BatchGet.ino

/**
 * SYNTAX:
 *
 * String Firestore::Documents::batchGet(<AsyncClient>, <Firestore::Parent>, <BatchGetDocumentOptions>);
 *
 * <AsyncClient> - The async client.
 * <Firestore::Parent> - The Firestore::Parent object included project Id and database Id in its constructor.
 * <BatchGetDocumentOptions> - The BatchGetDocumentOptions object which provided the member functions to construct the requst body.
 *
 * The Firebase project Id should be only the name without the firebaseio.com.
 * The Firestore database id should be (default) or empty "".
 *
 * This function returns response payload when task is complete.
 *
 * The following are the BatchGetDocumentOptions member functions.
 *
 * BatchGetDocumentOptions::documents - Adding the document path to read.
 * BatchGetDocumentOptions::mask - Setting the mask fields to return. If not set, returns all fields.
 *
 * If the document has a field that is not present in this mask, that field will not be returned in the response. Use comma (,) to separate between the field names.
 *
 * The union field consistency_selector
 *
 * BatchGetDocumentOptions::transaction - Rreading the document in a transaction. A base64-encoded string.
 * BatchGetDocumentOptions::newTransaction - Creating the transaction.
 * BatchGetDocumentOptions::readTime - Setting the documents as they were at the given time. This may not be older than 270 seconds.
 *
 * The complete usage guidelines, please visit https://github.com/mobizt/FirebaseClient
 */

#include <Arduino.h>
#if defined(ESP32) || defined(ARDUINO_RASPBERRY_PI_PICO_W) || defined(ARDUINO_GIGA)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#elif __has_include(<WiFiNINA.h>) || defined(ARDUINO_NANO_RP2040_CONNECT)
#include <WiFiNINA.h>
#elif __has_include(<WiFi101.h>)
#include <WiFi101.h>
#elif __has_include(<WiFiS3.h>) || defined(ARDUINO_UNOWIFIR4)
#include <WiFiS3.h>
#elif __has_include(<WiFiC3.h>) || defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif __has_include(<WiFi.h>)
#include <WiFi.h>
#endif

#include <FirebaseClient.h>

#define WIFI_SSID "WIFI_AP"
#define WIFI_PASSWORD "WIFI_PASSWORD"

// The API key can be obtained from Firebase console > Project Overview > Project settings.
#define API_KEY "Web_API_KEY"

/**
 * This information can be taken from the service account JSON file.
 *
 * To download service account file, from the Firebase console, goto project settings,
 * select "Service accounts" tab and click at "Generate new private key" button
 */
#define FIREBASE_PROJECT_ID "PROJECT_ID"
#define FIREBASE_CLIENT_EMAIL "CLIENT_EMAIL"
const char PRIVATE_KEY[] PROGMEM = "-----BEGIN PRIVATE KEY-----XXXXXXXXXXXX-----END PRIVATE KEY-----\n";

void authHandler();

void timeStatusCB(uint32_t &ts);

void printResult(AsyncResult &aResult);

void printError(int code, const String &msg);

DefaultNetwork network; // initilize with boolean parameter to enable/disable network reconnection

// ServiceAuth is required.
ServiceAuth sa_auth(timeStatusCB, FIREBASE_CLIENT_EMAIL, FIREBASE_PROJECT_ID, PRIVATE_KEY, 3000 /* expire period in seconds (<= 3600) */);

FirebaseApp app;

#if defined(ESP32) || defined(ESP8266) || defined(ARDUINO_RASPBERRY_PI_PICO_W)
#include <WiFiClientSecure.h>
WiFiClientSecure ssl_client;
#elif defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_UNOWIFIR4) || defined(ARDUINO_GIGA) || defined(ARDUINO_PORTENTA_C33) || defined(ARDUINO_NANO_RP2040_CONNECT)
#include <WiFiSSLClient.h>
WiFiSSLClient ssl_client;
#endif

using AsyncClient = AsyncClientClass;

AsyncClient aClient(ssl_client, getNetwork(network));

Firestore::Documents Docs;

AsyncResult aResult_no_callback;

bool taskCompleted = false;

void setup()
{

    Serial.begin(115200);
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

    Serial.print("Connecting to Wi-Fi");
    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.print(".");
        delay(300);
    }
    Serial.println();
    Serial.print("Connected with IP: ");
    Serial.println(WiFi.localIP());
    Serial.println();

    Firebase.printf("Firebase Client v%s\n", FIREBASE_CLIENT_VERSION);

    Serial.println("Initializing app...");

#if defined(ESP32) || defined(ESP8266) || defined(PICO_RP2040)
    ssl_client.setInsecure();
#if defined(ESP8266)
    ssl_client.setBufferSizes(4096, 1024);
#endif
#endif

    initializeApp(aClient, app, getAuth(sa_auth), aResult_no_callback);

    authHandler();

    // Binding the FirebaseApp for authentication handler.
    // To unbind, use Docs.resetApp();
    app.getApp<Firestore::Documents>(Docs);

    // In case setting the external async result to the sync task (optional)
    // To unset, use unsetAsyncResult().
    aClient.setAsyncResult(aResult_no_callback);
}

void loop()
{
    authHandler();

    Docs.loop();

    if (app.ready() && !taskCompleted)
    {
        taskCompleted = true;

        Serial.println("Get multiple documents...");

        BatchGetDocumentOptions options;
        options.documents("info/countries");
        options.documents("a0/b0");
        options.documents("test_collection/test_document");
        options.mask(DocumentMask("Singapore.population,key1"));

        // You can set the content of options object directly with options.setContent("your content")

        String payload = Docs.batchGet(aClient, Firestore::Parent(FIREBASE_PROJECT_ID), options);

        if (aClient.lastError().code() == 0)
            Serial.println(payload);
        else
            printError(aClient.lastError().code(), aClient.lastError().message());
    }
}

void authHandler()
{
    // Blocking authentication handler with timeout
    unsigned long ms = millis();
    while (app.isInitialized() && !app.ready() && millis() - ms < 120 * 1000)
    {
        // The JWT token processor required for ServiceAuth and CustomAuth authentications.
        // JWT is a static object of JWTClass and it's not thread safe.
        // In multi-threaded operations (multi-FirebaseApp), you have to define JWTClass for each FirebaseApp,
        // and set it to the FirebaseApp via FirebaseApp::setJWTProcessor(<JWTClass>), before calling initializeApp.
        JWT.loop(app.getAuth());
        printResult(aResult_no_callback);
    }
}

void timeStatusCB(uint32_t &ts)
{
#if defined(ESP8266) || defined(ESP32) || defined(CORE_ARDUINO_PICO)
    if (time(nullptr) < FIREBASE_DEFAULT_TS)
    {

        configTime(3 * 3600, 0, "pool.ntp.org");
        while (time(nullptr) < FIREBASE_DEFAULT_TS)
        {
            delay(100);
        }
    }
    ts = time(nullptr);
#elif __has_include(<WiFiNINA.h>) || __has_include(<WiFi101.h>)
    ts = WiFi.getTime();
#endif
}

void printResult(AsyncResult &aResult)
{
    if (aResult.isEvent())
    {
        Firebase.printf("Event task: %s, msg: %s, code: %d\n", aResult.uid().c_str(), aResult.appEvent().message().c_str(), aResult.appEvent().code());
    }

    if (aResult.isDebug())
    {
        Firebase.printf("Debug task: %s, msg: %s\n", aResult.uid().c_str(), aResult.debug().c_str());
    }

    if (aResult.isError())
    {
        Firebase.printf("Error task: %s, msg: %s, code: %d\n", aResult.uid().c_str(), aResult.error().message().c_str(), aResult.error().code());
    }

    if (aResult.available())
    {
        Firebase.printf("task: %s, payload: %s\n", aResult.uid().c_str(), aResult.c_str());
    }
}

void printError(int code, const String &msg)
{
    Firebase.printf("Error, msg: %s, code: %d\n", msg.c_str(), code);
}