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add option to not shuffle providers #588

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add option to not shuffle providers #588

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8 changes: 6 additions & 2 deletions packages/providers/src.ts/fallback-provider.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -85,9 +85,10 @@ let nextRid = 1;
export class FallbackProvider extends BaseProvider {
readonly providers: Array<BaseProvider>;
readonly weights: Array<number>;
readonly shuffle: boolean;
readonly quorum: number;

constructor(providers: Array<BaseProvider>, quorum?: number, weights?: Array<number>) {
constructor(providers: Array<BaseProvider>, quorum?: number, weights?: Array<number>, shuffle?: boolean) {
logger.checkNew(new.target, FallbackProvider);

if (providers.length === 0) {
Expand Down Expand Up @@ -116,6 +117,7 @@ export class FallbackProvider extends BaseProvider {
}
}

shuffle = shuffle === false ? false : true

// All networks are ready, we can know the network for certain
let ready = checkNetworks(providers.map((p) => p.network));
Expand All @@ -138,6 +140,7 @@ export class FallbackProvider extends BaseProvider {
defineReadOnly(this, "providers", Object.freeze(providers.slice()));
defineReadOnly(this, "quorum", quorum);
defineReadOnly(this, "weights", Object.freeze(weights.slice()));
defineReadOnly(this, "shuffle", shuffle);
}

static doPerform(provider: BaseProvider, method: string, params: { [ name: string ]: any }): Promise<any> {
Expand Down Expand Up @@ -173,7 +176,8 @@ export class FallbackProvider extends BaseProvider {

perform(method: string, params: { [name: string]: any }): any {
let T0 = now();
let runners: Array<Runner> = (<Array<BaseProvider>>(shuffled(this.providers))).map((provider, i) => {
let providers: Array<BaseProvider> = this.shuffle ? shuffled(this.providers) : this.providers
let runners: Array<Runner> = providers.map((provider, i) => {
let weight = this.weights[i];
let rid = nextRid++;
return {
Expand Down