/
connection.go
169 lines (154 loc) · 4.73 KB
/
connection.go
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package s3
import (
"compress/gzip"
"fmt"
"io"
"path"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/cenkalti/backoff"
"github.com/danielstutzman/sync-log-files-to-db/src/log"
)
type S3Connection struct {
service *s3.S3
bucketName string
}
func NewS3Connection(opts *Options, configPath string) *S3Connection {
log.Infow("Creating AWS session...")
config := aws.Config{
Region: aws.String(opts.Region),
Endpoint: aws.String(opts.Endpoint),
S3ForcePathStyle: aws.Bool(true),
}
if opts.CredsPath != "" {
credsPath := path.Join(path.Dir(configPath), opts.CredsPath)
config.Credentials = credentials.NewSharedCredentials(credsPath, "")
}
session, err := session.NewSessionWithOptions(session.Options{
Config: config,
})
if err != nil {
panic(fmt.Errorf("Couldn't create AWS session: %s", err))
}
return &S3Connection{
service: s3.New(session),
bucketName: opts.BucketName,
}
}
func (conn *S3Connection) ListPaths(prefix string, maxKeys int64) []string {
var response *s3.ListObjectsOutput
var err error
err = backoff.Retry(func() error {
log.Infow("Listing S3 paths...",
"bucketName", conn.bucketName, "prefix", prefix, "maxKeys", maxKeys)
response, err = conn.service.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(conn.bucketName),
MaxKeys: aws.Int64(maxKeys),
Prefix: aws.String(prefix),
})
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from ListObjects", "bucket", conn.bucketName, "err", err)
} else if err2.StatusCode() == 500 || err2.StatusCode() == 503 {
// Let the backoff library retry
} else {
log.Fatalw("Error from ListObjects", "bucket", conn.bucketName, "err", err2)
}
}
return err
}, backoff.NewExponentialBackOff())
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from ListObjects", "bucket", conn.bucketName, "err", err)
} else {
log.Fatalw("Error from ListObjects", "bucket", conn.bucketName, "err", err2)
}
}
paths := []string{}
for _, object := range response.Contents {
paths = append(paths, *object.Key)
}
return paths
}
func (conn *S3Connection) DownloadPath(path string) io.ReadCloser {
var response *s3.GetObjectOutput
var err error
err = backoff.Retry(func() error {
log.Infow("Downloading...", "path", path)
response, err = conn.service.GetObject(&s3.GetObjectInput{
Bucket: aws.String(conn.bucketName),
Key: aws.String(path),
})
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from GetObject",
"bucket", conn.bucketName, "path", path, "err", err)
} else if err2.StatusCode() == 500 || err2.StatusCode() == 503 {
// Let the backoff library retry
} else {
log.Fatalw("Error from GetObject",
"bucket", conn.bucketName, "path", path, "err", err2)
}
}
return err
}, backoff.NewExponentialBackOff())
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from GetObject",
"bucket", conn.bucketName, "path", path, "err", err)
} else {
log.Fatalw("Error from GetObject",
"bucket", conn.bucketName, "path", path, "err", err2)
}
}
if strings.HasSuffix(path, ".gz") &&
*response.ContentType == "binary/octet-stream" {
reader, err := gzip.NewReader(response.Body)
if err != nil {
panic(fmt.Errorf("Error from gzip.NewReader: %s", err))
}
return reader
} else {
return response.Body
}
}
func (conn *S3Connection) DeletePath(path string) {
err := backoff.Retry(func() error {
log.Infow("Deleting...", "path", path)
_, err := conn.service.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(conn.bucketName),
Key: aws.String(path),
})
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from DeleteObject",
"bucket", conn.bucketName, "path", path, "err", err)
} else if err2.StatusCode() == 500 || err2.StatusCode() == 503 {
// Let the backoff library retry
} else {
log.Fatalw("Error from DeleteObject",
"bucket", conn.bucketName, "path", path, "err", err2)
}
}
return err
}, backoff.NewExponentialBackOff())
if err != nil {
err2, isRequestFailure := err.(awserr.RequestFailure)
if !isRequestFailure {
log.Fatalw("Error from DeleteObject",
"bucket", conn.bucketName, "path", path, "err", err)
} else {
log.Fatalw("Error from DeleteObject",
"bucket", conn.bucketName, "path", path, "err", err2)
}
}
}