adicionando arquivos da primeira submissão em go

participantes/samluiz/README.md

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+# Rinha de Backend 2024-Q1
+
+### Samuel Luiz
+
+Github: [@samluiz](https://github.com/samluiz)
+
+Twitter: [@real_vvs_](https://twitter.com/real_vvs_)
+
+LinkedIn: [@samuelluizrl](https://www.linkedin.com/in/samuelluizrl)
+
+Repositório: [https://github.com/samluiz/concurrency-control](https://github.com/samluiz/concurrency-control)
+
+---
+
+Menção honrosa ao [repositório do @zebaroni](https://github.com/zebaroni/rinha-backend-2024-q1), me inspirei nele pra aplicar algumas otimizações que eu não conhecia
+
+
+### Stack: Go com Postgres (muito criativo)
+- Go + Fiber + Pgx
+- Postgres
+- Nginx 

participantes/samluiz/db/init.sql

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+CREATE TABLE IF NOT EXISTS clientes (
+			id SERIAL PRIMARY KEY,
+			limite INT,
+			saldo INT DEFAULT 0
+		);
+
+CREATE TABLE IF NOT EXISTS transacoes (
+			id SERIAL PRIMARY KEY,
+			valor INT,
+			tipo CHAR(1),
+			descricao VARCHAR(10),
+			realizada_em TIMESTAMP,
+			id_cliente INT
+		);
+
+DO $$
+BEGIN
+  IF NOT EXISTS (SELECT * FROM clientes WHERE id BETWEEN 1 AND 5) THEN
+    INSERT INTO clientes (limite) 
+			VALUES 
+			(1000 * 100),
+			(800 * 100),
+			(10000 * 100),
+			(100000 * 100),
+			(5000 * 100);
+  END IF;
+END;
+$$;

participantes/samluiz/db/postgresql.conf

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+listen_addresses = '*'
+max_connections = 250
+superuser_reserved_connections = 3
+unix_socket_directories = '/var/run/postgresql'
+shared_buffers = 512MB
+work_mem = 4MB
+maintenance_work_mem = 256MB
+effective_cache_size = 1GB
+wal_buffers = 64MB
+checkpoint_completion_target = 0.9
+random_page_cost = 4.0
+effective_io_concurrency = 10
+autovacuum = on
+log_statement = 'none'
+log_duration = off
+log_lock_waits = off
+log_error_verbosity = terse
+log_min_messages = panic
+log_min_error_statement = panic
+synchronous_commit=off

participantes/samluiz/docker/docker-compose.yaml

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+version: "3.5"
+
+services:
+  api01: &api
+    image: samluiz/concurrency-control
+    hostname: api01
+    restart: unless-stopped
+    environment:
+      - DATABASE_URL=postgres://postgres:postgres@db:5432/bank
+      - SERVER_PORT=3000
+    ports:
+      - "3001:3000"
+    depends_on:
+      db:
+        condition: service_healthy
+    deploy:
+      resources:
+        limits:
+          cpus: "0.25"
+          memory: "100MB"
+
+  api02:
+    <<: *api
+    hostname: api02
+    ports:
+      - "3002:3000"
+
+  nginx:
+    image: nginx:latest
+    volumes:
+      - ../nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+    depends_on:
+      - api01
+      - api02
+    ports:
+      - "9999:9999"
+    deploy:
+      resources:
+        limits:
+          cpus: "0.2"
+          memory: "50MB"
+
+  db:
+    image: postgres:latest
+    hostname: db
+    restart: unless-stopped
+    environment:
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_USER=postgres
+      - POSTGRES_DB=bank
+      - PGUSER=postgres
+    ports:
+      - "5432:5432"
+      - "2345:5432"
+    volumes:
+      - ../db/init.sql:/docker-entrypoint-initdb.d/init.sql
+      - ../db/postgresql.conf:/docker-entrypoint-initdb.d/postgresql.conf
+    healthcheck:
+      test: ["CMD", "pg_isready", "-h", "db", "-p", "5432", "-q"]
+      interval: 10s
+      timeout: 5s
+      retries: 5 
+    command: postgres -c config_file=/docker-entrypoint-initdb.d/postgresql.conf
+    deploy:
+      resources:
+        limits:
+          cpus: "0.8"
+          memory: "300MB"
+
+networks:
+  default:
+    driver: bridge
+    name: concurrency-control

participantes/samluiz/nginx/nginx.conf

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+events {
+    worker_connections 1000;
+}
+
+http {
+    access_log off;
+
+    upstream api {
+        server api01:3000;
+        server api02:3000;
+    }
+
+    server {
+        http2 on;
+	    gzip on;
+		listen 9999;
+
+		location / {
+			proxy_pass http://api;
+		}
+	}
+}