Remove unused TokenProvider code (#2844)

The TokenProvider abstraction was refactored away during #1205 and is now obsolete. Other users of token pooling should use TokenPool and TokenPersistence directly.

core/token-pooling/token-provider.js

@@ -1,66 +0,0 @@
-'use strict'
-
-const { Token, TokenPool } = require('./token-pool')
-
-class StaticTokenProvider {
-  constructor({ tokenValidator, tokenString }) {
-    if (typeof tokenValidator !== 'function') {
-      throw Error('tokenValidator is not a function')
-    }
-    if (!tokenValidator(tokenString)) {
-      throw Error(`Not a valid token: ${tokenString}`)
-    }
-
-    this.staticToken = new Token(tokenString, null)
-  }
-
-  addToken() {
-    throw Error(
-      'When using token persistence, do not provide a static gh_token'
-    )
-  }
-
-  nextToken() {
-    return this.staticToken
-  }
-}
-
-class PoolingTokenProvider {
-  /*
-  tokenValidator: A function which returns true if the argument is a valid token.
-  */
-  constructor({ tokenValidator, batchSize = 25 }) {
-    if (typeof tokenValidator !== 'function') {
-      throw Error('tokenValidator is not a function')
-    }
-
-    this.tokenValidator = tokenValidator
-    this.tokenPool = new TokenPool({ batchSize })
-  }
-
-  addToken(tokenString) {
-    if (!this.tokenValidator(tokenString)) {
-      throw Error(`Not a valid token: ${tokenString}`)
-    }
-
-    this.tokenPool.add(tokenString)
-  }
-
-  nextToken() {
-    return this.tokenPool.next()
-  }
-
-  // Return an array of token strings.
-  toNative() {
-    return this.tokenPool.allValidTokenIds()
-  }
-
-  serializeDebugInfo(options) {
-    return this.tokenPool.serializeDebugInfo(options)
-  }
-}
-
-module.exports = {
-  StaticTokenProvider,
-  PoolingTokenProvider,
-}

core/token-pooling/token-provider.spec.js

@@ -1,21 +0,0 @@
-'use strict'
-
-const assert = require('assert')
-const { PoolingTokenProvider } = require('./token-provider')
-const isValidGithubToken = require('../../services/github/auth/is-valid-token')
-
-describe('The token provider', function() {
-  describe('toNative', function() {
-    it('should return the expected value', function() {
-      const tokens = ['1', '2', '3', '4', '5'].map(c => c.repeat(40))
-      const provider = new PoolingTokenProvider({
-        tokenValidator: isValidGithubToken,
-      })
-      tokens.forEach(t => provider.addToken(t))
-      assert.deepStrictEqual(
-        provider.toNative().sort(),
-        Array.from(tokens).sort()
-      )
-    })
-  })
-})