/// <summary>
/// Creates a cursor to paginate large data sets.
/// </summary>
/// <param name="parameters">The contact list parameters used to specify the contacts and fields to include.</param>
/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
/// <returns></returns>
public Task <ContactCursor> CreateCursorAsync(ContactListParameters parameters, CancellationToken cancellationToken = default)
{
Preconditions.NotNull(parameters, nameof(parameters));
var queryParameters = new QueryParameters(
new QueryParameter("limit", "1"),
new QueryParameter("cursorType", "randomAccess"));
return(PostAsync(null, queryParameters.ToString(), JsonStreamContent.Create(parameters), nameof(CreateCursorAsync), null, cancellationToken, async response =>
{
var headers = response.Headers;
const string countHeaderName = "x-total-count";
if (!headers.TryGetValues(countHeaderName, out var counts))
{
throw await EncompassApiException.CreateAsync($"{nameof(CreateCursorAsync)} missing {countHeaderName} header", response).ConfigureAwait(false);
}
var countString = counts.First();
if (!int.TryParse(countString, out var count) || count < 0)
{
throw await EncompassApiException.CreateAsync($"{nameof(CreateCursorAsync)} invalid {countHeaderName} header value", response).ConfigureAwait(false);
}
string?cursorId = null;
if (count > 0)
{
const string cursorIdHeaderName = "x-cursor";
if (!headers.TryGetValues(cursorIdHeaderName, out var cursorIds))
{
throw await EncompassApiException.CreateAsync($"{nameof(CreateCursorAsync)} missing {cursorIdHeaderName} header", response).ConfigureAwait(false);
}
cursorId = cursorIds.First();
}
return new ContactCursor(this, Client, cursorId, count, parameters.Fields);
}));
}
/// <inheritdoc/>
public Task <List <ContactData> > GetContactListAsync(ContactListParameters parameters, int?start = null, int?limit = null, CancellationToken cancellationToken = default)
{
Preconditions.NotNull(parameters, nameof(parameters));
var queryParameters = new QueryParameters();
if (start.HasValue)
{
queryParameters.Add("start", start.ToString());
}
if (limit.HasValue)
{
queryParameters.Add("limit", limit.ToString());
}
return(PostAsync <List <ContactData> >(null, queryParameters.ToString(), JsonStreamContent.Create(parameters), nameof(GetContactListAsync), null, cancellationToken));
}
async Task <IContactCursor> IContactSelector.CreateCursorAsync(ContactListParameters parameters, CancellationToken cancellationToken) => await CreateCursorAsync(parameters, cancellationToken).ConfigureAwait(false);