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Introduce TSDB service (#31520)

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* Introduce TSDB service

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>
Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>
This commit is contained in:
Arve Knudsen
2021-03-08 07:02:49 +01:00
committed by GitHub
co-authored by Erik Sundell Will Browne Torkel Ödegaard Will Browne Zoltán Bedi
parent c899bf3592
commit b79e61656a
203 changed files with 5269 additions and 4776 deletions
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pkg/expr/graph.go
+9 -9
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@@ -28,7 +28,7 @@ type Node interface {
ID() int64 // ID() allows the gonum graph node interface to be fulfilled
NodeType() NodeType
RefID() string
Execute(c context.Context, vars mathexp.Vars) (mathexp.Results, error)
Execute(c context.Context, vars mathexp.Vars, s *Service) (mathexp.Results, error)
String() string
}
@@ -37,10 +37,10 @@ type DataPipeline []Node
// execute runs all the command/datasource requests in the pipeline return a
// map of the refId of the of each command
func (dp *DataPipeline) execute(c context.Context) (mathexp.Vars, error) {
func (dp *DataPipeline) execute(c context.Context, s *Service) (mathexp.Vars, error) {
vars := make(mathexp.Vars)
for _, node := range *dp {
res, err := node.Execute(c, vars)
res, err := node.Execute(c, vars, s)
if err != nil {
return nil, err
}
@@ -52,8 +52,8 @@ func (dp *DataPipeline) execute(c context.Context) (mathexp.Vars, error) {
// BuildPipeline builds a graph of the nodes, and returns the nodes in an
// executable order.
func buildPipeline(req *backend.QueryDataRequest) (DataPipeline, error) {
graph, err := buildDependencyGraph(req)
func (s *Service) buildPipeline(req *backend.QueryDataRequest) (DataPipeline, error) {
graph, err := s.buildDependencyGraph(req)
if err != nil {
return nil, err
}
@@ -67,8 +67,8 @@ func buildPipeline(req *backend.QueryDataRequest) (DataPipeline, error) {
}
// buildDependencyGraph returns a dependency graph for a set of queries.
func buildDependencyGraph(req *backend.QueryDataRequest) (*simple.DirectedGraph, error) {
graph, err := buildGraph(req)
func (s *Service) buildDependencyGraph(req *backend.QueryDataRequest) (*simple.DirectedGraph, error) {
graph, err := s.buildGraph(req)
if err != nil {
return nil, err
}
@@ -113,7 +113,7 @@ func buildNodeRegistry(g *simple.DirectedGraph) map[string]Node {
}
// buildGraph creates a new graph populated with nodes for every query.
func buildGraph(req *backend.QueryDataRequest) (*simple.DirectedGraph, error) {
func (s *Service) buildGraph(req *backend.QueryDataRequest) (*simple.DirectedGraph, error) {
dp := simple.NewDirectedGraph()
for _, query := range req.Queries {
@@ -139,7 +139,7 @@ func buildGraph(req *backend.QueryDataRequest) (*simple.DirectedGraph, error) {
case DatasourceName:
node, err = buildCMDNode(dp, rn)
default: // If it's not an expression query, it's a data source query.
node, err = buildDSNode(dp, rn, req.PluginContext.OrgID)
node, err = s.buildDSNode(dp, rn, req.PluginContext.OrgID)
}
if err != nil {
return nil, err