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66 lines
2.2 KiB
66 lines
2.2 KiB
7 years ago
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const log = require('loglevel')
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/**
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* JSON-RPC error object
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*
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* @typedef {Object} RpcError
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* @property {number} code - Indicates the error type that occurred
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* @property {Object} [data] - Contains additional information about the error
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* @property {string} [message] - Short description of the error
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*/
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/**
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* Middleware configuration object
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*
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* @typedef {Object} MiddlewareConfig
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* @property {boolean} [override] - Use RPC_ERRORS message in place of provider message
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*/
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/**
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* Map of standard and non-standard RPC error codes to messages
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*/
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const RPC_ERRORS = {
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1: 'An unauthorized action was attempted.',
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2: 'A disallowed action was attempted.',
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3: 'An execution error occurred.',
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[-32600]: 'The JSON sent is not a valid Request object.',
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[-32601]: 'The method does not exist / is not available.',
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[-32602]: 'Invalid method parameter(s).',
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[-32603]: 'Internal JSON-RPC error.',
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[-32700]: 'Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.',
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internal: 'Internal server error.',
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unknown: 'Unknown JSON-RPC error.',
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}
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/**
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* Modifies a JSON-RPC error object in-place to add a human-readable message,
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* optionally overriding any provider-supplied message
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*
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* @param {RpcError} error - JSON-RPC error object
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* @param {boolean} override - Use RPC_ERRORS message in place of provider message
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*/
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function sanitizeRPCError (error, override) {
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if (error.message && !override) { return error }
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const message = error.code > -31099 && error.code < -32100 ? RPC_ERRORS.internal : RPC_ERRORS[error.code]
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error.message = message || RPC_ERRORS.unknown
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}
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/**
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* json-rpc-engine middleware that both logs standard and non-standard error
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* messages and ends middleware stack traversal if an error is encountered
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*
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* @param {MiddlewareConfig} [config={override:true}] - Middleware configuration
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* @returns {Function} json-rpc-engine middleware function
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*/
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function createErrorMiddleware ({ override = true } = {}) {
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return (req, res, next) => {
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next(done => {
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const { error } = res
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if (!error) { return done() }
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sanitizeRPCError(error)
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log.error(`MetaMask - RPC Error: ${error.message}`, error)
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})
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}
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}
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module.exports = createErrorMiddleware
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