68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
package clientmiddleware
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import (
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"context"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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"github.com/grafana/grafana/pkg/services/contexthandler"
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"github.com/grafana/grafana/pkg/services/query"
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)
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// NewTracingHeaderMiddleware creates a new backend.HandlerMiddleware that will
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// populate useful tracing headers on outgoing backend.Handler and HTTP
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// requests.
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// Tracing headers are X-Datasource-Uid, X-Dashboard-Uid,
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// X-Panel-Id, X-Grafana-Org-Id.
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func NewTracingHeaderMiddleware() backend.HandlerMiddleware {
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return backend.HandlerMiddlewareFunc(func(next backend.Handler) backend.Handler {
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return &TracingHeaderMiddleware{
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BaseHandler: backend.NewBaseHandler(next),
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}
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})
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}
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type TracingHeaderMiddleware struct {
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backend.BaseHandler
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}
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func (m *TracingHeaderMiddleware) applyHeaders(ctx context.Context, req backend.ForwardHTTPHeaders) {
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reqCtx := contexthandler.FromContext(ctx)
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// If no HTTP request context then skip middleware.
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if req == nil || reqCtx == nil || reqCtx.Req == nil {
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return
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}
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var headersList = []string{query.HeaderQueryGroupID, query.HeaderPanelID, query.HeaderDashboardUID, query.HeaderDatasourceUID, query.HeaderFromExpression, `X-Grafana-Org-Id`, query.HeaderPanelPluginId}
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for _, headerName := range headersList {
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gotVal := reqCtx.Req.Header.Get(headerName)
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if gotVal == "" {
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continue
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}
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req.SetHTTPHeader(headerName, gotVal)
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}
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}
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func (m *TracingHeaderMiddleware) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
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if req == nil {
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return m.BaseHandler.QueryData(ctx, req)
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}
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m.applyHeaders(ctx, req)
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return m.BaseHandler.QueryData(ctx, req)
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}
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func (m *TracingHeaderMiddleware) CallResource(ctx context.Context, req *backend.CallResourceRequest, sender backend.CallResourceResponseSender) error {
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return m.BaseHandler.CallResource(ctx, req, sender)
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}
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func (m *TracingHeaderMiddleware) CheckHealth(ctx context.Context, req *backend.CheckHealthRequest) (*backend.CheckHealthResult, error) {
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if req == nil {
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return m.BaseHandler.CheckHealth(ctx, req)
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}
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m.applyHeaders(ctx, req)
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return m.BaseHandler.CheckHealth(ctx, req)
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}
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