feta/instance.go

237 lines
5.4 KiB
Go

package main
import (
"encoding/json"
"fmt"
"github.com/rs/zerolog/log"
"net/http"
"strings"
"time"
)
const NodeInfoSchemaVersionTwoName = "http://nodeinfo.diaspora.software/ns/schema/2.0"
const NODE_TIMEOUT = time.Second * 30
type ServerImplementation int
const (
ServerUnknown ServerImplementation = iota
ServerMastodon
ServerPleroma
)
type Instance struct {
errorCount uint
highestId int
hostName string
impl ServerImplementation
lastFailure *time.Time
lastSuccess *time.Time
nodeInfoUrl string
serverVersion string
identified bool
up bool
shouldSkip bool
}
func NewInstance(hostname string) *Instance {
i := new(Instance)
i.hostName = hostname
foreverago := time.Now().Add((-1 * 86400 * 365 * 100) * time.Second)
i.lastSuccess = &foreverago
i.lastFailure = &foreverago
i.identified = false
i.up = false
go func() {
i.detectNodeType()
}()
return i
}
func (i *Instance) detectNodeType() {
if i.impl > ServerUnknown {
return
}
i.fetchNodeInfo()
}
type NodeInfoWellKnownResponse struct {
Links []struct {
Rel string `json:"rel"`
Href string `json:"href"`
} `json:"links"`
}
type NodeInfoVersionTwoSchema struct {
Version string `json:"version"`
Software struct {
Name string `json:"name"`
Version string `json:"version"`
} `json:"software"`
Protocols []string `json:"protocols"`
Usage struct {
Users struct {
Total int `json:"total"`
ActiveMonth int `json:"activeMonth"`
ActiveHalfyear int `json:"activeHalfyear"`
} `json:"users"`
LocalPosts int `json:"localPosts"`
} `json:"usage"`
OpenRegistrations bool `json:"openRegistrations"`
}
func (i *Instance) registerError() {
i.errorCount = i.errorCount + 1
t := time.Now()
i.lastFailure = &t
}
func (i *Instance) registerSuccess() {
t := time.Now()
i.lastSuccess = &t
}
func (i *Instance) fetchNodeInfoURL() {
url := fmt.Sprintf("https://%s/.well-known/nodeinfo", i.hostName)
var c = &http.Client{
Timeout: NODE_TIMEOUT,
}
log.Debug().
Str("url", url).
Str("hostname", i.hostName).
Msg("fetching nodeinfo reference URL")
resp, err := c.Get(url)
if err != nil {
log.Error().
Str("hostname", i.hostName).
Msg("unable to fetch nodeinfo, node is down?")
i.registerError()
} else {
i.up = true // node is alive and responding to us
nir := new(NodeInfoWellKnownResponse)
err = json.NewDecoder(resp.Body).Decode(&nir)
if err != nil {
log.Error().
Str("hostname", i.hostName).
Msg("unable to parse nodeinfo")
i.registerError()
return
}
for _, item := range nir.Links {
if item.Rel == NodeInfoSchemaVersionTwoName {
log.Info().
Str("hostname", i.hostName).
Str("nodeinfourl", item.Href).
Msg("success fetching url for nodeinfo")
i.nodeInfoUrl = item.Href
i.registerSuccess()
return
}
}
log.Error().
Str("hostname", i.hostName).
Msg("incomplete nodeinfo")
i.registerError()
return
}
}
func (i *Instance) fetchNodeInfo() {
i.fetchNodeInfoURL()
if i.nodeInfoUrl == "" {
log.Error().
Str("hostname", i.hostName).
Msg("unable to fetch nodeinfo as nodeinfo URL cannot be determined")
return
}
var c = &http.Client{
Timeout: NODE_TIMEOUT,
}
//FIXME make sure the nodeinfourl is on the same domain as the instance
//hostname
resp, err := c.Get(i.nodeInfoUrl)
if err != nil {
log.Error().
Str("hostname", i.hostName).
Msgf("unable to fetch nodeinfo data: %s", err)
i.registerError()
} else {
ni := new(NodeInfoVersionTwoSchema)
err = json.NewDecoder(resp.Body).Decode(&ni)
if err != nil {
log.Error().
Str("hostname", i.hostName).
Msgf("unable to parse nodeinfo: %s", err)
i.registerError()
return
}
log.Info().
Str("serverVersion", ni.Software.Version).
Str("software", ni.Software.Name).
Str("hostName", i.hostName).
Str("nodeInfoUrl", i.nodeInfoUrl).
Msg("received nodeinfo from instance")
i.serverVersion = ni.Software.Version
ni.Software.Name = strings.ToLower(ni.Software.Name)
if ni.Software.Name == "pleroma" {
log.Info().
Str("hostname", i.hostName).
Str("software", ni.Software.Name).
Msg("detected server software")
i.registerSuccess()
i.identified = true
i.impl = ServerPleroma
} else if ni.Software.Name == "mastodon" {
log.Info().
Str("hostname", i.hostName).
Str("software", ni.Software.Name).
Msg("detected server software")
i.registerSuccess()
i.identified = true
i.impl = ServerMastodon
} else {
log.Error().
Str("hostname", i.hostName).
Str("software", ni.Software.Name).
Msg("unknown implementation on server")
i.registerError()
}
return
}
}
func (i *Instance) fetchRecentToots() ([]byte, error) {
if i.impl == ServerMastodon {
return i.fetchRecentTootsJsonFromMastodon()
} else if i.impl == ServerPleroma {
return i.fetchRecentTootsJsonFromPleroma()
} else {
panic("nope")
}
}
func (i *Instance) fetchRecentTootsJsonFromPleroma() ([]byte, error) {
//url := fmt.Sprintf("https://%s/api/statuses/public_and_external_timeline.json?count=100", i.hostName)
return nil, nil
}
func (i *Instance) fetchRecentTootsJsonFromMastodon() ([]byte, error) {
//url := fmt.Sprintf("https://%s/api/v1/timelines/public?limit=40&local=true", i.hostName)
return nil, nil
}
func fetchLatestToots(lastId int) {
log.Debug().Msg("This message appears only when log level set to Debug")
log.Info().Msg("This message appears when log level set to Debug or Info")
}