Add Python implementation of Grafana's DashboardExporter (WIP)

Author: amotl

grafana_client/model/DashboardExporter.ts renamed to grafana_client/export/DashboardExporter.ts

@@ -0,0 +1,372 @@
+# ruff: noqa: ERA001, W293, T201
+"""
+About
+=====
+Python implementation of Grafana's `DashboardExporter.ts`.
+
+State of the onion
+==================
+It has been started on 2022-02-15. It is a work in progress. Contributions are very much welcome!
+
+Synopsis
+========
+::
+
+    python grafana_client/model/dashboard.py play.grafana.org 000000012 | jq
+
+Parameters
+==========
+- `host`: The Grafana host name to connect to.
+- `dashboard uid`: The UID of the Grafana dashboard to export.
+
+References
+==========
+
+- https://community.grafana.com/t/export-dashboard-for-external-use-via-http-api/50716
+- https://github.com/panodata/grafana-client/issues/8
+- https://play.grafana.org/d/000000012
+"""
+
+import dataclasses
+import operator
+from typing import Any, Dict, List, Optional
+
+
+@dataclasses.dataclass
+class AnnotationQuery:
+    pass
+
+
+@dataclasses.dataclass
+class DashboardLink:
+    pass
+
+
+@dataclasses.dataclass
+class PanelModel:
+    pass
+
+
+@dataclasses.dataclass
+class Subscription:
+    pass
+
+
+@dataclasses.dataclass
+class DashboardModel:
+    """
+    https://github.com/grafana/grafana/blob/v8.3.6/public/app/features/dashboard/state/DashboardModel.ts
+    """
+
+    id: Any
+    uid: str
+    title: str
+    # autoUpdate: Any
+    # description: Any
+    tags: Any
+    style: Any
+    timezone: Any
+    editable: Any
+    # graphTooltip: DashboardCursorSync;
+    graphTooltip: Any
+    time: Any
+    liveNow: bool
+    # private originalTime: Any
+    timepicker: Any
+    templating: List[Any]
+    # private originalTemplating: Any
+    annotations: List[AnnotationQuery]
+    refresh: Any
+    # snapshot: Any
+    schemaVersion: int
+    version: int
+    # revision: int
+    links: List[DashboardLink]
+    gnetId: Any
+    panels: List[PanelModel]
+    # panelInEdit?: PanelModel;
+    # panelInView?: PanelModel;
+    fiscalYearStartMonth: int
+    # private panelsAffectedByVariableChange: number[] | null;
+    # private appEventsSubscription: Subscription;
+    # private lastRefresh: int
+
+    # Not in dashboard payload from API, but should be exported.
+    weekStart: Any = ""
+
+    def cleanUpRepeats(self):
+        pass
+
+    def getSaveModelClone(self):
+        return self
+
+    def processRepeats(self):
+        pass
+
+    def getVariables(self):
+        return self.templating["list"]
+
+    def asdict(self):
+        return dataclasses.asdict(self)
+
+
+@dataclasses.dataclass
+class DashboardExporter:
+    """
+    https://github.com/grafana/grafana/blob/v8.3.6/public/app/features/dashboard/components/DashExportModal/DashboardExporter.ts
+    """
+
+    inputs: Optional[List] = None
+    requires: Optional[Dict] = None
+    datasources: Optional[Dict] = None
+    promises: Optional[List[Any]] = None
+    variableLookup: Optional[Dict[str, Any]] = None
+    libraryPanels: Optional[Dict[str, Any]] = None
+
+    def makeExportable(self, dashboard: DashboardModel):
+        # clean up repeated rows and panels,
+        # this is done on the live real dashboard instance, not on a clone
+        # so we need to undo this
+        # this is pretty hacky and needs to be changed
+        dashboard.cleanUpRepeats()
+
+        saveModel = dashboard.getSaveModelClone()
+        saveModel.id = None
+
+        # undo repeat cleanup
+        dashboard.processRepeats()
+
+        self.inputs = []
+        self.requires = {}
+        self.datasources = {}
+        self.promises = []
+        self.variableLookup = {}
+        self.libraryPanels = {}
+
+        for variable in saveModel.getVariables():
+            self.variableLookup[variable.name] = variable
+
+        """
+        const templateizeDatasourceUsage = (obj: any) => {
+          let datasource: string = obj.datasource;
+          let datasourceVariable: any = null;
+        
+          // ignore data source properties that contain a variable
+          if (datasource && (datasource as any).uid) {
+            const uid = (datasource as any).uid as string;
+            if (uid.indexOf('$') === 0) {
+              datasourceVariable = variableLookup[uid.substring(1)];
+              if (datasourceVariable && datasourceVariable.current) {
+                datasource = datasourceVariable.current.value;
+              }
+            }
+          }
+        """
+
+        """
+        promises.push(
+          getDataSourceSrv()
+            .get(datasource)
+            .then((ds) => {
+              if (ds.meta?.builtIn) {
+                return;
+              }
+      
+              // add data source type to require list
+              requires['datasource' + ds.meta?.id] = {
+                type: 'datasource',
+                id: ds.meta.id,
+                name: ds.meta.name,
+                version: ds.meta.info.version || '1.0.0',
+              };
+      
+              // if used via variable we can skip templatizing usage
+              if (datasourceVariable) {
+                return;
+              }
+      
+              const refName = 'DS_' + ds.name.replace(' ', '_').toUpperCase();
+              datasources[refName] = {
+                name: refName,
+                label: ds.name,
+                description: '',
+                type: 'datasource',
+                pluginId: ds.meta?.id,
+                pluginName: ds.meta?.name,
+              };
+      
+              if (!obj.datasource || typeof obj.datasource === 'string') {
+                obj.datasource = '${' + refName + '}';
+              } else {
+                obj.datasource.uid = '${' + refName + '}';
+              }
+            })
+          );
+        };
+      
+        const processPanel = (panel: PanelModel) => {
+          if (panel.datasource !== undefined && panel.datasource !== null) {
+            templateizeDatasourceUsage(panel);
+          }
+      
+          if (panel.targets) {
+            for (const target of panel.targets) {
+              if (target.datasource !== undefined) {
+                templateizeDatasourceUsage(target);
+              }
+            }
+          }
+      
+          const panelDef: PanelPluginMeta = config.panels[panel.type];
+          if (panelDef) {
+            requires['panel' + panelDef.id] = {
+              type: 'panel',
+              id: panelDef.id,
+              name: panelDef.name,
+              version: panelDef.info.version,
+            };
+          }
+        };
+      
+        const processLibraryPanels = (panel: any) => {
+          if (isPanelModelLibraryPanel(panel)) {
+            const { libraryPanel, ...model } = panel;
+            const { name, uid } = libraryPanel;
+            if (!libraryPanels.has(uid)) {
+              libraryPanels.set(uid, { name, uid, kind: LibraryElementKind.Panel, model });
+            }
+          }
+        };
+      
+        // check up panel data sources
+        for (const panel of saveModel.panels) {
+          processPanel(panel);
+      
+          // handle collapsed rows
+          if (panel.collapsed !== undefined && panel.collapsed === true && panel.panels) {
+            for (const rowPanel of panel.panels) {
+              processPanel(rowPanel);
+            }
+          }
+        }
+      
+        // templatize template vars
+        for (const variable of saveModel.getVariables()) {
+          if (isQuery(variable)) {
+            templateizeDatasourceUsage(variable);
+            variable.options = [];
+            variable.current = {} as unknown as VariableOption;
+            variable.refresh =
+              variable.refresh !== VariableRefresh.never ? variable.refresh : VariableRefresh.onDashboardLoad;
+          }
+        }
+      
+        // templatize annotations vars
+        for (const annotationDef of saveModel.annotations.list) {
+          templateizeDatasourceUsage(annotationDef);
+        }
+        """
+
+        # add grafana version
+        self.requires["grafana"] = {
+            "type": "grafana",
+            "id": "grafana",
+            "name": "Grafana",
+            # FIXME: "version": config.buildInfo.version,
+            "version": "8.4.0-beta1",
+        }
+
+        """
+        return Promise.all(promises)
+        .then(() => {
+          each(datasources, (value: any) => {
+            inputs.push(value);
+          });
+      
+          // we need to process all panels again after all the promises are resolved
+          // so all data sources, variables and targets have been templateized when we process library panels
+          for (const panel of saveModel.panels) {
+            processLibraryPanels(panel);
+            if (panel.collapsed !== undefined && panel.collapsed === true && panel.panels) {
+              for (const rowPanel of panel.panels) {
+                processLibraryPanels(rowPanel);
+              }
+            }
+          }
+      
+          // templatize constants
+          for (const variable of saveModel.getVariables()) {
+            if (isConstant(variable)) {
+              const refName = 'VAR_' + variable.name.replace(' ', '_').toUpperCase();
+              inputs.push({
+                name: refName,
+                type: 'constant',
+                label: variable.label || variable.name,
+                value: variable.query,
+                description: '',
+              });
+              // update current and option
+              variable.query = '${' + refName + '}';
+              variable.current = {
+                value: variable.query,
+                text: variable.query,
+                selected: false,
+              };
+              variable.options = [variable.current];
+            }
+          }
+      
+        })
+        """
+
+        # make inputs and requires a top thing
+        newObj = dict(
+            __inputs=self.inputs,
+            __elements=list(self.libraryPanels.values()),
+            __requires=sorted(self.requires.values(), key=operator.itemgetter("id")),
+        )
+
+        # purge some attributes.
+        blocklist = ["gnetId"]
+        dashboard_data = dashboard.asdict()
+        for blockitem in blocklist:
+            if blockitem in dashboard_data:
+                del dashboard_data[blockitem]
+        newObj.update(dashboard_data)
+
+        return newObj
+
+
+def main():
+    import json
+    import sys
+    from typing import Dict
+
+    from grafana_client import GrafanaApi
+    from grafana_client.model.dashboard import DashboardExporter, DashboardModel
+
+    def jdump(data):
+        print(json.dumps(data, indent=4, sort_keys=True))
+
+    grafana_host = sys.argv[1]
+    dashboard_uid = sys.argv[2]
+
+    # Fetch dashboard.
+    grafana: GrafanaApi = GrafanaApi(None, host=grafana_host)
+    dashboard_raw: Dict = grafana.dashboard.get_dashboard(dashboard_uid)
+    # jdump(dashboard_raw)
+
+    # Converge to model class.
+    dashboard_data: Dict = dashboard_raw["dashboard"]
+    dashboard_model: DashboardModel = DashboardModel(**dashboard_data)
+    # jdump(dashboard_model.asdict())
+
+    # Represent.
+    exporter: DashboardExporter = DashboardExporter()
+    exported: Dict = exporter.makeExportable(dashboard_model)
+    # assert exported.templating.list[0].datasource == '${DS_GFDB}'
+    jdump(exported)
+
+
+if __name__ == "__main__":
+    main()