@@ -0,0 +1,1 @@ 
+,*

@@ -0,0 +1,6 @@ 
+               cascade
+             -----------
+
+    cascade is a cli-based fully
+    masterless distributed computing
+    thing

@@ -0,0 +1,135 @@ 
+package main
+
+import (
+	"log"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/hashicorp/memberlist"
+	"github.com/hashicorp/serf/serf"
+)
+
+// Agent starts and manages a Serf & adds
+// service discovery
+type Agent struct {
+	conf     *Config
+	serfConf *serf.Config
+	eventCh  chan serf.Event
+
+	// i doubt we care about handling events,
+	// but i'm leaving this here just in case
+	//	eventHandlerList  []EventHandler
+	//	eventHandlersLock sync.Mutex
+
+	// This is the underlying Serf we are wrapping
+	serf *serf.Serf
+
+	// this channel receiving a signal = shutdown
+	shutdown bool
+	shutdownCh chan struct{}
+	shutdownLock sync.Mutex
+}
+
+func Create(conf *Config, serfConf *serf.Config) (*Agent) {
+	// Create a channel to listen for events from Serf
+	eventCh := make(chan serf.Event, 64)
+	serfConf.EventCh = eventCh
+
+	// Setup the agent
+	agent := &Agent{
+		conf:     conf,
+		serfConf:          serfConf,
+		eventCh:       eventCh,
+		shutdownCh:    make(chan struct{}),
+	}
+
+	return agent
+}
+
+// setupAgent calls Create
+func SetupAgent(config *Config) *Agent {
+	bindIP, bindPort, err := config.AddrParts(config.BindAddr)
+	if err != nil {
+		log.Panic(err)
+	}
+
+	serfConfig := serf.DefaultConfig()
+	if os.Getenv("CASCADE_BIND") != "" {
+		config.BindAddr = os.Getenv("CASCADE_BIND")
+	}
+	serfConfig.MemberlistConfig.BindAddr = bindIP
+	serfConfig.MemberlistConfig.BindPort = bindPort
+	serfConfig.MemberlistConfig.AdvertiseAddr = ""
+	serfConfig.MemberlistConfig.AdvertisePort = 0
+	serfConfig.ProtocolVersion = uint8(serf.ProtocolVersionMax)
+	serfConfig.CoalescePeriod = 3 * time.Second
+	serfConfig.QuiescentPeriod = time.Second
+	serfConfig.QueryResponseSizeLimit = 1024
+	serfConfig.QuerySizeLimit = 1024
+	serfConfig.UserEventSizeLimit = 512
+	serfConfig.UserCoalescePeriod = 3 * time.Second
+	serfConfig.UserQuiescentPeriod = time.Second
+	// TODO: look at reconnect/tombstone settings w more scrutiny
+	serfConfig.ReconnectInterval = 0
+	serfConfig.ReconnectTimeout = 0
+	serfConfig.TombstoneTimeout = 0
+	serfConfig.BroadcastTimeout = 0
+	// TODO: what are the implications of true here o_O
+	serfConfig.EnableNameConflictResolution = true
+
+
+	// hardcode DefaultWANConfig because cascade is designed to be
+	// used as a single global system.
+	serfConfig.MemberlistConfig = memberlist.DefaultWANConfig()
+	serfConfig.MemberlistConfig.BindAddr = bindIP
+	serfConfig.MemberlistConfig.BindPort = bindPort
+
+	agent := Create(config, serfConfig)
+
+	return agent
+}
+
+func (a *Agent) eventLoop() {
+	serfShutdownCh := a.serf.ShutdownCh()
+	for {
+		select {
+		case e := <-a.eventCh:
+			log.Printf("[INFO] agent: Received event: %s", e.String())
+
+		case <-serfShutdownCh:
+			log.Printf("[WARN] agent: Serf shutdown detected, quitting")
+			a.Shutdown()
+			return
+
+		case <-a.shutdownCh:
+			return
+		}
+	}
+}
+
+// Shutdown closes this agent and all of its processes. Should be preceded
+// by a Leave for a graceful shutdown.
+func (a *Agent) Shutdown() error {
+	a.shutdownLock.Lock()
+	defer a.shutdownLock.Unlock()
+
+	if a.shutdown {
+		return nil
+	}
+
+	if a.serf == nil {
+		goto EXIT
+	}
+
+	log.Println("[INFO] agent: requesting serf shutdown")
+	if err := a.serf.Shutdown(); err != nil {
+		return err
+	}
+
+EXIT:
+	log.Println("[INFO] agent: shutdown complete")
+	a.shutdown = true
+	close(a.shutdownCh)
+	return nil
+}

@@ -0,0 +1,53 @@ 
+package main
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/hashicorp/serf/serf"
+)
+
+const DefaultBindPort int = 4449
+
+func DefaultConfig() *Config {
+	return &Config{
+		BindAddr: "0.0.0.0",
+	}
+}
+
+// Services are built on top of serf
+// tags. The tag format under the hood
+// is service=name=<name>,port=<port>
+type Service struct {
+	name string
+	port int
+}
+
+type Config struct {
+	BindAddr string
+	Services []Service
+	SerfConf *serf.Config
+}
+
+// lifted from serf, could be simplified
+func (c *Config) AddrParts(address string) (string, int, error) {
+	checkAddr := address
+
+START:
+	_, _, err := net.SplitHostPort(checkAddr)
+	if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
+		checkAddr = fmt.Sprintf("%s:%d", checkAddr, DefaultBindPort)
+		goto START
+	}
+	if err != nil {
+		return "", 0, err
+	}
+
+	// Get the address
+	addr, err := net.ResolveTCPAddr("tcp", checkAddr)
+	if err != nil {
+		return "", 0, err
+	}
+
+	return addr.IP.String(), addr.Port, nil
+}

@@ -0,0 +1,21 @@ 
+module git.j3s.sh/cascade
+
+go 1.20
+
+require github.com/hashicorp/serf v0.10.1
+
+require (
+	github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da // indirect
+	github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-immutable-radix v1.0.0 // indirect
+	github.com/hashicorp/go-msgpack v0.5.3 // indirect
+	github.com/hashicorp/go-multierror v1.1.0 // indirect
+	github.com/hashicorp/go-sockaddr v1.0.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.0 // indirect
+	github.com/hashicorp/memberlist v0.5.0 // indirect
+	github.com/miekg/dns v1.1.41 // indirect
+	github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 // indirect
+	golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1 // indirect
+	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
+)

@@ -0,0 +1,89 @@ 
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+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

@@ -0,0 +1,18 @@ 
+// design touchstones
+//   configured entirely via environment variables
+//   minimal configurable options
+//   a single global cluster
+//   easy cluster formation
+// todo
+//   dns resolver for services
+
+package main
+
+import "log"
+
+func main() {
+	// agent does everything tbh
+	agent := SetupAgent(DefaultConfig())
+	log.Println(agent)
+//	agent.Run()
+}