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// Copyright 2014 Google Inc. 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 contains the configuration file format for stenographer's main
// configuration file.
package config
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"github.com/google/stenographer/base"
)
var v = base.V // verbose logging
const (
defaultDiskSpacePercentage = 10
// By default, ext3 has issues with >32k files, so we go for something less
// than that.
defaultMaxDirectoryFiles = 30000
defaultMaxOpenFiles = 100000
)
// ThreadConfig is a json-decoded configuration for each stenotype thread,
// detailing where it should store data and how much disk space it should keep
// available on each disk.
type ThreadConfig struct {
PacketsDirectory string
IndexDirectory string
DiskFreePercentage int `json:",omitempty"`
MaxDirectoryFiles int `json:",omitempty"`
}
// Config is a json-decoded configuration for running stenographer.
type Config struct {
StenotypePath string
Threads []ThreadConfig
Interface string
Flags []string
Port int
Host string // Location to listen.
CertPath string // Directory where client and server certs are stored.
MaxOpenFiles int // Max number of file descriptors opened at once
}
// ReadConfigFile reads in the given JSON encoded configuration file and returns
// the Config object associated with the decoded configuration data.
func ReadConfigFile(filename string) (*Config, error) {
v(0, "Reading config %q", filename)
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("could not read config file %q: %v", filename, err)
}
dec := json.NewDecoder(bytes.NewReader(data))
var out Config
if err := dec.Decode(&out); err != nil {
return nil, fmt.Errorf("could not decode config file %q: %v", filename, err)
}
if out.MaxOpenFiles <= 0 {
out.MaxOpenFiles = defaultMaxOpenFiles
}
for i, thread := range out.Threads {
if thread.DiskFreePercentage <= 0 {
out.Threads[i].DiskFreePercentage = defaultDiskSpacePercentage
}
if thread.MaxDirectoryFiles <= 0 {
out.Threads[i].MaxDirectoryFiles = defaultMaxDirectoryFiles
}
}
return &out, nil
}
// Validate checks the configuration for common errors.
func (c Config) Validate() error {
for n, thread := range c.Threads {
if thread.PacketsDirectory == "" {
return fmt.Errorf("No packet directory specified for thread %d in configuration", n)
}
if thread.IndexDirectory == "" {
return fmt.Errorf("No index directory specified for thread %d in configuration", n)
}
}
if host := net.ParseIP(c.Host); host == nil {
return fmt.Errorf("invalid listening location %q in configuration", c.Host)
}
return nil
}
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