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main.go
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main.go
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// MIT License
//
// (C) Copyright [2020-2021] Hewlett Packard Enterprise Development LP
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
package main
import (
"crypto/tls"
"fmt"
"io"
"net/http"
"os"
"path"
"time"
hms_s3 "github.com/Cray-HPE/hms-s3"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/namsral/flag"
"go.uber.org/zap"
)
const SLS_FILE = "sls_input_file.json"
var (
outputDir = flag.String("output_dir", "/sls", "Destination directory to put files.")
maxPingBucketAttempts = flag.Int("max_ping_bucket_attempts", 30, "Number of attempts to ping the S3 bucket")
logger *zap.Logger
s3Client *hms_s3.S3Client
)
func writeOutputFile(file string) {
var err error
var objectOutput *s3.GetObjectOutput
// We really need these files, try forever to get them.
for true {
objectOutput, err = s3Client.GetObject(file)
if err != nil {
logger.Error("Failed to get file from S3!",
zap.String("file", file),
zap.Error(err),
)
time.Sleep(time.Second * 3)
} else {
break
}
}
fullPath := path.Join(*outputDir, file)
outFile, err := os.Create(fullPath)
if err != nil {
logger.Fatal("Failed to create output file!", zap.Error(err))
}
defer outFile.Close()
_, err = io.Copy(outFile, objectOutput.Body)
if err != nil {
logger.Fatal("Failed to write to output file!", zap.Error(err))
}
logger.Info("Downloaded file.", zap.String("fullPath", fullPath))
}
func main() {
// Parse the arguments.
flag.Parse()
// Setup logging.
var err error
logger, err = zap.NewProduction()
if err != nil {
panic(fmt.Sprintf("Can't initialize Zap logger: %v", err))
}
defer logger.Sync()
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
httpClient := &http.Client{Transport: tr}
logger.Info("Beginning downloading SLS input files S3.")
s3Connection, err := hms_s3.LoadConnectionInfoFromEnvVars()
if err != nil {
logger.Fatal("Failed to load connection info for S3!", zap.Error(err))
}
s3Client, err = hms_s3.NewS3Client(s3Connection, httpClient)
if err != nil {
// An error here is uncorrectable.
logger.Fatal("Failed to setup new S3 client!", zap.Error(err))
}
connected := false
for attempt := 0; attempt < *maxPingBucketAttempts; attempt++ {
err = s3Client.PingBucket()
if err != nil {
logger.Warn("Failed to ping bucket. Sleeping 1 second",
zap.Int("attempt", attempt), zap.Int("maxAttempts", *maxPingBucketAttempts), zap.Error(err))
time.Sleep(time.Second)
} else {
logger.Info("Connected to S3 bucket.", zap.String("bucket", s3Client.ConnInfo.Bucket))
connected = true
break
}
}
if !connected {
logger.Fatal("Exhausted attempts to ping bucket")
}
// Now pull down the one file we need.
writeOutputFile(SLS_FILE)
}