fix(routing): 额度饱和时解除任务候选固定

已取得并发租约的任务继续保持候选绑定；仅当已绑定平台的 RPM 或 TPM 已满且存在可用候选时，允许任务在执行前原子迁移到下一平台，避免等待窗口重置。\n\n验证：\n- go test ./internal/runner -count=1\n- go vet ./internal/runner
2026-08-03 12:19:52 +08:00
parent d740e9f676
commit b933d59783
2 changed files with 74 additions and 0 deletions
@@ -227,6 +227,70 @@ func TestPinCandidatesToTaskAdmissionAllowsRequestedReselection(t *testing.T) {
 	}
 }

+func TestPinCandidatesToTaskAdmissionAllowsProviderRateQuotaMigration(t *testing.T) {
+	input := []store.RuntimeModelCandidate{
+		{
+			PlatformID:       "platform-b",
+			PlatformModelID:  "model-b",
+			PlatformPriority: 200,
+			LoadMetrics: store.RuntimeCandidateLoadMetrics{
+				RPMLimit:   12,
+				RPMCurrent: 0,
+			},
+		},
+		{
+			PlatformID:       "platform-a",
+			PlatformModelID:  "model-a",
+			PlatformPriority: 100,
+			LoadAvoided:      true,
+			LoadMetrics: store.RuntimeCandidateLoadMetrics{
+				RPMLimit:   4,
+				RPMCurrent: 4,
+			},
+		},
+	}
+	admission := &store.TaskAdmission{
+		Status:          "admitted",
+		PlatformID:      "platform-a",
+		PlatformModelID: "model-a",
+	}
+
+	got, pinned := pinCandidatesToTaskAdmission(input, admission)
+
+	if pinned {
+		t.Fatalf("rate-full provider remained pinned: %+v", got)
+	}
+	if got[0].PlatformModelID != "model-b" {
+		t.Fatalf("available fallback was not preserved: %+v", got)
+	}
+}
+
+func TestPinCandidatesToTaskAdmissionKeepsConcurrencyLeaseBinding(t *testing.T) {
+	input := []store.RuntimeModelCandidate{
+		{PlatformID: "platform-b", PlatformModelID: "model-b"},
+		{
+			PlatformID:      "platform-a",
+			PlatformModelID: "model-a",
+			LoadAvoided:     true,
+			LoadMetrics: store.RuntimeCandidateLoadMetrics{
+				ConcurrentLimit:   2,
+				ConcurrentCurrent: 2,
+			},
+		},
+	}
+	admission := &store.TaskAdmission{
+		Status:          "admitted",
+		PlatformID:      "platform-a",
+		PlatformModelID: "model-a",
+	}
+
+	got, pinned := pinCandidatesToTaskAdmission(input, admission)
+
+	if !pinned || got[0].PlatformModelID != "model-a" {
+		t.Fatalf("valid concurrency lease binding was not preserved: pinned=%v candidates=%+v", pinned, got)
+	}
+}
+
 func TestPinCandidatesToTaskAdmissionIgnoresMissingCandidate(t *testing.T) {
 	input := []store.RuntimeModelCandidate{
 		{PlatformID: "platform-a", PlatformModelID: "model-a"},