@pythnetwork/price-service-sdk
Version:
Pyth price service SDK
243 lines (242 loc) • 6.79 kB
JavaScript
// To parse this data:
//
// import { Convert, PriceFeed } from "./file";
//
// const priceFeed = Convert.toPriceFeed(json);
//
// These functions will throw an error if the JSON doesn't
// match the expected interface, even if the JSON is valid.
/**
* Represents an aggregate price from Pyth publisher feeds.
*/ "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "Convert", {
enumerable: true,
get: function() {
return Convert;
}
});
class Convert {
static toPriceFeed(json) {
return cast(json, r("PriceFeed"));
}
static priceFeedToJson(value) {
return uncast(value, r("PriceFeed"));
}
static toPrice(json) {
return cast(json, r("Price"));
}
static priceToJson(value) {
return uncast(value, r("Price"));
}
static toPriceFeedMetadata(json) {
return cast(json, r("PriceFeedMetadata"));
}
static priceFeedMetadataToJson(value) {
return uncast(value, r("PriceFeedMetadata"));
}
}
function invalidValue(typ, val, key = "") {
if (key) {
throw new Error(`Invalid value for key "${key}". Expected type ${JSON.stringify(typ)} but got ${JSON.stringify(val)}`);
}
throw new Error(`Invalid value ${JSON.stringify(val)} for type ${JSON.stringify(typ)}`);
}
function jsonToJSProps(typ) {
if (typ.jsonToJS === undefined) {
const map = {};
typ.props.forEach((p)=>map[p.json] = {
key: p.js,
typ: p.typ
});
typ.jsonToJS = map;
}
return typ.jsonToJS;
}
function jsToJSONProps(typ) {
if (typ.jsToJSON === undefined) {
const map = {};
typ.props.forEach((p)=>map[p.js] = {
key: p.json,
typ: p.typ
});
typ.jsToJSON = map;
}
return typ.jsToJSON;
}
function transform(val, typ, getProps, key = "") {
function transformPrimitive(typ, val) {
if (typeof typ === typeof val) return val;
return invalidValue(typ, val, key);
}
function transformUnion(typs, val) {
// val must validate against one typ in typs
const l = typs.length;
for(let i = 0; i < l; i++){
const typ = typs[i];
try {
return transform(val, typ, getProps);
} catch {}
}
return invalidValue(typs, val);
}
function transformEnum(cases, val) {
if (cases.includes(val)) return val;
return invalidValue(cases, val);
}
function transformArray(typ, val) {
// val must be an array with no invalid elements
if (!Array.isArray(val)) return invalidValue("array", val);
return val.map((el)=>transform(el, typ, getProps));
}
function transformDate(val) {
if (val === null) {
return null;
}
const d = new Date(val);
if (isNaN(d.valueOf())) {
return invalidValue("Date", val);
}
return d;
}
function transformObject(props, additional, val) {
if (val === null || typeof val !== "object" || Array.isArray(val)) {
return invalidValue("object", val);
}
const result = {};
for (const key of Object.getOwnPropertyNames(props)){
const prop = props[key];
const v = Object.prototype.hasOwnProperty.call(val, key) ? val[key] : undefined;
result[prop.key] = transform(v, prop.typ, getProps, prop.key);
}
for (const key of Object.getOwnPropertyNames(val)){
if (!Object.prototype.hasOwnProperty.call(props, key)) {
result[key] = transform(val[key], additional, getProps, key);
}
}
return result;
}
if (typ === "any") return val;
if (typ === null) {
if (val === null) return val;
return invalidValue(typ, val);
}
if (typ === false) return invalidValue(typ, val);
while(typeof typ === "object" && typ.ref !== undefined){
typ = typeMap[typ.ref];
}
if (Array.isArray(typ)) return transformEnum(typ, val);
if (typeof typ === "object") {
return typ.hasOwnProperty("unionMembers") ? transformUnion(typ.unionMembers, val) : typ.hasOwnProperty("arrayItems") ? transformArray(typ.arrayItems, val) : typ.hasOwnProperty("props") ? transformObject(getProps(typ), typ.additional, val) : invalidValue(typ, val);
}
// Numbers can be parsed by Date but shouldn't be.
if (typ === Date && typeof val !== "number") return transformDate(val);
return transformPrimitive(typ, val);
}
function cast(val, typ) {
return transform(val, typ, jsonToJSProps);
}
function uncast(val, typ) {
return transform(val, typ, jsToJSONProps);
}
function u(...typs) {
return {
unionMembers: typs
};
}
function o(props, additional) {
return {
props,
additional
};
}
function r(name) {
return {
ref: name
};
}
const typeMap = {
PriceFeed: o([
{
json: "ema_price",
js: "ema_price",
typ: r("Price")
},
{
json: "id",
js: "id",
typ: ""
},
{
json: "metadata",
js: "metadata",
typ: u(undefined, r("PriceFeedMetadata"))
},
{
json: "price",
js: "price",
typ: r("Price")
},
{
json: "vaa",
js: "vaa",
typ: u(undefined, "")
}
], "any"),
Price: o([
{
json: "conf",
js: "conf",
typ: ""
},
{
json: "expo",
js: "expo",
typ: 0
},
{
json: "price",
js: "price",
typ: ""
},
{
json: "publish_time",
js: "publish_time",
typ: 0
}
], "any"),
PriceFeedMetadata: o([
{
json: "attestation_time",
js: "attestation_time",
typ: u(undefined, 0)
},
{
json: "emitter_chain",
js: "emitter_chain",
typ: 0
},
{
json: "prev_publish_time",
js: "prev_publish_time",
typ: u(undefined, 0)
},
{
json: "price_service_receive_time",
js: "price_service_receive_time",
typ: u(undefined, 0)
},
{
json: "sequence_number",
js: "sequence_number",
typ: u(undefined, 0)
},
{
json: "slot",
js: "slot",
typ: u(undefined, 0)
}
], "any")
};