author | Mikael Berthe <mikael@lilotux.net> |
Sun, 19 Feb 2017 00:01:09 +0100 | |
changeset 2 | 2452d9b23ec1 |
parent 1 | 05b31eb60d27 |
child 3 | 429d7e612cfd |
permissions | -rw-r--r-- |
0 | 1 |
package main |
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import ( |
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"encoding/json" |
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"fmt" |
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"io" |
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"io/ioutil" |
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"log" |
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flag "github.com/docker/docker/pkg/mflag" |
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"github.com/tarm/serial" |
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) |
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type measurement struct { |
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Header int |
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Systolic int |
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Diastolic int |
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Pulse int |
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Month int |
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Day int |
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Hour int |
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Minute int |
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Year int |
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} |
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func getData(s io.ReadWriteCloser, buf []byte, size int) (int, error) { |
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t := 0 |
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b := buf |
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for t < size { |
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n, err := s.Read(b[t:]) |
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if err != nil { |
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log.Fatal(err) // XXX |
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return t, err |
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} |
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//log.Printf("(%d bytes) %q\n", n, b[t:t+1]) |
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t = t + n |
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} |
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return t, nil |
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} |
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func fetchData(dev string) (items []measurement, err error) { |
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c := &serial.Config{Name: dev, Baud: 4800} |
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var s *serial.Port |
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s, err = serial.OpenPort(c) |
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if err != nil { |
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return items, err |
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} |
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// =================== Handshake ===================== |
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q := []byte("\xaa") |
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//log.Printf("Query: %q\n", q) |
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log.Println("Starting handshake...") |
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n, err := s.Write(q) |
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if err != nil { |
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return items, err |
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} |
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buf := make([]byte, 128) |
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n, err = getData(s, buf, 1) |
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if err != nil { |
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return items, err |
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} |
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if n == 1 && buf[0] == '\x55' { |
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log.Println("Handshake successful.") |
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} else { |
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log.Printf("(%d bytes) %q\n", n, buf[:n]) |
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s.Close() |
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return items, fmt.Errorf("handshake failed") |
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} |
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// =================== Desc ===================== |
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q = []byte("\xa4") |
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//log.Printf("Query: %q\n", q) |
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log.Println("Requesting device description...") |
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n, err = s.Write(q) |
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if err != nil { |
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return items, err |
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} |
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n, err = getData(s, buf, 32) |
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log.Printf("DESC> %q\n", buf[:n]) |
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// =================== Count ===================== |
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q = []byte("\xa2") |
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//log.Printf("Query: %q\n", q) |
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log.Println("Requesting data counter...") |
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n, err = s.Write(q) |
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if err != nil { |
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return items, err |
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} |
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n, err = getData(s, buf, 1) |
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if err != nil { |
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return items, err |
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} |
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var nRecords int |
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if n == 1 { |
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log.Printf("%d item(s) available.", buf[0]) |
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nRecords = int(buf[0]) |
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} else { |
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log.Printf("(%d bytes) %q\n", n, buf[:n]) |
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return items, fmt.Errorf("no measurement found") |
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} |
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// =================== Records ===================== |
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for i := 0; i < nRecords; i++ { |
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q = []byte{'\xa3', uint8(i + 1)} |
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//log.Printf("Query: %q\n", q) |
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//log.Printf("Requesting measurement %d...", i+1) |
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n, err = s.Write(q) |
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if err != nil { |
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return items, err |
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} |
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n, err = getData(s, buf, 9) |
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//log.Printf("DESC> %q\n", buf[:n]) |
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var data measurement |
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data.Header = int(buf[0]) |
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data.Systolic = int(buf[1]) + 25 |
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data.Diastolic = int(buf[2]) + 25 |
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data.Pulse = int(buf[3]) |
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data.Month = int(buf[4]) |
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data.Day = int(buf[5]) |
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data.Hour = int(buf[6]) |
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data.Minute = int(buf[7]) |
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data.Year = int(buf[8]) + 2000 |
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items = append(items, data) |
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} |
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s.Close() |
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return items, nil |
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} |
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func loadFromJSONFile(filename string) (items []measurement, err error) { |
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data, err := ioutil.ReadFile(filename) |
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if err != nil { |
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return items, err |
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} |
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err = json.Unmarshal(data, &items) |
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return items, err |
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} |
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func mergeItems(newItems, oldItems []measurement) []measurement { |
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var result []measurement |
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var j int |
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// TODO: Would be better to compare dates and merge chronologically... |
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for _, nItem := range newItems { |
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result = append(result, nItem) |
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if j+1 <= len(oldItems) && nItem == oldItems[j] { |
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j++ |
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} |
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} |
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if j+1 <= len(oldItems) { |
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157 |
result = append(result, oldItems[j:]...) |
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158 |
} |
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159 |
return result |
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160 |
} |
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161 |
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162 |
func main() { |
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163 |
inFile := flag.String([]string{"-input-file", "i"}, "", "Input JSON file") |
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164 |
outFile := flag.String([]string{"-output-file", "o"}, "", "Output JSON file") |
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165 |
limit := flag.Uint([]string{"-limit", "l"}, 0, "Limit number of items") |
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166 |
format := flag.String([]string{"-format", "f"}, "", "Output format (csv, json)") |
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167 |
avg := flag.Bool([]string{"-average", "a"}, false, "Compute average") |
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168 |
merge := flag.Bool([]string{"-merge", "m"}, false, |
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169 |
"Try to merge input JSON file with fetched data") |
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170 |
device := flag.String([]string{"-device", "d"}, "/dev/ttyUSB0", "Serial device") |
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171 |
|
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172 |
flag.Parse() |
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173 |
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174 |
switch *format { |
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175 |
case "": |
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176 |
if *outFile == "" { |
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177 |
*format = "csv" |
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178 |
} |
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179 |
break |
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180 |
case "json", "csv": |
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181 |
break |
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182 |
default: |
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183 |
log.Fatal("Unknown output format. Possible choices are csv, json.") |
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184 |
} |
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185 |
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186 |
var err error |
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187 |
var items []measurement |
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188 |
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189 |
if *inFile == "" { |
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190 |
// Read from device |
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191 |
if items, err = fetchData(*device); err != nil { |
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192 |
log.Fatal(err) |
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193 |
} |
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194 |
} else { |
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195 |
// Read from file |
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196 |
var fileItems []measurement |
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197 |
if fileItems, err = loadFromJSONFile(*inFile); err != nil { |
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198 |
log.Fatal(err) |
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199 |
} |
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200 |
if *merge { |
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201 |
if items, err = fetchData(*device); err != nil { |
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202 |
log.Fatal(err) |
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203 |
} |
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items = mergeItems(items, fileItems) |
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205 |
} else { |
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206 |
items = fileItems |
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207 |
} |
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208 |
} |
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209 |
|
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210 |
if *limit > 0 && len(items) > int(*limit) { |
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211 |
items = items[0:*limit] |
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212 |
} |
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213 |
|
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214 |
var avgMeasure measurement |
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215 |
var avgCount int |
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216 |
|
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217 |
for i, data := range items { |
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218 |
if *format == "csv" { |
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219 |
fmt.Printf("%d;%x;%d-%02d-%02d %02d:%02d;%d;%d;%d\n", |
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220 |
i+1, data.Header, |
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221 |
data.Year, data.Month, data.Day, |
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222 |
data.Hour, data.Minute, |
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223 |
data.Systolic, data.Diastolic, data.Pulse) |
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224 |
} |
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225 |
|
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226 |
avgMeasure.Systolic += data.Systolic |
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avgMeasure.Diastolic += data.Diastolic |
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228 |
avgMeasure.Pulse += data.Pulse |
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229 |
avgCount++ |
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230 |
} |
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231 |
|
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232 |
if *avg && avgCount > 0 { |
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233 |
avgMeasure.Systolic /= avgCount |
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234 |
avgMeasure.Diastolic /= avgCount |
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235 |
avgMeasure.Pulse /= avgCount |
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236 |
|
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237 |
fmt.Printf("Average: %d;%d;%d\n", avgMeasure.Systolic, |
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238 |
avgMeasure.Diastolic, avgMeasure.Pulse) |
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239 |
} |
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240 |
|
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241 |
if *format == "json" || *outFile != "" { |
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242 |
rawJSON, err := json.MarshalIndent(items, "", " ") |
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243 |
if err != nil { |
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244 |
log.Fatal("Error:", err) |
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245 |
} |
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246 |
|
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247 |
if *format == "json" { |
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248 |
fmt.Println(string(rawJSON)) |
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249 |
} |
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250 |
if *outFile != "" { |
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251 |
err = ioutil.WriteFile(*outFile, rawJSON, 0600) |
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252 |
if err != nil { |
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253 |
log.Println("Could not write output file:", err) |
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254 |
} |
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255 |
} |
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256 |
} |
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257 |
} |