refactor: snmp to use gosmi #9518

MyaLongmire · 2021-07-19T16:09:58Z

Required for all PRs:

Updated associated README.md.
Wrote appropriate unit tests.

resolves #3784
resolves #6450
resolves #5720

No longer calls snmptranslate and parses the output. Now it relies on gosmi library to parse mib files directly to increase performance. Moved all gosmi code into internal/snmp

plugins/inputs/snmp/snmp.go

plugins/inputs/snmp/snmp_test.go

telegraf-tiger · 2021-09-23T15:21:28Z

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henriknoerr · 2021-10-11T09:07:59Z

I am unsure of the progress of this PR - is it only the tests missing?
Our telegraf environment is at a state where we have +15 minutes reload time of the agents.
If it is only tests I'll cherrypick this PR and go from there.

Hipska · 2021-10-11T09:33:11Z

@henriknoerr did you also test how long it takes to startup alone?

The reason I'm asking is because if you have lots of unresponding snmp devices, it takes a while for telegraf to shut down since it will wait for timeouts and retries on those..

henriknoerr · 2021-10-11T09:42:25Z

@henriknoerr did you also test how long it takes to startup alone?

I did not know the shutdown process waited for all timeouts - I will look into this.
Thanks

henriknoerr · 2021-10-11T21:24:41Z

@henriknoerr did you also test how long it takes to startup alone?

The reason I'm asking is because if you have lots of unresponding snmp devices, it takes a while for telegraf to shut down since it will wait for timeouts and retries on those..

And yes indeed, I was blinded by this snmp MIB PR. Fixing retries and timeout values made a huge difference.
Thank you for pointing me in the right direction.

plugins/inputs/snmp/snmp_test.go

plugins/inputs/snmp/snmp.go

MyaLongmire · 2021-10-12T15:04:45Z

If a node can't be translated it gives an error. For example translating: Could not find node for OID 999

Hipska · 2021-10-12T15:06:40Z

Correct, but we have the OID, so telegraf can continue and do its work.

MyaLongmire · 2021-10-12T15:21:49Z

I changed to error to be a warning so telegraf can continue doing its thing. I also added .999 back to the tests. Sorry for the confusion, I was miss understanding the problem :)

plugins/inputs/snmp/snmp_test.go

plugins/inputs/snmp/snmp.go

plugins/inputs/snmp/snmp_test.go

plugins/inputs/snmp/snmp.go

MyaLongmire · 2021-10-13T16:50:32Z

That is super weird. I have no idea what happened. Dave and I will try and fix it. Sorry for the confusion :)

plugins/inputs/snmp/snmp.go

plugins/inputs/snmp/snmp_test.go

telegraf-tiger · 2021-11-04T16:15:35Z

🥳 This pull request decreases the Telegraf binary size by -2.47 % for linux amd64 (new size: 127.5 MB, nightly size 130.7 MB)

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DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	i386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

Hipska · 2021-11-08T09:07:59Z

Why can't it be added without changing functionality?

…th variable, clean up init, update readme

MyaLongmire · 2021-11-29T22:11:09Z

@Hipska
@reimda and I paired on this and came up with a solution based on multiple factors:

we have no control over gosmi being global and we are not switching libraries now
snmp_trap has a path setting and that needs to continue to be supported
path in clientconfig should match snmp_trap setting "path" so we have the option in the future to make snmp_trap use clientconfig (outside the scope of this pr)
not wanting a global path setting in the agent

Our solution was to have one global gosmi instance and each plugin will append to its path. While refacorting the paths all gosmi code was moved into internal/snmp/mib.go

Hopefully, this solution puts your worries to rest about the global config paths :)

Hipska

I would rename the filename of internal/snmp/mib.go into translate.go or smi.go which better fits the contained code.

plugins/inputs/snmp/README.md

plugins/inputs/snmp/snmp.go

internal/snmp/mib.go

plugins/inputs/snmp/snmp_test.go

Hipska

Perfect, seems ready to me. Don't forget to also revert the other section.

plugins/inputs/snmp/README.md

srebhan

Hey @MyaLongmire, I think LoadMibsFromPath requires proper locking and protection of gosmi.Init() to be executed only once.

srebhan · 2021-11-30T17:17:52Z

internal/snmp/translate.go

+// must init, append path for each directory, load module for every file
+// or gosmi will fail without saying why
+func LoadMibsFromPath(paths []string, log telegraf.Logger) error {
+	gosmi.Init()


AFAICS, this function is called from each inputs.snmp plugin. Is this correct? If so, this means that you call gosmi.Init() multiple time with gosmi having a global state if my interpretation is correct...

If this is the case, chances are high that you get side-effects between the different plugin-instances potentially ranging from race-conditions when adding the modules to mutual overwriting of the loaded plugins when Init() is called multiple times... To reduce those effects you should init gosmi only once (using sync.Once) and guard this loading function with a lock. I don't know SNMP, but let's hope that there are no collisions possible between multiple (contradicting) mib-definitions...

we do call gosmi.Init more than once but the library has a built-in check to see if it has already been initialized or not.

I have also added a mutex

Hey @MyaLongmire, I don't see any check... When calling gosmi.Init() it calls this function which in turn calls smi.Init() that can be found here. Already at this point, multiple files are reread etc. Additionally internal.Init() is called also modifying data. While I agree that currently nothing "critical" is changed there it won't hurt to be on the safe side by

Suggested change

gosmi.Init()

once.Do(gosmi.Init)

and place var once sync.Once in the package scope, to be sure we call that function only once at least in that package. It would be even better to make sure it's not called elsewhere, but that's probably out of scope for this PR...

This is added in pr 10199

gosmi.Init() always calls smi.Init("gosmi") which always calls internal.Init(handleName) with the same handleName. That function does check whether it already has an internal handle of that name. That's why it looked to me like calling gosmi.Init() multiple times is safe.

It's a good idea to be defensive in our code and add sync.Once() anyway. I'm not sure gosmi intends it to be safe to call gosmi.Init() multiple times. I didn't see a guarantee in the docs, so even if it is now it might not be in a future version of gosmi.

internal/snmp/translate.go

telegraf-tiger · 2021-11-30T22:33:17Z

☺️ This pull request doesn't significantly change the Telegraf binary size (less than 1%)

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DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	i386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

This reverts commit 7675ce6.

* origin/master: (133 commits) chore: restart service if it is already running and upgraded via RPM (influxdata#9970) feat: update etc/telegraf.conf and etc/telegraf_windows.conf (influxdata#10237) fix: Handle duplicate registration of protocol-buffer files gracefully. (influxdata#10188) fix(http_listener_v2): fix panic on close (influxdata#10132) feat: add Vault input plugin (influxdata#10198) feat: support aws managed service for prometheus (influxdata#10202) fix: Make telegraf compile on Windows with golang 1.16.2 (influxdata#10246) Update changelog feat: Modbus add per-request tags (influxdata#10231) fix: Implement NaN and inf handling for elasticsearch output (influxdata#10196) feat: add nomad input plugin (influxdata#10106) fix: Print loaded plugins and deprecations for once and test (influxdata#10205) fix: eliminate MIB dependency for ifname processor (influxdata#10214) feat: Optimize locking for SNMP MIBs loading. (influxdata#10206) feat: Add SMART plugin concurrency configuration option, nvme-cli v1.14+ support and lint fixes. (influxdata#10150) feat: update configs (influxdata#10236) fix(inputs/kube_inventory): set TLS server name config properly (influxdata#9975) fix: Sudden close of Telegraf caused by OPC UA input plugin (influxdata#10230) fix: bump github.com/eclipse/paho.mqtt.golang from 1.3.0 to 1.3.5 (influxdata#9913) fix: json_v2 parser timestamp setting (influxdata#10221) fix: ensure graylog spec fields not prefixed with '_' (influxdata#10209) docs: remove duplicate links in CONTRIBUTING.md (influxdata#10218) fix: pool detection and metrics gathering for ZFS >= 2.1.x (influxdata#10099) fix: parallelism fix for ifname processor (influxdata#10007) chore: Forbids "log" package only for aggregators, inputs, outputs, parsers and processors (influxdata#10191) docs: address documentation gap when running telegraf in k8s (influxdata#10215) feat: update etc/telegraf.conf and etc/telegraf_windows.conf (influxdata#10211) fix: mqtt topic extracting no longer requires all three fields (influxdata#10208) fix: windows service - graceful shutdown of telegraf (influxdata#9616) feat: update etc/telegraf.conf and etc/telegraf_windows.conf (influxdata#10201) feat: Modbus support multiple slaves (gateway feature) (influxdata#9279) fix: Revert unintented corruption of the Makefile from influxdata#10200. (influxdata#10203) chore: remove triggering update-config bot in CI (influxdata#10195) Update changelog feat: Implement deprecation infrastructure (influxdata#10200) fix: extra lock on init for safety (influxdata#10199) fix: resolve influxdata#10027 (influxdata#10112) fix: register bigquery to output plugins influxdata#10177 (influxdata#10178) fix: sysstat use unique temp file vs hard-coded (influxdata#10165) refactor: snmp to use gosmi (influxdata#9518) ...

telegraf-tiger bot added the feat Improvement on an existing feature such as adding a new setting/mode to an existing plugin label Jul 19, 2021

MyaLongmire changed the title ~~Refactor snmp to use gosmi~~ refactor: snmp to use gosmi Sep 15, 2021

Hipska self-requested a review September 17, 2021 07:17

Hipska linked an issue Sep 17, 2021 that may be closed by this pull request

Improve speed of snmp plugin loading #5720

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MyaLongmire mentioned this pull request Sep 21, 2021

SNMP plugin GET for multiple values at once #3784

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Hipska reviewed Sep 22, 2021

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MyaLongmire force-pushed the snmp-gosmi-rework branch from 390765c to c91ce58 Compare October 11, 2021 17:14

MyaLongmire marked this pull request as ready for review October 11, 2021 19:50

MyaLongmire requested a review from Hipska October 11, 2021 19:51

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reimda force-pushed the snmp-gosmi-rework branch from 34d34a7 to 0ea43b3 Compare October 13, 2021 17:57

Hipska mentioned this pull request Oct 14, 2021

Cleanup snmp plugins #9055

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Hipska added the area/snmp label Oct 25, 2021

MyaLongmire added 4 commits November 29, 2021 10:35

chore: readme markdown

054aafd

Merge branch 'master' into snmp-gosmi-rework

a77e8a3

chore: marjdown linter fixes

cddb46d

move getmibspath to internal and append separate paths onto global pa…

5d241b5

…th variable, clean up init, update readme

MyaLongmire added 5 commits November 29, 2021 15:21

refactor: move all gosmi code from snmp_trap into internal

eec127c

refactor: move gosmi into snmp internal and out of snmp

c7257bb

chore: added keys to composite literals

7701f3f

chore: mute linter on too many return variables

d3d973e

fix: initialise nil map

45a424f

Hipska suggested changes Nov 30, 2021

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chore: renaming and docs

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MyaLongmire added 3 commits November 30, 2021 08:36

refactor: clean up test

194416e

chore: more doc clarity

2167aac

chore: remove leftover comments

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Hipska approved these changes Nov 30, 2021

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Hipska requested review from powersj and srebhan November 30, 2021 15:54

srebhan requested changes Nov 30, 2021

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MyaLongmire added 2 commits November 30, 2021 15:05

Merge branch 'master' into snmp-gosmi-rework

4beceeb

fix: added locking

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reimda merged commit 7675ce6 into master Nov 30, 2021

reimda deleted the snmp-gosmi-rework branch November 30, 2021 22:47

nward added a commit to nward/telegraf that referenced this pull request Jan 12, 2022

Revert "refactor: snmp to use gosmi (influxdata#9518)"

f8a7529

This reverts commit 7675ce6.

nward mentioned this pull request Jan 14, 2022

bulk walk timeout results in no data #6450

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reimda mentioned this pull request Mar 10, 2022

fix: Add option to select translator #10802

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