add one minute chart + refactor rpc

- add one minute charts
- update disk io to use bytes
- update hub and agent connection interfaces / handlers to be more
flexible
- change agent cache to use cache time instead of session id
- refactor collection of metrics which require deltas to track
separately per cache time

internal/hub/ws/request_manager_test.go

@@ -0,0 +1,81 @@
+//go:build testing
+// +build testing
+
+package ws
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestRequestManager_BasicFunctionality tests the request manager without mocking gws.Conn
+func TestRequestManager_BasicFunctionality(t *testing.T) {
+	// We'll test the core logic without mocking the connection
+	// since the gws.Conn interface is complex to mock properly
+
+	t.Run("request ID generation", func(t *testing.T) {
+		// Test that request IDs are generated sequentially and uniquely
+		rm := &RequestManager{}
+
+		// Simulate multiple ID generations
+		id1 := rm.nextID.Add(1)
+		id2 := rm.nextID.Add(1)
+		id3 := rm.nextID.Add(1)
+
+		assert.NotEqual(t, id1, id2)
+		assert.NotEqual(t, id2, id3)
+		assert.Greater(t, id2, id1)
+		assert.Greater(t, id3, id2)
+	})
+
+	t.Run("pending request tracking", func(t *testing.T) {
+		rm := &RequestManager{
+			pendingReqs: make(map[RequestID]*PendingRequest),
+		}
+
+		// Initially no pending requests
+		assert.Equal(t, 0, rm.GetPendingCount())
+
+		// Add some fake pending requests
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		req1 := &PendingRequest{
+			ID:      RequestID(1),
+			Context: ctx,
+			Cancel:  cancel,
+		}
+		req2 := &PendingRequest{
+			ID:      RequestID(2),
+			Context: ctx,
+			Cancel:  cancel,
+		}
+
+		rm.pendingReqs[req1.ID] = req1
+		rm.pendingReqs[req2.ID] = req2
+
+		assert.Equal(t, 2, rm.GetPendingCount())
+
+		// Remove one
+		delete(rm.pendingReqs, req1.ID)
+		assert.Equal(t, 1, rm.GetPendingCount())
+
+		// Remove all
+		delete(rm.pendingReqs, req2.ID)
+		assert.Equal(t, 0, rm.GetPendingCount())
+	})
+
+	t.Run("context cancellation", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(context.Background(), 1*time.Millisecond)
+		defer cancel()
+
+		// Wait for context to timeout
+		<-ctx.Done()
+
+		// Verify context was cancelled
+		assert.Equal(t, context.DeadlineExceeded, ctx.Err())
+	})
+}