/
diag.go
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/
diag.go
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// Copyright 2021 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package diag contains code to retrieve diagnostic information from
// the server.
package diag
import (
"context"
"os"
"strings"
"net/http"
"github.com/bobvawter/cacheroach/api/diag"
"github.com/google/wire"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/types/known/emptypb"
)
type contextKey int
var (
// RequestKey is a context key that should return an *http.Request.
RequestKey contextKey = 0
)
// Set is used by wire.
var Set = wire.NewSet(
wire.Struct(new(Diags)),
wire.Bind(new(diag.DiagsServer), new(*Diags)),
)
// Diags implements diag.DiagsServer.
type Diags struct {
diag.UnsafeDiagsServer
}
var _ diag.DiagsServer = (*Diags)(nil)
// Echo implements diag.DiagsServer.
func (d *Diags) Echo(ctx context.Context, _ *emptypb.Empty) (*diag.DiagResponse, error) {
resp := &diag.DiagResponse{
Environment: make(map[string]*diag.DiagResponse_Meta),
HttpHeaders: make(map[string]*diag.DiagResponse_Meta),
RpcMeta: make(map[string]*diag.DiagResponse_Meta),
}
if h, err := os.Hostname(); err != nil {
resp.Hostname = h
}
if md, ok := metadata.FromIncomingContext(ctx); ok {
for key, elts := range md {
resp.RpcMeta[key] = &diag.DiagResponse_Meta{Value: elts}
}
}
if req, ok := ctx.Value(RequestKey).(*http.Request); ok {
for key, elts := range req.Header {
resp.HttpHeaders[key] = &diag.DiagResponse_Meta{Value: elts}
}
}
for _, e := range os.Environ() {
parts := strings.Split(e, "=")
resp.Environment[parts[0]] = &diag.DiagResponse_Meta{Value: []string{parts[1]}}
}
return resp, nil
}