@lodestar/beacon-node/lib/chain/serializeState.js

A Typescript implementation of the beacon chain

var __addDisposableResource = (this && this.__addDisposableResource) || function (env, value, async) {
    if (value !== null && value !== void 0) {
        if (typeof value !== "object" && typeof value !== "function") throw new TypeError("Object expected.");
        var dispose, inner;
        if (async) {
            if (!Symbol.asyncDispose) throw new TypeError("Symbol.asyncDispose is not defined.");
            dispose = value[Symbol.asyncDispose];
        }
        if (dispose === void 0) {
            if (!Symbol.dispose) throw new TypeError("Symbol.dispose is not defined.");
            dispose = value[Symbol.dispose];
            if (async) inner = dispose;
        }
        if (typeof dispose !== "function") throw new TypeError("Object not disposable.");
        if (inner) dispose = function() { try { inner.call(this); } catch (e) { return Promise.reject(e); } };
        env.stack.push({ value: value, dispose: dispose, async: async });
    }
    else if (async) {
        env.stack.push({ async: true });
    }
    return value;
};
var __disposeResources = (this && this.__disposeResources) || (function (SuppressedError) {
    return function (env) {
        function fail(e) {
            env.error = env.hasError ? new SuppressedError(e, env.error, "An error was suppressed during disposal.") : e;
            env.hasError = true;
        }
        var r, s = 0;
        function next() {
            while (r = env.stack.pop()) {
                try {
                    if (!r.async && s === 1) return s = 0, env.stack.push(r), Promise.resolve().then(next);
                    if (r.dispose) {
                        var result = r.dispose.call(r.value);
                        if (r.async) return s |= 2, Promise.resolve(result).then(next, function(e) { fail(e); return next(); });
                    }
                    else s |= 1;
                }
                catch (e) {
                    fail(e);
                }
            }
            if (s === 1) return env.hasError ? Promise.reject(env.error) : Promise.resolve();
            if (env.hasError) throw env.error;
        }
        return next();
    };
})(typeof SuppressedError === "function" ? SuppressedError : function (error, suppressed, message) {
    var e = new Error(message);
    return e.name = "SuppressedError", e.error = error, e.suppressed = suppressed, e;
});
/*
 * Serialize state using the BufferPool if provided.
 */
export async function serializeState(state, source, processFn, bufferPool) {
    const size = state.serializedSize();
    let stateBytes = null;
    if (bufferPool) {
        const env_1 = { stack: [], error: void 0, hasError: false };
        try {
            const bufferWithKey = __addDisposableResource(env_1, bufferPool.alloc(size, source), false);
            if (bufferWithKey) {
                stateBytes = bufferWithKey.buffer;
                const dataView = new DataView(stateBytes.buffer, stateBytes.byteOffset, stateBytes.byteLength);
                state.serializeToBytes({ uint8Array: stateBytes, dataView }, 0);
                // Await to ensure buffer is not released back to pool until processFn completes
                return await processFn(stateBytes);
            }
        }
        catch (e_1) {
            env_1.error = e_1;
            env_1.hasError = true;
        }
        finally {
            __disposeResources(env_1);
        }
        // release the buffer back to the pool automatically
    }
    // we already have metrics in BufferPool so no need to do it here
    stateBytes = state.serialize();
    return processFn(stateBytes);
}
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