482 lines
12 KiB
Go
482 lines
12 KiB
Go
package instance
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import "encoding/json"
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import "fmt"
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import "io/ioutil"
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import "net/http"
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import "strings"
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import "sync"
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import "time"
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import "errors"
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//import "github.com/gin-gonic/gin"
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import "github.com/looplab/fsm"
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import "github.com/rs/zerolog/log"
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import "github.com/sneak/feta/storage"
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import "github.com/sneak/feta/toot"
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import "github.com/sneak/feta/jsonapis"
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const nodeInfoSchemaVersionTwoName = "http://nodeinfo.diaspora.software/ns/schema/2.0"
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const instanceNodeinfoTimeout = time.Second * 50
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const instanceHTTPTimeout = time.Second * 120
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const instanceSpiderInterval = time.Second * 120
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const instanceErrorInterval = time.Second * 60 * 30
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type instanceImplementation int
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// Hostname is a special type for holding the hostname of an
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// instance (string)
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type Hostname string
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const (
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implUnknown instanceImplementation = iota
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implMastodon
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implPleroma
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)
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// Instance stores all the information we know about an instance
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type Instance struct {
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structLock sync.Mutex
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tootDestination chan *toot.Toot
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ErrorCount uint
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SuccessCount uint
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highestID int
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Hostname string
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Identified bool
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fetching bool
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implementation instanceImplementation
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storageBackend *storage.TootStorageBackend
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NextFetch time.Time
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nodeInfoURL string
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ServerVersionString string
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ServerImplementationString string
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fetchingLock sync.Mutex
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fsm *fsm.FSM
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fsmLock sync.Mutex
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}
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// New returns a new instance, argument is a function that operates on the
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// new instance
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func New(options ...func(i *Instance)) *Instance {
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i := new(Instance)
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i.setNextFetchAfter(1 * time.Second)
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i.fsm = fsm.NewFSM(
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"STATUS_UNKNOWN",
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fsm.Events{
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{Name: "BEGIN_NODEINFO_URL_FETCH", Src: []string{"STATUS_UNKNOWN"}, Dst: "FETCHING_NODEINFO_URL"},
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{Name: "GOT_NODEINFO_URL", Src: []string{"FETCHING_NODEINFO_URL"}, Dst: "PRE_NODEINFO_FETCH"},
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{Name: "BEGIN_NODEINFO_FETCH", Src: []string{"PRE_NODEINFO_FETCH"}, Dst: "FETCHING_NODEINFO"},
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{Name: "GOT_NODEINFO", Src: []string{"FETCHING_NODEINFO"}, Dst: "READY_FOR_TOOTFETCH"},
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{Name: "FETCH_TIME_REACHED", Src: []string{"READY_FOR_TOOTFETCH"}, Dst: "READY_AND_DUE_FETCH"},
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{Name: "BEGIN_TOOT_FETCH", Src: []string{"READY_AND_DUE_FETCH"}, Dst: "FETCHING"},
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{Name: "WEIRD_NODE_RESPONSE", Src: []string{"FETCHING_NODEINFO_URL", "PRE_NODEINFO_FETCH", "FETCHING_NODEINFO"}, Dst: "WEIRD_NODE"},
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{Name: "EARLY_FETCH_ERROR", Src: []string{"FETCHING_NODEINFO_URL", "PRE_NODEINFO_FETCH", "FETCHING_NODEINFO"}, Dst: "EARLY_ERROR"},
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{Name: "TOOT_FETCH_ERROR", Src: []string{"FETCHING"}, Dst: "TOOT_FETCH_ERROR"},
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{Name: "TOOTS_FETCHED", Src: []string{"FETCHING"}, Dst: "READY_FOR_TOOTFETCH"},
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},
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fsm.Callbacks{
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"enter_state": func(e *fsm.Event) { i.fsmEnterState(e) },
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},
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)
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for _, opt := range options {
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opt(i)
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}
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return i
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}
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// Status returns the instance's state in the FSM
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func (i *Instance) Status() string {
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i.fsmLock.Lock()
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defer i.fsmLock.Unlock()
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return i.fsm.Current()
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}
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// SetTootDestination takes a channel from the manager that all toots
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// fetched from this instance should be pushed into. The instance is not
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// responsible for deduplication, it should shove all toots on every fetch
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// into the channel.
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func (i *Instance) SetTootDestination(d chan *toot.Toot) {
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i.tootDestination = d
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}
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// Event is the method that alters the FSM
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func (i *Instance) Event(eventname string) {
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i.fsmLock.Lock()
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defer i.fsmLock.Unlock()
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i.fsm.Event(eventname)
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}
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func (i *Instance) fsmEnterState(e *fsm.Event) {
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log.Debug().
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Str("hostname", i.Hostname).
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Str("state", e.Dst).
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Msg("instance changed state")
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}
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// Lock locks the instance's mutex for reading/writing from the structure
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func (i *Instance) Lock() {
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i.structLock.Lock()
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}
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// Unlock unlocks the instance's mutex for reading/writing from the structure
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func (i *Instance) Unlock() {
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i.structLock.Unlock()
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}
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func (i *Instance) bumpFetch() {
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i.Lock()
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defer i.Unlock()
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i.NextFetch = time.Now().Add(120 * time.Second)
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}
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func (i *Instance) setNextFetchAfter(d time.Duration) {
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i.Lock()
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defer i.Unlock()
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i.NextFetch = time.Now().Add(d)
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}
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// Fetch prepares an instance for fetching. Bad name, fix it.
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// FIXME(sneak)
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func (i *Instance) Fetch() {
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i.fetchingLock.Lock()
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defer i.fetchingLock.Unlock()
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i.setNextFetchAfter(instanceErrorInterval)
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err := i.DetectNodeTypeIfNecessary()
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msg("unable to fetch instance metadata")
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return
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}
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i.setNextFetchAfter(instanceSpiderInterval)
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log.Info().
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Str("hostname", i.Hostname).
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Msg("instance now ready for fetch")
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}
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// FIXME rename this function
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func (i *Instance) dueForFetch() bool {
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// this just checks FSM state, the ticker must update it and do time
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// calcs
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if i.Status() == "READY_AND_DUE_FETCH" {
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return true
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}
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return false
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}
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func (i *Instance) isNowPastFetchTime() bool {
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return time.Now().After(i.NextFetch)
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}
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// Tick is responsible for pushing idle instance records between states.
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// The instances will transition between states when doing stuff (e.g.
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// investigating, fetching, et c) as well.
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func (i *Instance) Tick() {
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if i.Status() == "READY_FOR_TOOTFETCH" {
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if i.isNowPastFetchTime() {
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i.Event("FETCH_TIME_REACHED")
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}
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} else if i.Status() == "STATUS_UNKNOWN" {
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i.Fetch()
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} else if i.Status() == "READY_AND_DUE_FETCH" {
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i.fetchRecentToots()
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}
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}
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func (i *Instance) nodeIdentified() bool {
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i.Lock()
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defer i.Unlock()
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if i.implementation > implUnknown {
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return true
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}
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return false
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}
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// DetectNodeTypeIfNecessary does some network requests if the node is as
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// yet unidenfitied. No-op otherwise.
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func (i *Instance) DetectNodeTypeIfNecessary() error {
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if !i.nodeIdentified() {
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return i.fetchNodeInfo()
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}
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return nil
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}
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func (i *Instance) registerError() {
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i.Lock()
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defer i.Unlock()
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i.ErrorCount++
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}
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func (i *Instance) registerSuccess() {
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i.Lock()
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defer i.Unlock()
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i.SuccessCount++
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}
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// Up returns true if the success count is >0
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func (i *Instance) Up() bool {
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i.Lock()
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defer i.Unlock()
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return i.SuccessCount > 0
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}
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func (i *Instance) fetchNodeInfoURL() error {
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url := fmt.Sprintf("https://%s/.well-known/nodeinfo", i.Hostname)
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var c = &http.Client{
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Timeout: instanceNodeinfoTimeout,
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}
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log.Debug().
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Str("url", url).
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Str("hostname", i.Hostname).
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Msg("fetching nodeinfo reference URL")
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i.Event("BEGIN_NODEINFO_URL_FETCH")
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resp, err := c.Get(url)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msg("unable to fetch nodeinfo, node is down?")
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i.registerError()
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i.Event("EARLY_FETCH_ERROR")
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return err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msg("unable to read nodeinfo")
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i.registerError()
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i.Event("EARLY_FETCH_ERROR")
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return err
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}
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nir := new(jsonapis.NodeInfoWellKnownResponse)
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err = json.Unmarshal(body, &nir)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msg("unable to parse nodeinfo, node is weird")
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i.registerError()
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i.Event("WEIRD_NODE_RESPONSE")
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return err
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}
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for _, item := range nir.Links {
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if item.Rel == nodeInfoSchemaVersionTwoName {
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log.Debug().
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Str("hostname", i.Hostname).
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Str("nodeinfourl", item.Href).
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Msg("success fetching url for nodeinfo")
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i.Lock()
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i.nodeInfoURL = item.Href
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i.Unlock()
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i.registerSuccess()
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i.Event("GOT_NODEINFO_URL")
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return nil
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}
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log.Debug().
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Str("hostname", i.Hostname).
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Str("item-rel", item.Rel).
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Str("item-href", item.Href).
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Msg("nodeinfo entry")
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}
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log.Error().
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Str("hostname", i.Hostname).
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Msg("incomplete nodeinfo")
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i.registerError()
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i.Event("WEIRD_NODE_RESPONSE")
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return errors.New("incomplete nodeinfo")
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}
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func (i *Instance) fetchNodeInfo() error {
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err := i.fetchNodeInfoURL()
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if err != nil {
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return err
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}
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var c = &http.Client{
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Timeout: instanceNodeinfoTimeout,
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}
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//FIXME make sure the nodeinfourl is on the same domain as the instance
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//hostname
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i.Lock()
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url := i.nodeInfoURL
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i.Unlock()
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i.Event("BEGIN_NODEINFO_FETCH")
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resp, err := c.Get(url)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to fetch nodeinfo data")
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i.registerError()
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i.Event("EARLY_FETCH_ERROR")
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return err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Error().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to read nodeinfo data")
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i.registerError()
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i.Event("EARLY_FETCH_ERROR")
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return err
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}
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ni := new(jsonapis.NodeInfoVersionTwoSchema)
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err = json.Unmarshal(body, &ni)
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if err != nil {
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log.Error().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to parse nodeinfo")
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i.registerError()
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i.Event("WEIRD_NODE_RESPONSE")
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return err
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}
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log.Debug().
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Str("serverVersion", ni.Software.Version).
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Str("software", ni.Software.Name).
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Str("hostname", i.Hostname).
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Str("nodeInfoURL", i.nodeInfoURL).
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Msg("received nodeinfo from instance")
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i.Lock()
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i.ServerVersionString = ni.Software.Version
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i.ServerImplementationString = ni.Software.Name
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ni.Software.Name = strings.ToLower(ni.Software.Name)
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if ni.Software.Name == "pleroma" {
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log.Debug().
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Str("hostname", i.Hostname).
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Str("software", ni.Software.Name).
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Msg("detected server software")
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i.Identified = true
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i.implementation = implPleroma
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i.Unlock()
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i.registerSuccess()
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i.Event("GOT_NODEINFO")
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return nil
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} else if ni.Software.Name == "mastodon" {
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log.Debug().
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Str("hostname", i.Hostname).
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Str("software", ni.Software.Name).
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Msg("detected server software")
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i.Identified = true
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i.implementation = implMastodon
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i.Unlock()
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i.registerSuccess()
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i.Event("GOT_NODEINFO")
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return nil
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} else {
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log.Error().
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Str("hostname", i.Hostname).
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Str("software", ni.Software.Name).
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Msg("FIXME unknown server implementation")
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i.Unlock()
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i.registerError()
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i.Event("WEIRD_NODE_RESPONSE")
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return errors.New("unknown server implementation")
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}
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}
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func (i *Instance) fetchRecentToots() error {
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// this would have been about a billion times shorter in python
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// it turns out pleroma supports the mastodon api so we'll just use that
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// for everything for now
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url := fmt.Sprintf("https://%s/api/v1/timelines/public?limit=40&local=true",
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i.Hostname)
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var c = &http.Client{
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Timeout: instanceHTTPTimeout,
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}
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i.Event("BEGIN_TOOT_FETCH")
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// we set the interval now to the error interval regardless here as a
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// safety against bugs to avoid fetching too frequently by logic
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// bug. if the fetch is successful, we will conditionally re-update the
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// next fetch to now+successInterval.
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i.setNextFetchAfter(instanceErrorInterval)
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resp, err := c.Get(url)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to fetch recent toots")
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i.registerError()
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i.Event("TOOT_FETCH_ERROR")
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return err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Debug().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to read recent toots from response")
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i.registerError()
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i.Event("TOOT_FETCH_ERROR")
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return err
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}
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tc, err := toot.NewTootCollectionFromMastodonAPIResponse(body, i.Hostname)
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if err != nil {
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log.Error().
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Str("hostname", i.Hostname).
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Err(err).
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Msgf("unable to parse recent toot list")
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i.registerError()
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i.Event("TOOT_FETCH_ERROR")
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return err
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}
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log.Info().
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Str("hostname", i.Hostname).
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Int("tootCount", len(tc)).
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Msgf("got and parsed toots")
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i.registerSuccess()
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i.Event("TOOTS_FETCHED")
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i.setNextFetchAfter(instanceSpiderInterval)
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// this should go fast as either the channel is buffered bigly or the
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// ingester receives fast and does its own buffering, but run it in its
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// own goroutine anyway because why not
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go i.sendTootsToIngester(tc)
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return nil
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}
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func (i *Instance) sendTootsToIngester(tc []*toot.Toot) {
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for _, item := range tc {
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i.tootDestination <- item
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}
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}
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