Add debug graph to static network

examples/CMakeLists.txt

@@ -35,6 +35,7 @@ if(OpenCV_FOUND)
 
     if(KPN_WEB_DEBUG)
         kpn_target_enable_web_debug(09_opencv_cellshade)
+        kpn_target_enable_web_debug(13_debug_cellshade)
     endif()
     message(STATUS "KPN++ example 09_opencv_cellshade: OpenCV ${OpenCV_VERSION} found — building")
 else()

include/kpn/channel.hpp

@@ -172,4 +172,20 @@ private:
     ChannelStats                 stats_;
 };
 
+// ── Channel probe — type-erased snapshot accessor ─────────────────────────────
+// Used by both Network and StaticNetwork for diagnostics.
+
+struct IChannelProbe {
+    virtual ~IChannelProbe() = default;
+    virtual ChannelSnapshot snapshot() const = 0;
+};
+
+template<typename T>
+struct ChannelProbe : IChannelProbe {
+    const Channel<T>& ch;
+    std::string       name;
+    ChannelProbe(const Channel<T>& c, std::string n) : ch(c), name(std::move(n)) {}
+    ChannelSnapshot snapshot() const override { return ch.snapshot(name); }
+};
+
 } // namespace kpn

include/kpn/fanout.hpp

@@ -53,6 +53,7 @@ public:
 
     static constexpr std::size_t input_count  = 1;
     static constexpr std::size_t output_count = N;
+    static constexpr std::size_t unique_tag   = Id;
 
     explicit FanoutNode(std::size_t fifo_capacity = 5)
         : fifo_capacity_(fifo_capacity)

include/kpn/network.hpp

@@ -35,21 +35,6 @@ public:
         : std::runtime_error(std::move(msg)) {}
 };
 
-// ── Channel snapshot accessor — type-erased so Network can collect them ───────
-
-struct IChannelProbe {
-    virtual ~IChannelProbe() = default;
-    virtual ChannelSnapshot snapshot() const = 0;
-};
-
-template<typename T>
-struct ChannelProbe : IChannelProbe {
-    const Channel<T>& ch;
-    std::string       name;
-    ChannelProbe(const Channel<T>& c, std::string n) : ch(c), name(std::move(n)) {}
-    ChannelSnapshot snapshot() const override { return ch.snapshot(name); }
-};
-
 // ── Network ───────────────────────────────────────────────────────────────────
 
 class Network : public INode {

include/kpn/static_network.hpp

@@ -7,11 +7,17 @@
 #include "tmp/fanout_groups.hpp"
 #include "tmp/topo_sort.hpp"
 
+#ifdef KPN_WEB_DEBUG
+#include "web_debug.hpp"
+#include <memory>
+#endif
+
 #include <iostream>
 #include <string>
 #include <tuple>
 #include <type_traits>
 #include <utility>
+#include <vector>
 
 namespace kpn {
 
@@ -82,23 +88,41 @@ public:
     StaticNetwork(std::unique_ptr<FanoutStorage> fanouts,
                   std::vector<INode*>        user_nodes_topo,
                   std::vector<INode*>        fanout_ptrs,
-                  std::vector<std::string>   user_node_names)
+                  std::vector<std::string>   user_node_names,
+                  std::vector<std::string>   fanout_node_names,
+                  std::vector<std::unique_ptr<IChannelProbe>> channel_probes)
         : fanouts_(std::move(fanouts))
         , user_nodes_topo_(std::move(user_nodes_topo))
         , fanout_nodes_ptr_(std::move(fanout_ptrs))
         , user_node_names_(std::move(user_node_names))
+        , fanout_node_names_(std::move(fanout_node_names))
+        , channel_probes_(std::move(channel_probes))
     {}
 
     ~StaticNetwork() override { stop(); }
 
     void start() override {
         stop_flag_ = false;
+        start_time_ = clock_t::now();
         for (auto* n : user_nodes_topo_)  n->start();
         for (auto* n : fanout_nodes_ptr_) n->start();
+#ifdef KPN_WEB_DEBUG
+        web_server_ = std::make_unique<web_debug::WebDebugServer>(
+            web_debug_port_,
+            [this]() {
+                auto s = collect_snapshots();
+                return web_debug::to_json(s.nodes, s.channels, s.elapsed_s);
+            });
+        web_server_->start();
+        std::cerr << "[kpn] web debug UI: http://localhost:" << web_debug_port_ << "\n";
+#endif
     }
 
     void stop() override {
         stop_flag_ = true;
+#ifdef KPN_WEB_DEBUG
+        if (web_server_) web_server_->stop();
+#endif
         for (auto it = fanout_nodes_ptr_.rbegin(); it != fanout_nodes_ptr_.rend(); ++it)
             (*it)->stop();
         for (auto it = user_nodes_topo_.rbegin(); it != user_nodes_topo_.rend(); ++it)
@@ -113,6 +137,10 @@ public:
         return {n, 0, 0, 0, 0, 0, 0, 0};
     }
 
+#ifdef KPN_WEB_DEBUG
+    void set_web_debug_port(uint16_t port) { web_debug_port_ = port; }
+#endif
+
     // Print diagnostics using compile-time node labels
     void print_diagnostics(std::ostream& os = std::cerr) const {
         os << "\n┌─ KPN++ StaticNetwork diagnostics ─────────────────────────────\n";
@@ -128,12 +156,42 @@ public:
     FanoutStorage& fanouts_storage() { return *fanouts_; }
 
 private:
+    struct Snapshots {
+        std::vector<NodeSnapshot>    nodes;
+        std::vector<ChannelSnapshot> channels;
+        double                       elapsed_s;
+    };
+
+    Snapshots collect_snapshots() const {
+        double elapsed_s = std::chrono::duration<double>(
+            clock_t::now() - start_time_).count();
+
+        std::vector<NodeSnapshot> nodes;
+        for (std::size_t i = 0; i < user_nodes_topo_.size(); ++i)
+            nodes.push_back(user_nodes_topo_[i]->node_snapshot(user_node_names_[i], elapsed_s));
+        for (std::size_t i = 0; i < fanout_nodes_ptr_.size(); ++i)
+            nodes.push_back(fanout_nodes_ptr_[i]->node_snapshot(fanout_node_names_[i], elapsed_s));
+
+        std::vector<ChannelSnapshot> channels;
+        for (auto& probe : channel_probes_)
+            channels.push_back(probe->snapshot());
+
+        return {std::move(nodes), std::move(channels), elapsed_s};
+    }
+
     std::string                                         name_;
     bool                                                stop_flag_{false};
     std::unique_ptr<FanoutStorage>                      fanouts_;
     std::vector<INode*>                                 user_nodes_topo_;
     std::vector<INode*>                                 fanout_nodes_ptr_;
-    std::vector<std::string>          user_node_names_;   // parallel to user_nodes_topo_
+    std::vector<std::string>                            user_node_names_;
+    std::vector<std::string>                            fanout_node_names_;
+    std::vector<std::unique_ptr<IChannelProbe>>         channel_probes_;
+    clock_t::time_point                                 start_time_;
+#ifdef KPN_WEB_DEBUG
+    uint16_t                                            web_debug_port_{9090};
+    std::unique_ptr<web_debug::WebDebugServer>          web_server_;
+#endif
 };
 
 // ── make_network ──────────────────────────────────────────────────────────────
@@ -203,27 +261,39 @@ auto make_network(Edges&&... edges) {
         return ptr;
     };
 
+    std::vector<std::unique_ptr<IChannelProbe>> channel_probes;
+
     auto wire_one = [&]<typename SE>(SE) {
         using SrcNode = typename SE::src_node_t;
         using DstNode = typename SE::dst_node_t;
+        using out_t   = std::tuple_element_t<SE::src_idx, typename SrcNode::return_tuple>;
         constexpr std::size_t SrcIdx = SE::src_idx;
         constexpr std::size_t DstIdx = SE::dst_idx;
 
         auto* src = find_node.template operator()<SrcNode>();
         auto* dst = find_node.template operator()<DstNode>();
-        if (src && dst)
+        if (src && dst) {
-            src->template set_output_channel<SrcIdx>(
+            auto& ch = dst->template input_channel<DstIdx>();
-                &dst->template input_channel<DstIdx>());
+            src->template set_output_channel<SrcIdx>(&ch);
+            std::string ch_name = node_display_name<SrcNode>() + ":" + std::to_string(SrcIdx)
+                                + " \xe2\x86\x92 "  // UTF-8 →
+                                + node_display_name<DstNode>() + ":" + std::to_string(DstIdx);
+            channel_probes.push_back(std::make_unique<ChannelProbe<out_t>>(ch, ch_name));
+        }
     };
 
     [&]<typename... SEs>(tmp::TypeList<SEs...>) {
         (wire_one(SEs{}), ...);
     }(ExpandedEdges{});
 
-    // 6. Collect fanout node pointers
+    // 6. Collect fanout node pointers and names
     std::vector<INode*>      fanout_ptrs;
+    std::vector<std::string> fanout_node_names;
     std::apply([&](auto&... fn) {
-        (fanout_ptrs.push_back(static_cast<INode*>(&fn)), ...);
+        ([&](auto& node) {
+            fanout_ptrs.push_back(static_cast<INode*>(&node));
+            fanout_node_names.push_back(node_display_name<std::decay_t<decltype(node)>>());
+        }(fn), ...);
     }, *fanout_storage);
 
     // 7. Construct and return the StaticNetwork
@@ -231,7 +301,9 @@ auto make_network(Edges&&... edges) {
     return Net(std::move(fanout_storage),
                std::move(user_node_ptrs),
                std::move(fanout_ptrs),
-               std::move(user_node_names));
+               std::move(user_node_names),
+               std::move(fanout_node_names),
+               std::move(channel_probes));
 }
 
 } // namespace kpn