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flow_http.go
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flow_http.go
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package flow
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"github.com/grafana/agent/pkg/river/encoding"
"github.com/gorilla/mux"
"github.com/grafana/agent/pkg/flow/internal/controller"
)
// ComponentHandler returns an http.HandlerFunc which will delegate all requests to
// a component named by the first path segment
func (f *Flow) ComponentHandler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id := vars["id"]
// find node with ID
var node *controller.ComponentNode
for _, n := range f.loader.Components() {
if n.ID().String() == id {
node = n
break
}
}
if node == nil {
w.WriteHeader(http.StatusNotFound)
return
}
// TODO: potentially cache these handlers, and invalidate on component state change.
handler := node.HTTPHandler()
if handler == nil {
w.WriteHeader(http.StatusNotFound)
return
}
// remove /component/{id} from front of path, so each component can handle paths from their own root path
r.URL.Path = strings.TrimPrefix(r.URL.Path, "/component/"+id)
handler.ServeHTTP(w, r)
}
}
// ComponentJSON returns the json representation of the flow component.
func (f *Flow) ComponentJSON(w io.Writer, ci *ComponentInfo) error {
f.loadMut.RLock()
defer f.loadMut.RUnlock()
var foundComponent *controller.ComponentNode
for _, c := range f.loader.Components() {
if c.ID().String() == ci.ID {
foundComponent = c
break
}
}
if foundComponent == nil {
return fmt.Errorf("unable to find component named %q", ci.ID)
}
var err error
args, err := encoding.ConvertRiverBodyToJSON(foundComponent.Arguments())
if err != nil {
return err
}
ci.Arguments = args
exports, err := encoding.ConvertRiverBodyToJSON(foundComponent.Exports())
if err != nil {
return err
}
ci.Exports = exports
debugInfo, err := encoding.ConvertRiverBodyToJSON(foundComponent.DebugInfo())
if err != nil {
return err
}
ci.DebugInfo = debugInfo
bb, err := json.Marshal(ci)
if err != nil {
return err
}
_, err = w.Write(bb)
return err
}