Documentation
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Overview ¶
Package datasource provides utilities for data source plugins.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type QueryTypeHandlerFunc ¶
type QueryTypeHandlerFunc func(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error)
QueryTypeHandlerFunc is an adapter to allow the use of ordinary functions as backend.QueryDataHandler. If f is a function with the appropriate signature, QueryTypeHandlerFunc(f) is a Handler that calls f.
func (QueryTypeHandlerFunc) QueryData ¶
func (fn QueryTypeHandlerFunc) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error)
QueryData calls f(ctx, req).
type QueryTypeMux ¶
type QueryTypeMux struct {
// contains filtered or unexported fields
}
QueryTypeMux is a query type multiplexer.
Example ¶
mux := NewQueryTypeMux()
mux.HandleFunc("queryTypeA", func(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
// handle queryTypeA
return nil, nil
})
mux.HandleFunc("queryTypeB", func(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
// handle queryTypeB
return nil, nil
})
_ = backend.ServeOpts{
QueryDataHandler: mux,
}
func NewQueryTypeMux ¶
func NewQueryTypeMux() *QueryTypeMux
NewQueryTypeMux allocates and returns a new QueryTypeMux.
func (*QueryTypeMux) Handle ¶
func (mux *QueryTypeMux) Handle(queryType string, handler backend.QueryDataHandler)
Handle registers the handler for the given query type.
Providing an empty queryType registers the handler as a fallback handler that will be called when query type doesn't match any registered handlers. If handler is nil, Handle panics. If a handler already exists for queryType, Handle panics.
func (*QueryTypeMux) HandleFunc ¶
func (mux *QueryTypeMux) HandleFunc(queryType string, handler func(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error))
HandleFunc registers the handler function for the given query type.
Providing an empty queryType registers the handler as a fallback handler that will be called when query type doesn't match any registered handlers. If handler is nil, Handle panics. If a handler already exists for queryType, Handle panics.
func (*QueryTypeMux) QueryData ¶
func (mux *QueryTypeMux) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error)
QueryData dispatches the request to the handler(s) whose query type matches the request queries query type.
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