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Update dns-in-google-sheets.mdx to add caching in NSLookup #17298

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merged 8 commits into from
Oct 24, 2024
Merged

Update dns-in-google-sheets.mdx to add caching in NSLookup #17298

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dc32f5c
Update dns-in-google-sheets.mdx to include cache support in the NSLoo…
beltofte Oct 3, 2024
9711bc0
Process suggested changes for Answer TTL and usecache disabled by def…
RebeccaTamachiro Oct 21, 2024
6e8fdcd
Change how minCacheTTL is set
beltofte Oct 21, 2024
06459ce
Minor code style - change tab to spaces.
beltofte Oct 21, 2024
4eb8671
Apply patch + rename usecache to useCache
beltofte Oct 23, 2024
7f6d534
Remove outdated cache value from descriptive paragraph
RebeccaTamachiro Oct 24, 2024
23ab73b
Merge branch 'production' into patch-1
RebeccaTamachiro Oct 24, 2024
8874011
Replace one remaining var by const
RebeccaTamachiro Oct 24, 2024
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35 changes: 33 additions & 2 deletions src/content/docs/1.1.1.1/other-ways-to-use-1.1.1.1/dns-in-google-sheets.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ import { Details } from "~/components"
1.1.1.1 works directly inside Google Sheets. To get started, create a [Google Function](https://developers.google.com/apps-script/guides/sheets/functions) with the following code:

```js
function NSLookup(type, domain) {
function NSLookup(type, domain, usecache = false, cachettl = 1800) {

if (typeof type == 'undefined') {
throw new Error('Missing parameter 1 dns type');
Expand All @@ -22,10 +22,31 @@ function NSLookup(type, domain) {
throw new Error('Missing parameter 2 domain name');
}

if (typeof usecache != "boolean") {
throw new Error('Only boolean values allowed in 3 use cache');
}

if (typeof cachettl != "number") {
throw new Error('Only numeric values allowed in 4 cache ttl');
}

type = type.toUpperCase();
domain = domain.toLowerCase();

if (usecache) {
// Cache key and hash
cacheKey = domain + "@" + type;
cacheHash = Utilities.base64Encode(cacheKey);
cacheBinKey = "nslookup-result-" + cacheHash;

var cache = CacheService.getScriptCache();
var cachedResult = cache.get(cacheBinKey);
if (cachedResult != null) {
return cachedResult;
}
}

var url = 'https://cloudflare-dns.com/dns-query?name=' + encodeURIComponent(domain) + '&type=' + encodeURIComponent(type);

var options = {
muteHttpExceptions: true,
headers: {
Expand Down Expand Up @@ -68,6 +89,15 @@ function NSLookup(type, domain) {

var outputString = outputData.join(',');

if (usecache) {
cache.put(cacheBinKey, outputString, cachettl);
}
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for (var i in response.Answer) {
outputData.push(response.Answer[i].data);
minCacheTTL = Math.min(minCacheTTL, response.Answer[i].TTL);
}
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return outputString;
}
```
Expand All @@ -76,6 +106,7 @@ function NSLookup(type, domain) {

When you feed the function `NSLookup` a record type and a domain, you will get a DNS record value in the cell you called `NSLookup`.

To limit the number of DNS lookups and speed up the results (especially in larger Google Sheets), you can cache the returned DNS record value for 1800 seconds. Both the cache usage and the cache TTL can be controlled in arguments 3 and 4, respectively.

<Details header="Supported DNS record types">

Expand Down
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