84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
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package diagnostic
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import (
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"context"
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"encoding/json"
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"net/http"
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"time"
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"github.com/rs/zerolog"
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)
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type Handler struct {
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log *zerolog.Logger
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timeout time.Duration
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systemCollector SystemCollector
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}
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func NewDiagnosticHandler(
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log *zerolog.Logger,
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timeout time.Duration,
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systemCollector SystemCollector,
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) *Handler {
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if timeout == 0 {
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timeout = defaultCollectorTimeout
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}
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return &Handler{
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log,
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timeout,
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systemCollector,
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}
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}
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func (handler *Handler) SystemHandler(writer http.ResponseWriter, request *http.Request) {
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logger := handler.log.With().Str(collectorField, systemCollectorName).Logger()
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logger.Info().Msg("Collection started")
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defer func() {
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logger.Info().Msg("Collection finished")
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}()
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ctx, cancel := context.WithTimeout(request.Context(), handler.timeout)
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defer cancel()
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info, rawInfo, err := handler.systemCollector.Collect(ctx)
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if err != nil {
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logger.Error().Err(err).Msg("error occurred whilst collecting system information")
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if rawInfo != "" {
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logger.Info().Msg("using raw information fallback")
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bytes := []byte(rawInfo)
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writeResponse(writer, bytes, &logger)
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} else {
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logger.Error().Msg("no raw information available")
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writer.WriteHeader(http.StatusInternalServerError)
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}
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return
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}
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if info == nil {
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logger.Error().Msgf("system information collection is nil")
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writer.WriteHeader(http.StatusInternalServerError)
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}
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encoder := json.NewEncoder(writer)
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err = encoder.Encode(info)
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if err != nil {
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logger.Error().Err(err).Msgf("error occurred whilst serializing information")
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writer.WriteHeader(http.StatusInternalServerError)
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}
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}
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func writeResponse(writer http.ResponseWriter, bytes []byte, logger *zerolog.Logger) {
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bytesWritten, err := writer.Write(bytes)
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if err != nil {
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logger.Error().Err(err).Msg("error occurred writing response")
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} else if bytesWritten != len(bytes) {
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logger.Error().Msgf("error incomplete write response %d/%d", bytesWritten, len(bytes))
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}
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}
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