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flags.go
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flags.go
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/**
* Copyright 2018 Comcast Cable Communications Management, LLC
* 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 main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"strconv"
)
const (
// Command-line flags
cfConfig = "config"
cfVersion = "version"
cfLogLevel = "log-level"
cfInstanceID = "instance-id"
cfOrigin = "origin"
cfProxyPort = "proxy-port"
cfMetricsPort = "metrics-port"
cfProfilerPort = "profiler-port"
// Environment variables
evOrigin = "TRK_ORIGIN"
evProxyPort = "TRK_PROXY_PORT"
evMetricsPort = "TRK_METRICS_PORT"
evLogLevel = "TRK_LOG_LEVEL"
evProfilerPort = "TRK_PROFILER_PORT"
)
// loadConfiguration reads the config path from Flags,
// Loads the configs (w/ default values where missing)
// and then evaluates any provided flags as overrides
func loadConfiguration(c *Config, arguments []string) error {
var path string
var version bool
f := flag.NewFlagSet(applicationName, -1)
f.SetOutput(ioutil.Discard)
f.StringVar(&path, cfConfig, "", "Supplies Path to Config File")
f.BoolVar(&version, cfVersion, false, "Prints trickster version")
f.Parse(arguments)
// If the config file is not specified on the cmdline then try the default
// location to load the config file. If the default config does not exist
// then move on, no big deal.
if path != "" {
if err := c.LoadFile(path); err != nil {
return err
}
} else {
_, err := os.Open(c.Main.ConfigFile)
if err == nil {
if err := c.LoadFile(c.Main.ConfigFile); err != nil {
return err
}
}
}
// Display version information then exit the program
if version == true {
fmt.Println(applicationVersion)
os.Exit(3)
}
// Load from Environment Variables
loadEnvVars(c)
//Load from command line flags.
loadFlags(c, arguments)
return nil
}
func loadEnvVars(c *Config) {
// Origin
if x := os.Getenv(evOrigin); x != "" {
c.DefaultOriginURL = x
}
// Proxy Port
if x := os.Getenv(evProxyPort); x != "" {
if y, err := strconv.ParseInt(x, 10, 64); err == nil {
c.ProxyServer.ListenPort = int(y)
}
}
// Metrics Port
if x := os.Getenv(evMetricsPort); x != "" {
if y, err := strconv.ParseInt(x, 10, 64); err == nil {
c.Metrics.ListenPort = int(y)
}
}
// ProfilerPort
if x := os.Getenv(evProfilerPort); x != "" {
if y, err := strconv.ParseInt(x, 10, 64); err == nil {
c.Profiler.ListenPort = int(y)
c.Profiler.Enabled = true
}
}
// LogLevel
if x := os.Getenv(evLogLevel); x != "" {
c.Logging.LogLevel = x
}
}
// loadFlags loads configuration from command line flags.
func loadFlags(c *Config, arguments []string) {
var path string
var version bool
var origin string
var proxyListenPort int
var metricsListenPort int
var profilerListenPort int
f := flag.NewFlagSet(applicationName, flag.ExitOnError)
f.BoolVar(&version, cfVersion, true, "Prints Trickster version")
f.StringVar(&c.Logging.LogLevel, cfLogLevel, c.Logging.LogLevel, "Level of Logging to use (debug, info, warn, error)")
f.IntVar(&c.Main.InstanceID, cfInstanceID, 0, "Instance ID for when running multiple processes")
f.StringVar(&origin, cfOrigin, "", "URL to the Prometheus Origin. Enter it like you would in grafana, e.g., http://prometheus:9090")
f.IntVar(&proxyListenPort, cfProxyPort, 0, "Port that the Proxy server will listen on.")
f.IntVar(&metricsListenPort, cfMetricsPort, 0, "Port that the /metrics endpoint will listen on.")
f.IntVar(&profilerListenPort, cfProfilerPort, 0, "Port that the /debug/pprof endpoint will listen on.")
// BEGIN IGNORED FLAGS
f.StringVar(&path, cfConfig, "", "Path to Trickster Config File")
// END IGNORED FLAGS
f.Parse(arguments)
if len(origin) > 0 {
c.DefaultOriginURL = origin
}
if proxyListenPort > 0 {
c.ProxyServer.ListenPort = proxyListenPort
}
if metricsListenPort > 0 {
c.Metrics.ListenPort = metricsListenPort
}
if profilerListenPort > 0 {
c.Profiler.ListenPort = profilerListenPort
c.Profiler.Enabled = true
}
}