Solve sub build miss synchronous behavior

Signed-off-by: Tom Chauveau <tom.chauveau@epitech.eu>

client/client.go

@@ -170,16 +170,25 @@ func (c *Client) buildfn(ctx context.Context, st *state.State, env *environment.
 	go catchOutput(buildCh)
 
 	resp, err := c.c.Build(ctx, opts, "", func(ctx context.Context, gw bkgw.Client) (*bkgw.Result, error) {
+		eventsWg := sync.WaitGroup{}
+		closeCh := make(chan *bk.SolveStatus)
+
 		// Close events channel
-		defer close(eventsCh)
+		defer func() {
+			close(closeCh)
+			eventsWg.Wait()
+			close(eventsCh)
+		}()
 
 		s := solver.New(solver.Opts{
-			Control: c.c,
-			Gateway: gw,
-			Events:  eventsCh,
-			Auth:    auth,
-			Secrets: secrets,
-			NoCache: c.cfg.NoCache,
+			Control:    c.c,
+			Gateway:    gw,
+			Events:     eventsCh,
+			EventsWg:   &eventsWg,
+			CloseEvent: closeCh,
+			Auth:       auth,
+			Secrets:    secrets,
+			NoCache:    c.cfg.NoCache,
 		})
 
 		// Compute output overlay

solver/solver.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"sync"
 
 	bk "github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/client/llb"
@@ -23,12 +24,14 @@ type Solver struct {
 }
 
 type Opts struct {
-	Control *bk.Client
-	Gateway bkgw.Client
-	Events  chan *bk.SolveStatus
-	Auth    *RegistryAuthProvider
-	Secrets session.Attachable
-	NoCache bool
+	Control    *bk.Client
+	Gateway    bkgw.Client
+	Events     chan *bk.SolveStatus
+	EventsWg   *sync.WaitGroup
+	CloseEvent chan *bk.SolveStatus
+	Auth       *RegistryAuthProvider
+	Secrets    session.Attachable
+	NoCache    bool
 }
 
 func New(opts Opts) Solver {
@@ -169,11 +172,24 @@ func (s Solver) Export(ctx context.Context, st llb.State, img *dockerfile2llb.Im
 	// Forward this build session events to the main events channel, for logging
 	// purposes.
 	go func() {
-		for event := range ch {
-			s.opts.Events <- event
+		select {
+		case <-s.opts.CloseEvent:
+			return
+		default:
+			for event := range ch {
+				s.opts.Events <- event
+			}
 		}
 	}()
 
+	// Add task to events
+	s.opts.EventsWg.Add(1)
+
+	// Resolve event
+	defer func() {
+		s.opts.EventsWg.Done()
+	}()
+
 	return s.opts.Control.Build(ctx, opts, "", func(ctx context.Context, c bkgw.Client) (*bkgw.Result, error) {
 		res, err := c.Solve(ctx, bkgw.SolveRequest{
 			Definition: def,