Cardano blueprint localstate query tests

[ch1bo]

Explores how we could test the LocalStatQuery API that is being created in course of the blueprint initiative.

• This is adding a cardano-blueprint submodule from which local state query and result cbor examples are taken to test serialization roundtrips.

• Changes SystemStartResult to hold big.Int for Year and Picoseconds as the CDDL (and at least the Haskell server) are using unbounded integers

  type SystemStartResult struct {
      // Tells the CBOR decoder to convert to/from a struct and a CBOR array
      _           struct{} `cbor:",toarray"`
      Year        big.Int
      Day         int
      Picoseconds big.Int
  }

  • This required a few additional custom methods on SystemStartResult to make roundtrips work. Happy for some feedback in how to improve / avoid those changes.

[agaffney]

That failing test you noted is due to pointer vs. non-pointer in the DeepEqual() comparison

[agaffney]

@ch1bo it took a bit of playing around, but I figured out how to fix the test failure. Reflection is fun!

diff --git a/protocol/localstatequery/messages_test.go b/protocol/localstatequery/messages_test.go
index 4156f5f..cbe1fba 100644
--- a/protocol/localstatequery/messages_test.go
+++ b/protocol/localstatequery/messages_test.go
@@ -135,10 +135,10 @@ func TestDecode(t *testing.T) {
                        if err != nil {
                                t.Fatalf("failed to decode result: %s", err)
                        }
-                       if !reflect.DeepEqual(decoded.Interface(), test.Result) {
+                       if !reflect.DeepEqual(reflect.Indirect(decoded).Interface(), test.Result) {
                                t.Fatalf(
                                        "MsgResult content did not decode to expected Result object\n  got:    %#v\n  wanted: %#v",
-                                       decoded.Interface(),
+                                       reflect.Indirect(decoded).Interface(),
                                        test.Result,
                                )
                        }

[ch1bo]

Squashed into a single commit following https://www.conventionalcommits.org/en/v1.0.0/ as suggested by @wolf31o2. Only found these contributing guidelines using the github UI. Originally I was looking for a CONTRIBUTING.md in the repo but did not find one.

[wolf31o2]

Thanks for the contribution. We had per-repo contributing files, but they were redundant to maintain, especially remembering them in new repos. I'll look at adding them back to each repo.

[wolf31o2]

I have no idea why this is still not processing on the GitHub side. Since it's acting so weird, I decided to make a new branch, cherry-pick your changes, rebase them on main, and add json struct tags to make golangci-lint happy.

The pull request in #1001 replaces this one.