fix: stream accumulator exits early (#10593)

the stream accumulator exits as soon as it sees `api.ProgressResponse(status="success")` which isn't strictly correctly
since some requests may have multiple successes, e.g. `/api/create` when the source model needs to be pulled.

server/routes.go

@@ -1341,31 +1341,29 @@ func Serve(ln net.Listener) error {
 
 func waitForStream(c *gin.Context, ch chan any) {
 	c.Header("Content-Type", "application/json")
+	var latest api.ProgressResponse
 	for resp := range ch {
 		switch r := resp.(type) {
 		case api.ProgressResponse:
-			if r.Status == "success" {
-				c.JSON(http.StatusOK, r)
-				return
-			}
+			latest = r
 		case gin.H:
 			status, ok := r["status"].(int)
 			if !ok {
 				status = http.StatusInternalServerError
 			}
-			if errorMsg, ok := r["error"].(string); ok {
-				c.JSON(status, gin.H{"error": errorMsg})
-				return
-			} else {
-				c.JSON(status, gin.H{"error": "unexpected error format in progress response"})
-				return
+			errorMsg, ok := r["error"].(string)
+			if !ok {
+				errorMsg = "unknown error"
 			}
+			c.JSON(status, gin.H{"error": errorMsg})
+			return
 		default:
-			c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected progress response"})
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "unknown message type"})
 			return
 		}
 	}
-	c.JSON(http.StatusInternalServerError, gin.H{"error": "unexpected end of progress response"})
+
+	c.JSON(http.StatusOK, latest)
 }
 
 func streamResponse(c *gin.Context, ch chan any) {

server/routes_test.go

@@ -21,6 +21,8 @@ import (
 	"testing"
 	"unicode"
 
+	"github.com/gin-gonic/gin"
+	"github.com/google/go-cmp/cmp"
 	"github.com/ollama/ollama/api"
 	"github.com/ollama/ollama/fs/ggml"
 	"github.com/ollama/ollama/openai"
@@ -882,3 +884,87 @@ func TestFilterThinkTags(t *testing.T) {
 		}
 	}
 }
+
+func TestWaitForStream(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	cases := []struct {
+		name       string
+		messages   []any
+		expectCode int
+		expectBody string
+	}{
+		{
+			name: "error",
+			messages: []any{
+				gin.H{"error": "internal server error"},
+			},
+			expectCode: http.StatusInternalServerError,
+			expectBody: `{"error":"internal server error"}`,
+		},
+		{
+			name: "error status",
+			messages: []any{
+				gin.H{"status": http.StatusNotFound, "error": "not found"},
+			},
+			expectCode: http.StatusNotFound,
+			expectBody: `{"error":"not found"}`,
+		},
+		{
+			name: "unknown error",
+			messages: []any{
+				gin.H{"msg": "something else"},
+			},
+			expectCode: http.StatusInternalServerError,
+			expectBody: `{"error":"unknown error"}`,
+		},
+		{
+			name: "unknown type",
+			messages: []any{
+				struct{}{},
+			},
+			expectCode: http.StatusInternalServerError,
+			expectBody: `{"error":"unknown message type"}`,
+		},
+		{
+			name: "progress success",
+			messages: []any{
+				api.ProgressResponse{Status: "success"},
+			},
+			expectCode: http.StatusOK,
+			expectBody: `{"status":"success"}`,
+		},
+		{
+			name: "progress more than success",
+			messages: []any{
+				api.ProgressResponse{Status: "success"},
+				api.ProgressResponse{Status: "one more thing"},
+			},
+			expectCode: http.StatusOK,
+			expectBody: `{"status":"one more thing"}`,
+		},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			w := httptest.NewRecorder()
+			c, _ := gin.CreateTestContext(w)
+
+			ch := make(chan any, len(tt.messages))
+			for _, msg := range tt.messages {
+				ch <- msg
+			}
+			close(ch)
+
+			waitForStream(c, ch)
+
+			if w.Code != tt.expectCode {
+				t.Errorf("expected status %d, got %d", tt.expectCode, w.Code)
+			}
+
+			if diff := cmp.Diff(w.Body.String(), tt.expectBody); diff != "" {
+				t.Errorf("body mismatch (-want +got):\n%s", diff)
+			}
+		})
+	}
+}