public async Task Readme(string configFile)
{
// Load configuration
var config = BigtableConfig.Load(configFile);
// Create credentials
var credentials = await BigtableCredentials.UseApplicationDefaultCredentialsAsync();
// Data client
using (var dataClient = new BigDataClient(credentials, config))
{
// Scan myTable
var rows = await dataClient.GetRowsAsync(
tableName : "myTable",
startKey : "abc",
endKey : "def",
rowLimit : 20
);
// Show the user
foreach (var row in rows)
{
// Write key to console
Console.WriteLine("Key: " + row.KeyString);
// Iterate the families which were returned
foreach (var family in row.FieldsByFamily)
{
// Results are organized by family
var familyName = family.Key;
// Iterate the fields in this family
foreach (var field in family.Value)
{
var fieldName = field.Key;
// Iterate the versions of the field
foreach (var cell in field.Value)
{
// Write to console
Console.WriteLine("{0}:{1} = {2}", familyName, cell.ColumnName, cell.StringValue);
}
}
}
}
}
}
public static async Task Run()
{
// Disable Grpc logging
GrpcEnvironment.DisableLogging();
try
{
// Create config
var config = Utilities.GetConfig();
// Create credentials
var credentials = await BigtableCredentials.UseApplicationDefaultCredentialsAsync();
// Admin client
using (var adminClient = new BigAdminClient(credentials, config))
{
// Get tables
var tables = (await adminClient.ListTablesAsync()).ToArray();
// Ensure pricing table exists
if (tables.All(t => t.Name != Constants.PricingTable))
{
// Inform user
CommandLine.InformUser("Setup", "Missing example table. Please run the Examples.Bootstrap project.");
// Hard stop
return;
}
// Show user
CommandLine.DisplayTables(tables);
}
// Wait for keypress
CommandLine.WaitForUserAndThen("scan for rows");
// Data client
using (var dataClient = new BigDataClient(credentials, config))
{
// Target
var pricingTable = new BigTable(Constants.PricingTable);
// Scan pricing table
var pricing = await dataClient.GetRowsAsync(pricingTable, Constants.ScanKeyStart, Constants.ScanKeyEnd, Constants.ScanLimit);
// Show the user
CommandLine.DisplayRows(pricing);
// Wait for keypress
CommandLine.WaitForUserAndThen("observe rows");
// Test observables
var waitSource = new CancellationTokenSource();
// ReSharper disable once MethodSupportsCancellation
var waitForObservation = Task.Run(() => Task.Delay(-1, waitSource.Token));
// Create a subscriber
var subscriber = new TestSubscriber(() => waitSource.Cancel());
// ReSharper disable once MethodSupportsCancellation
var observable = dataClient.ObserveRows(pricingTable, Constants.ScanKeyStart, Constants.ScanKeyEnd, Constants.ScanLimit);
using (observable.Subscribe(subscriber))
{
//await Task.Delay(1000);
Task.WaitAny(waitForObservation);
}
// Wait for keypress
CommandLine.WaitForUserAndThen("seek for row");
// Seek for data
var row = await dataClient.GetRowAsync(pricingTable, Constants.SeekKey);
// Show the user
CommandLine.DisplayRows(new[] { row });
}
}
catch (Exception exception)
{
CommandLine.InformUser("Oops", "Example didn't work out as planned");
CommandLine.RenderException(exception);
}
finally
{
// All done
CommandLine.WaitForUserAndThen("exit");
}
}