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Shell logging to Slack Webhook
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| #!/bin/bash | |
| ####################################### | |
| # Send log message to Slack channel via Webhook. | |
| # | |
| # @author Yuriy Belenko <[email protected]> | |
| # This functions requires jo package installed. https://github.com/jpmens/jo | |
| # | |
| # Originally developed as almost zero dependency(jo only) alternative of Slack Monolog PHP handler: | |
| # https://github.com/Seldaek/monolog/blob/main/src/Monolog/Handler/SlackWebhookHandler.php | |
| # | |
| # Ref to Slack webhook doc: https://api.slack.com/messaging/webhooks | |
| # Globals: | |
| # SLACK_WEBHOOK | |
| # Arguments: | |
| # $1 message | |
| # $2 (optional) log level, eg DEBUG or code equivalent 100 | |
| # Returns: | |
| # nothing if message has been sent, non-zero on error. | |
| ####################################### | |
| function slack_log() { | |
| local level='DEBUG' color='#e3e4e6' payload attachment log_level_field timestamp | |
| timestamp=$(date +%s) | |
| if [[ -z "${SLACK_WEBHOOK}" ]]; then | |
| echo "Error: SLACK_WEBHOOK constant required for slack_log" >&2 | |
| return 1 | |
| fi | |
| if [[ -z "$1" ]]; then | |
| echo 'Error: at least one argument requred in slack_log()' >&2 | |
| return 1 | |
| fi | |
| if [[ -n "$2" ]]; then | |
| # log level specified | |
| case "$2" in | |
| DEBUG | 100) | |
| level='DEBUG' | |
| color='#e3e4e6' | |
| ;; | |
| INFO | 200) | |
| level='INFO' | |
| color='good' | |
| ;; | |
| NOTICE | 250) | |
| level='NOTICE' | |
| color='good' | |
| ;; | |
| WARNING | 300) | |
| level='WARNING' | |
| color='warning' | |
| ;; | |
| ERROR | 400) | |
| level='ERROR' | |
| color='danger' | |
| ;; | |
| CRITICAL | 500) | |
| level='CRITICAL' | |
| color='danger' | |
| ;; | |
| ALERT | 550) | |
| level='ALERT' | |
| color='danger' | |
| ;; | |
| EMERGENCY | 600) | |
| level='EMERGENCY' | |
| color='danger' | |
| ;; | |
| *) | |
| echo 'Error: Invalid log level in slack_log()' >&2 | |
| return 1 | |
| ;; | |
| esac | |
| fi | |
| log_level_field=$(jo title="Level" value="${level}" short@0) | |
| attachment=$(jo title="Message" fallback="$1" text="$1" color="${color}" fields[]="${log_level_field}" mrkdwn_in="fields" ts="${timestamp}") | |
| payload=$(jo attachments[]="${attachment}") | |
| curl --request POST \ | |
| --url "${SLACK_WEBHOOK}" \ | |
| --header 'Content-type: application/json' \ | |
| --data "${payload}" | |
| } |
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