Add support for graceful shutdown

Fixes #1014

Signed-off-by: Nicola Murino <[email protected]>

docs/full-configuration.md

@@ -31,6 +31,7 @@ The `serve` command supports the following flags:
 
 - `--config-dir` string. Location of the config dir. This directory is used as the base for files with a relative path, eg. the private keys for the SFTP server or the SQLite database if you use SQLite as data provider. The configuration file, if not explicitly set, is looked for in this dir. We support reading from JSON, TOML, YAML, HCL, envfile and Java properties config files. The default config file name is `sftpgo` and therefore `sftpgo.json`, `sftpgo.yaml` and so on are searched. The default value is the working directory (".") or the value of `SFTPGO_CONFIG_DIR` environment variable.
 - `--config-file` string. This flag explicitly defines the path, name and extension of the config file. If must be an absolute path or a path relative to the configuration directory. The specified file name must have a supported extension (JSON, YAML, TOML, HCL or Java properties). The default value is empty or the value of `SFTPGO_CONFIG_FILE` environment variable.
+- `--grace-time`, integer. Graceful shutdown is an option to initiate a shutdown without abrupt cancellation of the currently ongoing client-initiated transfer sessions. This grace time defines the number of seconds allowed for existing transfers to get completed before shutting down. 0 means disabled. The default value is `0` or the value of `SFTPGO_GRACE_TIME` environment variable. A graceful shutdown is triggered by an interrupt signal or by a service `stop` request on Windows, if a grace time is configured.
 - `--loaddata-from` string. Load users and folders from this file. The file must be specified as absolute path and it must contain a backup obtained using the `dumpdata` REST API or compatible content. The default value is empty or the value of `SFTPGO_LOADDATA_FROM` environment variable.
 - `--loaddata-clean` boolean. Determine if the loaddata-from file should be removed after a successful load. Default `false` or the value of `SFTPGO_LOADDATA_CLEAN` environment variable (1 or `true`, 0 or `false`).
 - `--loaddata-mode`, integer. Restore mode for data to load. 0 means new users are added, existing users are updated. 1 means new users are added, existing users are not modified. Default 1 or the value of `SFTPGO_LOADDATA_MODE` environment variable.

docs/portable-mode.md

@@ -74,6 +74,12 @@ Flags:
                                         virtual folder identified by this
                                         prefix and its contents
       --gcs-storage-class string
+      --grace-time int                  This grace time defines the number of
+                                        seconds allowed for existing transfers
+                                        to get completed before shutting down.
+                                        A graceful shutdown is triggered by an
+                                        interrupt signal.
+
   -h, --help                            help for portable
   -l, --log-file-path string            Leave empty to disable logging
       --log-level string                Set the log level.

docs/post-connect-hook.md

@@ -2,8 +2,6 @@
 
 This hook is executed as soon as a new connection is established. It notifies the connection's IP address and protocol. Based on the received response, the connection is accepted or rejected. Combining this hook with the [Post-login hook](./post-login-hook.md) you can implement your own (even for Protocol) blacklist/whitelist of IP addresses.
 
-Please keep in mind that you can easily configure specialized program such as [Fail2ban](http://www.fail2ban.org/) for brute force protection. Executing a hook for each connection can be heavy.
-
 The `post_connect_hook` can be defined as the absolute path of your program or an HTTP URL.
 
 If the hook defines an external program it can read the following environment variables:

go.mod

@@ -8,15 +8,15 @@ require (
 	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v0.5.1
 	github.com/GehirnInc/crypt v0.0.0-20200316065508-bb7000b8a962
 	github.com/alexedwards/argon2id v0.0.0-20211130144151-3585854a6387
-	github.com/aws/aws-sdk-go-v2 v1.16.16
-	github.com/aws/aws-sdk-go-v2/config v1.17.8
-	github.com/aws/aws-sdk-go-v2/credentials v1.12.21
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.17
-	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.35
-	github.com/aws/aws-sdk-go-v2/service/marketplacemetering v1.13.19
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.28.0
-	github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.16.2
-	github.com/aws/aws-sdk-go-v2/service/sts v1.16.19
+	github.com/aws/aws-sdk-go-v2 v1.17.0
+	github.com/aws/aws-sdk-go-v2/config v1.17.9
+	github.com/aws/aws-sdk-go-v2/credentials v1.12.22
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.18
+	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.36
+	github.com/aws/aws-sdk-go-v2/service/marketplacemetering v1.13.20
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.29.0
+	github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.16.3
+	github.com/aws/aws-sdk-go-v2/service/sts v1.17.0
 	github.com/cockroachdb/cockroach-go/v2 v2.2.16
 	github.com/coreos/go-oidc/v3 v3.4.0
 	github.com/eikenb/pipeat v0.0.0-20210730190139-06b3e6902001
@@ -82,16 +82,16 @@ require (
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.0.1 // indirect
 	github.com/ajg/form v1.5.1 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.8 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.23 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.17 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.24 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.14 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.24 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.18 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.25 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.15 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.18 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.17 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.17 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.11.23 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.13.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.19 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.11.24 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.13.7 // indirect
 	github.com/aws/smithy-go v1.13.3 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/boombuler/barcode v1.0.1 // indirect
@@ -156,7 +156,7 @@ require (
 	go.opencensus.io v0.23.0 // indirect
 	golang.org/x/mod v0.6.0 // indirect
 	golang.org/x/text v0.4.0 // indirect
-	golang.org/x/tools v0.1.12 // indirect
+	golang.org/x/tools v0.2.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20221018160656-63c7b68cfc55 // indirect

go.sum

@@ -224,67 +224,67 @@ github.com/aws/aws-sdk-go v1.44.45/go.mod h1:y4AeaBuwd2Lk+GepC1E9v0qOiTws0MIWAX4
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-github.com/aws/aws-sdk-go-v2 v1.16.16 h1:M1fj4FE2lB4NzRb9Y0xdWsn2P0+2UHVxwKyOa4YJNjk=
-github.com/aws/aws-sdk-go-v2 v1.16.16/go.mod h1:SwiyXi/1zTUZ6KIAmLK5V5ll8SiURNUYOqTerZPaF9k=
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@@ -2042,8 +2042,9 @@ golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyj
 golang.org/x/tools v0.1.9/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
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 golang.org/x/tools v0.1.11/go.mod h1:SgwaegtQh8clINPpECJMqnxLv9I09HLqnW3RMqW0CA4=
-golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.2.0 h1:G6AHpWxTMGY1KyEYoAQ5WTtIekUUvDNjan3ugu60JvE=
+golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=
 golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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internal/cmd/install_windows.go

@@ -109,5 +109,9 @@ func getCustomServeFlags() []string {
 	if logCompress != defaultLogCompress {
 		result = append(result, "--"+logCompressFlag+"=true")
 	}
+	if graceTime != defaultGraceTime {
+		result = append(result, "--"+graceTimeFlag)
+		result = append(result, strconv.Itoa(graceTime))
+	}
 	return result
 }