mirror of https://github.com/grafana/grafana.git
85 lines
2.8 KiB
Go
85 lines
2.8 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/plugins"
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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 plugins.ClientMiddleware that will
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// populate useful tracing headers on outgoing plugins.Client 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() plugins.ClientMiddleware {
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return plugins.ClientMiddlewareFunc(func(next plugins.Client) plugins.Client {
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return &TracingHeaderMiddleware{
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next: next,
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}
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})
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}
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type TracingHeaderMiddleware struct {
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next plugins.Client
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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.next.QueryData(ctx, req)
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}
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m.applyHeaders(ctx, req)
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return m.next.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.next.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.next.CheckHealth(ctx, req)
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}
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m.applyHeaders(ctx, req)
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return m.next.CheckHealth(ctx, req)
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}
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func (m *TracingHeaderMiddleware) CollectMetrics(ctx context.Context, req *backend.CollectMetricsRequest) (*backend.CollectMetricsResult, error) {
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return m.next.CollectMetrics(ctx, req)
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}
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func (m *TracingHeaderMiddleware) SubscribeStream(ctx context.Context, req *backend.SubscribeStreamRequest) (*backend.SubscribeStreamResponse, error) {
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return m.next.SubscribeStream(ctx, req)
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}
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func (m *TracingHeaderMiddleware) PublishStream(ctx context.Context, req *backend.PublishStreamRequest) (*backend.PublishStreamResponse, error) {
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return m.next.PublishStream(ctx, req)
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}
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func (m *TracingHeaderMiddleware) RunStream(ctx context.Context, req *backend.RunStreamRequest, sender *backend.StreamSender) error {
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return m.next.RunStream(ctx, req, sender)
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}
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