tradingview-api-adapter/src/adapters/QuoteSessionAdapter.ts

API Adapter for real-time market data as quoted prices and symbol ticker details from Tradingview

import {QuoteSession} from "../Client";
import {EventEmitter} from "events";

interface ParameterFields {
    n: string,
    s: string,
    errmsg?: string,
    v: object
}

export class QuoteSessionAdapter extends EventEmitter{

    private firstLoad = true;

    constructor(
        private readonly $bridge: QuoteSession,
        private readonly $isMultiChannel = false
    ) {
        super();
        this.$bridge.listener(params => this.handleSessionListener(params));

        this.launchSession();
    }

    /** Section of the protected code **/

    public setFields(field: string): void;
    public setFields(fieldList: Set<string>): void;
    public setFields(fieldList: string | Set<string>): void {
        if(typeof fieldList === 'string'){
            this.$bridge.send("quote_set_fields", [fieldList]);
        } else {
            this.$bridge.send("quote_set_fields", Array.from(fieldList));
        }
    }

    public addPairs(pair: string): void;
    public addPairs(pairList: Set<string>): void;
    public addPairs(pairList: string | Set<string>): void {
        if(typeof pairList === 'string'){
            this.$bridge.send('quote_add_symbols', [pairList]);
        } else {
            this.$bridge.send('quote_add_symbols', Array.from(pairList));

        }

        // this.$bridge.send('quote_add_symbols', [`={"adjustment":"splits","symbol":"${(pairList[0])}"}`])
        // this.$client.send("quote_fast_symbols", [this.sessionID, `={"adjustment":"splits","symbol":"${(pairs[0])}"}`])

    }

    public removePairs(pair: string): void;
    public removePairs(pairList: Set<string>): void;
    public removePairs(pairList: string | Set<string>): void {
        if(typeof pairList === 'string'){
            this.$bridge.send('quote_remove_symbols', [pairList]);
        } else {
            this.$bridge.send('quote_remove_symbols', Array.from(pairList));
        }
    }

    /** End section of the protected code **/


    /** Section of the system code **/

    private launchSession(): void {
        this.$bridge.send("quote_create_session", [])
    }

    private handleSessionListener(sessionData: {params: Array<ParameterFields>, uploaded?: boolean}): void {
        let quotedData = {};

        /*!!!!currently implemented check for a session with a single quote*/

        sessionData.params.forEach(param => {
            switch (param.s) {
                case 'error':
                    console.error("Error", param.errmsg); //here I will need to add an error throw event
                    break;
                case 'ok':
                    if(this.$isMultiChannel){
                        const separatedPair = param.n.split(':');

                        if(separatedPair[0] in quotedData){
                            // @ts-ignore
                            if(separatedPair[1] in quotedData[separatedPair[0]]){
                                // @ts-ignore
                                Object.assign(quotedData[separatedPair[0]][separatedPair[1]], param.v);
                            } else {
                                // @ts-ignore
                                quotedData[separatedPair[0]][separatedPair[1]] = param.v;
                            }

                        } else {
                            // @ts-ignore
                            quotedData[separatedPair[0]] = {};
                            // @ts-ignore
                            quotedData[separatedPair[0]][separatedPair[1]] = param.v;
                        }
                    } else {
                        Object.assign(quotedData, param.v);
                    }
                    break;
                default:
                    console.log('From default', param)
            }
        })


        this.emit('shaped_session_data', quotedData, {
            firstLoad: this.firstLoad,
            reload: !!sessionData.uploaded && !this.firstLoad
            // потом нужно будет доработать флаги (учесть чувствительность полей котировки)
        });


        if(this.firstLoad && !!sessionData.uploaded) this.firstLoad = false;
    }


    /** End section of the system code **/




}