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frontend_diff.go
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/
frontend_diff.go
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package frontend
import (
"context"
"connectrpc.com/connect"
"github.com/grafana/dskit/tenant"
"golang.org/x/sync/errgroup"
querierv1 "github.com/grafana/pyroscope/api/gen/proto/go/querier/v1"
"github.com/grafana/pyroscope/api/gen/proto/go/querier/v1/querierv1connect"
phlaremodel "github.com/grafana/pyroscope/pkg/model"
"github.com/grafana/pyroscope/pkg/util/connectgrpc"
"github.com/grafana/pyroscope/pkg/validation"
)
func (f *Frontend) Diff(ctx context.Context,
c *connect.Request[querierv1.DiffRequest]) (
*connect.Response[querierv1.DiffResponse], error,
) {
ctx = connectgrpc.WithProcedure(ctx, querierv1connect.QuerierServiceDiffProcedure)
g, ctx := errgroup.WithContext(ctx)
tenantIDs, err := tenant.TenantIDs(ctx)
if err != nil {
return nil, connect.NewError(connect.CodeInvalidArgument, err)
}
maxNodes := c.Msg.Left.GetMaxNodes()
if n := c.Msg.Right.GetMaxNodes(); n > maxNodes {
maxNodes = n
}
maxNodes, err = validation.ValidateMaxNodes(f.limits, tenantIDs, maxNodes)
if err != nil {
return nil, connect.NewError(connect.CodeInvalidArgument, err)
}
c.Msg.Left.MaxNodes = &maxNodes
c.Msg.Right.MaxNodes = &maxNodes
var left, right *phlaremodel.Tree
g.Go(func() error {
resp, err := f.SelectMergeStacktraces(ctx, connect.NewRequest(c.Msg.Left))
if err != nil {
return err
}
m := phlaremodel.NewFlameGraphMerger()
m.MergeFlameGraph(resp.Msg.Flamegraph)
left = m.Tree()
return err
})
g.Go(func() error {
resp, err := f.SelectMergeStacktraces(ctx, connect.NewRequest(c.Msg.Right))
if err != nil {
return err
}
m := phlaremodel.NewFlameGraphMerger()
m.MergeFlameGraph(resp.Msg.Flamegraph)
right = m.Tree()
return err
})
if err := g.Wait(); err != nil {
return nil, err
}
diff, err := phlaremodel.NewFlamegraphDiff(left, right, maxNodes)
if err != nil {
return nil, connect.NewError(connect.CodeInvalidArgument, err)
}
return connect.NewResponse(&querierv1.DiffResponse{Flamegraph: diff}), nil
}