forked from cockroachdb/cockroach
/
config.go
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/
config.go
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// Copyright 2014 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. See the AUTHORS file
// for names of contributors.
//
// Author: Bram Gruneir (bram+code@cockroachlabs.com)
package server
import (
"bytes"
"net/http"
"net/url"
"github.com/cockroachdb/cockroach/client"
"github.com/cockroachdb/cockroach/keys"
"github.com/cockroachdb/cockroach/proto"
"github.com/cockroachdb/cockroach/util"
"github.com/cockroachdb/cockroach/util/log"
gogoproto "github.com/gogo/protobuf/proto"
)
// putConfig writes a config for the specified key prefix (which is
// treated as a key). The config is parsed from the input "body". The
// config is stored proto-encoded. The specified body must validly
// parse into a config struct and must pass a given validation check (if
// validate is not nil).
func putConfig(db *client.DB, configPrefix proto.Key, config gogoproto.Message,
path string, body []byte, r *http.Request,
validate func(gogoproto.Message) error) error {
if len(path) == 0 {
return util.Errorf("no path specified for Put")
}
if err := util.UnmarshalRequest(r, body, config, util.AllEncodings); err != nil {
return util.Errorf("config has invalid format: %+v: %s", config, err)
}
if validate != nil {
if err := validate(config); err != nil {
return err
}
}
key := keys.MakeKey(configPrefix, proto.Key(path[1:]))
return db.Put(key, config)
}
// getConfig retrieves the configuration for the specified key. If the
// key is empty, all configurations are returned. Otherwise, the
// leading "/" path delimiter is stripped and the configuration
// matching the remainder is retrieved. Note that this will retrieve
// the default config if "key" is equal to "/", and will list all
// configs if "key" is equal to "". The body result contains a listing
// of keys and retrieval of a config. The output format is determined
// by the request header.
func getConfig(db *client.DB, configPrefix proto.Key, config gogoproto.Message,
path string, r *http.Request) (body []byte, contentType string, err error) {
// Scan all configs if the key is empty.
if len(path) == 0 {
var rows []client.KeyValue
if rows, err = db.Scan(configPrefix, configPrefix.PrefixEnd(), maxGetResults); err != nil {
return
}
if len(rows) == maxGetResults {
log.Warningf("retrieved maximum number of results (%d); some may be missing", maxGetResults)
}
var prefixes []string
for _, row := range rows {
trimmed := bytes.TrimPrefix(row.Key, configPrefix)
prefixes = append(prefixes, url.QueryEscape(string(trimmed)))
}
// Encode the response.
body, contentType, err = util.MarshalResponse(r, prefixes, util.AllEncodings)
} else {
configkey := keys.MakeKey(configPrefix, proto.Key(path[1:]))
if err = db.GetProto(configkey, config); err != nil {
return
}
body, contentType, err = util.MarshalResponse(r, config, util.AllEncodings)
}
return
}
// deleteConfig removes the config specified by key.
func deleteConfig(db *client.DB, configPrefix proto.Key, path string, r *http.Request) error {
if len(path) == 0 {
return util.Errorf("no path specified for config Delete")
}
if path == "/" {
return util.Errorf("the default configuration cannot be deleted")
}
configKey := keys.MakeKey(configPrefix, proto.Key(path[1:]))
return db.Del(configKey)
}