From 7715fcf37342248e7c86e7bf81b88ce067a10c09 Mon Sep 17 00:00:00 2001 From: ston1th Date: Sun, 22 Nov 2020 12:59:12 +0100 Subject: [PATCH] initial commit --- .gitignore | 2 + LICENSE | 674 +++++++++++++++++++++++++++++++++++ Makefile | 55 +++ TODO | 7 + VERSION | 1 + cmd/vipman/main.go | 72 ++++ config.tpl | 30 ++ etcd.sh | 12 + go.mod | 29 ++ go.sum | 210 +++++++++++ pkg/api/api.go | 7 + pkg/api/v1/schema/schema.go | 34 ++ pkg/api/v1/server/context.go | 103 ++++++ pkg/api/v1/server/handler.go | 24 ++ pkg/api/v1/server/routes.go | 21 ++ pkg/api/v1/server/server.go | 92 +++++ pkg/cluster/cluster.go | 33 ++ pkg/config/ca.go | 19 + pkg/config/config.go | 159 +++++++++ pkg/controller/vip.go | 91 +++++ pkg/etcd/cluster.go | 82 +++++ pkg/etcd/etcd.go | 223 ++++++++++++ pkg/haproxy/haproxy.go | 67 ++++ pkg/haproxy/systemd.go | 20 ++ pkg/haproxy/template.go | 43 +++ pkg/raft/cluster.go | 56 +++ pkg/raft/fsm.go | 99 +++++ pkg/raft/kv.go | 56 +++ pkg/raft/raft.go | 202 +++++++++++ pkg/raft/tls/stream.go | 63 ++++ pkg/util/crash.go | 41 +++ pkg/vip/arp.go | 10 + pkg/vip/arp_linux.go.bak | 173 +++++++++ pkg/vip/arp_linux2.go | 38 ++ pkg/vip/vip.go | 96 +++++ run_etcd.sh | 6 + run_raft.sh | 7 + 37 files changed, 2957 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 TODO create mode 100644 VERSION create mode 100644 cmd/vipman/main.go create mode 100644 config.tpl create mode 100755 etcd.sh create mode 100644 go.mod create mode 100644 go.sum create mode 100644 pkg/api/api.go create mode 100644 pkg/api/v1/schema/schema.go create mode 100644 pkg/api/v1/server/context.go create mode 100644 pkg/api/v1/server/handler.go create mode 100644 pkg/api/v1/server/routes.go create mode 100644 pkg/api/v1/server/server.go create mode 100644 pkg/cluster/cluster.go create mode 100644 pkg/config/ca.go create mode 100644 pkg/config/config.go create mode 100644 pkg/controller/vip.go create mode 100644 pkg/etcd/cluster.go create mode 100644 pkg/etcd/etcd.go create mode 100644 pkg/haproxy/haproxy.go create mode 100644 pkg/haproxy/systemd.go create mode 100644 pkg/haproxy/template.go create mode 100644 pkg/raft/cluster.go create mode 100644 pkg/raft/fsm.go create mode 100644 pkg/raft/kv.go create mode 100644 pkg/raft/raft.go create mode 100644 pkg/raft/tls/stream.go create mode 100644 pkg/util/crash.go create mode 100644 pkg/vip/arp.go create mode 100644 pkg/vip/arp_linux.go.bak create mode 100644 pkg/vip/arp_linux2.go create mode 100644 pkg/vip/vip.go create mode 100755 run_etcd.sh create mode 100755 run_raft.sh diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..50546b5 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +data/ +/vipman diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e8eb5b4 --- /dev/null +++ b/Makefile @@ -0,0 +1,55 @@ +CC=go +BUILD=build -v -trimpath +VERSION=$(shell cat VERSION) +GCFLAGS=-gcflags '-e' +LDFLAGS=-ldflags '-X main.version=$(VERSION) -s -w' +PROGRAM=vipman +CMD=-o vipman cmd/vipman/main.go +ENV=CGO_ENABLED=0 GO111MODULE=on + +all: $(PROGRAM) + +setup: + $(CC) get -u github.com/client9/misspell + +release: clean generate gofmt codeqa + $(ENV) $(CC) $(BUILD) $(GCFLAGS) $(LDFLAGS) $(CMD) + +release-vendor: clean generate gofmt codeqa + $(ENV) $(CC) $(BUILD) -mod=vendor $(GCFLAGS) $(LDFLAGS) $(CMD) + +vendor: clean generate gofmt + $(ENV) $(CC) $(BUILD) -mod=vendor $(GCFLAGS) $(LDFLAGS) $(CMD) + +$(PROGRAM): clean generate gofmt + $(ENV) $(CC) $(BUILD) $(GCFLAGS) $(LDFLAGS) $(CMD) + +clean: + $(CC) clean -x + +codeqa: misspell golint test + +generate: + $(CC) generate + +gofmt: + gofmt -w pkg/ cmd/ + +golint: + $(GOPATH)/bin/golint . + +misspell: + $(GOPATH)/bin/misspell pkg/* cmd/* Makefile README.md vipman.yaml + +test: +ifeq ($(shell go env GOARCH), $(shell go env GOHOSTARCH)) +ifeq ($(shell go env GOOS), $(shell go env GOHOSTOS)) + $(CC) test ./... +else + $(info skipping tests of other platforms) +endif +else + $(info skipping tests of other platforms) +endif + +.PHONY: setup release release-vendor vendor build clean codeqa generate gofmt golint misspell test diff --git a/TODO b/TODO new file mode 100644 index 0000000..55fca48 --- /dev/null +++ b/TODO @@ -0,0 +1,7 @@ +test etcd +* user/password +* multi node + +usr arp lib https://godoc.org/github.com/mdlayher/arp ? +* https://github.com/metallb/metallb/blob/main/internal/layer2/arp.go#L50 +add google copyright to arp ocde? diff --git a/VERSION b/VERSION new file mode 100644 index 0000000..49d5957 --- /dev/null +++ b/VERSION @@ -0,0 +1 @@ +0.1 diff --git a/cmd/vipman/main.go b/cmd/vipman/main.go new file mode 100644 index 0000000..fb93d8a --- /dev/null +++ b/cmd/vipman/main.go @@ -0,0 +1,72 @@ +package main + +import ( + "flag" + "os" + "os/signal" + "syscall" + + "git.giftfish.de/ston1th/vipman/pkg/cluster" + "git.giftfish.de/ston1th/vipman/pkg/config" + "git.giftfish.de/ston1th/vipman/pkg/controller" + "git.giftfish.de/ston1th/vipman/pkg/etcd" + "git.giftfish.de/ston1th/vipman/pkg/raft" + "github.com/go-logr/logr" + "k8s.io/klog/v2" + "k8s.io/klog/v2/klogr" +) + +var ( + configFile string + version string + log logr.Logger +) + +func main() { + klog.InitFlags(nil) + flag.StringVar(&configFile, "config", "vipman.yaml", "vipman config file") + flag.Parse() + log = klogr.New().WithName("main") + log.Info("starting vipman", "version", version) + cfg, err := config.ParseFile(configFile) + if err != nil { + klog.Fatalf("init failed: %s", err) + } + + var c cluster.Cluster + if cfg.Cluster.Raft != nil { + log.Info("creating cluster", "mode", "raft") + c = raft.NewCluster(klogr.New().WithName("raft")) + } else if cfg.Cluster.Etcd != nil { + log.Info("creating cluster", "mode", "etcd") + c = etcd.NewCluster(klogr.New().WithName("etcd")) + } + callbacks, err := controller.NewVIPController(cfg) + if err != nil { + klog.Fatalf("init failed: %s", err) + } + err = c.SetCallbacks(callbacks) + if err != nil { + klog.Fatalf("init failed: %s", err) + } + go func() { + err = c.Start(cfg) + if err != nil { + klog.Fatalf("init failed: %s", err) + } + }() + go func() { + sig := make(chan os.Signal) + signal.Notify(sig, syscall.SIGHUP) + for { + <-sig + c.Stepdown() + } + }() + sigs := make(chan os.Signal) + signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) + <-sigs + log.Info("vipman shutdown") + c.Stop() + log.Info("vipman stopped") +} diff --git a/config.tpl b/config.tpl new file mode 100644 index 0000000..616854d --- /dev/null +++ b/config.tpl @@ -0,0 +1,30 @@ +global + daemon + chroot /var/lib/haproxy + user haproxy + group haproxy + maxconn 5000 +defaults + mode tcp + log global + retries 2 + timeout connect 3000ms + timeout server 5000ms + timeout client 5000ms + timeout tunnel 3600s + timeout check 10s +{{ range $item := .Data -}} +frontend fr_{{ $item.Name }} + bind {{ $item.IP }}:{{ $item.Port }} + option tcplog + option splice-request + default_backend ba_{{ $item.Name }} +backend ba_{{ $item.Name }} + balance roundrobin + option splice-response + default-server inter 3s downinter 10s fall 2 rise 2 on-marked-down shutdown-sessions {{ $item.Options }} + # send-proxy-v2 + {{ range $srv := $item.Servers -}} + server {{ $srv.Name }} {{ $srv.IP }}:{{ $srv.Port }} check + {{ end -}} +{{ end -}} diff --git a/etcd.sh b/etcd.sh new file mode 100755 index 0000000..3a7046f --- /dev/null +++ b/etcd.sh @@ -0,0 +1,12 @@ +REGISTRY=gcr.io/etcd-development/etcd +NODE1=127.0.0.1 +docker run \ + --rm -ti \ + -p 2379:2379 \ + -p 2380:2380 \ + --name etcd ${REGISTRY}:latest \ + /usr/local/bin/etcd \ + --data-dir=/etcd-data --name node1 \ + --initial-advertise-peer-urls http://${NODE1}:2380 --listen-peer-urls http://0.0.0.0:2380 \ + --advertise-client-urls http://${NODE1}:2379 --listen-client-urls http://0.0.0.0:2379 \ + --initial-cluster node1=http://${NODE1}:2380 diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..024bce2 --- /dev/null +++ b/go.mod @@ -0,0 +1,29 @@ +module git.giftfish.de/ston1th/vipman + +go 1.15 + +require ( + git.giftfish.de/ston1th/raftbbolt v0.0.0-20201114165203-b85c94bfc9b0 + github.com/coreos/etcd v3.3.25+incompatible + github.com/coreos/go-semver v0.3.0 // indirect + github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect + github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect + github.com/envoyproxy/go-control-plane v0.9.4 // indirect + github.com/go-logr/logr v0.3.0 + github.com/gogo/protobuf v1.3.1 // indirect + github.com/golang/protobuf v1.4.3 // indirect + github.com/google/go-cmp v0.5.0 // indirect + github.com/google/uuid v1.1.2 // indirect + github.com/hashicorp/go-hclog v0.15.0 + github.com/hashicorp/raft v1.2.0 + github.com/mdlayher/arp v0.0.0-20191213142603-f72070a231fc + github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7 + github.com/vishvananda/netlink v1.1.0 + go.etcd.io/etcd v3.3.25+incompatible + go.uber.org/zap v1.16.0 + google.golang.org/grpc v1.26.0 // indirect + gopkg.in/yaml.v2 v2.3.0 + k8s.io/klog/v2 v2.4.0 +) + +replace github.com/coreos/bbolt => go.etcd.io/bbolt v1.3.5 diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..a04b0cb --- /dev/null +++ b/go.sum @@ -0,0 +1,210 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +git.giftfish.de/ston1th/raftbbolt v0.0.0-20201114165203-b85c94bfc9b0 h1:DU0PVdA2EHz2LFGEdkwgJopL9HQh5nFC9GJ7oqzZ300= +git.giftfish.de/ston1th/raftbbolt v0.0.0-20201114165203-b85c94bfc9b0/go.mod h1:9dF/aHYkXts6/6oVyJ+vzXCn7NURDaoREaanX0aspx0= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ= +github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM= +github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg= +github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= +github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag= +github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod 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h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU= +gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= +k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8= +k8s.io/klog/v2 v2.4.0 h1:7+X0fUguPyrKEC4WjH8iGDg3laWgMo5tMnRTIGTTxGQ= +k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y= diff --git a/pkg/api/api.go b/pkg/api/api.go new file mode 100644 index 0000000..34ee33f --- /dev/null +++ b/pkg/api/api.go @@ -0,0 +1,7 @@ +package api + +type Route struct { + Path string + Handler http.HandlerFunc + Methods []string +} diff --git a/pkg/api/v1/schema/schema.go b/pkg/api/v1/schema/schema.go new file mode 100644 index 0000000..04747c1 --- /dev/null +++ b/pkg/api/v1/schema/schema.go @@ -0,0 +1,34 @@ +package schema + +/* +healthCheckNodePort + +*/ + +type LBConfig struct { + LoadBalancers []LoadBalancer +} + +type LoadBalancer struct { + Name string `json:"name"` + IP string `json:"ip"` + Options Options `json:"options,omitempty"` + Ports []Port `json:"ports,omitempty"` +} + +type Options struct { + Frontend []string `json:"frontend,omitempty"` + Backend []string `json:"backend,omitempty"` + DefaultServer string `json:"defaultServer,omitempty` +} + +type Port struct { + Port int `json:"port,omitempty"` + Servers []Server `json:"servers,omitempty"` +} + +type Server struct { + Name string `json:"name,omitempty"` + IP string `json:"ip,omitempty"` + Port int `json:"port,omitempty"` +} diff --git a/pkg/api/v1/server/context.go b/pkg/api/v1/server/context.go new file mode 100644 index 0000000..eed4ae4 --- /dev/null +++ b/pkg/api/v1/server/context.go @@ -0,0 +1,103 @@ +package server + +import ( + "encoding/json" + "fmt" + "net/http" + + "github.com/gorilla/mux" +) + +func newContext(w http.ResponseWriter, r *http.Request, srv *Server) *Context { + h := w.Header() + h.Set("Content-Type", "application/json") + return &Context{ + Status: http.StatusOK, + Request: r, + Response: w, + s: srv, + } +} + +// Context is the context object shared between http handlers +type Context struct { + Body []byte + Status int + + Request *http.Request + Response http.ResponseWriter + s *Server +} + +// Method returns the request method +func (c *Context) Method() string { + return c.Request.Method +} + +// GetHeader returns the given http header +func (c *Context) GetHeader(name string) string { + return c.Request.Header.Get(name) +} + +// SetHeader sets the given http header +func (c *Context) SetHeader(name, value string) { + h := c.Response.Header() + h.Set(name, value) +} + +// Form returns the given form value +func (c *Context) Form(name string) string { + return c.Request.FormValue(name) +} + +// Var returns the given url variable +func (c *Context) Var(name string) (ret string) { + ret, _ = mux.Vars(c.Request)[name] + return +} + +func (c *Context) log() { + c.s.log.Info("access", + "addr", c.Request.RemoteAddr, + "method", c.Request.Method, + "url", c.Request.URL, + "status", c.Status, + ) +} + +func (c *Context) NotFound() { + c.Status = http.StatusNotFound + c.Response.WriteHeader(http.StatusNotFound) + c.Response.Write([]byte(`{"message":"not found","status":404}`)) + c.log() +} + +// OK is a empty HTTP 200 JSON response +func (c *Context) OK() { + c.Response.Write([]byte("{}")) + c.log() +} + +// JSON is a json response +func (c *Context) JSON(v interface{}) { + err := json.NewEncoder(c.Response).Encode(v) + if err != nil { + c.Err(ise) + return + } + c.log() +} + +// Err is a HTTPErr wrapper for the custom Error type +func (c *Context) Err(err Error) { + c.HTTPErr(err.Error(), err.Status()) +} + +// HTTPErr is a http.Error wrapper +func (c *Context) HTTPErr(err string, status int) { + c.Status = status + http.Error(c.Response, err, status) + c.log() +} + +type ctxHandler func(*Context) diff --git a/pkg/api/v1/server/handler.go b/pkg/api/v1/server/handler.go new file mode 100644 index 0000000..5cd41c7 --- /dev/null +++ b/pkg/api/v1/server/handler.go @@ -0,0 +1,24 @@ +package server + +import ( + "net/http" +) + +type notFoundHandler struct { + s *Server +} + +func (nf *notFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + newContext(w, r, nf.s).NotFound() +} + +func authHandler(h ctxHandler) ctxHandler { + return func(ctx *Context) { + // TODO + h(ctx) + } +} + +func healthzHandler(ctx *Context) { + ctx.OK() +} diff --git a/pkg/api/v1/server/routes.go b/pkg/api/v1/server/routes.go new file mode 100644 index 0000000..9027ae4 --- /dev/null +++ b/pkg/api/v1/server/routes.go @@ -0,0 +1,21 @@ +package server + +import ( + "git.giftfish.de/ston1th/haproxy-lb/pkg/api" + "git.giftfish.de/ston1th/haproxy-lb/pkg/api/v1/schema" +) + +const version = "/" + schema.Version + +var routes = []api.Route{ + { + "/healthz", + healthzHandler, + []string{"GET"}, + }, + { + version + "/alloc", + authHandler(allocHandler), + []string{"POST"}, + }, +} diff --git a/pkg/api/v1/server/server.go b/pkg/api/v1/server/server.go new file mode 100644 index 0000000..dcf3ef4 --- /dev/null +++ b/pkg/api/v1/server/server.go @@ -0,0 +1,92 @@ +package server + +import ( + "context" + stdtls "crypto/tls" + "io/ioutil" + "log" + "net" + "net/http" + "path/filepath" + "time" + + "github.com/go-logr/logr" + "github.com/gorilla/mux" +) + +// Server is the webapp and api server +type Server struct { + srv *http.Server + mux *mux.Router + log logr.Logger + + stop chan struct{} + stopKeyReset chan struct{} + + cert string + key string + laddr string + + debug bool +} + +// NewHTTPServer returns a new HTTPServer +func NewServer(log logr.Logger) *Server { + s := &Server{ + mux: mux.NewRouter(), + log: log, + + stop: make(chan struct{}), + stopKeyReset: make(chan struct{}), + + cert: filepath.Join(core.C.DataDir, core.C.HTTP.Cert), + key: filepath.Join(core.C.DataDir, core.C.HTTP.Key), + laddr: net.JoinHostPort(core.C.HTTP.Address, core.C.HTTP.Port), + + debug: core.C.Debug, + } + s.mux.NotFoundHandler = ¬FoundHandler{s} + for _, v := range routes { + s.mux.HandleFunc(v.Path, s.contextWrapper(v.Handler)).Methods(v.Methods...) + } + s.start() + return s +} + +func (s *Server) start() error { + l, err := tls.Listen("tcp", h.laddr, cfg) + if err != nil { + return err + } + h.srv = &http.Server{ + Handler: h.mux, + TLSConfig: cfg, + ReadTimeout: 10 * time.Second, + WriteTimeout: 10 * time.Second, + } + go func() { + err := h.srv.Serve(l) + if err != nil { + s.log.Error(err, "") + } + }() + return nil +} + +func (s *Server) contextWrapper(h ctxHandler) http.HandlerFunc { + return func(w http.ResponseWriter, r *http.Request) { + h(newContext(w, r, s)) + } +} + +// Stop stops listening for incoming connections and closes currently open connections +func (s *Server) Stop() { + s.log.Info("stopping") + ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) + defer cancel() + err := h.srv.Shutdown(ctx) + if err != nil { + s.log.Error(err, "") + } + s.log.Info("stopped") +} diff --git a/pkg/cluster/cluster.go b/pkg/cluster/cluster.go new file mode 100644 index 0000000..ca755df --- /dev/null +++ b/pkg/cluster/cluster.go @@ -0,0 +1,33 @@ +package cluster + +import ( + "context" + + "git.giftfish.de/ston1th/vipman/pkg/config" + "github.com/go-logr/logr" +) + +type Cluster interface { + Start(*config.Config) error + SetCallbacks(Callbacks) error + Stepdown() + Stop() +} + +type KV interface { + Get(k string) ([]byte, error) + Set(k string, v []byte) error + Delete(k string) error +} + +type CallbackContext interface { + logr.Logger + KV + ID() string +} + +type Callbacks struct { + Leader func(context.Context, CallbackContext) + Follower func(context.Context, CallbackContext) + Cleanup func(context.Context, CallbackContext) +} diff --git a/pkg/config/ca.go b/pkg/config/ca.go new file mode 100644 index 0000000..2304117 --- /dev/null +++ b/pkg/config/ca.go @@ -0,0 +1,19 @@ +package config + +import ( + "crypto/x509" + "io/ioutil" +) + +func LoadCertPool(file string) (p *x509.CertPool, err error) { + if file == "" { + return + } + buf, err := ioutil.ReadFile(file) + if err != nil { + return + } + p = x509.NewCertPool() + p.AppendCertsFromPEM(buf) + return +} diff --git a/pkg/config/config.go b/pkg/config/config.go new file mode 100644 index 0000000..6827588 --- /dev/null +++ b/pkg/config/config.go @@ -0,0 +1,159 @@ +package config + +import ( + "errors" + "fmt" + "os" + "path/filepath" + "strings" + + "gopkg.in/yaml.v2" +) + +const ( + RaftDir = "raft" + RaftPort = 7001 + RaftLogLevel = "off" + + EtcdLogLevel = "error" + EtcdPrefix = "/vipman" +) + +func ParseFile(file string) (cfg *Config, err error) { + if file == "" { + return nil, errors.New("missing config file") + } + f, err := os.Open(file) + if err != nil { + return + } + defer f.Close() + cfg = new(Config) + err = yaml.NewDecoder(f).Decode(cfg) + if err != nil { + return + } + err = Validate(cfg) + return +} + +func Validate(c *Config) error { + if len(c.VirtualIPs) == 0 { + return errors.New("missing virtualIPs config") + } + if c.LeaderHook != "" { + if !filepath.IsAbs(c.LeaderHook) { + return errors.New("leaderHook path must be absolute") + } + } + if c.FollowerHook != "" { + if !filepath.IsAbs(c.FollowerHook) { + return errors.New("followerHook path must be absolute") + } + } + raft := c.Cluster.Raft + if raft != nil { + if raft.LogLevel == "" { + raft.LogLevel = RaftLogLevel + } + if raft.Dir == "" { + raft.Dir = RaftDir + } + if raft.ID == "" { + return errors.New("missing raft.id config") + } + if raft.Address == "" { + return errors.New("missing raft.address config") + } + if len(raft.Peers) < 2 { + return errors.New("minimum number of remote peers: 2") + } + for i, v := range raft.Peers { + if v.ID == "" { + return fmt.Errorf("missing raft.peers[%d].id config", i) + } + if v.Address == "" { + return fmt.Errorf("missing raft.peers[%d].address config", i) + } + } + } + etcd := c.Cluster.Etcd + if etcd != nil { + if etcd.LogLevel == "" { + etcd.LogLevel = EtcdLogLevel + } + if len(etcd.Endpoints) == 0 { + return errors.New("missing etcd.endpoints config") + } + if etcd.Prefix == "" { + etcd.Prefix = EtcdPrefix + } else { + if !strings.HasPrefix(etcd.Prefix, "/") { + etcd.Prefix = "/" + etcd.Prefix + } + if strings.HasSuffix(etcd.Prefix, "/") { + etcd.Prefix = strings.TrimSuffix(etcd.Prefix, "/") + } + } + if etcd.ClusterName == "" { + return errors.New("missing etcd.clusterName config") + } else { + if strings.HasSuffix(etcd.ClusterName, "/") { + etcd.ClusterName = strings.TrimSuffix(etcd.ClusterName, "/") + } + } + } + if raft == nil && etcd == nil { + return errors.New("missing cluster config: raft or etcd") + } + if raft != nil && etcd != nil { + return errors.New("only one cluster config allowed: raft or etcd") + } + return nil +} + +type Config struct { + VirtualIPs []string `yaml:"virtualIPs"` + Interface string `yaml:"interface,omitempty"` + Label string `yaml:"label,omitempty"` + LeaderHook string `yaml:"leaderHook,omitempty"` + FollowerHook string `yaml:"followerHook,omitempty"` + Cluster Cluster `yaml:"cluster"` +} + +type Cluster struct { + Raft *Raft `yaml:"raft,omitempty"` + Etcd *Etcd `yaml:"etcd,omitempty"` +} + +type Raft struct { + Dir string `yaml:"dir,omitempty"` + ID string `yaml:"id"` + Address string `yaml:"address"` + Peers []RaftPeer `yaml:"peers"` + TLS *TLS `yaml:"tls,omitempty"` + LogLevel string `yaml:"logLevel,omitempty"` +} + +type TLS struct { + Cert string `yaml:"cert,omitempty"` + Key string `yaml:"key,omitempty"` + CA string `yaml:"ca,omitempty"` + Insecure bool `yaml:"insecure,omitempty"` +} + +// RaftPeer details the configuration of all cluster peers +type RaftPeer struct { + ID string `yaml:"id"` + Address string `yaml:"address"` +} + +type Etcd struct { + Endpoints []string `yaml:"endpoints"` + Prefix string `yaml:"prefix"` + ClusterName string `yaml:"clusterName"` + Username string `yaml:"username,omitempty"` + Password string `yaml:"password,omitempty"` + TLS *TLS `yaml:"tls,omitempty"` + LogLevel string `yaml:"logLevel,omitempty"` +} diff --git a/pkg/controller/vip.go b/pkg/controller/vip.go new file mode 100644 index 0000000..eb296d8 --- /dev/null +++ b/pkg/controller/vip.go @@ -0,0 +1,91 @@ +package controller + +import ( + "context" + "os/exec" + "time" + + "git.giftfish.de/ston1th/vipman/pkg/cluster" + "git.giftfish.de/ston1th/vipman/pkg/config" + "git.giftfish.de/ston1th/vipman/pkg/vip" + "github.com/go-logr/logr" +) + +func NewVIPController(cfg *config.Config) (callbacks cluster.Callbacks, err error) { + n, err := vip.NewNetworkWithLabel(cfg.Interface, cfg.Label) + if err != nil { + return + } + callbacks = cluster.Callbacks{ + Leader: func(ctx context.Context, cc cluster.CallbackContext) { + t := time.NewTicker(time.Second * 10) + if cfg.LeaderHook != "" { + go func() { + err := exec.CommandContext(ctx, cfg.LeaderHook).Run() + if err != nil { + cc.Error(err, "error running hook", "leaderHook", cfg.LeaderHook) + } + }() + } + for { + cc.Info("leading", "id", cc.ID()) + addIPs(cc, n, cfg.VirtualIPs) + select { + case <-ctx.Done(): + t.Stop() + deleteIPs(cc, n, cfg.VirtualIPs) + cc.Info("leading canceled", "id", cc.ID()) + return + case <-t.C: + } + } + }, + Follower: func(ctx context.Context, cc cluster.CallbackContext) { + t := time.NewTicker(time.Second * 10) + if cfg.FollowerHook != "" { + go func() { + err := exec.CommandContext(ctx, cfg.FollowerHook).Run() + if err != nil { + cc.Error(err, "error running hook", "followerHook", cfg.FollowerHook) + } + }() + } + for { + cc.Info("following", "id", cc.ID()) + //TODO + //deleteIPs(cc, n, cfg.VirtualIPs) + select { + case <-ctx.Done(): + t.Stop() + cc.Info("following canceled", "id", cc.ID()) + return + case <-t.C: + } + } + }, + Cleanup: func(ctx context.Context, cc cluster.CallbackContext) { + deleteIPs(cc, n, cfg.VirtualIPs) + }, + } + return +} + +func addIPs(log logr.Logger, n *vip.Network, cidrs []string) error { + for _, cidr := range cidrs { + err := n.AddIP(cidr) + if err != nil { + log.Error(err, "adding ip", "interface", n.Interface(), "ip", cidr) + } + } + return nil +} + +func deleteIPs(log logr.Logger, n *vip.Network, cidrs []string) error { + for _, cidr := range cidrs { + err := n.DeleteIP(cidr) + if err != nil { + log.Error(err, "deleting ip", "interface", n.Interface(), "ip", cidr) + } + } + return nil +} diff --git a/pkg/etcd/cluster.go b/pkg/etcd/cluster.go new file mode 100644 index 0000000..2aa3521 --- /dev/null +++ b/pkg/etcd/cluster.go @@ -0,0 +1,82 @@ +package etcd + +import ( + "context" + "errors" + + "git.giftfish.de/ston1th/vipman/pkg/cluster" + //"go.etcd.io/etcd/clientv3" + "github.com/coreos/etcd/clientv3" + "github.com/go-logr/logr" +) + +var ErrKeyNotFound = errors.New("key not found") + +type Cluster struct { + logr.Logger + cli *clientv3.Client + ctx context.Context + + stepdown chan struct{} + stop chan struct{} + done chan struct{} + callbacks cluster.Callbacks + + kvPrefix string + id string + keyID string + session bool + cancelSession func() +} + +func NewCluster(log logr.Logger) cluster.Cluster { + return &Cluster{ + Logger: log, + ctx: context.Background(), + stepdown: make(chan struct{}, 1), + stop: make(chan struct{}, 1), + done: make(chan struct{}, 1), + } +} + +func (c *Cluster) Get(k string) (v []byte, err error) { + r, err := c.cli.Get(c.ctx, c.kvPrefix+"/"+k) + if err != nil { + return + } + if len(r.Kvs) == 0 { + err = ErrKeyNotFound + return + } + v = r.Kvs[0].Value + return +} + +func (c *Cluster) Set(k string, v []byte) (err error) { + _, err = c.cli.Put(c.ctx, c.kvPrefix+"/"+k, string(v)) + return +} + +func (c *Cluster) Delete(k string) (err error) { + _, err = c.cli.Delete(c.ctx, c.kvPrefix+"/"+k) + return +} + +func (c *Cluster) SetCallbacks(callbacks cluster.Callbacks) error { + c.callbacks = callbacks + return c.checkConfig() +} + +func (c *Cluster) ID() string { + return c.id +} + +func (c *Cluster) checkConfig() error { + if c.callbacks.Leader == nil { + return errors.New("Leader callback is nil") + } + if c.callbacks.Follower == nil { + return errors.New("Follower callback is nil") + } + return nil +} diff --git a/pkg/etcd/etcd.go b/pkg/etcd/etcd.go new file mode 100644 index 0000000..f5df23a --- /dev/null +++ b/pkg/etcd/etcd.go @@ -0,0 +1,223 @@ +package etcd + +import ( + "context" + "crypto/tls" + "fmt" + "time" + + "git.giftfish.de/ston1th/vipman/pkg/config" + "git.giftfish.de/ston1th/vipman/pkg/util" + "github.com/coreos/etcd/clientv3" + "go.uber.org/zap" + "go.uber.org/zap/zapcore" + //"go.etcd.io/etcd/clientv3" + "go.etcd.io/etcd/clientv3/concurrency" +) + +func (c *Cluster) Start(etcdcfg *config.Config) error { + err := c.checkConfig() + if err != nil { + return err + } + cfg := etcdcfg.Cluster.Etcd + var level zapcore.Level + err = level.Set(cfg.LogLevel) + if err != nil { + return err + } + al := zap.NewAtomicLevel() + al.SetLevel(level) + var tlsConfig *tls.Config + if cfg.TLS != nil { + ca, err := config.LoadCertPool(cfg.TLS.CA) + if err != nil { + return err + } + tlsConfig = &tls.Config{ + MinVersion: tls.VersionTLS12, + InsecureSkipVerify: cfg.TLS.Insecure, + RootCAs: ca, + } + } + + c.cli, err = clientv3.New(clientv3.Config{ + Endpoints: cfg.Endpoints, + TLS: tlsConfig, + DialTimeout: time.Second * 5, + Username: cfg.Username, + Password: cfg.Password, + LogConfig: &zap.Config{ + Level: al, + Encoding: "console", + DisableCaller: true, + DisableStacktrace: true, + EncoderConfig: zap.NewDevelopmentEncoderConfig(), + OutputPaths: []string{"stderr"}, + ErrorOutputPaths: []string{"stderr"}, + }, + }) + if err != nil { + return err + } + + ctxSsession, cancelSession := context.WithCancel(context.Background()) + c.cancelSession = cancelSession + s, err := concurrency.NewSession(c.cli, + concurrency.WithContext(ctxSsession), + concurrency.WithTTL(10), + ) + if err != nil { + return err + } + c.session = true + + prefix := cfg.Prefix + "/" + cfg.ClusterName + c.kvPrefix = prefix + "/kv" + ePrefix := prefix + "/e" + c.id = fmt.Sprintf("%x", s.Lease()) + c.keyID = ePrefix + "/" + c.id + + e := concurrency.NewElection(s, ePrefix) + ctxCampaign, cancelCampaign := context.WithCancel(context.Background()) + go func() { + errc := make(chan error, 1) + for { + go func() { + errc <- e.Campaign(ctxCampaign, "") + }() + select { + case err := <-errc: + if err != nil { + time.Sleep(time.Second) + } + case <-ctxCampaign.Done(): + return + } + } + }() + + t := time.NewTicker(time.Second) + ctx, cancel := context.WithCancel(context.Background()) + ctxObserve, cancelObserve := context.WithCancel(context.Background()) + leading := false + following := false + leaderChan := c.observe(ctxObserve, e.Observe(ctxObserve)) + for { + if !leading && c.leaderID(e.Leader(ctxObserve)) == c.keyID { + leading = true + go c.leader(ctx) + } else if !following && !leading { + following = true + go c.follower(ctx) + } + + select { + case <-t.C: + case leader := <-leaderChan: + if leader { + if following { + cancel() + following = false + ctx, cancel = context.WithCancel(context.Background()) + } + if !leading { + leading = true + go c.leader(ctx) + } + } else { + if leading { + cancel() + leading = false + ctx, cancel = context.WithCancel(context.Background()) + } + if !following { + following = true + go c.follower(ctx) + } + } + case <-c.stepdown: + cancel() + ctx, cancel = context.WithCancel(context.Background()) + ctxResign, _ := context.WithTimeout(context.Background(), time.Second*2) + e.Resign(ctxResign) + case <-c.stop: + t.Stop() + cancel() + cancelObserve() + cancelCampaign() + if leading { + ctx, _ := context.WithTimeout(context.Background(), time.Second*2) + e.Resign(ctx) + } + if c.callbacks.Cleanup != nil { + ctx, _ := context.WithTimeout(context.Background(), time.Second*2) + c.callbacks.Cleanup(ctx, c) + } + s.Close() + close(c.done) + return nil + } + } + return nil +} + +func (c *Cluster) leaderID(r *clientv3.GetResponse, err error) string { + if err != nil { + return "" + } + if len(r.Kvs) == 0 { + return "" + } + return string(r.Kvs[0].Key) +} + +func (c *Cluster) observe(ctx context.Context, resp <-chan clientv3.GetResponse) <-chan bool { + leader := make(chan bool) + go func() { + for { + select { + case r := <-resp: + if c.leaderID(&r, nil) == c.keyID { + leader <- true + } else { + leader <- false + } + case <-ctx.Done(): + return + } + } + }() + return leader +} + +func (c *Cluster) Stepdown() { + select { + case c.stepdown <- struct{}{}: + case <-time.After(time.Second * 2): + } +} + +func (c *Cluster) Stop() { + if !c.session { + c.cancelSession() + return + } + close(c.stop) + <-c.done + c.cli.Close() +} + +func (c *Cluster) leader(ctx context.Context) { + defer func() { + util.HandleCrash() + }() + c.callbacks.Leader(ctx, c) +} + +func (c *Cluster) follower(ctx context.Context) { + defer func() { + util.HandleCrash() + }() + c.callbacks.Follower(ctx, c) +} diff --git a/pkg/haproxy/haproxy.go b/pkg/haproxy/haproxy.go new file mode 100644 index 0000000..1c67d12 --- /dev/null +++ b/pkg/haproxy/haproxy.go @@ -0,0 +1,67 @@ +package haproxy + +import ( + "context" + "io/ioutil" + "os" + "sync" + "text/template" +) + +type ServiceManager interface { + Reload() +} + +type HAProxyManager struct { + sync.Mutex + + configFile string + serviceManager ServiceManager + template *template.Template +} + +func NewHAProxyManager(configFile string) (*HAProxyManager, error) { + t, err := template.New("haproxy").Parse(haproxyTemplate) + if err != nil { + return nil, err + } + return &HAProxyManager{ + configFile: configFile, + serviceManager: NewSystemdManager("haproxy"), + template: t, + }, nil +} + +func (ha *HAProxyManager) checkConfig(ctx context.Context, configFile string) error { + return exec.CommandContext(ctx, "haproxy", "-c", "-f", configFile).Run() +} + +func (ha *HAProxyManager) UpdateConfig(ctx context.Context, lbs []config.LoadBalancer) error { + ha.Lock() + defer ha.Unlock() + tmp, err := ioutil.TempFile(os.TempDir(), "haproxy_") + if err != nil { + return err + } + defer tmp.Close() + defer os.Remove(tmp.Name()) + err = ha.template.Execute(tmp, lbs) + if err != nil { + return err + } + err = ha.checkConfig(ctx, tmp.Name()) + if err != nil { + return err + } + file, err := os.OpenFile(ha.configFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644) + if err != nil { + return err + } + err = ha.template.Execute(file, lbs) + if err != nil { + file.Close() + return err + } + file.Close() + return ha.serviceManager.Reload() +} diff --git a/pkg/haproxy/systemd.go b/pkg/haproxy/systemd.go new file mode 100644 index 0000000..617a52a --- /dev/null +++ b/pkg/haproxy/systemd.go @@ -0,0 +1,20 @@ +package haproxy + +import ( + "context" + "os/exec" +) + +const systemctl = "systemctl" + +type SystemdManager struct { + service string +} + +func NewSystemdManager(service string) *SystemdManager { + return &SystemdManager{service} +} + +func (sm *SystemdManager) Reload(ctx context.Context) error { + return exec.CommandContext(ctx, systemctl, "reload", sm.service).Run() +} diff --git a/pkg/haproxy/template.go b/pkg/haproxy/template.go new file mode 100644 index 0000000..6b9d71a --- /dev/null +++ b/pkg/haproxy/template.go @@ -0,0 +1,43 @@ +package haproxy + +const haproxyConfigTemplate = `global + daemon + chroot /var/lib/haproxy + user haproxy + group haproxy + maxconn 5000 +defaults + mode tcp + log global + retries 2 + timeout connect 3000ms + timeout server 5000ms + timeout client 5000ms + timeout tunnel 3600s + timeout check 10s +{{ range $item := . -}} +{{ range $port := $item.Ports -}} +frontend fr_{{ $item.Name }}_{{ $port.Port }} + bind {{ $item.IP }}:{{ $port.Port }} + {{ range $opt := $item.Options.Frontend -}} + option {{ $opt }} + {{ end -}} + # option tcplog + # option splice-request + default_backend ba_{{ $item.Name }}_{{ $port.Port }} +backend ba_{{ $item.Name }}_{{ $port.Port }} + balance roundrobin + {{ range $opt := $item.Options.Backend -}} + option {{ $opt }} + {{ end -}} + # option splice-response + # option httpchk GET / + default-server inter 3s downinter 10s fall 2 rise 2 on-marked-down shutdown-sessions {{ $item.Options.DefaultServer }} + # send-proxy-v2 + # check-send-proxy + # port + {{ range $srv := $port.Servers -}} + server {{ $srv.Name }} {{ $srv.IP }}:{{ $srv.Port }} check + {{ end -}} +{{ end -}} +{{ end -}}` diff --git a/pkg/raft/cluster.go b/pkg/raft/cluster.go new file mode 100644 index 0000000..e581102 --- /dev/null +++ b/pkg/raft/cluster.go @@ -0,0 +1,56 @@ +package raft + +import ( + "errors" + + "git.giftfish.de/ston1th/vipman/pkg/cluster" + "github.com/go-logr/logr" + "github.com/hashicorp/raft" +) + +type Cluster struct { + logr.Logger + cluster.KV + r *raft.Raft + + kvm *kv + stepdown chan struct{} + stop chan struct{} + done chan struct{} + callbacks cluster.Callbacks + + id string +} + +func NewCluster(log logr.Logger) cluster.Cluster { + kvm := &kv{ + m: make(map[string][]byte), + } + return &Cluster{ + Logger: log, + KV: kvm, + kvm: kvm, + stepdown: make(chan struct{}, 1), + stop: make(chan struct{}, 1), + done: make(chan struct{}, 1), + } +} + +func (c *Cluster) ID() string { + return c.id +} + +func (c *Cluster) SetCallbacks(callbacks cluster.Callbacks) error { + c.callbacks = callbacks + return c.checkConfig() +} + +func (c *Cluster) checkConfig() error { + if c.callbacks.Leader == nil { + return errors.New("Leader callback is nil") + } + if c.callbacks.Follower == nil { + return errors.New("Follower callback is nil") + } + return nil +} diff --git a/pkg/raft/fsm.go b/pkg/raft/fsm.go new file mode 100644 index 0000000..6e531fb --- /dev/null +++ b/pkg/raft/fsm.go @@ -0,0 +1,99 @@ +package raft + +import ( + "fmt" + "io" + "time" + + "git.giftfish.de/ston1th/raftbbolt/msgpack" + "github.com/hashicorp/raft" +) + +const ( + retainSnapshotCount = 2 + raftTimeout = 10 * time.Second +) + +type Op uint8 + +const ( + SET Op = iota + DELETE +) + +type raftCmd struct { + Op Op + K string + V []byte +} + +type fsm kv + +func (f *fsm) Apply(l *raft.Log) interface{} { + var c raftCmd + if err := msgpack.Unmarshal(l.Data, &c); err != nil { + panic(fmt.Sprintf("failed to unmarshal command: %s", err.Error())) + } + + switch c.Op { + case SET: + f.applySet(c.K, c.V) + case DELETE: + f.applyDelete(c.K) + default: + panic(fmt.Sprintf("unrecognized command op: %d", c.Op)) + } + return nil +} + +func (f *fsm) Snapshot() (raft.FSMSnapshot, error) { + f.mu.Lock() + defer f.mu.Unlock() + m := make(kvm) + for k, v := range f.m { + m[k] = v + } + return &fsmSnapshot{m: m}, nil +} + +func (f *fsm) Restore(rc io.ReadCloser) error { + o := make(kvm) + if err := msgpack.NewDecoder(rc).Decode(&o); err != nil { + return err + } + f.m = o + return nil +} + +func (f *fsm) applySet(k string, v []byte) { + f.mu.Lock() + f.m[k] = v + f.mu.Unlock() +} + +func (f *fsm) applyDelete(k string) { + f.mu.Lock() + delete(f.m, k) + f.mu.Unlock() +} + +type fsmSnapshot struct { + m kvm +} + +func (f *fsmSnapshot) Persist(sink raft.SnapshotSink) error { + err := func() error { + err := msgpack.NewEncoder(sink).Encode(f.m) + if err != nil { + return err + } + return sink.Close() + }() + + if err != nil { + sink.Cancel() + } + return err +} + +func (f *fsmSnapshot) Release() {} diff --git a/pkg/raft/kv.go b/pkg/raft/kv.go new file mode 100644 index 0000000..8c14923 --- /dev/null +++ b/pkg/raft/kv.go @@ -0,0 +1,56 @@ +package raft + +import ( + "errors" + "sync" + + "git.giftfish.de/ston1th/raftbbolt/msgpack" + "github.com/hashicorp/raft" +) + +var ErrNotLeader = errors.New("not leader") + +type kvm map[string][]byte + +type kv struct { + mu sync.Mutex + m kvm + r *raft.Raft +} + +func (kv *kv) Get(k string) ([]byte, error) { + kv.mu.Lock() + defer kv.mu.Unlock() + return kv.m[k], nil +} + +func (kv *kv) Set(k string, v []byte) error { + if kv.r.State() != raft.Leader { + return ErrNotLeader + } + + c := &raftCmd{SET, k, v} + b, err := msgpack.Marshal(c) + if err != nil { + return err + } + + f := kv.r.Apply(b, raftTimeout) + return f.Error() +} + +// Delete deletes the given key. +func (kv *kv) Delete(k string) error { + if kv.r.State() != raft.Leader { + return ErrNotLeader + } + + c := &raftCmd{Op: DELETE, K: k} + b, err := msgpack.Marshal(c) + if err != nil { + return err + } + + f := kv.r.Apply(b, raftTimeout) + return f.Error() +} diff --git a/pkg/raft/raft.go b/pkg/raft/raft.go new file mode 100644 index 0000000..afbdad9 --- /dev/null +++ b/pkg/raft/raft.go @@ -0,0 +1,202 @@ +package raft + +import ( + "context" + "fmt" + "net" + "os" + "path/filepath" + "time" + + "git.giftfish.de/ston1th/raftbbolt" + "git.giftfish.de/ston1th/vipman/pkg/config" + "git.giftfish.de/ston1th/vipman/pkg/raft/tls" + "git.giftfish.de/ston1th/vipman/pkg/util" + hclog "github.com/hashicorp/go-hclog" + "github.com/hashicorp/raft" +) + +func (c *Cluster) Start(raftcfg *config.Config) error { + err := c.checkConfig() + if err != nil { + return err + } + cfg := raftcfg.Cluster.Raft + hcl := hclog.New(&hclog.LoggerOptions{ + Name: "raft", + Level: hclog.LevelFromString(cfg.LogLevel), + Output: hclog.DefaultOutput, + TimeFormat: "I0102 15:04:05.000000", + }) + + rc := raft.DefaultConfig() + rc.ProtocolVersion = 3 + rc.LocalID = raft.ServerID(cfg.ID) + rc.Logger = hcl + c.id = cfg.ID + + pool := 3 + timeout := 10 * time.Second + var transport *raft.NetworkTransport + if cfg.TLS != nil { + c.V(1).Info("setup", "transport", "tls") + s, err := tls.NewStream(cfg) + if err != nil { + return err + } + transport = raft.NewNetworkTransportWithLogger(s, pool, timeout, hcl) + } else { + c.V(1).Info("setup", "transport", "tcp") + address, err := net.ResolveTCPAddr("tcp", cfg.Address) + if err != nil { + return err + } + transport, err = raft.NewTCPTransportWithLogger(cfg.Address, address, pool, timeout, hcl) + if err != nil { + return err + } + } + + // Create Raft structures + //snapshots := raft.NewInmemSnapshotStore() + snapshots, err := raft.NewFileSnapshotStoreWithLogger(cfg.Dir, retainSnapshotCount, hcl) + if err != nil { + return fmt.Errorf("file snapshot store: %s", err) + } + + store := filepath.Join(cfg.Dir, "store.db") + + //logStore := raft.NewInmemStore() + bootstrap := true + if _, err := os.Stat(store); err == nil { + bootstrap = false + } + + stableStore, err := raftbbolt.NewStore(store) + if err != nil { + return err + } + logStore := stableStore + + // Cluster configuration + configuration := raft.Configuration{} + + // Add Local Peer + configuration.Servers = append(configuration.Servers, raft.Server{ + ID: raft.ServerID(cfg.ID), + Address: raft.ServerAddress(cfg.Address), + }) + for _, p := range cfg.Peers { + if cfg.Address != p.Address { + configuration.Servers = append(configuration.Servers, raft.Server{ + ID: raft.ServerID(p.ID), + Address: raft.ServerAddress(p.Address)}) + } + } + + if bootstrap { + if err := raft.BootstrapCluster(rc, logStore, stableStore, snapshots, transport, configuration); err != nil { + return err + } + } + + c.r, err = raft.NewRaft(rc, (*fsm)(c.kvm), logStore, stableStore, snapshots, transport) + if err != nil { + return err + } + c.kvm.r = c.r + + t := time.NewTicker(time.Second) + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + leading := false + following := false + for { + if !leading && cfg.Address == string(c.r.Leader()) { + leading = true + go c.leader(ctx) + } else if !following && !leading { + following = true + go c.follower(ctx) + } + + select { + case <-t.C: + case leader := <-c.r.LeaderCh(): + if leader { + if following { + cancel() + following = false + ctx, cancel = context.WithCancel(context.Background()) + } + if !leading { + leading = true + go c.leader(ctx) + } + } else if c.r.State() == raft.Follower { + if leading { + cancel() + leading = false + ctx, cancel = context.WithCancel(context.Background()) + } + if !following { + following = true + go c.follower(ctx) + } + } + case <-c.stepdown: + if leading { + cancel() + c.r.LeadershipTransfer().Error() + } + case <-c.stop: + t.Stop() + cancel() + if leading { + c.r.LeadershipTransfer().Error() + } + if c.callbacks.Cleanup != nil { + ctx, _ := context.WithTimeout(context.Background(), time.Second*2) + c.callbacks.Cleanup(ctx, c) + } + close(c.done) + return nil + } + } + return nil +} + +func (c *Cluster) leader(ctx context.Context) { + defer func() { + util.HandleCrash() + }() + c.callbacks.Leader(ctx, c) +} + +func (c *Cluster) follower(ctx context.Context) { + defer func() { + util.HandleCrash() + }() + c.callbacks.Follower(ctx, c) +} + +func (c *Cluster) Stepdown() { + select { + case c.stepdown <- struct{}{}: + case <-time.After(time.Second * 2): + } +} + +func (c *Cluster) Stop() { + close(c.stop) + <-c.done + s := make(chan struct{}) + go func() { + c.r.Shutdown().Error() + close(s) + }() + select { + case <-s: + case <-time.After(time.Second * 5): + } +} diff --git a/pkg/raft/tls/stream.go b/pkg/raft/tls/stream.go new file mode 100644 index 0000000..bde01f1 --- /dev/null +++ b/pkg/raft/tls/stream.go @@ -0,0 +1,63 @@ +package tls + +import ( + "crypto/tls" + "crypto/x509" + "net" + "time" + + "git.giftfish.de/ston1th/vipman/pkg/config" + "github.com/hashicorp/raft" +) + +var ( + ciphers = []uint16{ + tls.TLS_CHACHA20_POLY1305_SHA256, + } + curves = []tls.CurveID{ + tls.X25519, + } +) + +type stream struct { + net.Listener + insecure bool + ca *x509.CertPool +} + +func NewStream(cfg *config.Raft) (s *stream, err error) { + cert, err := tls.LoadX509KeyPair(cfg.TLS.Cert, cfg.TLS.Key) + if err != nil { + return + } + ca, err := config.LoadCertPool(cfg.TLS.CA) + if err != nil { + return + } + l, err := tls.Listen("tcp", cfg.Address, &tls.Config{ + MinVersion: tls.VersionTLS13, + CipherSuites: ciphers, + CurvePreferences: curves, + PreferServerCipherSuites: true, + Certificates: []tls.Certificate{cert}, + }) + if err != nil { + return + } + s = &stream{l, cfg.TLS.Insecure, ca} + return +} + +func (s *stream) Dial(address raft.ServerAddress, timeout time.Duration) (net.Conn, error) { + return tls.DialWithDialer( + &net.Dialer{Timeout: timeout}, + "tcp", string(address), + &tls.Config{ + MinVersion: tls.VersionTLS13, + CipherSuites: ciphers, + CurvePreferences: curves, + InsecureSkipVerify: s.insecure, + RootCAs: s.ca, + }, + ) +} diff --git a/pkg/util/crash.go b/pkg/util/crash.go new file mode 100644 index 0000000..91d5a97 --- /dev/null +++ b/pkg/util/crash.go @@ -0,0 +1,41 @@ +package util + +import ( + "net/http" + "runtime" + + "k8s.io/klog/v2" +) + +var reallyCrash = true + +func HandleCrash() { + if r := recover(); r != nil { + logPanic(r) + if reallyCrash { + panic(r) + } + } +} + +// logPanic logs the caller tree when a panic occurs (except in the special case of http.ErrAbortHandler). +func logPanic(r interface{}) { + if r == http.ErrAbortHandler { + // honor the http.ErrAbortHandler sentinel panic value: + // ErrAbortHandler is a sentinel panic value to abort a handler. + // While any panic from ServeHTTP aborts the response to the client, + // panicking with ErrAbortHandler also suppresses logging of a stack trace to the server's error log. + return + } + + // Same as stdlib http server code. Manually allocate stack trace buffer size + // to prevent excessively large logs + const size = 64 << 10 + stacktrace := make([]byte, size) + stacktrace = stacktrace[:runtime.Stack(stacktrace, false)] + if _, ok := r.(string); ok { + klog.Errorf("Observed a panic: %s\n%s", r, stacktrace) + } else { + klog.Errorf("Observed a panic: %#v (%v)\n%s", r, r, stacktrace) + } +} diff --git a/pkg/vip/arp.go b/pkg/vip/arp.go new file mode 100644 index 0000000..4333498 --- /dev/null +++ b/pkg/vip/arp.go @@ -0,0 +1,10 @@ +// +build !linux + +package vip + +import "fmt" + +// ARPSendGratuitous is only supported on Linux, so return an error +func ARPSendGratuitous(cidr, iface string) error { + return fmt.Errorf("Unsupported on this OS") +} diff --git a/pkg/vip/arp_linux.go.bak b/pkg/vip/arp_linux.go.bak new file mode 100644 index 0000000..af14d3a --- /dev/null +++ b/pkg/vip/arp_linux.go.bak @@ -0,0 +1,173 @@ +// +build linux + +// These syscalls are only supported on Linux, so this uses a build directive during compilation. Other OS's will use the arp_unsupported.go and receive an error + +package vip + +import ( + "bytes" + "encoding/binary" + "fmt" + "net" + "syscall" + "unsafe" +) + +const ( + opARPRequest = 1 + opARPReply = 2 + hwLen = 6 +) + +var ( + ethernetBroadcast = net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff} + // arpRequest is used to flip between garp request or garp reply + arpRequest = true +) + +func htons(p uint16) uint16 { + var b [2]byte + binary.BigEndian.PutUint16(b[:], p) + return *(*uint16)(unsafe.Pointer(&b)) +} + +// arpHeader specifies the header for an ARP message. +type arpHeader struct { + hardwareType uint16 + protocolType uint16 + hardwareAddressLength uint8 + protocolAddressLength uint8 + opcode uint16 +} + +// arpMessage represents an ARP message. +type arpMessage struct { + arpHeader + senderHardwareAddress []byte + senderProtocolAddress []byte + targetHardwareAddress []byte + targetProtocolAddress []byte +} + +// bytes returns the wire representation of the ARP message. +func (m *arpMessage) bytes() ([]byte, error) { + buf := new(bytes.Buffer) + + if err := binary.Write(buf, binary.BigEndian, m.arpHeader); err != nil { + return nil, fmt.Errorf("binary write failed: %v", err) + } + buf.Write(m.senderHardwareAddress) + buf.Write(m.senderProtocolAddress) + buf.Write(m.targetHardwareAddress) + buf.Write(m.targetProtocolAddress) + + return buf.Bytes(), nil +} + +// gratuitousARP return a gARP request or gARP reply alternatively +// because different devices may support either one of them +func gratuitousARP(ip net.IP, mac net.HardwareAddr) (*arpMessage, error) { + if ip.To4() == nil { + return nil, fmt.Errorf("%q is not an IPv4 address", ip) + } + if len(mac) != hwLen { + return nil, fmt.Errorf("%q is not an Ethernet MAC address", mac) + } + + m := &arpMessage{ + arpHeader: arpHeader{ + 1, // Ethernet + 0x0800, // IPv4 + hwLen, // 48-bit MAC Address + net.IPv4len, // 32-bit IPv4 Address + opARPReply, // ARP Reply + }, + } + + // https://tools.ietf.org/html/rfc5944#section-4.6 + // In either case, the ARP Sender Hardware Address is + // set to the link-layer address to which this cache entry should be + // updated. + m.senderHardwareAddress = mac + + // When using an ARP Reply packet, the Target Hardware + // Address is also set to the link-layer address to which this cache + // entry should be updated (this field is not used in an ARP Request + // packet). + m.targetHardwareAddress = mac + + // In either case, the ARP Sender Protocol Address and + // ARP Target Protocol Address are both set to the IP address of the + // cache entry to be updated, + m.senderProtocolAddress = ip.To4() + m.targetProtocolAddress = ip.To4() + + // send arpRequest and arpReply alternatively + arpRequest = !arpRequest + if arpRequest { + m.arpHeader.opcode = opARPRequest + + // this field is not used in an ARP Request packet + m.targetHardwareAddress = ethernetBroadcast + } + + return m, nil +} + +// sendARP sends the given ARP message via the specified interface. +func sendARP(iface *net.Interface, m *arpMessage) error { + fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_DGRAM, int(htons(syscall.ETH_P_ARP))) + if err != nil { + return fmt.Errorf("failed to get raw socket: %v", err) + } + defer syscall.Close(fd) + + if err := syscall.BindToDevice(fd, iface.Name); err != nil { + return fmt.Errorf("failed to bind to device: %v", err) + } + + ll := syscall.SockaddrLinklayer{ + Protocol: htons(syscall.ETH_P_ARP), + Ifindex: iface.Index, + Pkttype: 0, // syscall.PACKET_HOST + Hatype: m.hardwareType, + Halen: m.hardwareAddressLength, + } + target := ethernetBroadcast + for i := 0; i < len(target); i++ { + ll.Addr[i] = target[i] + } + + b, err := m.bytes() + if err != nil { + return fmt.Errorf("failed to convert ARP message: %v", err) + } + + if err := syscall.Bind(fd, &ll); err != nil { + return fmt.Errorf("failed to bind: %v", err) + } + if err := syscall.Sendto(fd, b, 0, &ll); err != nil { + return fmt.Errorf("failed to send: %v", err) + } + + return nil +} + +// ARPSendGratuitous sends a gratuitous ARP message via the specified interface. +func ARPSendGratuitous(cidr, iface string) error { + i, err := net.InterfaceByName(iface) + if err != nil { + return fmt.Errorf("failed to get interface %q: %v", iface, err) + } + ip, _, err := net.ParseCIDR(cidr) + if err != nil { + return fmt.Errorf("failed to parse cidr: %s", cidr) + } + + //log.Infof("Broadcasting ARP update for %s (%s) via %s", address, iface.HardwareAddr, iface.Name) + m, err := gratuitousARP(ip, i.HardwareAddr) + if err != nil { + return err + } + return sendARP(i, m) +} diff --git a/pkg/vip/arp_linux2.go b/pkg/vip/arp_linux2.go new file mode 100644 index 0000000..e993e01 --- /dev/null +++ b/pkg/vip/arp_linux2.go @@ -0,0 +1,38 @@ +package vip + +import ( + "fmt" + "net" + + "github.com/mdlayher/arp" + "github.com/mdlayher/ethernet" +) + +func sendARP(ip net.IP, iface *net.Interface) error { + c, err := arp.Dial(iface) + if err != nil { + return err + } + for _, op := range []arp.Operation{arp.OperationRequest, arp.OperationReply} { + pkt, err := arp.NewPacket(op, iface.HardwareAddr, ip, ethernet.Broadcast, ip) + if err != nil { + return fmt.Errorf("assembling %q gratuitous packet for %q: %s", op, ip, err) + } + if err = c.WriteTo(pkt, ethernet.Broadcast); err != nil { + return fmt.Errorf("writing %q gratuitous packet for %q: %s", op, ip, err) + } + } + return nil +} + +func ARPSendGratuitous(cidr, iface string) error { + i, err := net.InterfaceByName(iface) + if err != nil { + return fmt.Errorf("failed to get interface %q: %v", iface, err) + } + ip, _, err := net.ParseCIDR(cidr) + if err != nil { + return fmt.Errorf("failed to parse cidr: %s", cidr) + } + return sendARP(ip, i) +} diff --git a/pkg/vip/vip.go b/pkg/vip/vip.go new file mode 100644 index 0000000..ee1a639 --- /dev/null +++ b/pkg/vip/vip.go @@ -0,0 +1,96 @@ +package vip + +import ( + "errors" + "github.com/vishvananda/netlink" + "net" +) + +var ErrNoDefaultInterface = errors.New("no default interface found") + +func DefaultInterface() (iface string, err error) { + routes, err := netlink.RouteGet(net.IPv4bcast) + if err != nil { + return + } + if len(routes) >= 1 { + link, err := netlink.LinkByIndex(routes[0].LinkIndex) + if err != nil { + return "", err + } + return link.Attrs().Name, nil + } + err = ErrNoDefaultInterface + return +} + +type Network struct { + iface string + label string + link netlink.Link +} + +func NewNetwork(iface string) (n *Network, err error) { + return NewNetworkWithLabel(iface, "") +} + +func NewNetworkWithLabel(iface, label string) (n *Network, err error) { + if iface == "" { + iface, err = DefaultInterface() + if err != nil { + return + } + } + link, err := netlink.LinkByName(iface) + if err != nil { + return + } + n = &Network{iface, label, link} + return +} + +func (n *Network) Interface() string { + return n.iface +} + +func (n *Network) HasIP(a *netlink.Addr) bool { + addrs, err := netlink.AddrList(n.link, 0) + if err != nil { + return false + } + for _, addr := range addrs { + if addr.Equal(*a) { + return true + } + } + return false +} + +func (n *Network) AddIP(cidr string) error { + addr, err := netlink.ParseAddr(cidr) + if err != nil { + return err + } + if n.HasIP(addr) { + return nil + } + if n.label != "" { + addr.Label = n.iface + ":" + n.label + } + err = netlink.AddrReplace(n.link, addr) + if err != nil { + return err + } + return ARPSendGratuitous(cidr, n.iface) +} + +func (n *Network) DeleteIP(cidr string) error { + addr, err := netlink.ParseAddr(cidr) + if err != nil { + return err + } + if !n.HasIP(addr) { + return nil + } + return netlink.AddrDel(n.link, addr) +} diff --git a/run_etcd.sh b/run_etcd.sh new file mode 100755 index 0000000..ab75ec7 --- /dev/null +++ b/run_etcd.sh @@ -0,0 +1,6 @@ +#!/bin/sh + +cd data +../vipman -config etcd.yaml & +../vipman -config etcd.yaml & +../vipman -config etcd.yaml diff --git a/run_raft.sh b/run_raft.sh new file mode 100755 index 0000000..d218498 --- /dev/null +++ b/run_raft.sh @@ -0,0 +1,7 @@ +#!/bin/sh + +cd data +rm -rf node* +../vipman -config raft1.yaml & +../vipman -config raft2.yaml & +../vipman -config raft3.yaml