, "")
 	if found {
 		return nil
 	}
 
 	newteam := &model.Team{DisplayName: BTestTeamDisplayName, Name: BTestTeamName, Email: BTestTeamEmail, Type: BTestTeamType}
-	basicteam, _, err := client.CreateTeam(newteam)
+	basicteam, _, err := client.CreateTeam(context.Background(), newteam)
 	if err != nil {
 		return err
 	}
 	newuser := &model.User{Email: BTestUserEmail, Nickname: BTestUserName, Password: BTestUserPassword}
-	ruser, _, err := client.CreateUser(newuser)
+	ruser, _, err := client.CreateUser(context.Background(), newuser)
 	if err != nil {
 		return err
 	}

server/channels/app/slashcommands/command_loadtest.go

@@ -4,6 +4,7 @@
 package slashcommands
 
 import (
+	"context"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -248,7 +249,7 @@ func (*LoadTestProvider) SetupCommand(a *app.App, c request.CTX, args *model.Com
 		if err := CreateBasicUser(a, client); err != nil {
 			return &model.CommandResponse{Text: "Failed to create testing environment", ResponseType: model.CommandResponseTypeEphemeral}, err
 		}
-		_, _, err := client.Login(BTestUserEmail, BTestUserPassword)
+		_, _, err := client.Login(context.Background(), BTestUserEmail, BTestUserPassword)
 		if err != nil {
 			return &model.CommandResponse{Text: "Failed to create testing environment", ResponseType: model.CommandResponseTypeEphemeral}, err
 		}
@@ -604,7 +605,7 @@ func (*LoadTestProvider) PostCommand(a *app.App, c request.CTX, args *model.Comm
 	}
 
 	client := model.NewAPIv4Client(args.SiteURL)
-	_, _, nErr := client.LoginById(user.Id, passwd)
+	_, _, nErr := client.LoginById(context.Background(), user.Id, passwd)
 	if nErr != nil {
 		return &model.CommandResponse{Text: "Failed to login a user", ResponseType: model.CommandResponseTypeEphemeral}, nErr
 	}
@@ -613,7 +614,7 @@ func (*LoadTestProvider) PostCommand(a *app.App, c request.CTX, args *model.Comm
 		ChannelId: channel.Id,
 		Message:   textMessage,
 	}
-	_, _, nErr = client.CreatePost(post)
+	_, _, nErr = client.CreatePost(context.Background(), post)
 	if nErr != nil {
 		return &model.CommandResponse{Text: "Failed to create a post", ResponseType: model.CommandResponseTypeEphemeral}, nErr
 	}