Swarm MRUs: Adaptive frequency / Predictable lookups / API simplification (#17559)

* swarm/storage/mru: Adaptive Frequency

swarm/storage/mru/lookup: fixed getBaseTime
Added NewEpoch constructor

swarm/api/client: better error handling in GetResource()


swarm/storage/mru: Renamed structures.
Renamed ResourceMetadata to ResourceID. 
Renamed ResourceID.Name to ResourceID.Topic

swarm/storage/mru: Added binarySerializer interface and test tools

swarm/storage/mru/lookup: Changed base time to time and + marshallers

swarm/storage/mru:  Added ResourceID (former resourceMetadata)

swarm/storage/mru: Added ResourceViewId and serialization tests

swarm/storage/mru/lookup: fixed epoch unmarshaller. Added Epoch Equals

swarm/storage/mru: Fixes as per review comments

cmd/swarm: reworded resource create/update help text regarding topic

swarm/storage/mru: Added UpdateLookup and serializer tests

swarm/storage/mru: Added UpdateHeader, serializers and tests

swarm/storage/mru: changed UpdateAddr / epoch to Base()

swarm/storage/mru: Added resourceUpdate serializer and tests

swarm/storage/mru: Added SignedResourceUpdate tests and serializers

swarm/storage/mru/lookup: fixed GetFirstEpoch bug

swarm/storage/mru: refactor, comments, cleanup

Also added tests for Topic
swarm/storage/mru: handler tests pass

swarm/storage/mru: all resource package tests pass

swarm/storage/mru: resource test pass after adding
timestamp checking support

swarm/storage/mru: Added JSON serializers to ResourceIDView structures

swarm/storage/mru: Sever, client, API test pass

swarm/storage/mru: server test pass

swarm/storage/mru: Added topic length check

swarm/storage/mru: removed some literals,
improved "previous lookup" test case

swarm/storage/mru: some fixes and comments as per review

swarm/storage/mru: first working version without metadata chunk

swarm/storage/mru: Various fixes as per review

swarm/storage/mru: client test pass

swarm/storage/mru: resource query strings and manifest-less queries


swarm/storage/mru: simplify naming

swarm/storage/mru: first autofreq working version



swarm/storage/mru: renamed ToValues to AppendValues

swarm/resource/mru: Added ToValues / FromValues for URL query strings

swarm/storage/mru: Changed POST resource to work with query strings.
No more JSON.

swarm/storage/mru: removed resourceid

swarm/storage/mru: Opened up structures

swarm/storage/mru: Merged Request and SignedResourceUpdate

swarm/storage/mru: removed initial data from CLI resource create

swarm/storage/mru: Refactor Topic as a direct fixed-length array

swarm/storage/mru/lookup: Comprehensive GetNextLevel tests

swarm/storage/mru: Added comments

Added length checks in Topic
swarm/storage/mru: fixes in tests and some code comments

swarm/storage/mru/lookup: new optimized lookup algorithm

swarm/api: moved getResourceView to api out of server

swarm/storage/mru: Lookup algorithm working

swarm/storage/mru: comments and renamed NewLookupParams

Deleted commented code


swarm/storage/mru/lookup: renamed Epoch.LaterThan to After

swarm/storage/mru/lookup: Comments and tidying naming



swarm/storage/mru: fix lookup algorithm

swarm/storage/mru: exposed lookup hint
removed updateheader

swarm/storage/mru/lookup: changed GetNextEpoch for initial values

swarm/storage/mru: resource tests pass

swarm/storage/mru: valueSerializer interface and tests



swarm/storage/mru/lookup: Comments, improvements, fixes, more tests

swarm/storage/mru: renamed UpdateLookup to ID, LookupParams to Query

swarm/storage/mru: renamed query receiver var



swarm/cmd: MRU CLI tests

* cmd/swarm: remove rogue fmt

* swarm/storage/mru: Add version / header for future use

* swarm/storage/mru: Fixes/comments as per review

cmd/swarm: remove rogue fmt

swarm/storage/mru: Add version / header for future use-

* swarm/storage/mru: fix linter errors

* cmd/swarm: Speeded up TestCLIResourceUpdate

1 files changed, 57 insertions, 0 deletions

diff --git a/swarm/storage/mru/lookup/epoch_test.go b/swarm/storage/mru/lookup/epoch_test.go
new file mode 100644
index 000000000..8c63ec6c2
--- /dev/null
+++ b/swarm/storage/mru/lookup/epoch_test.go
@@ -0,0 +1,57 @@
+package lookup_test
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/swarm/storage/mru/lookup"
+)
+
+func TestMarshallers(t *testing.T) {
+
+	for i := uint64(1); i < lookup.MaxTime; i *= 3 {
+		e := lookup.Epoch{
+			Time:  i,
+			Level: uint8(i % 20),
+		}
+		b, err := e.MarshalBinary()
+		if err != nil {
+			t.Fatal(err)
+		}
+		var e2 lookup.Epoch
+		if err := e2.UnmarshalBinary(b); err != nil {
+			t.Fatal(err)
+		}
+		if e != e2 {
+			t.Fatal("Expected unmarshalled epoch to be equal to marshalled onet.Fatal(err)")
+		}
+	}
+
+}
+
+func TestAfter(t *testing.T) {
+	a := lookup.Epoch{
+		Time:  5,
+		Level: 3,
+	}
+	b := lookup.Epoch{
+		Time:  6,
+		Level: 3,
+	}
+	c := lookup.Epoch{
+		Time:  6,
+		Level: 4,
+	}
+
+	if b.After(a) != true {
+		t.Fatal("Expected 'after' to be true, got false")
+	}
+
+	if b.After(b) != false {
+		t.Fatal("Expected 'after' to be false when both epochs are identical, got true")
+	}
+
+	if b.After(c) != true {
+		t.Fatal("Expected 'after' to be true when both epochs have the same time but the level is lower in the first one, but got false")
+	}
+
+}