[taler-taler-mdb] 02/02: have script to show error diagnostics

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grothoff pushed a commit to branch master
in repository taler-mdb.

commit 9afe2f07bf4405aa4645bdaeb294d15c1c3f94a6
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sat Jan 13 15:26:44 2024 +0100

    have script to show error diagnostics
---
 Makefile.am                        |   8 +-
 configure.ac                       |   1 +
 contrib/Makefile.am                |   9 ++
 contrib/taler-mdb-network-check.sh | 187 +++++++++++++++++++++++++++++++++++++
 4 files changed, 199 insertions(+), 6 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 40e718c..151a99c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,10 +1,6 @@
-SUBDIRS = src .
+SUBDIRS = contrib src .
 
 EXTRA_DIST = \
-  AUTHORS \
-  contrib/uncrustify.cfg \
-  contrib/uncrustify_precommit
+  AUTHORS
 
 ACLOCAL_AMFLAGS = -I m4
-
-
diff --git a/configure.ac b/configure.ac
index 7732561..f26711d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -274,6 +274,7 @@ LIBS=$LIBS_SAVE
 
 
 AC_CONFIG_FILES([Makefile
+                 contrib/Makefile
                  src/Makefile])
 AC_OUTPUT
 
diff --git a/contrib/Makefile.am b/contrib/Makefile.am
new file mode 100644
index 0000000..ade84a2
--- /dev/null
+++ b/contrib/Makefile.am
@@ -0,0 +1,9 @@
+SUBDIRS = .
+
+bin_SCRIPTS = \
+  taler-mdb-network-check.sh
+
+EXTRA_DIST = \
+  $(bin_SCRIPTS) \
+  uncrustify.cfg \
+  uncrustify_precommit
diff --git a/contrib/taler-mdb-network-check.sh 
b/contrib/taler-mdb-network-check.sh
new file mode 100755
index 0000000..1c809e9
--- /dev/null
+++ b/contrib/taler-mdb-network-check.sh
@@ -0,0 +1,187 @@
+#!/bin/bash
+#
+# This file is part of TALER
+# Copyright (C) 2023, 2024 Taler Systems SA
+#
+# TALER is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or
+# (at your option) any later version.
+#
+# TALER is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public
+# License along with TALER; see the file COPYING.  If not, see
+# <http://www.gnu.org/licenses/>
+#
+# Author: Christian Grothoff
+#
+# Script to test for network connectivity, and if
+# successful launch some "main" application. If
+# the network goes down, stop the "main" application
+# and show an error message.
+#
+
+set -eu
+
+EXIT_STATUS=0
+CHILD_PID=-1
+
+# Exit, with error message (hard failure)
+function exit_fail() {
+    echo " FAILURE:" "$@" >&2
+    EXIT_STATUS=1
+    exit "$EXIT_STATUS"
+}
+
+CONF="$HOME/.config/taler.conf"
+FAIL_PROG="echo"
+
+# Parse command-line options
+while getopts ':c:f:ht:' OPTION; do
+    case "$OPTION" in
+        c)
+            CONF="$OPTARG"
+            ;;
+        f)
+            FAIL_PROG="$OPTARG"
+            ;;
+        h)
+            echo 'Supported options:'
+            # shellcheck disable=SC2016
+            echo '  -c $CONF     -- set configuration'
+            # shellcheck disable=SC2016
+            echo '  -f $CMD      -- command to run to display failures'
+            # shellcheck disable=SC2016
+            echo '  -t $HOSTNAME -- target hostname (required)'
+            ;;
+        t)
+            BACKEND_HOSTNAME="$OPTARG"
+            ;;
+        ?)
+            exit_fail "Unrecognized command line option"
+            ;;
+    esac
+done
+shift $((OPTIND - 1))
+
+if [[ "${BACKEND_HOSTNAME:-}" == "" ]]
+then
+    exit_fail "Specifying '-t' is required"
+fi
+
+dig -h > /dev/null || exit_fail "'dig' is required"
+
+
+# Cleanup to run whenever we exit
+function cleanup()
+{
+    echo "network-check terminating!" >&2
+
+    for n in $(jobs -p)
+    do
+        kill "$n" 2> /dev/null || true
+    done
+    wait
+    exit "$EXIT_STATUS"
+}
+
+# Function called with the short-hand of a detected
+# Failure. Stop our child (if any) and show it.
+function show_failure()
+{
+    if [ "$CHILD_PID" != "-1" ]
+    then
+        kill -TERM "$CHILD_PID"
+        wait
+        CHILD_PID="-1"
+    fi
+    ${FAIL_PROG} "$1" >&2
+}
+
+# Function to run when our child died.
+function childdeath()
+{
+    wait ${CHILD_PID}
+    CHILD_PID="-1"
+    show_failure child-died
+}
+
+# Install cleanup handler (except for kill -9)
+trap cleanup EXIT
+trap childdeath SIGCHLD
+
+# shellcheck disable=SC2120
+function check_network()
+{
+    DNS_HOST=$(grep nameserver /etc/resolv.conf | awk '{print $2}')
+    if ! ping -c1 "$DNS_HOST" &> /dev/null
+    then
+        show_failure no-ip
+        return
+    fi
+    if ! dig "$BACKEND_HOSTNAME" &> /dev/null
+    then
+        show_failure backend-dns-resolution-failure
+        return
+    fi
+    if ! ping -c1 "$BACKEND_HOSTNAME" &> /dev/null
+    then
+        show_failure backend-unreachable
+        return
+    fi
+
+    DEF_BACKEND=$(taler-config -c "$CONF" -s "taler-mdb" -o "BACKEND_BASE_URL")
+    if echo "$DEF_BACKEND" | grep "https://"; > /dev/null
+    then
+        if ! wget --no-check-certificate "${DEF_BACKEND}config" -O /dev/null 
&> /dev/null
+        then
+            show_failure backend-no-web-server
+            return
+        fi
+    fi
+
+    if ! wget "${DEF_BACKEND}config" -O /dev/null &> /dev/null
+    then
+        show_failure backend-x509-cert-bad
+        return
+    fi
+
+    HAVE_PRODUCT=0
+    for PS in $(taler-config -c "$CONF" -S | grep "product-" | head -n1)
+    do
+        URL=$(taler-config -c "$CONF" -s "$PS" -o "INSTANCE" 2> /dev/null || 
echo "$DEF_BACKEND")
+        AUTH=$(taler-config -c "$CONF" -s "$PS" -o "BACKEND_AUTHORIZATION")
+
+        if ! wget --header "Authorization: $AUTH" "${URL}private/orders" -O 
/dev/null &> /dev/null
+        then
+            echo "Failed to access backend for product '$PS'" >&2
+        else
+            HAVE_PRODUCT=1
+        fi
+    done
+    if [ "$HAVE_PRODUCT" = 0 ]
+    then
+        show_failure backend-auth-failure
+        return
+    fi
+    echo "Network OK, starting child"
+
+    if [ "${CHILD_PID}" = "-1" ]
+    then
+        # shellcheck disable=SC2068
+        $@ &
+        CHILD_PID=$!
+    fi
+}
+
+
+# Check network status
+while true
+do
+    check_network
+    sleep 30
+done

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