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AWS plugin: Add support for a compressed payload

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AWS imposes a limit of 16MB in my testing for the payload of a lambda. Compressing it enables us to pass x2-3 more data, thanks to the inefficiencies of JSON
This commit is contained in:
Jermolene 2018-10-30 09:29:12 +00:00
parent a75434a347
commit d6a0b06f02
2 changed files with 35 additions and 10 deletions
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11
plugins/tiddlywiki/aws/docs/lambda.tid
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@ -39,6 +39,17 @@ The Lambda boot code looks for an array of tiddlers to load in `event.tiddlers`,
```
The event data can optionally be compressed by passing a JSON object with a single property `compressed` that contains a base64 encoded GZIP compressed representation of the JSON payload data. For example:
```
var strPayload = JSON.stringify(payload);
require("zlib").gzip(strPayload,function(err,buff) {
var compressedPayload = {compressed: new Buffer(buff).toString("base64")};
// Invoke lambda with compressed payload
...
});
```
! Return data
If the Lambda function successfully executes it returns an object with the following fields:

14
plugins/tiddlywiki/aws/templates/lambda/handler.tid
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@ -16,6 +16,19 @@ exports.handler = function(event,context,callback) {
$tw.packageInfo = lambdaPackageInfo;
// Load any tiddlers from the package
$tw.preloadTiddlerArray(lambdaTiddlers);
// Decompress the event data if required
if(typeof event.compressed === "string") {
require("zlib").gunzip(Buffer.from(event.compressed,"base64"),function(err,buff) {
if(err) {
return callback(err);
}
boot(JSON.parse(buff.toString()));
});
} else {
boot(event);
}
function boot(event) {
// Load any tiddlers from the event
if(event.tiddlers) {
$tw.preloadTiddlerArray(event.tiddlers);
@ -28,3 +41,4 @@ exports.handler = function(event,context,callback) {
callback(null,$tw["lambda-result"]);
});
}
}