Encap.txt/get-encap: Difference between revisions
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Handle errors returned from the portal API |
handle errors from jq |
||
| Line 6: | Line 6: | ||
The script maintains a cache, so it downloads the information only when it has changed. | The script maintains a cache, so it downloads the information only when it has changed. | ||
<nowiki> | <nowiki>#!/bin/bash | ||
#!/bin/bash | |||
# Output the current AMPRNet routing information, like this: | # Output the current AMPRNet routing information, like this: | ||
# # Fetched <when> version <number> from <source> | # # Fetched <when> version <number> from <source> | ||
| Line 56: | Line 55: | ||
exit 1 | exit 1 | ||
elif [ -r "$cache" ]; then | elif [ -r "$cache" ]; then | ||
oldVersion=`jq ".serial" "$cache"` || oldVersion="cache error $?" | oldVersion=`jq -e ".serial" "$cache"` || oldVersion="cache error $?" | ||
[ "$oldVersion" == "null" ] && oldVersion="N/A" # != $newVersion | [ "$oldVersion" == "null" ] && oldVersion="N/A" # != $newVersion | ||
newVersion=$( | newVersion=$( | ||
echo "$curlOptions" | curl --config - "$API"/encap/serial | jq ".serial" | echo "$curlOptions" | curl --config - "$API"/encap/serial | jq -e ".serial" | ||
allZero "${PIPESTATUS[@]}" || exit $? | allZero "${PIPESTATUS[@]}" || exit $? | ||
) || newVersion="API error $?" | ) || newVersion="API error $?" | ||
| Line 70: | Line 69: | ||
# Fetch new data from the API and store it in $cache: | # Fetch new data from the API and store it in $cache: | ||
newVersion=$( | newVersion=$( | ||
echo "$curlOptions" | curl --config - "$API"/encap/routes | tee "$cache" | jq ".serial" | echo "$curlOptions" | curl --config - "$API"/encap/routes | tee "$cache" | jq -e ".serial" | ||
allZero "${PIPESTATUS[@]}" || exit $? | allZero "${PIPESTATUS[@]}" || exit $? | ||
) || exit $? | ) || exit $? | ||
| Line 76: | Line 75: | ||
# Convert $cache to the output format: | # Convert $cache to the output format: | ||
echo "# Fetched" `date -r "$cache"` version "$newVersion" from "$API" || exit $? | echo "# Fetched" `date -r "$cache"` version "$newVersion" from "$API" || exit $? | ||
jq -r '.encap[] | select(.encapType == "IPIP") | "route addprivate \(.network)/\(.cidr) encap \(.gatewayIP)"'\ | jq -e -r '.encap[] | select(.encapType == "IPIP") | "route addprivate \(.network)/\(.cidr) encap \(.gatewayIP)"'\ | ||
"$cache" | sort | "$cache" | sort | ||
# Sorting the output makes it easier to compare different versions. | # Sorting the output makes it easier to compare different versions. | ||
allZero "${PIPESTATUS[@]}" || exit $? | allZero "${PIPESTATUS[@]}" || exit $? | ||
</nowiki> | </nowiki> | ||
Revision as of 19:42, 15 October 2024
Here's a bash script to get a complete encap.txt file from the portal. For example:
.\get-encap < api-token.txt > encap.txt || echo error $?
The script maintains a cache, so it downloads the information only when it has changed.
#!/bin/bash
# Output the current AMPRNet routing information, like this:
# # Fetched <when> version <number> from <source>
# route addprivate 44.0.1.0/32 encap 169.228.84.34
# route addprivate 44.102.240.16/28 encap 45.145.74.247
# ...
cache="${1:-routes.json}" # a file that stores previous information
token=`cat -` # an API token
# To obtain a token, register with http://portal.ampr.org/ , log in,
# browse your profile and copy the value of "API Token".
# Be sure to keep the token private. This script won't reveal it.
API="https://portal.ampr.org/api/v2"
# The API returns JSON, something like:
# {
# "count": 836,
# "serial": "136.269",
# "encap": [
# {
# "gatewayIP": "118.82.153.200",
# "encapType": "IPIP",
# "network": "44.147.0.210",
# "cidr": 25,
# ...
# },
# ...
# ]
# }
# ... but without any insignificant white space.
# We trust that any change will also change the serial value.
allZero () {
for status in "$@"; do
[ "$status" != 0 ] && return "$status"
done
return 0
}
curlOptions="-s
-S
-f
-H \"Authorization: Bearer $token\"
-H \"Accept: application/json\"
"
if [[ -e "$cache" && ! -f "$cache" ]]; then
echo >&2 `basename "$0"`": $cache isn't a regular file."
exit 1
elif [ -r "$cache" ]; then
oldVersion=`jq -e ".serial" "$cache"` || oldVersion="cache error $?"
[ "$oldVersion" == "null" ] && oldVersion="N/A" # != $newVersion
newVersion=$(
echo "$curlOptions" | curl --config - "$API"/encap/serial | jq -e ".serial"
allZero "${PIPESTATUS[@]}" || exit $?
) || newVersion="API error $?"
else
oldVersion="N/A" # != $newVersion
newVersion="TBD"
fi
# echo "# oldVersion=$oldVersion newVersion=$newVersion"
if [ "$newVersion" != "$oldVersion" ]; then
# Fetch new data from the API and store it in $cache:
newVersion=$(
echo "$curlOptions" | curl --config - "$API"/encap/routes | tee "$cache" | jq -e ".serial"
allZero "${PIPESTATUS[@]}" || exit $?
) || exit $?
fi
# Convert $cache to the output format:
echo "# Fetched" `date -r "$cache"` version "$newVersion" from "$API" || exit $?
jq -e -r '.encap[] | select(.encapType == "IPIP") | "route addprivate \(.network)/\(.cidr) encap \(.gatewayIP)"'\
"$cache" | sort
# Sorting the output makes it easier to compare different versions.
allZero "${PIPESTATUS[@]}" || exit $?