Idempotency

# Set SYSTEM_ZERO_API_KEY to your API key before running this example.
# Generate once per logical decision; reuse this key when retrying.
idempotency_key="$(uuidgen 2>/dev/null \
  || cat /proc/sys/kernel/random/uuid 2>/dev/null \
  || openssl rand -hex 16 2>/dev/null \
  || python3 -c 'from uuid import uuid4; print(uuid4())' 2>/dev/null)"
cat > request.json <<'EOF'
{
  "model": "system-zero",
  "state": "The blender I ordered arrived with a cracked jar.",
  "questions": {
    "damaged": {
      "type": "boolean",
      "instructions": "Did the item arrive damaged?"
    }
  }
}
EOF
# Headerless error responses require Python 3 to read error.code.
# If x-should-retry is present, resend only when x-should-retry is true. If the
# header is absent, resend on 429, or on 409 and 5xx only with a retryable
# error.code. No answer also retries. Wait Retry-After plus up to 10 %,
# otherwise a random wait doubling from 1 s to 30 s. Stop if Retry-After is over
# 60 s. Also stop when a 429 has no Retry-After, or a 5xx has x-should-retry but
# no Retry-After.
random() { od -An -N4 -tu4 /dev/urandom | tr -d ' '; }
# Stop resending after 10 minutes.
start=$(date +%s) attempt=0
while :; do
  : "${SYSTEM_ZERO_API_KEY:?set it first}"
  : "${idempotency_key:?could not make one}"
  rm -f reply.json
  out=$(curl https://api.rightnowai.co/v1/system-zero/decide \
    --max-time 130 -sS -o reply.json -D - -w '%{http_code}' \
    -H "Authorization: Bearer $SYSTEM_ZERO_API_KEY" \
    -H "Content-Type: application/json" \
    -H "Idempotency-Key: $idempotency_key" \
    -d @request.json)
  code=$(printf '%s' "$out" | tail -c 3)
  retry_header=$(printf '%s\n' "$out" \
    | grep -i '^x-should-retry:' | tail -n 1)
  retry=$(printf '%s\n' "$retry_header" \
    | sed 's/^[^:]*:[[:space:]]*//;s/[[:space:]]*$//')
  after=$(printf '%s\n' "$out" | grep -i '^retry-after:' \
    | tail -n 1 | sed 's/^[^:]*:[[:space:]]*//;s/[[:space:]]*$//')
  case $after in *[!0-9]*|'') after= ;; esac
  if [ -z "$retry_header" ]; then
    case $code in
      000|429) ;;
      409|5??)
        error_code=$(python3 -c 'import json, sys
try:
    print(json.load(sys.stdin).get("error", {}).get("code", ""))
except (ValueError, AttributeError):
    pass' < reply.json 2>/dev/null) || break
        case $code:$error_code in
          409:idempotency_conflict) ;;
          409:upload_in_use) ;;
          409:session_busy) ;;
          5??:service_unavailable) ;;
          5??:system_zero_unavailable) ;;
          5??:billing_settlement_error) ;;
          5??:idempotency_unavailable) ;;
          5??:limiter_unavailable) ;;
          5??:internal_error) ;;
          5??:maintenance) ;;
          5??:revoke_notice_unavailable) ;;
          *) break ;;
        esac ;;
      *) break ;;
    esac
  else
    [ "$retry" = true ] || break
    case $code in 4??|5??) ;; *) break ;; esac
  fi
  if [ -n "$after" ]; then
    after=$(printf '%s' "$after" | sed 's/^0*//')
    after=${after:-0}
    [ "$after" -le 60 ] || break
    ms=$(( after * 1000 + $(random) % (after * 100 + 1) ))
  else
    [ "$code" != 429 ] || break
    if [ -n "$retry_header" ]; then
      case $code in 5??) break ;; esac
    fi
    cap=$(( attempt < 5 ? 1000 << attempt : 30000 ))
    ms=$(( $(random) % (cap + 1) ))
  fi
  [ $(( $(date +%s) - start + ms / 1000 )) -lt 600 ] || break
  sleep "$(( ms / 1000 )).$(printf '%03d' $(( ms % 1000 )))"
  [ $(( $(date +%s) - start )) -lt 600 ] || break
  attempt=$(( attempt + 1 ))
done
echo "HTTP $code"
cat reply.json 2>/dev/null