# HAProxy for DIDI PostgreSQL HA — routes by Patroni REST health checks.
# Mirrors the production LB config (10.11.50.166/169 → VIP 167).
#
#   :5000 → the ONE node whose Patroni answers 200 on /primary (leader, RW)
#   :5001 → nodes answering 200 on /replica (round-robin, RO)
#
# On failover Patroni flips the health endpoints; HAProxy reroutes in
# (inter × fall) ≈ 9s worst case without client config changes.

global
    maxconn 300
    log stdout format raw local0

defaults
    log global
    mode tcp
    retries 2
    timeout client 30m
    timeout connect 4s
    timeout server 30m
    timeout check 5s

listen stats
    mode http
    bind *:7000
    stats enable
    stats uri /

listen postgres_write
    bind *:5000
    option httpchk GET /primary
    http-check expect status 200
    default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
    server pg-node1 pg-node1:5432 check port 8008
    server pg-node2 pg-node2:5432 check port 8008
    server pg-node3 pg-node3:5432 check port 8008

listen postgres_read
    bind *:5001
    balance roundrobin
    option httpchk GET /replica
    http-check expect status 200
    default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
    server pg-node1 pg-node1:5432 check port 8008
    server pg-node2 pg-node2:5432 check port 8008
    server pg-node3 pg-node3:5432 check port 8008