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config.go
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/
config.go
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// Copyright 2014 The Cayley Authors. All rights reserved.
//
// 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 config
import (
"encoding/json"
"fmt"
"os"
"strconv"
"time"
)
// Config defines the behavior of cayley database instances.
type Config struct {
DatabaseType string
DatabasePath string
DatabaseOptions map[string]interface{}
ReplicationType string
ReplicationOptions map[string]interface{}
ListenHost string
ListenPort string
ReadOnly bool
Timeout time.Duration
LoadSize int
RequiresHTTPRequestContext bool
}
type config struct {
DatabaseType string `json:"database"`
DatabasePath string `json:"db_path"`
DatabaseOptions map[string]interface{} `json:"db_options"`
ReplicationType string `json:"replication"`
ReplicationOptions map[string]interface{} `json:"replication_options"`
ListenHost string `json:"listen_host"`
ListenPort string `json:"listen_port"`
ReadOnly bool `json:"read_only"`
Timeout duration `json:"timeout"`
LoadSize int `json:"load_size"`
RequiresHTTPRequestContext bool `json:"http_request_context"`
}
func (c *Config) UnmarshalJSON(data []byte) error {
var t config
err := json.Unmarshal(data, &t)
if err != nil {
return err
}
*c = Config{
DatabaseType: t.DatabaseType,
DatabasePath: t.DatabasePath,
DatabaseOptions: t.DatabaseOptions,
ReplicationType: t.ReplicationType,
ReplicationOptions: t.ReplicationOptions,
ListenHost: t.ListenHost,
ListenPort: t.ListenPort,
ReadOnly: t.ReadOnly,
Timeout: time.Duration(t.Timeout),
LoadSize: t.LoadSize,
RequiresHTTPRequestContext: t.RequiresHTTPRequestContext,
}
return nil
}
func (c *Config) MarshalJSON() ([]byte, error) {
return json.Marshal(config{
DatabaseType: c.DatabaseType,
DatabasePath: c.DatabasePath,
DatabaseOptions: c.DatabaseOptions,
ReplicationType: c.ReplicationType,
ReplicationOptions: c.ReplicationOptions,
ListenHost: c.ListenHost,
ListenPort: c.ListenPort,
ReadOnly: c.ReadOnly,
Timeout: duration(c.Timeout),
LoadSize: c.LoadSize,
})
}
// duration is a time.Duration that satisfies the
// json.UnMarshaler and json.Marshaler interfaces.
type duration time.Duration
// UnmarshalJSON unmarshals a duration according to the following scheme:
// * If the element is absent the duration is zero.
// * If the element is parsable as a time.Duration, the parsed value is kept.
// * If the element is parsable as a number, that number of seconds is kept.
func (d *duration) UnmarshalJSON(data []byte) error {
if len(data) == 0 {
*d = 0
return nil
}
text := string(data)
t, err := time.ParseDuration(text)
if err == nil {
*d = duration(t)
return nil
}
i, err := strconv.ParseInt(text, 10, 64)
if err == nil {
*d = duration(time.Duration(i) * time.Second)
return nil
}
// This hack is to get around strconv.ParseFloat
// not handling e-notation for integers.
f, err := strconv.ParseFloat(text, 64)
*d = duration(time.Duration(f) * time.Second)
return err
}
func (d *duration) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf("%q", *d)), nil
}
// Load reads a JSON-encoded config contained in the given file. A zero value
// config is returned if the filename is empty.
func Load(file string) (*Config, error) {
config := &Config{}
if file == "" {
return config, nil
}
f, err := os.Open(file)
if err != nil {
return nil, fmt.Errorf("could not open config file %q: %v", file, err)
}
defer f.Close()
dec := json.NewDecoder(f)
err = dec.Decode(config)
if err != nil {
return nil, fmt.Errorf("could not parse config file %q: %v", file, err)
}
return config, nil
}