From 52930c5614d12a49ca8ac304b4aebfe32fc37183 Mon Sep 17 00:00:00 2001 From: Scott Miller Date: Tue, 4 May 2021 14:47:16 -0500 Subject: [PATCH] When running under systemd, send notifications about server startup, shutdown, and config reload (#11517) --- changelog/11517.txt | 3 + command/server.go | 22 ++ go.mod | 1 + go.sum | 16 +- vendor/github.com/coreos/go-systemd/LICENSE | 191 ++++++++++++++++++ vendor/github.com/coreos/go-systemd/NOTICE | 5 + .../coreos/go-systemd/daemon/sdnotify.go | 84 ++++++++ .../coreos/go-systemd/daemon/watchdog.go | 73 +++++++ vendor/modules.txt | 3 + 9 files changed, 384 insertions(+), 14 deletions(-) create mode 100644 changelog/11517.txt create mode 100644 vendor/github.com/coreos/go-systemd/LICENSE create mode 100644 vendor/github.com/coreos/go-systemd/NOTICE create mode 100644 vendor/github.com/coreos/go-systemd/daemon/sdnotify.go create mode 100644 vendor/github.com/coreos/go-systemd/daemon/watchdog.go diff --git a/changelog/11517.txt b/changelog/11517.txt new file mode 100644 index 000000000..f5cca7349 --- /dev/null +++ b/changelog/11517.txt @@ -0,0 +1,3 @@ +```release-note:improvement +core: Send notifications to systemd on start, stop, and configuration reload. +``` diff --git a/command/server.go b/command/server.go index da6a54f07..476c1f6fb 100644 --- a/command/server.go +++ b/command/server.go @@ -21,6 +21,7 @@ import ( "sync" "time" + systemd "github.com/coreos/go-systemd/daemon" "github.com/hashicorp/errwrap" "github.com/hashicorp/go-hclog" log "github.com/hashicorp/go-hclog" @@ -1894,6 +1895,9 @@ CLUSTER_SYNTHESIS_COMPLETE: return 1 } + // Notify systemd that the server is ready (if applicable) + c.notifySystemd(systemd.SdNotifyReady) + defer func() { if err := c.removePidFile(config.PidFile); err != nil { c.UI.Error(fmt.Sprintf("Error deleting the PID file: %s", err)) @@ -1921,6 +1925,9 @@ CLUSTER_SYNTHESIS_COMPLETE: case <-c.SighupCh: c.UI.Output("==> Vault reload triggered") + // Notify systemd that the server is reloading config + c.notifySystemd(systemd.SdNotifyReloading) + // Check for new log level var config *server.Config var level log.Level @@ -1976,6 +1983,8 @@ CLUSTER_SYNTHESIS_COMPLETE: pprof.Lookup("goroutine").WriteTo(logWriter, 2) } } + // Notify systemd that the server is shutting down + c.notifySystemd(systemd.SdNotifyStopping) // Stop the listeners so that we don't process further client requests. c.cleanupGuard.Do(listenerCloseFunc) @@ -1992,6 +2001,19 @@ CLUSTER_SYNTHESIS_COMPLETE: return retCode } +func (c *ServerCommand) notifySystemd(status string) { + sent, err := systemd.SdNotify(false, status) + if err != nil { + c.logger.Error("error notifying systemd", "error", err) + } else { + if sent { + c.logger.Debug("sent systemd notification", "notification", status) + } else { + c.logger.Debug("would have sent systemd notification (systemd not present)", "notification", status) + } + } +} + func (c *ServerCommand) enableDev(core *vault.Core, coreConfig *vault.CoreConfig) (*vault.InitResult, error) { ctx := namespace.ContextWithNamespace(context.Background(), namespace.RootNamespace) diff --git a/go.mod b/go.mod index 167fcbe9d..a4917f132 100644 --- a/go.mod +++ b/go.mod @@ -34,6 +34,7 @@ require ( github.com/cockroachdb/cockroach-go v0.0.0-20181001143604-e0a95dfd547c github.com/containerd/containerd v1.4.3 // indirect github.com/coreos/go-semver v0.2.0 + github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf github.com/denisenkom/go-mssqldb v0.0.0-20200428022330-06a60b6afbbc github.com/docker/docker v17.12.0-ce-rc1.0.20200309214505-aa6a9891b09c+incompatible github.com/docker/go-connections v0.4.0 diff --git a/go.sum b/go.sum index c03d20326..47e6b6954 100644 --- a/go.sum +++ b/go.sum @@ -165,7 +165,6 @@ github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmV github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg= github.com/armon/go-metrics v0.3.0/go.mod h1:zXjbSimjXTd7vOpY8B0/2LpvNvDoXBuplAD+gJD3GYs= github.com/armon/go-metrics v0.3.3/go.mod h1:4O98XIr/9W0sxpJ8UaYkvjk10Iff7SnFrb4QAOwNTFc= -github.com/armon/go-metrics v0.3.4 h1:Xqf+7f2Vhl9tsqDYmXhnXInUdcrtgpRNpIA15/uldSc= github.com/armon/go-metrics v0.3.4/go.mod h1:4O98XIr/9W0sxpJ8UaYkvjk10Iff7SnFrb4QAOwNTFc= github.com/armon/go-metrics v0.3.7 h1:c/oCtWzYpboy6+6f6LjXRlyW7NwA2SWf+a9KMlHq/bM= github.com/armon/go-metrics v0.3.7/go.mod h1:4O98XIr/9W0sxpJ8UaYkvjk10Iff7SnFrb4QAOwNTFc= @@ -265,8 +264,9 @@ github.com/coreos/go-oidc v2.2.1+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHo github.com/coreos/go-semver v0.2.0 h1:3Jm3tLmsgAYcjC+4Up7hJrFBPr+n7rAqYeSw/SZazuY= github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk= github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= -github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e h1:Wf6HqHfScWJN9/ZjdUKyjop4mf3Qdd+1TvvltAvM3m8= github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= +github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf h1:iW4rZ826su+pqaw19uhpSCzhj44qo35pNgKFGqzDKkU= +github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= github.com/coreos/go-systemd/v22 v22.0.0 h1:XJIw/+VlJ+87J+doOxznsAWIdmWuViOVhkQamW5YV28= github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk= github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA= @@ -336,7 +336,6 @@ github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7 github.com/evanphx/json-patch v0.0.0-20190203023257-5858425f7550/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk= github.com/evanphx/json-patch v4.2.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk= github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4= -github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s= github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU= github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg= github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM= @@ -588,7 +587,6 @@ github.com/hashicorp/go-hclog v0.9.1/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrj github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ= github.com/hashicorp/go-hclog v0.12.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ= github.com/hashicorp/go-hclog v0.14.1/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ= -github.com/hashicorp/go-hclog v0.15.0 h1:qMuK0wxsoW4D0ddCCYwPSTm4KQv1X1ke3WmPWZ0Mvsk= github.com/hashicorp/go-hclog v0.15.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ= github.com/hashicorp/go-hclog v0.16.0 h1:uCeOEwSWGMwhJUdpUjk+1cVKIEfGu2/1nFXukimi2MU= github.com/hashicorp/go-hclog v0.16.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ= @@ -603,7 +601,6 @@ github.com/hashicorp/go-kms-wrapping/entropy v0.1.0/go.mod h1:d1g9WGtAunDNpek8jU github.com/hashicorp/go-memdb v1.0.2 h1:AIjzJlwIxz2inhZqRJZfe6D15lPeF0/cZyS1BVlnlHg= github.com/hashicorp/go-memdb v1.0.2/go.mod h1:I6dKdmYhZqU0RJSheVEWgTNWdVQH5QvTgIUQ0t/t32M= github.com/hashicorp/go-msgpack v0.5.3/go.mod h1:ahLV/dePpqEmjfWmKiqvPkv/twdG7iPBM1vqhUKIvfM= -github.com/hashicorp/go-msgpack v0.5.5 h1:i9R9JSrqIz0QVLz3sz+i3YJdT7TTSLcfLLzJi9aZTuI= github.com/hashicorp/go-msgpack v0.5.5/go.mod h1:ahLV/dePpqEmjfWmKiqvPkv/twdG7iPBM1vqhUKIvfM= github.com/hashicorp/go-msgpack v1.1.5 h1:9byZdVjKTe5mce63pRVNP1L7UAmdHOTEMGehn6KvJWs= github.com/hashicorp/go-msgpack v1.1.5/go.mod h1:gWVc3sv/wbDmR3rQsj1CAktEZzoz1YNK9NfGLXJ69/4= @@ -662,12 +659,9 @@ github.com/hashicorp/nomad/api v0.0.0-20191220223628-edc62acd919d/go.mod h1:WKCL github.com/hashicorp/raft v1.0.1/go.mod h1:DVSAWItjLjTOkVbSpWQ0j0kUADIvDaCtBxIcbNAQLkI= github.com/hashicorp/raft v1.1.0/go.mod h1:4Ak7FSPnuvmb0GV6vgIAJ4vYT4bek9bb6Q+7HVbyzqM= github.com/hashicorp/raft v1.1.2-0.20191002163536-9c6bd3e3eb17/go.mod h1:vPAJM8Asw6u8LxC3eJCUZmRP/E4QmUGE1R7g7k8sG/8= -github.com/hashicorp/raft v1.2.0 h1:mHzHIrF0S91d3A7RPBvuqkgB4d/7oFJZyvf1Q4m7GA0= github.com/hashicorp/raft v1.2.0/go.mod h1:vPAJM8Asw6u8LxC3eJCUZmRP/E4QmUGE1R7g7k8sG/8= github.com/hashicorp/raft v1.3.0 h1:Wox4J4R7J2FOJLtTa6hdk0VJfiNUSP32pYoYR738bkE= github.com/hashicorp/raft v1.3.0/go.mod h1:4Ak7FSPnuvmb0GV6vgIAJ4vYT4bek9bb6Q+7HVbyzqM= -github.com/hashicorp/raft-autopilot v0.1.2 h1:yeqdUjWLjVJkBM+mcVxqwxi+w+aHsb9cEON2dz69OCs= -github.com/hashicorp/raft-autopilot v0.1.2/go.mod h1:Af4jZBwaNOI+tXfIqIdbcAnh/UyyqIMj/pOISIfhArw= github.com/hashicorp/raft-autopilot v0.1.3 h1:Y+5jWKTFABJhCrpVwGpGjti2LzwQSzivoqd2wM6JWGw= github.com/hashicorp/raft-autopilot v0.1.3/go.mod h1:Af4jZBwaNOI+tXfIqIdbcAnh/UyyqIMj/pOISIfhArw= github.com/hashicorp/raft-boltdb v0.0.0-20171010151810-6e5ba93211ea h1:xykPFhrBAS2J0VBzVa5e80b5ZtYuNQtgXjN40qBZlD4= @@ -846,7 +840,6 @@ github.com/martini-contrib/render v0.0.0-20150707142108-ec18f8345a11/go.mod h1:A github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU= github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE= github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc= -github.com/mattn/go-colorable v0.1.7 h1:bQGKb3vps/j0E9GfJQ03JyhRuxsvdAanXlT9BTw3mdw= github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc= github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8= github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc= @@ -1382,7 +1375,6 @@ golang.org/x/sync v0.0.0-20190412183630-56d357773e84/go.mod h1:RxMgew5VJxzue5/jJ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= -golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 h1:SQFwaSi55rU7vdNs9Yr0Z324VNlrF+0wMqRXT4St8ck= golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ= golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= @@ -1450,10 +1442,6 @@ golang.org/x/sys v0.0.0-20200828194041-157a740278f4/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk= -golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c= -golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210426230700-d19ff857e887 h1:dXfMednGJh/SUUFjTLsWJz3P+TQt9qnR11GgeI3vWKs= golang.org/x/sys v0.0.0-20210426230700-d19ff857e887/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/term v0.0.0-20201117132131-f5c789dd3221 h1:/ZHdbVpdR/jk3g30/d4yUL0JU9kksj8+F/bnQUVLGDM= diff --git a/vendor/github.com/coreos/go-systemd/LICENSE b/vendor/github.com/coreos/go-systemd/LICENSE new file mode 100644 index 000000000..37ec93a14 --- /dev/null +++ b/vendor/github.com/coreos/go-systemd/LICENSE @@ -0,0 +1,191 @@ +Apache License +Version 2.0, January 2004 +http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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However, +in accepting such obligations, You may act only on Your own behalf and on Your +sole responsibility, not on behalf of any other Contributor, and only if You +agree to indemnify, defend, and hold each Contributor harmless for any liability +incurred by, or claims asserted against, such Contributor by reason of your +accepting any such warranty or additional liability. + +END OF TERMS AND CONDITIONS + +APPENDIX: How to apply the Apache License to your work + +To apply the Apache License to your work, attach the following boilerplate +notice, with the fields enclosed by brackets "[]" replaced with your own +identifying information. (Don't include the brackets!) The text should be +enclosed in the appropriate comment syntax for the file format. We also +recommend that a file or class name and description of purpose be included on +the same "printed page" as the copyright notice for easier identification within +third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/vendor/github.com/coreos/go-systemd/NOTICE b/vendor/github.com/coreos/go-systemd/NOTICE new file mode 100644 index 000000000..23a0ada2f --- /dev/null +++ b/vendor/github.com/coreos/go-systemd/NOTICE @@ -0,0 +1,5 @@ +CoreOS Project +Copyright 2018 CoreOS, Inc + +This product includes software developed at CoreOS, Inc. +(http://www.coreos.com/). diff --git a/vendor/github.com/coreos/go-systemd/daemon/sdnotify.go b/vendor/github.com/coreos/go-systemd/daemon/sdnotify.go new file mode 100644 index 000000000..ba4ae31f1 --- /dev/null +++ b/vendor/github.com/coreos/go-systemd/daemon/sdnotify.go @@ -0,0 +1,84 @@ +// Copyright 2014 Docker, Inc. +// Copyright 2015-2018 CoreOS, Inc. +// +// 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 daemon provides a Go implementation of the sd_notify protocol. +// It can be used to inform systemd of service start-up completion, watchdog +// events, and other status changes. +// +// https://www.freedesktop.org/software/systemd/man/sd_notify.html#Description +package daemon + +import ( + "net" + "os" +) + +const ( + // SdNotifyReady tells the service manager that service startup is finished + // or the service finished loading its configuration. + SdNotifyReady = "READY=1" + + // SdNotifyStopping tells the service manager that the service is beginning + // its shutdown. + SdNotifyStopping = "STOPPING=1" + + // SdNotifyReloading tells the service manager that this service is + // reloading its configuration. Note that you must call SdNotifyReady when + // it completed reloading. + SdNotifyReloading = "RELOADING=1" + + // SdNotifyWatchdog tells the service manager to update the watchdog + // timestamp for the service. + SdNotifyWatchdog = "WATCHDOG=1" +) + +// SdNotify sends a message to the init daemon. It is common to ignore the error. +// If `unsetEnvironment` is true, the environment variable `NOTIFY_SOCKET` +// will be unconditionally unset. +// +// It returns one of the following: +// (false, nil) - notification not supported (i.e. NOTIFY_SOCKET is unset) +// (false, err) - notification supported, but failure happened (e.g. error connecting to NOTIFY_SOCKET or while sending data) +// (true, nil) - notification supported, data has been sent +func SdNotify(unsetEnvironment bool, state string) (bool, error) { + socketAddr := &net.UnixAddr{ + Name: os.Getenv("NOTIFY_SOCKET"), + Net: "unixgram", + } + + // NOTIFY_SOCKET not set + if socketAddr.Name == "" { + return false, nil + } + + if unsetEnvironment { + if err := os.Unsetenv("NOTIFY_SOCKET"); err != nil { + return false, err + } + } + + conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr) + // Error connecting to NOTIFY_SOCKET + if err != nil { + return false, err + } + defer conn.Close() + + if _, err = conn.Write([]byte(state)); err != nil { + return false, err + } + return true, nil +} diff --git a/vendor/github.com/coreos/go-systemd/daemon/watchdog.go b/vendor/github.com/coreos/go-systemd/daemon/watchdog.go new file mode 100644 index 000000000..7a0e0d3a5 --- /dev/null +++ b/vendor/github.com/coreos/go-systemd/daemon/watchdog.go @@ -0,0 +1,73 @@ +// Copyright 2016 CoreOS, Inc. +// +// 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 daemon + +import ( + "fmt" + "os" + "strconv" + "time" +) + +// SdWatchdogEnabled returns watchdog information for a service. +// Processes should call daemon.SdNotify(false, daemon.SdNotifyWatchdog) every +// time / 2. +// If `unsetEnvironment` is true, the environment variables `WATCHDOG_USEC` and +// `WATCHDOG_PID` will be unconditionally unset. +// +// It returns one of the following: +// (0, nil) - watchdog isn't enabled or we aren't the watched PID. +// (0, err) - an error happened (e.g. error converting time). +// (time, nil) - watchdog is enabled and we can send ping. +// time is delay before inactive service will be killed. +func SdWatchdogEnabled(unsetEnvironment bool) (time.Duration, error) { + wusec := os.Getenv("WATCHDOG_USEC") + wpid := os.Getenv("WATCHDOG_PID") + if unsetEnvironment { + wusecErr := os.Unsetenv("WATCHDOG_USEC") + wpidErr := os.Unsetenv("WATCHDOG_PID") + if wusecErr != nil { + return 0, wusecErr + } + if wpidErr != nil { + return 0, wpidErr + } + } + + if wusec == "" { + return 0, nil + } + s, err := strconv.Atoi(wusec) + if err != nil { + return 0, fmt.Errorf("error converting WATCHDOG_USEC: %s", err) + } + if s <= 0 { + return 0, fmt.Errorf("error WATCHDOG_USEC must be a positive number") + } + interval := time.Duration(s) * time.Microsecond + + if wpid == "" { + return interval, nil + } + p, err := strconv.Atoi(wpid) + if err != nil { + return 0, fmt.Errorf("error converting WATCHDOG_PID: %s", err) + } + if os.Getpid() != p { + return 0, nil + } + + return interval, nil +} diff --git a/vendor/modules.txt b/vendor/modules.txt index 3c20e9390..04313eaa1 100644 --- a/vendor/modules.txt +++ b/vendor/modules.txt @@ -278,6 +278,9 @@ github.com/coreos/go-oidc # github.com/coreos/go-semver v0.2.0 ## explicit github.com/coreos/go-semver/semver +# github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf +## explicit +github.com/coreos/go-systemd/daemon # github.com/coreos/go-systemd/v22 v22.0.0 github.com/coreos/go-systemd/v22/journal # github.com/couchbase/gocb/v2 v2.1.4