diff options
Diffstat (limited to 'app/scripts/controllers/network/createJsonRpcClient.js')
-rw-r--r-- | app/scripts/controllers/network/createJsonRpcClient.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/app/scripts/controllers/network/createJsonRpcClient.js b/app/scripts/controllers/network/createJsonRpcClient.js new file mode 100644 index 000000000..d712ed135 --- /dev/null +++ b/app/scripts/controllers/network/createJsonRpcClient.js @@ -0,0 +1,37 @@ +const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware') +const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware') +const createFetchMiddleware = require('eth-json-rpc-middleware/fetch') +const createBlockRefMiddleware = require('eth-json-rpc-middleware/block-ref') +const createBlockCacheMiddleware = require('eth-json-rpc-middleware/block-cache') +const createInflightMiddleware = require('eth-json-rpc-middleware/inflight-cache') +const providerFromMiddleware = require('eth-json-rpc-middleware/providerFromMiddleware') +const BlockTracker = require('eth-block-tracker') + +module.exports = createJsonRpcClient + +function createJsonRpcClient ({ rpcUrl }) { + const fetchMiddleware = createFetchMiddleware({ rpcUrl }) + const blockProvider = providerFromMiddleware(fetchMiddleware) + const blockTracker = new BlockTracker({ provider: blockProvider }) + + const networkMiddleware = mergeMiddleware([ + createBlockRefMiddleware({ blockTracker }), + createBlockCacheMiddleware({ blockTracker }), + createInflightMiddleware(), + createBlockTrackerInspectorMiddleware({ blockTracker }), + fetchMiddleware, + ]) + return { networkMiddleware, blockTracker } +} + +// inspect if response contains a block ref higher than our latest block +const futureBlockRefRequests = ['eth_getTransactionByHash', 'eth_getTransactionReceipt'] +function createBlockTrackerInspectorMiddleware ({ blockTracker }) { + return createAsyncMiddleware(async (req, res, next) => { + if (!futureBlockRefRequests.includes(req.method)) return next() + await next() + const blockNumber = Number.parseInt(res.result.blockNumber, 16) + const currentBlockNumber = Number.parseInt(blockTracker.getCurrentBlock(), 16) + if (blockNumber > currentBlockNumber) await blockTracker.checkForLatestBlock() + }) +} |