CoollZzz opened a new pull request, #126:
URL: https://github.com/apache/iotdb-extras/pull/126
## Description
This change adds native IoTDB table-model support for Grafana template
variables and enables dynamic node discovery for IoTDB dashboards.
### Changes
- Added support for variable queries using the following format:
```text
table:<database>:<SQL>
- Executes table-model variable queries through the IoTDB native RPC client.
- Keeps existing legacy variable-query behavior unchanged.
- Adds validation for:
- missing database names;
- missing SQL statements;
- invalid query formats;
- multi-column query results;
- IoTDB query execution failures.
- Converts the single-column IoTDB result into the string array expected by
Grafana variables.
- Skips NULL variable values and preserves the returned order.
- Adds support for the $__activeFrom macro.
- Uses a five-minute active-node window so that:
- nodes with recent samples appear dynamically;
- nodes that stop reporting disappear after the TTL expires;
- historical IoTDB samples are not deleted.
- Adds injectable execution and clock hooks to make the table-variable
behavior testable without a live IoTDB server.
Files Changed
- connectors/grafana-plugin/pkg/plugin/iotdb_resource_handler.go
- connectors/grafana-plugin/pkg/plugin/plugin.go
- connectors/grafana-plugin/pkg/plugin/table_query.go
- connectors/grafana-plugin/pkg/plugin/table_variable_test.go
Validation
The following cases are covered by tests:
- parsing valid table:<database>:<SQL> queries;
- rejecting malformed table-model variable queries;
- executing table-model variable queries;
- preserving variable values and order;
- skipping NULL values;
- coercing non-string values;
- rejecting multi-column results;
- propagating IoTDB execution errors;
- expanding $__activeFrom into the calculated liveness-window timestamp;
- handling dynamic instance discovery through the IoTDB validation database.
This change only modifies the Grafana IoTDB plugin variable-query path.
Prometheus dashboards, IoTDB dashboard JSON files, and bridge SQL conversion
logic are not included in this change.
```
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