model: Log topic_id as base64

Signed-off-by: Ben Pope <[email protected]>

Author: BenPope

src/v/model/BUILD

@@ -71,6 +71,7 @@ redpanda_cc_library(
         "//src/v/serde:vector",
         "//src/v/ssx:sformat",
         "//src/v/strings:string_switch",
+        "//src/v/utils:base64",
         "//src/v/utils:move_canary",
         "//src/v/utils:named_type",
         "//src/v/utils:to_string",

src/v/model/fundamental.h

@@ -536,6 +536,7 @@ std::ostream& operator<<(std::ostream& os, const fips_mode_flag& f);
 std::istream& operator>>(std::istream& is, fips_mode_flag& f);
 
 using topic_id = named_type<uuid_t, struct topic_id_type>;
+std::ostream& operator<<(std::ostream&, const topic_id&);
 
 inline topic_id create_topic_id() { return topic_id{uuid_t::create()}; }
 
@@ -629,3 +630,10 @@ struct hash<model::ntp> {
 };
 
 } // namespace std
+
+template<>
+struct fmt::formatter<model::topic_id> final
+  : fmt::formatter<std::string_view> {
+    auto format(const model::topic_id& s, fmt::format_context& ctx) const
+      -> decltype(ctx.out());
+};

src/v/model/model.cc

@@ -10,6 +10,7 @@
 #include "absl/container/flat_hash_map.h"
 #include "absl/strings/numbers.h"
 #include "absl/strings/str_split.h"
+#include "bytes/bytes.h"
 #include "bytes/iobuf.h"
 #include "bytes/iobuf_parser.h"
 #include "model/compression.h"
@@ -24,6 +25,7 @@
 #include "serde/rw/sstring.h"
 #include "serde/serde_exception.h"
 #include "strings/string_switch.h"
+#include "utils/base64.h"
 #include "utils/to_string.h"
 
 #include <seastar/core/print.hh>
@@ -783,6 +785,11 @@ std::istream& operator>>(std::istream& is, fips_mode_flag& f) {
     return is;
 }
 
+std::ostream& operator<<(std::ostream& os, const topic_id& id) {
+    fmt::print(os, "{}", id);
+    return os;
+}
+
 topic_id_partition topic_id_partition::from(std::string_view s) {
     std::vector<ss::sstring> ss = absl::StrSplit(s, "/");
     if (ss.size() != 2) {
@@ -836,3 +843,10 @@ std::istream& operator>>(std::istream& i, kafka_batch_validation_mode& mode) {
 }
 
 } // namespace model
+
+auto fmt::formatter<model::topic_id>::format(
+  const model::topic_id& s, fmt::format_context& ctx) const
+  -> decltype(ctx.out()) {
+    bytes_view bv(s().uuid().begin(), s().uuid().size());
+    return fmt::format_to(ctx.out(), "{}", bytes_to_base64(bv));
+}