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Misleading 404 logs in IMDS mode when querying EC2 Metadata without a public IP #1058

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Misleading 404 logs in IMDS mode when querying EC2 Metadata without a public IP #1058

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xabinapal
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Description of changes:

While running NTH in IMDS mode on instances without an assigned public IP, I noticed that requests to certain EC2 Metadata endpoints, specifically public-hostname and public-ipv4, return a 404 status code. This is the expected behavior, as documented here. Although NTH does not fail and works as expected in this scenario, some log messages about these 404 status codes are displayed:

2024/08/29 13:42:34 INF Metadata response status code: 404. Body: <?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
		 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
  <title>404 - Not Found</title>
 </head>
 <body>
  <h1>404 - Not Found</h1>
 </body>
</html>

These messages don't clarify the reason for the 404 codes, which can mislead users (like myself!) into thinking something is wrong. To address this, I've added an allowMissing parameter to the GetMetadataInfo function. When this flag is enabled, no message will be logged for 404 responses, and no error will be returned.

While this might not be the most elegant solution, I felt like any other alternative, such as implementing the options pattern, would be overkill and too complex for the limited scope of the function.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

@xabinapal
assume public ip and hostname ec2 metadata can be absent
0752e31 
Signed-off-by: Xabier Napal <xabier.napal@dvzr.io>
@xabinapal
add ec2metadata new tests to check for optional paths
06cfba9 
Signed-off-by: Xabier Napal <xabier.napal@dvzr.io>
@xabinapal xabinapal requested a review from a team as a code owner August 29, 2024 20:43
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This PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you want this PR to never become stale, please ask a maintainer to apply the "stalebot-ignore" label.

@github-actions github-actions bot added the stale Issues / PRs with no activity label Sep 14, 2024
@LikithaVemulapalli LikithaVemulapalli removed the stale Issues / PRs with no activity label Sep 15, 2024
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This PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you want this PR to never become stale, please ask a maintainer to apply the "stalebot-ignore" label.

@github-actions github-actions bot added the stale Issues / PRs with no activity label Sep 30, 2024
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github-actions bot commented Oct 6, 2024

This PR was closed because it has become stale with no activity.

@github-actions github-actions bot closed this Oct 6, 2024
@Lu-David Lu-David removed the stale Issues / PRs with no activity label Oct 7, 2024
@Lu-David Lu-David reopened this Oct 7, 2024
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This PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you want this PR to never become stale, please ask a maintainer to apply the "stalebot-ignore" label.

@github-actions github-actions bot added the stale Issues / PRs with no activity label Oct 23, 2024
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This PR was closed because it has become stale with no activity.

@github-actions github-actions bot closed this Oct 29, 2024
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xabinapal commented Nov 1, 2024 •
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Could this be reviewed so it's not marked as stale by the bot?

@LikithaVemulapalli @Lu-David @steveshidev

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Hello @xabinapal, will take a look at this PR. Thanks for your contribution :)

@LikithaVemulapalli LikithaVemulapalli requested review from LikithaVemulapalli and removed request for steveshidev November 14, 2024 22:31
@github-actions github-actions bot removed the stale Issues / PRs with no activity label Nov 15, 2024
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@LikithaVemulapalli LikithaVemulapalli Awaiting requested review from LikithaVemulapalli

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@xabinapal @LikithaVemulapalli @Lu-David