private void InitializeExponentialBackOff(ConfigurableHttpClient client, IFcmClientSettings settings)
{
// The Maximum Number of Retries is limited to 3 per default for a ConfigurableHttpClient. This is
// somewhat weird, because the ExponentialBackOff Algorithm is initialized with 10 Retries per default.
//
// Somehow the NumTries seems to be the limiting factor here, so it basically overrides anything you
// are going to write in the Exponential Backoff Handler.
client.MessageHandler.NumTries = settings.ExponentialBackOffSettings.MaxNumberOfRetries;
// Create the Default BackOff Algorithm:
var backoff = new ExponentialBackOff(settings.ExponentialBackOffSettings.DeltaBackOff, settings.ExponentialBackOffSettings.MaxNumberOfRetries);
// Create the Initializer. Make sure to set the Maximum Timespan between two Requests. It
// is 16 Seconds per Default:
var backoffInitializer = new BackOffHandler.Initializer(backoff)
{
MaxTimeSpan = settings.ExponentialBackOffSettings.MaxTimeSpan
};
// Now create the Handler:
var initializer = new ExponentialBackOffInitializer(ExponentialBackOffPolicy.UnsuccessfulResponse503, () => new BackOffHandler(backoffInitializer));
// And finally append the BackOff Handler, which reacts to 503 Requests:
initializer.Initialize(client);
}
private void InitializeExponentialBackOff(ConfigurableHttpClient client, IFcmClientSettings settings)
{
// The Maximum Number of Retries is limited to 3 per default for a ConfigurableHttpClient. This is
// somewhat weird, because the ExponentialBackOff Algorithm is initialized with 10 Retries per default.
//
// Somehow the NumTries seems to be the limiting factor here, so it basically overrides anything you
// are going to write in the Exponential Backoff Handler.
client.MessageHandler.NumTries = settings.ExponentialBackOffSettings.MaxNumberOfRetries;
}
public FcmClient(IFcmClientSettings settings, IFcmHttpClient httpClient)
{
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (httpClient == null)
{
throw new ArgumentNullException("httpClient");
}
this.settings = settings;
this.httpClient = httpClient;
}
public FcmClient(IFcmClientSettings settings, IJsonSerializer serializer, IFcmHttpClient httpClient)
{
if (settings == null)
{
throw new ArgumentNullException(nameof(settings));
}
if (httpClient == null)
{
throw new ArgumentNullException(nameof(httpClient));
}
this.serializer = serializer;
this.settings = settings;
this.httpClient = httpClient;
}
public FcmHttpClient(IFcmClientSettings settings, IJsonSerializer serializer, IHttpClientFactory httpClientFactory, CreateHttpClientArgs httpClientArgs)
{
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (serializer == null)
{
throw new ArgumentNullException("serializer");
}
this.settings = settings;
this.client = httpClientFactory.CreateHttpClient(httpClientArgs);
this.serializer = serializer;
this.credential = CreateServiceAccountCredential(httpClientFactory, settings);
InitializeExponentialBackOff(client, settings);
}
public FcmHttpClient(IFcmClientSettings settings, HttpClient client, IJsonSerializer serializer)
{
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (client == null)
{
throw new ArgumentNullException("client");
}
if (serializer == null)
{
throw new ArgumentNullException("serializer");
}
this.settings = settings;
this.client = client;
this.serializer = serializer;
}
private static CreateHttpClientArgs CreateDefaultHttpClientArgs(IFcmClientSettings settings)
{
if (settings == null)
{
throw new ArgumentNullException("settings", "Settings are needed to create the Default HttpClientArgs");
}
var args = new CreateHttpClientArgs();
// Create the Default BackOff Algorithm:
var backoff = new ExponentialBackOff(settings.ExponentialBackOffSettings.DeltaBackOff, settings.ExponentialBackOffSettings.MaxNumberOfRetries);
// Create the Initializer. Make sure to set the Maximum Timespan between two Requests. It is 16 Seconds per Default:
var backoffInitializer = new BackOffHandler.Initializer(backoff)
{
MaxTimeSpan = settings.ExponentialBackOffSettings.MaxTimeSpan
};
args.Initializers.Add(new ExponentialBackOffInitializer(ExponentialBackOffPolicy.UnsuccessfulResponse503, () => new BackOffHandler(backoffInitializer)));
return(args);
}
public FcmHttpClient(IFcmClientSettings settings, ConfigurableHttpClient client, IJsonSerializer serializer)
{
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (client == null)
{
throw new ArgumentNullException("client");
}
if (serializer == null)
{
throw new ArgumentNullException("serializer");
}
this.settings = settings;
this.client = client;
this.serializer = serializer;
this.credential = CreateServiceAccountCredential(client, settings);
}
private ServiceAccountCredential CreateServiceAccountCredential(ConfigurableHttpClient client, IFcmClientSettings settings)
{
var serviceAccountCredential = GoogleCredential.FromJson(settings.Credentials)
// We need the Messaging Scope:
.CreateScoped("https://www.googleapis.com/auth/firebase.messaging")
// Cast to the ServiceAccountCredential:
.UnderlyingCredential as ServiceAccountCredential;
if (serviceAccountCredential == null)
{
throw new Exception($"Error creating ServiceAccountCredential from JSON File {settings.Credentials}");
}
serviceAccountCredential.Initialize(client);
return(serviceAccountCredential);
}
public FcmHttpClient(IFcmClientSettings settings)
: this(settings, new HttpClient(), JsonSerializer.Default)
{
}
public FcmHttpClient(IFcmClientSettings settings, IHttpClientFactory httpClientFactory, CreateHttpClientArgs httpClientArgs)
: this(settings, JsonSerializer.Default, httpClientFactory, httpClientArgs)
{
}
public FcmHttpClient(IFcmClientSettings settings)
: this(settings, JsonSerializer.Default, new HttpClientFactory(), CreateDefaultHttpClientArgs(settings))
{
}
private ServiceAccountCredential CreateServiceAccountCredential(IHttpClientFactory httpClientFactory, IFcmClientSettings settings)
{
var serviceAccountCredential = GoogleCredential.FromJson(settings.Credentials)
// We need the Messaging Scope:
.CreateScoped("https://www.googleapis.com/auth/firebase.messaging")
// Cast to the ServiceAccountCredential:
.UnderlyingCredential as ServiceAccountCredential;
if (serviceAccountCredential == null)
{
throw new Exception($"Error creating ServiceAccountCredential from JSON File {settings.Credentials}");
}
var initializer = new ServiceAccountCredential.Initializer(serviceAccountCredential.Id, serviceAccountCredential.TokenServerUrl)
{
User = serviceAccountCredential.User,
AccessMethod = serviceAccountCredential.AccessMethod,
Clock = serviceAccountCredential.Clock,
Key = serviceAccountCredential.Key,
Scopes = serviceAccountCredential.Scopes,
HttpClientFactory = httpClientFactory
};
return(new ServiceAccountCredential(initializer));
}
public FcmClient(IFcmClientSettings settings, IJsonSerializer serializer)
: this(settings, serializer, new FcmHttpClient(settings))
{
}
public FcmHttpClient(IFcmClientSettings settings, Google.Apis.Http.IHttpClientFactory httpClientFactory)
: this(settings, JsonSerializer.Default, httpClientFactory, CreateDefaultHttpClientArgs(settings))
{
}
public FcmClient(IFcmClientSettings settings, IFcmHttpClient fcmHttpClient)
: this(settings, JsonSerializer.Default, fcmHttpClient)
{
}
public FcmHttpClient(IFcmClientSettings settings)
: this(settings, new ConfigurableHttpClient(new ConfigurableMessageHandler(new HttpClientHandler())), JsonSerializer.Default)
{
}
public FcmClient(IFcmClientSettings settings)
: this(settings, new FcmHttpClient(settings))
{
}
