Monitor a Payment

Monitor /tmp/mywallet/transactions

#!/bin/bash
WATCHDIR="/tmp/mywallet/transactions"

known=""

# Function to handle reading from a pipe
read_pipe() {
    local dir="$1"
    local file="$2"
    local amount

    # Set timeout for cat command (125 minutes)
    if ! amount=$(timeout 125m cat "${dir}/${file}"); then
        # Handle timeout - write to syslog and exit
        echo "Timeout occurred while reading from $file" >&2
        logger "Timeout occurred while reading from $file"
        exit 1
    fi

    echo "Received from $file: $amount"
}

while true; do
    for fifo in $(find "$WATCHDIR" -type p 2>/dev/null); do
        if [[ ! "$known" =~ "$fifo" ]]; then
            echo "New transaction detected: $fifo"
            known="$known $fifo"
            (
                read_pipe "$(dirname "$fifo")" "$(basename "$fifo")"
            ) &
        fi
    done
    sleep 1
done

Monitor /tmp/mywallet/txid

#!/bin/bash

TX="/tmp/mywallet/transactions"
FIFO="/tmp/mywallet/txid"

echo "Waiting for incoming transaction in $FIFO ..."

while true; do
    if read -r txid address <"$FIFO"; then
        piconero=$(cat "$TX/$txid/$address")
        x=$(echo $piconero 1000000000000 | awk '{ printf "%.12f\n", $1 / $2 }')
        echo "Received $x XMR"
    fi
done

Monitor /tmp/mywallet/double_spend_alert

#!/bin/bash

FIFO="/tmp/mywallet/double_spend_alert"

echo "Waiting for alert in $FIFO ..."

while true; do
    if read -r txid address <"$FIFO"; then
        echo "Alert at: $txid $address"
    fi
done

Monitor /tmp/mywallet/rpc_connection_alert

FIFO="/tmp/mywallet/rpc_connection_alert"
MNP="/usr/local/bin/mnp"

while true; do
    if read -r txid < "$FIFO"; then
        printf '%s\n' "$txid" |
            "$MNP" --retry --notify-at 1
    fi
done

Named Pipes Interface

mnp exposes transaction state and alert events through POSIX FIFOs using a small, line-oriented interface designed for direct consumption by standard Unix tools and shell scripts.

Entry	Content	Meaning
txid	TXID (PAYMENT_ID | ADDRESS)	Processed transaction and identifier/address
rpc_connection_alert	TXID	Wallet RPC communication failed for the transaction
double_spend_alert	TXID (PAYMENT_ID | ADDRESS)	A double-spend condition was reported
transactions/<TXID>/<PAYMENT_ID|ADDRESS>	AMOUNT	Received amount in Monero atomic units

cat /tmp/mywallet/txid

cat /tmp/mywallet/rpc_connection_alert

find /tmp/mywallet/transactions -type p -exec cat {} \;

mnp --retry < /tmp/mywallet/rpc_connection_alert