add leonardo-meireles (zanfranceschi#1641)

* add leonardo_meireles

* add readme

participantes/leonardo-meireles/README.md

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+# Minha tentativa de participar da Rinha de Backend 2024.1
+
+### Leonardo Meireles - Quero-1-Emprego Edition
+
+Github: [@LeonardoMeireles55](https://github.com/LeonardoMeireles55)
+Repositório: [https://github.com/LeonardoMeireles55/rinha-backend-leonardo](https://github.com/LeonardoMeireles55/rinha-backend-leonardo)
+
+### Stack:
+- Java
+- Spring 
+- WebFlux
+- Postgres
+- Nginx

participantes/leonardo-meireles/config/nginx.conf

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+worker_processes auto;
+
+events {
+    worker_connections 1000;
+}
+
+http {
+    access_log off;
+    error_log off;
+    sendfile   on;
+
+    upstream api {
+        server api01:8080;
+        server api02:8080;
+    }
+
+    server {
+        listen 9999;
+
+        location / {
+            proxy_pass http://api;
+        }
+    }
+}

participantes/leonardo-meireles/docker-compose.yml

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+version: "3.8"
+
+services:
+  api01: &api
+    image: leonardomeireles55/rinha_backend:lastest
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    working_dir: /usr/src/app
+    hostname: api01
+    environment:
+      - SPRING_R2DBC_URL=r2dbc:postgresql://db:5432/rinha
+      - SPRING_R2DBC_USERNAME=admin
+      - SPRING_R2DBC_PASSWORD=123
+    ports:
+      - "8081:8080"
+    depends_on:
+      - db
+    deploy:
+     resources:
+       limits:
+         cpus: "0.58"
+         memory: "278MB"
+    restart: always
+  api02:
+    <<: *api
+    hostname: api02
+    ports:
+      - "8082:8080"
+    deploy:
+       resources:
+         limits:
+           cpus: "0.57"
+           memory: "140MB"
+  nginx:
+    image: nginx:latest
+    volumes:
+      - ./config/nginx.conf:/etc/nginx/nginx.conf:ro
+    depends_on:
+      - api01
+      - api02
+    ports:
+      - "9999:9999"
+    deploy:
+     resources:
+       limits:
+         cpus: "0.10"
+         memory: "32MB"
+  db:
+    image: postgres:latest
+    logging:
+      driver: none
+    hostname: db
+    environment:
+      - POSTGRES_DB=rinha
+      - POSTGRES_USER=admin
+      - POSTGRES_PASSWORD=123
+#    command: "postgres -c synchronous_commit=0 -c full_page_writes=0"
+    command: postgres -c checkpoint_timeout=600 -c max_wal_size=2096 -c synchronous_commit=0 -c full_page_writes=0 -c fsync=off -c check_function_bodies=false
+    ports:
+      - "5432:5432"
+    volumes:
+      - ./sql/script.sql:/docker-entrypoint-initdb.d/script.sql
+    deploy:
+     resources:
+       limits:
+         cpus: "0.25"
+         memory: "100MB"

participantes/leonardo-meireles/sql/script.sql

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+CREATE UNLOGGED TABLE cliente
+(
+    id     INT PRIMARY KEY,
+    limites INT NOT NULL,
+    saldos  INT NOT NULL
+);
+
+INSERT INTO cliente (id, limites, saldos)
+VALUES (1, 100000, 0),
+       (2, 80000, 0),
+       (3, 1000000, 0),
+       (4, 10000000, 0),
+       (5, 500000, 0);
+
+CREATE UNLOGGED TABLE TRANSACAO
+(
+    ID           SERIAL      PRIMARY KEY,
+    ID_CLIENTE   INT         NOT NULL,
+    VALOR        INT         NOT NULL,
+    TIPO         VARCHAR(1)  NOT NULL,
+    DESCRICAO    VARCHAR(10) NOT NULL,
+    REALIZADA_EM TIMESTAMP   NOT NULL
+);
+
+CREATE INDEX idx_transacao_id_cliente ON transacao (id_cliente);
+CREATE INDEX idx_transacao_id_cliente_realizada_em ON transacao (id_cliente, realizada_em DESC);
+
+
+CREATE OR REPLACE FUNCTION efetuar_transacao(
+clienteIdParam int,
+tipoParam varchar(1),
+valorParam int,
+descricaoParam varchar(10)
+)
+RETURNS TABLE (saldo int, limite int) AS $$
+DECLARE
+cliente cliente%rowtype;
+novoSaldo
+int;
+numeroLinhasAfetadas
+int;
+BEGIN
+PERFORM
+* FROM cliente where id = clienteIdParam FOR
+UPDATE;
+IF
+tipoParam = 'd' THEN
+novoSaldo := valorParam * -1;
+ELSE
+novoSaldo := valorParam;
+END IF;
+
+UPDATE cliente
+SET saldos = saldos + novoSaldo
+WHERE id = clienteIdParam
+  AND (novoSaldo > 0 OR limites * -1 <= saldos + novoSaldo) RETURNING *
+INTO cliente;
+
+GET DIAGNOSTICS numeroLinhasAfetadas = ROW_COUNT;
+
+IF
+numeroLinhasAfetadas = 0 THEN
+RAISE EXCEPTION '';
+END IF;
+
+INSERT INTO transacao (id_cliente, valor, tipo, descricao, realizada_em)
+VALUES (clienteIdParam, valorParam, tipoParam, descricaoParam, current_timestamp);
+
+
+RETURN QUERY SELECT cliente.saldos AS saldo, cliente.limites AS limite;
+END;
+$$
+LANGUAGE plpgsql;