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pmu.go
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pmu.go
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package main
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"net"
"sync"
"time"
)
const QueueSize = 16000
const MaxBatch = 1000
type PMU struct {
ctx context.Context
ctxcancel func()
address string
id uint16
nickname string
conn *net.TCPConn
br *bufio.Reader
currentconfig *Config12Frame
cfgmu sync.Mutex
cfgs map[uint16]*Config12Frame
outputmu sync.RWMutex
output map[uint16]chan *DataFrame
}
func CreatePMU(address string, id uint16) *PMU {
rv := &PMU{
address: address,
nickname: fmt.Sprintf("%d@%s", id, address),
id: id,
cfgs: make(map[uint16]*Config12Frame),
output: make(map[uint16]chan *DataFrame),
}
go rv.dialloop()
return rv
}
func (p *PMU) dialloop() {
for {
fmt.Printf("[%s] beginning dial\n", p.nickname)
err := p.dial()
fmt.Printf("[%s] fatal error: %v\n", p.nickname, err)
time.Sleep(10 * time.Second)
fmt.Printf("[%s] backoff over, reconnecting\n", p.nickname)
}
}
func (p *PMU) dial() (err error) {
defer func() {
r := recover()
if r != nil {
err = fmt.Errorf("[%s] panic: %v", p.nickname, r)
}
}()
p.ctx, p.ctxcancel = context.WithCancel(context.Background())
addr, err := net.ResolveTCPAddr("tcp", p.address)
if err != nil {
return err
}
conn, err := net.DialTCP("tcp", nil, addr)
if err != nil {
return err
}
fmt.Printf("[%s] dial succeeded\n", p.nickname)
p.conn = conn
p.br = bufio.NewReader(p.conn)
p.initialConfigure()
return p.process()
}
func (p *PMU) process() error {
for {
ch, frame, err := p.readFrame()
if err != nil {
fmt.Printf("[%s] frame read error: %v\n", p.nickname, err)
p.conn.Close()
return err
}
_ = ch
cfg, ok := frame.(*Config12Frame)
if ok {
p.cfgmu.Lock()
p.cfgs[ch.IDCODE] = cfg
p.cfgmu.Unlock()
}
dat, ok := frame.(*DataFrame)
if ok {
p.outputmu.RLock()
ochan, ok := p.output[dat.IDCODE]
p.outputmu.RUnlock()
if !ok {
p.outputmu.Lock()
ochan = make(chan *DataFrame, QueueSize)
p.output[dat.IDCODE] = ochan
p.outputmu.Unlock()
}
select {
case ochan <- dat:
default:
fmt.Printf("[%s] WARNING QUEUE OVERFLOW. DROPPING DATA FROM %d\n", p.nickname, dat.IDCODE)
}
}
}
}
func (p *PMU) GetBatch() (map[uint16][]*DataFrame, bool) {
fulldrain := true
chanz := make(map[uint16]chan *DataFrame)
rv := make(map[uint16][]*DataFrame)
p.outputmu.RLock()
for k, v := range p.output {
chanz[k] = v
}
p.outputmu.RUnlock()
for idcode, ch := range chanz {
slice := make([]*DataFrame, 0, MaxBatch)
drained := false
batchloop:
for i := 0; i < MaxBatch; i++ {
select {
case d := <-ch:
slice = append(slice, d)
default:
drained = true
break batchloop
}
}
if !drained {
fulldrain = false
}
rv[idcode] = slice
}
return rv, fulldrain
}
func (p *PMU) initialConfigure() {
time.Sleep(1 * time.Second)
c := &CommandFrame{}
c.IDCODE = p.id
c.SetSOCToNow()
c.SetSyncType(SYNC_TYPE_CMD)
c.FRAMESIZE = CommonHeaderLength + 4
c.CMD = uint16(CMD_SEND_CFG1)
err := WriteChecksummedFrame(c, p.conn)
if err != nil {
panic(err)
}
}
func (p *PMU) ConfigFor(idcode uint16) (*Config12Frame, error) {
p.cfgmu.Lock()
cfg, ok := p.cfgs[idcode]
p.cfgmu.Unlock()
if !ok {
return nil, fmt.Errorf("No config found")
}
return cfg, nil
}
func (p *PMU) readFrame() (*CommonHeader, Frame, error) {
r := p.br
initialByte, err := r.ReadByte()
if err != nil {
return nil, nil, err
}
skipped := 0
for initialByte != 0xAA {
skipped++
initialByte, err = r.ReadByte()
}
if skipped != 0 {
fmt.Printf("[%s] SYNC LOSS DETECTED, SKIPPED %d BYTES RESYNCING\n", p.nickname, skipped)
}
raw := make([]byte, CommonHeaderLength)
nread, err := io.ReadFull(r, raw[1:])
if err != nil {
return nil, nil, err
}
if nread != len(raw[1:]) {
fmt.Printf("READ LEN MISMATCH %d vs %d\n", nread, len(raw[1:]))
}
raw[0] = initialByte
rcopy := make([]byte, CommonHeaderLength)
copy(rcopy, raw)
ch, err := ReadCommonHeader(bytes.NewBuffer(rcopy))
if err != nil {
return nil, nil, err
}
rest := make([]byte, int(ch.FRAMESIZE)-CommonHeaderLength)
_, err = io.ReadFull(r, rest)
if err != nil {
return nil, nil, err
}
raw = append(raw, rest[:len(rest)-2]...)
realchk := Checksum(raw)
expectedchk := (int(rest[len(rest)-2]) << 8) + int(rest[len(rest)-1])
if expectedchk != int(realchk) {
fmt.Printf("[%s] frame checksum failure type=%d, got=%x expected=%x\n", p.nickname, ch.SyncType(), realchk, expectedchk)
//the spec says silently ignore frames with bad checksums
return ch, nil, nil
}
if ch.SyncType() == SYNC_TYPE_CFG2 {
cfg2, err := ReadConfig12Frame(ch, bytes.NewBuffer(rest))
if err != nil {
return nil, nil, err
}
return ch, cfg2, nil
}
if ch.SyncType() == SYNC_TYPE_DATA {
cfg, _ := p.ConfigFor(ch.IDCODE)
if cfg == nil {
fmt.Printf("[%s] dropping data frame: no config\n", p.nickname)
return ch, nil, nil
}
dat, err := ReadDataFrame(ch, cfg, bytes.NewBuffer(rest))
if err != nil {
return nil, nil, err
}
return ch, dat, nil
}
if ch.SyncType() == SYNC_TYPE_CFG1 {
cfg1, err := ReadConfig12Frame(ch, bytes.NewBuffer(rest))
if err != nil {
return nil, nil, err
}
return ch, cfg1, nil
}
if ch.SyncType() == SYNC_TYPE_CFG3 {
fmt.Printf("[%s] WARN got CFG3 which is not supported\n", p.nickname)
return ch, nil, nil
}
return ch, nil, fmt.Errorf("Unknown frame type")
}