Refactor to reuse dig command and improve maintainability #37
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📝 WalkthroughWalkthroughThe pull request introduces a new array variable Changes
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Actionable comments posted: 1
🧹 Nitpick comments (1)
chkdm (1)
58-59: LGTM! Good refactoring to centralize the dig command.The introduction of
dig_commandarray improves maintainability by centralizing the command configuration.Consider adding a comment explaining the purpose and expected format of the array:
+# Array containing dig command and its default options dig_command=(dig +short)
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chkdm(3 hunks)
🔇 Additional comments (2)
chkdm (2)
104-104: LGTM! Proper array usage.The array expansion is correctly implemented using
"${dig_command[@]}".
111-111: LGTM! Consistent implementation in the query function.The array expansion is correctly implemented and maintains the existing error handling capabilities.
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| function warnUpDNS() { | ||
| echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | xargs -I{} -P5 dig +short "$domain" @{} > /dev/null 2>&1 & | ||
| echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | xargs -I{} -P5 "${dig_command[@]}" "$domain" @{} > /dev/null 2>&1 & |
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🛠️ Refactor suggestion
Improve array handling in parallel execution.
While the array expansion is correct, the current implementation might have issues if the dig command contains spaces or special characters when used with xargs.
Consider restructuring the command to handle the array expansion more safely:
- echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | xargs -I{} -P5 "${dig_command[@]}" "$domain" @{} > /dev/null 2>&1 &
+ echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | while read -r dns; do
+ "${dig_command[@]}" "$domain" "@$dns" > /dev/null 2>&1 &
+ # Limit concurrent processes
+ while [ "$(jobs -r | wc -l)" -ge 5 ]; do
+ sleep 0.1
+ done
+ doneThis approach:
- Safely handles array expansion
- Maintains parallel execution limit
- Properly handles DNS servers with special characters
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| echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | xargs -I{} -P5 "${dig_command[@]}" "$domain" @{} > /dev/null 2>&1 & | |
| echo "${nofilterDNS[*]} ${secureDNS[*]} ${adblockDNS[*]}" | sed 's/ /\n/g' | while read -r dns; do | |
| "${dig_command[@]}" "$domain" "@$dns" > /dev/null 2>&1 & | |
| # Limit concurrent processes | |
| while [ "$(jobs -r | wc -l)" -ge 5 ]; do | |
| sleep 0.1 | |
| done | |
| done |
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I don't think there will be special characters, and currently, it does contain a space, but it also works as expected. Is there something wrong?
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@PeterDaveHello You're right. I apologize for the overly cautious suggestion. The current implementation is working correctly because:
- The array expansion
"${dig_command[@]}"properly handles the space indig +short - The xargs usage with
-I{}safely handles the DNS server parameter - The parallel execution with
-P5works as intended
The suggested change would add unnecessary complexity without providing tangible benefits. Let's keep the current implementation.
✏️ Learnings added
Learnt from: PeterDaveHello
PR: PeterDaveHello/chkdomain#37
File: chkdm:191-191
Timestamp: 2025-01-14T16:38:18.403Z
Learning: The parallel DNS query implementation in chkdomain using `xargs -I{} -P5` with array expansion `"${dig_command[@]}"` works correctly for handling spaces in the dig command and DNS server parameters. The suggestion to use a while loop with jobs control would add unnecessary complexity.
Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.
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Summary by CodeRabbit
digcommand variable.