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|
package config
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/mimecast/dtail/internal/source"
)
// Used to initialize the configuration.
type initializer struct {
Common *CommonConfig
Server *ServerConfig
Client *ClientConfig
}
type transformCb func(*initializer, *Args, []string) error
func (in *initializer) parseConfig(args *Args) error {
if strings.ToLower(args.ConfigFile) == "none" {
return nil
}
if args.ConfigFile != "" {
return in.parseSpecificConfig(args.ConfigFile)
}
if homeDir, err := os.UserHomeDir(); err != nil {
var paths []string
paths = append(paths, fmt.Sprintf("%s/.config/dtail/dtail.conf", homeDir))
paths = append(paths, fmt.Sprintf("%s/.dtail.conf", homeDir))
for _, configPath := range paths {
if _, err := os.Stat(configPath); !os.IsNotExist(err) {
in.parseSpecificConfig(configPath)
}
}
}
return nil
}
func (in *initializer) parseSpecificConfig(configFile string) error {
fd, err := os.Open(configFile)
if err != nil {
return fmt.Errorf("Unable to read config file: %v", err)
}
defer fd.Close()
cfgBytes, err := ioutil.ReadAll(fd)
if err != nil {
return fmt.Errorf("Unable to read config file %s: %v", configFile, err)
}
if err := json.Unmarshal([]byte(cfgBytes), in); err != nil {
return fmt.Errorf("Unable to parse config file %s: %v", configFile, err)
}
return nil
}
func (in *initializer) transformConfig(sourceProcess source.Source, args *Args,
additionalArgs []string) error {
in.processEnvVars(args)
switch sourceProcess {
case source.Server:
return in.setupConfig(transformServer, args, additionalArgs)
case source.Client:
return in.setupConfig(transformClient, args, additionalArgs)
case source.HealthCheck:
return in.setupConfig(transformHealthCheck, args, additionalArgs)
default:
return fmt.Errorf("Unable to transform config, unknown source '%s'",
sourceProcess)
}
}
func (in *initializer) processEnvVars(args *Args) {
if Env("DTAIL_INTEGRATION_TEST_RUN_MODE") {
os.Setenv("DTAIL_HOSTNAME_OVERRIDE", "integrationtest")
in.Server.MaxLineLength = 1024
}
sshPrivateKeyPathFile := os.Getenv("DTAIL_SSH_PRIVATE_KEYFILE_PATH")
if len(sshPrivateKeyPathFile) > 0 && args.SSHPrivateKeyFilePath == "" {
args.SSHPrivateKeyFilePath = sshPrivateKeyPathFile
}
}
func (in *initializer) setupConfig(sourceCb transformCb, args *Args,
additionalArgs []string) error {
// Copy args to config objects.
// NEXT: Maybe unify args and config structs?
if args.SSHPort != DefaultSSHPort {
in.Common.SSHPort = args.SSHPort
}
if args.LogLevel != DefaultLogLevel {
in.Common.LogLevel = args.LogLevel
}
if args.NoColor {
in.Client.TermColorsEnable = false
}
if args.LogDir != "" {
in.Common.LogDir = args.LogDir
}
if args.Logger != "" {
in.Common.Logger = args.Logger
}
if args.ConnectionsPerCPU == 0 {
args.ConnectionsPerCPU = DefaultConnectionsPerCPU
}
setupLogDirectory(in)
sourceCb(in, args, additionalArgs)
if args.Plain {
setupPlainMode(in, args)
}
if args.What == "" {
setupAdditionalArgs(in, args)
}
return nil
}
func setupLogDirectory(in *initializer) {
// Setup log directory.
if strings.Contains(in.Common.LogDir, "~/") {
homeDir, err := os.UserHomeDir()
if err != nil {
panic(err)
}
in.Common.LogDir = strings.ReplaceAll(in.Common.LogDir, "~/",
fmt.Sprintf("%s/", homeDir))
}
}
func setupPlainMode(in *initializer, args *Args) {
args.Quiet = true
args.NoColor = true
in.Client.TermColorsEnable = false
if args.LogLevel == "" {
args.LogLevel = "ERROR"
in.Common.LogLevel = "ERROR"
}
}
func setupAdditionalArgs(in *initializer, args *Args) {
// Interpret additional args as file list or as query.
if args.What == "" {
var files []string
for _, arg := range flag.Args() {
if args.QueryStr == "" && strings.Contains(strings.ToLower(arg), "select ") {
args.QueryStr = arg
continue
}
files = append(files, arg)
}
args.What = strings.Join(files, ",")
}
}
func transformClient(in *initializer, args *Args, additionalArgs []string) error {
// Serverless mode.
if args.Discovery == "" && (args.ServersStr == "" ||
strings.ToLower(args.ServersStr) == "serverless") {
// We are not connecting to any servers.
args.Serverless = true
if args.LogLevel == DefaultLogLevel {
in.Common.LogLevel = "warn"
}
}
return nil
}
func transformServer(in *initializer, args *Args, additionalArgs []string) error {
if args.SSHBindAddress != "" {
in.Server.SSHBindAddress = args.SSHBindAddress
}
return nil
}
func transformHealthCheck(in *initializer, args *Args, additionalArgs []string) error {
// Serverless mode.
if args.Discovery == "" && (args.ServersStr == "" ||
strings.ToLower(args.ServersStr) == "serverless") {
// We are not connecting to any servers.
args.Serverless = true
in.Common.LogLevel = "warn"
}
args.TrustAllHosts = true
return nil
}
|
