Problems solved. Decisions explained.

Context

OpenTibiaBR Canary is a large C++/Lua online server runtime where startup touches scripts, map data, tile caches, spawn configuration, and runtime registries.

Problem

Startup had expensive hot paths that slowed iteration and operational startup.

Solution

Optimized Lua loading, map parsing, tile cache construction, zone indexing, and spawn startup without changing expected runtime behavior.

Impact

Script/module loading dropped from about 54 seconds to roughly 1.5-3.0 seconds in public PR measurements.

TechnologiesC++ · Lua · profiling · server runtime

Context

A long-running C++ server runtime must keep player-visible input and movement responsive while processing expensive background pathfinding, target selection, combat preparation, maintenance, and asynchronous work.

Problem

Broad dispatcher queues allowed large background workloads to compete with latency-sensitive work, while repeated asynchronous tasks, stale decisions, ownership churn, and unbounded fanout limited fairness and multi-core utilization.

Solution

Introduced lane-aware scheduling, adaptive runtime budgets, bounded multi-core compute, immutable navigation snapshots, visibility-aware promotion, coalescing, queue telemetry, and strict stale-completion validation.

Impact

Improved runtime behavior and player-visible responsiveness under monster-heavy workloads. The architecture passed 264 unit and regression tests and has been field validated across multiple OT server deployments while broader operational feedback continues.

TechnologiesC++ · concurrency · weighted deficit round robin · bounded queues · immutable snapshots · runtime telemetry

Context

A C++ client/server runtime needed to support modern 15.x, old-protocol 11.00, and compatible 8.60 client families without separate binaries, ports, or fragile version checks spread across the protocol stack.

Problem

The client families differ in TCP framing, checksums, encryption layout, compression, handshake behavior, login payloads, asset signatures, item mapping, and version-specific message fields.

Solution

Implemented transport codecs, initial-connection behavior, runtime protocol profiles, session hints, version-gated payload contracts, compatibility tests, legacy asset export profiles, and coordinated client release packaging.

Impact

Three client families now share one field-validated C++ runtime and deployment model without requiring per-version ports or server builds.

TechnologiesC++ · TCP framing · XTEA · checksums · compression · protocol profiles · feature flags · unit tests

Context

Some C++ package-manager and cross-build workflows use a host protoc while target packages only need protobuf::libprotobuf-lite.

Problem

The target-side Protobuf package could still pay build and install cost for full runtime and compiler-side artifacts that the target dependency graph did not need.

Solution

Implemented upstream Protobuf CMake support for a constrained lite-only runtime build and contributed the vcpkg port change that makes libprotoc opt-in for non-native target builds.

Impact

The Protobuf change landed through Copybara as public commit 7c090172. The local PoC measured the build step dropping from 508.063s to 55.648s and installed footprint from 113,754 KB to 21,579 KB.

TechnologiesCMake · vcpkg · Protocol Buffers · package management · cross-builds

Context

Market, inbox, and offline-save flows need strong item and persistence invariants. Small mistakes can duplicate items, lose items, or overwrite valid player progression.

Problem

Full inboxes, stack splitting, partial insertions, market clone behavior, and partial offline-player saves had edge cases where mutation order could corrupt state.

Solution

Hardened inbox and market insertion paths with capacity checks, safer cloning/insertion behavior, batch insertion helpers, and offline save protections.

Impact

Reduced risk of duplicated/ghost items, item loss, and progression resets in economy and persistence flows.

TechnologiesC++ · SQL persistence · inventory containers · data safety · tests

Context

A large C++/Lua runtime loads mutually exclusive content profiles containing Lua scripts, XML registrations, protobuf-backed item definitions, storages, actions, movements, weapons, spells, monsters, and NPCs.

Problem

Cross-profile definitions could incorrectly satisfy each other, dynamic Lua expressions could be mistaken for authoritative references, invalid XML ranges could be silently skipped at runtime, and naive whole-repository scans produced noisy or unsafe results.

Solution

Built a deterministic profile-aware auditor that produces typed symbol registries, reference reports, unresolved coverage, stable fingerprints, CI annotations, and JSON/Markdown artifacts validated against bundled schemas.

Impact

Scanned 39,311 facts across two runtime profiles, corrected eight blocking content errors, reduced storage findings from 1,225 to 405 by removing false positives, and completed 72 tests with zero remaining scan errors.

TechnologiesPython · Lua analysis · XML · Protocol Buffers · JSON Schema · static analysis · GitHub Actions

Context

Client delivery needed to support modern and legacy asset sets, server-specific modules, public launcher downloads, catalog visibility, operational monitoring, and versioned update metadata without exposing private implementation details.

Problem

Partner distribution was not a single-download problem. Different servers and client versions needed isolated asset trees, module sets, launch goals, update cadence, archive selection, catalog integrity, news, monitoring, and delivery rules through one controlled public entry point.

Solution

Integrated client asset automation, launcher/API delivery flows, version-aware archives, catalog validation, server-specific asset/module loading, partner rules, admin monitoring, news APIs, signed metadata, and release support.

Impact

Gives players and operators a controlled download/update path while preventing version-mismatched packages, repairing 11 spritesheet collisions, and preserving separation between server-specific packages and confidential partner operations.

TechnologiesC++ · Lua · Go · asset delivery · catalog integrity · launcher/API · release operations · monitoring

Context

Remere's Map Editor is a long-lived C++ desktop tool used to inspect, edit, load, save, render, and export large map/client-asset data sets.

Problem

Large-map workflows were paying too much allocation, traversal, binary I/O, save-path, repaint-invalidation, and generated asset export cost.

Solution

Added pooled allocation, cached floor/tile lookups, improved binary I/O, optimized save traversal, reduced unnecessary repaint work, and added large map asset export support.

Impact

Public PR metrics report slab refills dropping from 17,830 to 2,230, allocation CPU share dropping from 20.01% to 14.62%, and static viewport sampled CPU dropping from 139,767 to 126.

TechnologiesC++ · allocator work · binary I/O · rendering · Protocol Buffers