feat: evidence module subgraph

Author: jaybuidl

subgraph/src/EvidenceModule.ts

@@ -0,0 +1,20 @@
+import { Evidence as EvidenceEvent } from "../generated/EvidenceModule/EvidenceModule";
+import { ClassicEvidence } from "../generated/schema";
+import { ensureClassicEvidenceGroup } from "./entities/ClassicEvidenceGroup";
+import { ensureUser } from "./entities/User";
+import { ONE } from "./utils";
+
+export function handleEvidenceEvent(event: EvidenceEvent): void {
+  const evidenceGroupID = event.params._externalDisputeID.toString();
+  const evidenceGroup = ensureClassicEvidenceGroup(evidenceGroupID);
+  const evidenceIndex = evidenceGroup.nextEvidenceIndex;
+  evidenceGroup.nextEvidenceIndex = evidenceGroup.nextEvidenceIndex.plus(ONE);
+  evidenceGroup.save();
+  const evidence = new ClassicEvidence(`${evidenceGroupID}-${evidenceIndex.toString()}`);
+  const userId = event.params._party.toHexString();
+  evidence.evidence = event.params._evidence;
+  evidence.evidenceGroup = evidenceGroupID.toString();
+  evidence.sender = userId;
+  ensureUser(userId);
+  evidence.save();
+}