Using two instances as middlewares causes a loop on response

[pcostesi]

I was trying to implement a two-level cache on one of our systems. Our goal is to have a long-lived global Redis cache shared between a couple of instances of our Express app, and a smaller short-lived in-memory cache to relieve the load on Redis.

When we access any endpoint after both middlewares, it spins in an endless loop, apparently concatenating the outputs. This happens regardless we are using Redis or in-memory caches.

The Node process then crashes with the following error:

~/s/test-apicache ❯❯❯ node . > log.txt
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x100080c68 node::Abort() [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 2: 0x100080dec node::errors::TryCatchScope::~TryCatchScope() [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 3: 0x100185167 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 4: 0x100185103 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/Users/pcostesi/.nvm/versions/node/v12.16
.1/bin/node]
 5: 0x10030b2f5 v8::internal::Heap::FatalProcessOutOfMemory(char const*) [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 6: 0x10030c9c4 v8::internal::Heap::RecomputeLimits(v8::internal::GarbageCollector) [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 7: 0x100309837 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [/Users/pcostesi/.nvm/version
s/node/v12.16.1/bin/node]
 8: 0x1003077fd v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [
/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
 9: 0x1003066b1 v8::internal::Heap::HandleGCRequest() [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
10: 0x1002cc0c0 v8::internal::StackGuard::HandleInterrupts() [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
11: 0x100617e9c v8::internal::Runtime_StackGuard(int, unsigned long*, v8::internal::Isolate*) [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/
node]
12: 0x100950919 Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_NoBuiltinExit [/Users/pcostesi/.nvm/versions/node/v12.16.1/bin/node]
13: 0xfbc54c4e5c0 
[1]    24238 abort      node . > log.txt

The log output is quite massive (nearly 2.2G). From what I could find, I think the following might help:

�[36m[apicache]�[0m adding cache entry for "/foo" @ 1 minute �[33m- 1.05sec�[0m
�[36m[apicache]�[0m _apicache.headers: 
�[36m[apicache]�[0m res.getHeaders():  [Object: null prototype] {
  'x-powered-by': 'Express',
  'content-type': 'application/json; charset=utf-8',
  'content-length': '13',
  etag: 'W/"d-pedE0BZFQNM7HX6mFsKPL6l+dUo"'
}
�[36m[apicache]�[0m adding cache entry for "/foo" @ 5 minutes �[33m- 1.06sec�[0m
�[36m[apicache]�[0m _apicache.headers: 
�[36m[apicache]�[0m res.getHeaders():  [Object: null prototype] {
  'x-powered-by': 'Express',
  'content-type': 'text/html; charset=utf-8',
  'content-length': 1079,
  etag: 'W/"d-pedE0BZFQNM7HX6mFsKPL6l+dUo"',
  'content-security-policy': "default-src 'none'",
  'x-content-type-options': 'nosniff'
}
�[36m[apicache]�[0m cacheObject:  {
  status: 500,
  headers: {
    'x-powered-by': 'Express',
    'content-type': 'text/html; charset=utf-8',
    'content-length': 1079,
    etag: 'W/"d-pedE0BZFQNM7HX6mFsKPL6l+dUo"',
    'content-security-policy': "default-src 'none'",
    'x-content-type-options': 'nosniff'
  },
  data: '{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":"bar"}{"foo":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html>\n' +
    '<html lang="en">\n' +
    '<head>\n' +
    '<meta charset="utf-8">\n' +
    '<title>Error</title>\n' +
    '</head>\n' +
    '<body>\n' +
    '<pre>RangeError: Maximum call stack size exceeded<br> &nbsp; &nbsp;at formatRaw (internal/util/inspect.js:940:12)<br> &nbsp; &nbsp;at formatValue (internal/util/inspect.js:721:10)<br> &nbsp; &nbsp;at inspect (internal/util/inspect.js:264:10)<br> &nbsp; &nbsp;at formatWithOptions (internal/util/inspect.js:1865:40)<br> &nbsp; &nbsp;at Object.Console.&lt;computed&gt; (internal/console/constructor.js:281:10)<br> &nbsp; &nbsp;at Object.log (internal/console/constructor.js:291:61)<br> &nbsp; &nbsp;at debug (/Users/pcostesi/src/test-apicache/node_modules/apicache/src/apicache.js:77:61)<br> &nbsp; &nbsp;at ServerResponse.res.end (/Users/pcostesi/src/test-apicache/node_modules/apicache/src/apicache.js:234:11)<br> &nbsp; &nbsp;at ServerResponse.res.end (/Users/pcostesi/src/test-apicache/node_modules/apicache/src/apicache.js:238:32)<br> &nbsp; &nbsp;at ServerResponse.res.end (/Users/pcostesi/src/test-apicache/node_modules/apicache/src/apicache.js:238:32)</pre>\n' +
    '</body>\n' +
    '</html>\n',
  encoding: 'utf8',
  timestamp: 1592109597.823
}

This is a minimal reproduction of the setup:

const apicache = require('apicache')
const express = require('express')

let app = express()
let opts1 = { debug: true }
let opts2 = { ...opts1 }
let cache1 = apicache.newInstance(opts1)
let cache2 = apicache.newInstance(opts2)

app.use(cache1.middleware('1 minute'))

app.get('/alive', (req, res) => {
    console.log("returning value")
    res.json({ foo: 'alive' })
})

app.use(cache2.middleware('5 minutes'))
app.get('/foo', (req, res) => {
    console.log("returning value")
    res.json({ foo: 'bar' })
})

app.listen(3000, () => {
    console.log("listening")
})

We tested these scenarios with the following:

• Returns as expected: curl localhost:3000/alive -v
• Gets stuck: curl localhost:3000/foo -v

I know this is an edge case that apicache might not cover, and for now we can handle a little more load on the Redis servers. We wanted to check if we are missing something here, or if we can work around this behaviour somehow.

[pcostesi]

I think this might be related to #200. However, we want both caches to work at the same time, so if the in-memory cache has a miss then the Redis cache has a chance to handle the response too.