Add logDecoder, remove outdated tests

1 files changed, 29 insertions, 0 deletions

diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
new file mode 100644
index 000000000..98dd8eab6
--- /dev/null
+++ b/packages/contracts/src/utils/log_decoder.ts
@@ -0,0 +1,29 @@
+import { LogWithDecodedArgs, RawLog } from '@0xproject/types';
+import { AbiDecoder } from '@0xproject/utils';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+import { artifacts } from './artifacts';
+import { Artifact } from './types';
+
+export class LogDecoder {
+    private _abiDecoder: AbiDecoder;
+    constructor(networkId: number) {
+        if (_.isUndefined(networkId)) {
+            throw new Error('networkId not specified');
+        }
+        const abiArrays: Web3.AbiDefinition[][] = [];
+        _.forEach(artifacts, (artifact: Artifact) => {
+            const network = artifact.networks[networkId];
+            if (_.isUndefined(network)) {
+                throw new Error(`Artifact does not exist on network ${networkId}`);
+            }
+            abiArrays.push(network.abi);
+        });
+        this._abiDecoder = new AbiDecoder(abiArrays);
+    }
+    public tryToDecodeLogOrNoop<ArgsType>(log: Web3.LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
+        const logWithDecodedArgs = this._abiDecoder.tryToDecodeLogOrNoop(log);
+        return logWithDecodedArgs;
+    }
+}