S.P. IDEMIA created THRIFT-5442:
-----------------------------------
Summary: Missing feature for migration from 'csharp' to 'netstd'
target
Key: THRIFT-5442
URL: https://issues.apache.org/jira/browse/THRIFT-5442
Project: Thrift
Issue Type: Bug
Components: netstd - Library
Affects Versions: 0.14.2, 0.14.1, 0.14.0
Reporter: S.P. IDEMIA
Attachments: multi-recv.7z
The 'csharp' library and target have been deprecated in version 0.13.0, and
removed in version 0.14.0, with the indication that the 'netstd' target is its
replacement.
However, the netstd target is missing some features that were present in the
'csharp' target, which can make the migration difficult or impossible.
One such use case is when a server sends a sequence of replies for a single
command call by a client, e.g. to provide a stream of live data or progress
updates without constant polling from the client.
Here is a minimal example, where a device regularly sends information about its
firmware upgrade process, to provide a status display on the controlling
client, and to indicate when the device can be rebooted (on the new firmware).
{code:c++|title=minimal.thrift}
struct upgrade_progress {
1: required i8 percent;
2: optional string current_action;
3: optional bool finished = false;
}
service multi_recv
{
upgrade_progress firmware_upgrade(1: binary firmware);
}{code}
Here, the device (server) sends multiple replies, all of type
`upgrade_progress`, until the operation ends (for whatever reason).
On the PC (client) side, depending on the client software, we use either the
'csharp' or 'cpp' targets, relying on the public {{client.send_command_name}}
and {{client.recv_command_name}} methods which are generated alongside
{{client.command_name}}, allowing an easy handling of this kind of process:
{code:c#|title=Program.cs}
client.send_firmware_upgrade(firmware);
do
{
var res = client.recv_firmware_upgrade();
// Display progression using res.Percent & res.Current_action
upgrade_done = res.__isset.finished && res.Finished.Value;
} while (!upgrade_done);{code}
Unfortunately, the 'netstd' target does not generate these methods resulting in
an incomplete replacement of the 'csharp' target.
[^multi-recv.7z] contains the complete client for the described interface.
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