Merge bitcoin/bitcoin#27636: kernel: Remove util/system from kernel library, interface_ui from validation.

7d3b35004b039f2bd606bb46a540de7babdbc41e refactor: Move system from util to common library (TheCharlatan)
7eee356c0a7fefd70c8de21689efa335f52a69ba refactor: Split util::AnyPtr into its own file (TheCharlatan)
44de325d95447498036479c3112ba741caf45bf6 refactor: Split util::insert into its own file (TheCharlatan)
9ec5da36b62276ae22e348f26f88aaf646357d6d refactor: Move ScheduleBatchPriority to its own file (TheCharlatan)
f871c69191dfe1331861ebcdbadb6bd47e45c8b1 kernel: Add warning method to notifications (TheCharlatan)
4452707edec91c7d7991f486dd41ef3edb4f7fbf kernel: Add progress method to notifications (TheCharlatan)
84d71457e7250ab25c0a11d1ad1c7657197ffd90 kernel: Add headerTip method to notifications (TheCharlatan)
447761c8228d58f948aae7e73ed079c028cacb97 kernel: Add notification interface (TheCharlatan)

Pull request description:

  This pull request is part of the `libbitcoinkernel` project https://github.com/bitcoin/bitcoin/issues/27587 https://github.com/bitcoin/bitcoin/projects/18 and more specifically its "Step 2: Decouple most non-consensus code from libbitcoinkernel".

  ---

  It removes the kernel library's dependency on `util/system` and `interface_ui`. `util/system` contains networking and shell-related code that should not be part of the kernel library. The following pull requests prepared `util/system` for this final step: https://github.com/bitcoin/bitcoin/pull/27419 https://github.com/bitcoin/bitcoin/pull/27254 https://github.com/bitcoin/bitcoin/pull/27238.

  `interface_ui` defines functions for a more general node interface and has a dependency on `boost/signals2`. After applying the patches from this pull request, the kernel's reliance on boost is down to `boost::multiindex`.

  The approach implemented here introduces some indirection, which makes the code a bit harder to read. Any suggestions for improving or reworking this pull request to make it more concise, or even reworking it into a more proper interface, are appreciated.

ACKs for top commit:
  MarcoFalke:
    re-ACK 7d3b35004b039f2bd606bb46a540de7babdbc41e (no change) 🎋
  stickies-v:
    Code Review ACK 7d3b35004b039f2bd606bb46a540de7babdbc41e
  hebasto:
    re-ACK 7d3b35004b039f2bd606bb46a540de7babdbc41e, only last two commits dropped since my [recent](https://github.com/bitcoin/bitcoin/pull/27636#pullrequestreview-1435394620) review.

Tree-SHA512: c8cfc698dc9d78e20191c444708f2d957501229abe95e5806106d1126fb9c5fbcee686fb55645658c0107ce71f10646f37a2fdf7fde16bbf22cbf1ac885dd08d

1 files changed, 26 insertions, 0 deletions

diff --git a/src/bitcoin-chainstate.cpp b/src/bitcoin-chainstate.cpp
index c143385d13..5678d4a526 100644
--- a/src/bitcoin-chainstate.cpp
+++ b/src/bitcoin-chainstate.cpp
@@ -12,6 +12,7 @@
 // It is part of the libbitcoinkernel project.
 
 #include <kernel/chainparams.h>
+#include <kernel/chainstatemanager_opts.h>
 #include <kernel/checks.h>
 #include <kernel/context.h>
 #include <kernel/validation_cache_sizes.h>
@@ -31,9 +32,12 @@
 #include <validationinterface.h>
 
 #include <cassert>
+#include <cstdint>
 #include <filesystem>
 #include <functional>
 #include <iosfwd>
+#include <memory>
+#include <string>
 
 int main(int argc, char* argv[])
 {
@@ -80,12 +84,34 @@ int main(int argc, char* argv[])
 
     GetMainSignals().RegisterBackgroundSignalScheduler(scheduler);
 
+    class KernelNotifications : public kernel::Notifications
+    {
+    public:
+        void blockTip(SynchronizationState, CBlockIndex&) override
+        {
+            std::cout << "Block tip changed" << std::endl;
+        }
+        void headerTip(SynchronizationState, int64_t height, int64_t timestamp, bool presync) override
+        {
+            std::cout << "Header tip changed: " << height << ", " << timestamp << ", " << presync << std::endl;
+        }
+        void progress(const bilingual_str& title, int progress_percent, bool resume_possible) override
+        {
+            std::cout << "Progress: " << title.original << ", " << progress_percent << ", " << resume_possible << std::endl;
+        }
+        void warning(const bilingual_str& warning) override
+        {
+            std::cout << "Warning: " << warning.original << std::endl;
+        }
+    };
+    auto notifications = std::make_unique<KernelNotifications>();
 
     // SETUP: Chainstate
     const ChainstateManager::Options chainman_opts{
         .chainparams = *chainparams,
         .datadir = gArgs.GetDataDirNet(),
         .adjusted_time_callback = NodeClock::now,
+        .notifications = *notifications,
     };
     const node::BlockManager::Options blockman_opts{
         .chainparams = chainman_opts.chainparams,