feat(ur): more evenly distribute routing across hosts

permaweb · May 23, 2024 · eb7e27f · eb7e27f
1 parent e598803
commit eb7e27f
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Showing 2 changed files with 281 additions and 17 deletions.
diff --git a/servers/ur/src/domain.js b/servers/ur/src/domain.js
@@ -67,18 +67,47 @@ export function determineHostWith ({ hosts = [], bailout }) {
     }
 
     /**
-       * Check cache, and hydrate if necessary
-       */
+     * Check cache, and hydrate if necessary
+     */
     let hashSum = cache.get(processId)
     if (!hashSum) {
-      hashSum = computeHashSumFromProcessId(processId)
+      /**
+       * Only perform the expensive computation of hash -> idx once and cache
+       */
+      hashSum = computeHashSumFromProcessId({ processId, length: hosts.length })
       cache.set(processId, hashSum)
     }
 
     return hosts[(hashSum + failoverAttempt) % hosts.length]
   }
 }
 
-function computeHashSumFromProcessId (processId) {
-  return processId.split('').reduce((acc, char) => acc + char.charCodeAt(0), 0)
+function base64UrlToBase64 (base64Url) {
+  // Replace URL-safe characters with standard Base64 characters
+  let base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/')
+  // Add padding characters if necessary
+  while (base64.length % 4) base64 += '='
+  return base64
+}
+
+function base64ToUint8Array (base64) {
+  // Decode the Base64 string to a binary string
+  const binaryString = atob(base64)
+
+  // Create a Uint8Array to hold the binary data
+  const len = binaryString.length
+  const bytes = new Uint8Array(binaryString.length)
+  for (let i = 0; i < len; i++) bytes[i] = binaryString.charCodeAt(i)
+
+  return bytes
+}
+
+export function computeHashSumFromProcessId ({ processId, length }) {
+  // Convert the Base64 URL-encoded hash to a Uint8Array
+  const uint8Array = base64ToUint8Array(base64UrlToBase64(processId))
+
+  let hashSum = BigInt(0)
+  for (let i = 0; i < uint8Array.length; i++) hashSum = (hashSum << BigInt(8)) + BigInt(uint8Array[i])
+
+  return Number(hashSum % BigInt(length))
 }
diff --git a/servers/ur/src/domain.test.js b/servers/ur/src/domain.test.js
@@ -1,7 +1,9 @@
 import { describe, test } from 'node:test'
 import assert from 'node:assert'
 
-import { determineHostWith, bailoutWith } from './domain.js'
+import { groupBy, identity } from 'ramda'
+
+import { determineHostWith, bailoutWith, computeHashSumFromProcessId } from './domain.js'
 
 const HOSTS = ['http://foo.bar', 'http://fizz.buzz']
 const cache = {
@@ -14,19 +16,19 @@ describe('domain', () => {
     test('should deterministically return a valid host', async () => {
       const determineHost = determineHostWith({ hosts: HOSTS, cache })
 
-      assert(await determineHost({ processId: 'process-123', failoverAttempt: 0 }))
-      assert.equal(await determineHost({ processId: 'process-123', failoverAttempt: 0 }), await determineHost({ processId: 'process-123', failoverAttempt: 0 }))
+      assert(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }))
+      assert.equal(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }), await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }))
     })
 
     test('should shift the determined host according to failoverAttempt', async () => {
       const determineHost = determineHostWith({ hosts: HOSTS, cache })
 
-      assert.notEqual(await determineHost({ processId: 'process-123', failoverAttempt: 0 }), await determineHost({ processId: 'process-123', failoverAttempt: 1 }))
+      assert.notEqual(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }), await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 1 }))
     })
 
     test('should return undefined if all hosts have been attempted', async () => {
       const determineHost = determineHostWith({ hosts: HOSTS, cache })
-      assert.equal(await determineHost({ processId: 'process-123', failoverAttempt: HOSTS.length }), undefined)
+      assert.equal(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: HOSTS.length }), undefined)
     })
 
     test('should serve from the cache, if found', async () => {
@@ -35,12 +37,12 @@ describe('domain', () => {
         cache: { ...cache, get: () => 10 }
       })
 
-      assert.equal(await determineHost({ processId: 'process-123', failoverAttempt: HOSTS.length }), HOSTS[HOSTS.length & 10])
+      assert.equal(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: HOSTS.length }), HOSTS[HOSTS.length & 10])
     })
 
     test('should redirect to the subrouterUrl', async () => {
       const fetchMock = async (url) => {
-        assert.equal(url, 'surUrl1/processes/process-123')
+        assert.equal(url, 'surUrl1/processes/0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0')
         return new Response(JSON.stringify({ owner: { address: 'owner2' } }))
       }
 
@@ -53,13 +55,13 @@ describe('domain', () => {
 
       const determineHost = determineHostWith({ hosts: HOSTS, cache, bailout })
 
-      assert(await determineHost({ processId: 'process-123', failoverAttempt: 0 }))
-      assert.equal(await determineHost({ processId: 'process-123', failoverAttempt: 0 }), 'subrouterUrl1')
+      assert(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }))
+      assert.equal(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }), 'subrouterUrl1')
     })
 
     test('should not redirect to the subrouterUrl', async () => {
       const fetchMock = async (url) => {
-        assert.equal(url, 'surUrl1/processes/process-123')
+        assert.equal(url, 'surUrl1/processes/0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0')
         /**
          * Here the owner does not match any in the list
          * this will cause it to not redirect to the subrouter
@@ -76,8 +78,241 @@ describe('domain', () => {
 
       const determineHost = determineHostWith({ hosts: HOSTS, cache, bailout })
 
-      assert(await determineHost({ processId: 'process-123', failoverAttempt: 0 }))
-      assert.equal(await determineHost({ processId: 'process-123', failoverAttempt: 0 }), 'http://foo.bar')
+      assert(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }))
+      assert.equal(await determineHost({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', failoverAttempt: 0 }), 'http://fizz.buzz')
+    })
+  })
+
+  describe('computeHashSumFromProcessId', () => {
+    test('should deterministically return a number', () => {
+      const LENGTH = 100
+      const sum = computeHashSumFromProcessId({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', length: LENGTH })
+      Array(10).fill(0).map(() => {
+        const res = computeHashSumFromProcessId({ processId: '0h1DJuO1SBNOR54ZN-rwt0Ztenpv7us1XKDxhLMzYq0', length: LENGTH })
+        assert.equal(typeof res, 'number')
+        assert.equal(res, sum)
+        assert.ok(res <= LENGTH)
+        return res
+      })
+    })
+
+    test('should roughly evenly distribute hashes across the length', () => {
+      const hashes = [
+        'SQYxaO7iM_i1eL-3skVf2wLBi0Fhrzv5oy705bEohEs',
+        'imUfWfjYqNl5YQfXrZyXMXAoqCK2tHDKtRNfVYfrbJE',
+        'oY99yZv42715q5PtNO6XIGrv0n62hqVRPkrKmJAnvHA',
+        'E-cwIwZ8OiHINrdRRbcUi340yjfb5l4C_68nNCZj8rU',
+        'bJvtIw9Rpve_kIppucUHXgvPB1w-qjIdyej3t3GVXeQ',
+        'A3SL7UNithtbszpgzr95SpW4xp3EPVIAW2VUdvfEX5A',
+        'NNwi4HfyetuJOd40D2Qsfs0uRLxcTq7JF4VsMrQSgDM',
+        '8D2wma3e47meg8Vy0iv1GhwhNem1ofCCrWSi3W1WrrA',
+        'P_xy4wfujDL9xPhzRK7-owC1dv-SsjXuepaFDW9xsds',
+        'W9V248sB-8W7gjd74UJ48WIgWoq9ViZ-E0sRmGuu85w',
+        'QipuAHOxddYxNwmM9HQgP20-3Q4uzwxJutSBomMumuo',
+        'AXBJDYT00eTiug_bNmoCDsWxLsX3aX6Ug08Rde-nZCE',
+        'B6RQz14DvkH-T0R_Gv2y58DFpCh3n4YDUVHxWZsbfJI',
+        'PFUNOHVMfw2l-lP6SgP9xrB8t2uXMWiUGpmndS_NaZg',
+        'x0818j0JPITxycJDiVgTuBbCdO-uC0jOVqg_FB6CqPQ',
+        'lb0j2XhwHBqQvtVAg2hI04qvt4DIC9N3Kx_PKMXwe60',
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+        'D3EoAVQZ7gIg0W85M35b0wKyhCCIADXNpHJ5tmU098A',
+        'mzj-zVAYEUKuae21QgMlxHnUTzAwEx85Xp8Jv6kWqoU',
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+        'b3NpsEZr9JWa2jAp--KbVt3FPDDpFm2K4KSSLJ4GtIk',
+        '0H9WocNfJJVJfOoc9SAtVIsHGGiWdP-YNMfHX7eBvgU',
+        'CkvfdJES_7DJ1HBe92qENjypZDRUPWUsljCGkLbmUvo',
+        'RNStAnmu79xuj9lbvdURyiihTGyGcrDDjp2Sw8b988k',
+        '8teJTYfoQZYMeAO0c14nEE878as22eXlEVB7Az5lKlc',
+        '3-9DSEGRKTpeb0A7nGYhpzdVb8AewVhTDU7XRsyJEIU',
+        'T4BJ469gPV6hivL_N6aE_50TaIG_TgGZ5RdS9xe-usU',
+        'xyQmviYOqluF_Nt7BHRhBHGC7B37pbdsOwM9gGWYIhc',
+        'cBKZd7hKhM1z3pAocpCloeabom3YkicKj7FdGkWtglc',
+        'wIGt23xSqTFOFlPryZ4xwbOIgNUjPJ_rFSzA9iSTkKw',
+        'mBhoWW_1FDVM3gN6iBnrIRTcAWHUrjSmlx1wwDNy1-4',
+        'Yfk6KkqxOKFytfa6hzLROOEhhiIv85tUE20Ut1FcLMM',
+        '7EVoEq9cOFfxZrdIoPMrcT4my9e3j49PDixTlBKEGJI',
+        'kYxxTu-FV3GbNMG4Zod7MKUWMWuh5VZ8-WPk8djMh14',
+        'unkplbFXUyDo80F3bPScFPjxGW9wZ3an7CpjuVp2TaQ',
+        '6ZRKUl4OxMS01oFglN7nJbQLg6ULNGGJKPHx8aw39Es',
+        'uaNC63pcWQ2m5qDxBgVHOXR4ZNUl8hgvZjh78wf6zQU',
+        'akRDxm1jKKIybRk97H0fL_KL7xD0siaTFsu_bAKNUEI',
+        'YaQvCn8sjS87xp_dzriBcwK8LP29vT3tFxW_M0Cv82E',
+        'UpAl1Nl54N18iMfn0lynlvTI_Es7J_983SXoW_fwRTI',
+        'GEitJpJD60Ll9TIIBNbtfX3QVk1qN3Jre8rZQvNKu6o',
+        'vDCJd458zh3_Fotd69jrcZhmIwmQ6qUaHqX0RbPwuFI',
+        'Ojs2cn7i_Ed6ptcloxDYAqHNLnUsBP-vy5An5a8L0AM',
+        'hNedUXe_sVOWg3751NPXpYSKwdU4ck43JLkU15SkmS0',
+        'RhjQqV0njiw-zkhCgYDnDr7Zvkg2b5gtOqnasAMm-uA',
+        '6KircazJlktWhLAIDJnwsKmMeVE-kNgzJc3l4mGahHk',
+        'gn7ihvR73CKYP_qCalrWIZSc7F6q2rfV8fDHkolUQzA',
+        'bgyIvzWZ4G7ailclkep9pfceXieBIgz5FRMmPW3DeCk',
+        'BcbMGUxPlsa6jofNG2yZaroagtsbfJWqwG0d-BjnS9E',
+        'I0BoXGTKPdv9A6_huEUB-4AB2o974K2h-MSkIdY8iQY',
+        'jtrWowojBWLF8rObSPDRZhIk6F4qbPqLxn-Sz2RMYMM',
+        'z91jod8HYuN1BlSF8ISF4KpiPmmvjB--Ba0el6iWBIM',
+        'F33TVdp5Saybpdbem-l-GAO0naCCVUKQYH0aEw7YYEc',
+        'mYbm9rCbE6f6fkBmTAf1ZL7mxCneCroYipgbcxww6H8',
+        'o0XZPCiKE0xXD3aNH9ynv9oOjnaH9dJMnmYk_wWuUyk',
+        'yXQkJfg0_qPc4bdssQ9GRbo0TpEGG4C60_jcpMMh2vY',
+        'vit-qBn3LSXoxtvWXE0PLf7Fti8XPJGBQve4UIb-NhE',
+        'wEUROwSxdwhEy5GDkEZT3b7kc6f5QUCuN6XHAqXnRf0',
+        'c7Sm1mhAhnbEA5Gac8JWjm5nBdo95QSqo-i1qeWgLnM',
+        'UIi20hpQoou5BBD9YnaGfWROt3SO2TsaPl8Rohnb550',
+        '7tJ7-9xoxWw0sV9MGTyJI8qfGgHzttrTfZdifm035ag',
+        'd9nOlNHWA5gCQEWJOHe6iuYLD-o2nZ6WIVLImse9UYY',
+        '4INMchajecxVD7vfj7t76ad-ZZHf9O1-Va0TgxOWOYM',
+        'ffNPjJZ_3UcbPzLVWiTeqncoPU3p1pAVE_9zfSPN9uY',
+        'Q4aTlIxLpXYyWqAx7LFO0Pe_yh3DqMjqBW2LyFawg0o',
+        '5lqk5HLiJQyqNVe75MbO-hOAjLvWmwAlYjSgO-cO6IE',
+        'qqut2dcrpLsv-4kYphnIcu9dC3stKYXKpDjIhjccr7Q',
+        'UgqjEApcb7eV5UAziQiMqA6etuQCZ0sJofMvmE72098',
+        'g6sBs8wyZ4vXXCy5ZJUr8MQsdKlsnqXZTHKgQhhiMVM',
+        'RnWyC3sfNUlL-RKr4rr3V3olYCkgIes7d1oIeQQVpe8',
+        'L2eV_EW1YiZNbTIT5PkTpNzZTxl_0c5quMgk7DLbYPE',
+        'GhRoboDF5ntQX1p3aWAnUlTVyH5iHue9fnT7PBLy9UQ',
+        '9gpysJc-mBUVvxyCQWFD3sSeR_StiOQDjrK1ekCHsO8',
+        'ezC-4m99E7wmuURJJ75tFEubWhE8pQ1qgMEKFn8YZWs',
+        'txQBtHUVoNImb8MpttcDPXqg1fOSFqEm05JXJ51lZn0',
+        'Q4sJo_D8Tb9Iv7_tqzfXxM9fS6EQyAUftQLv6ZDY9XA',
+        'q2QpdpMUSc9M_y0-y2G9NtR6U2k_JZYh8h1Tamw5WNQ',
+        'ILX48su-yE2qdQY5GCjOrU6wy8TAGMvTAfJQZNFPanI',
+        '1D7fXt_bcgr5QhF1icTPf3EiuaS_JGfH63cT5GJEris'
+      ]
+
+      const res = Object.values(
+        groupBy(
+          identity,
+          hashes.map(h => computeHashSumFromProcessId({ processId: h, length: 24 }))
+        )
+      ).map(a => a.length)
+
+      // TODO: anyway that we can assert that these values are "roughly even"?
+      console.log(res)
     })
   })
 })