Go (golang) plugin in Citellus
I wanted to practice a bit Go programing, so I divided that task in two parts, one, adding a golang extension for Citellus and a sample, but working plugin using it. If interested in the code it’s available at the review at https://review.gerrithub.io/c/citellusorg/citellus/+/495622. The final sample code for it has been: // Author: Pablo Iranzo Gómez ([email protected]) // Header for citellus metadata // long_name: Report detected number of CPU's // description: List the processors detected in the system // priority: 200 package main import ( "bufio" "io" "os" "runtime" "strconv" "strings" ) func main() { var OKAY, _ = strconv.Atoi(os.Getenv("RC_OKAY")) var SKIP, _ = strconv.Atoi(os.Getenv("RC_SKIPPED")) var INFO, _ = strconv.Atoi(os.Getenv("RC_INFO")) var CITELLUS_ROOT = os.Getenv("CITELLUS_ROOT") var CITELLUS_LIVE, _ = strconv.Atoi(os.Getenv("CITELLUS_LIVE")) var FAILED, _ = strconv.Atoi(os.Getenv("RC_FAILED")) if CITELLUS_LIVE == 1 { // Report # of CPU's var CPUS = runtime.NumCPU() os.Stderr.WriteString(strconv.Itoa(CPUS)) os.Exit(INFO) } else if CITELLUS_LIVE == 0 { file, err := os.Open(CITELLUS_ROOT + "/proc/cpuinfo") if err != nil { os.Stderr.WriteString("Failure to open required file " + CITELLUS_ROOT + "/proc/cpuinfo") os.Exit(SKIP) } defer file.Close() counts := wordCount(file) os.Stderr.WriteString(strconv.Itoa(counts["processor"])) os.Exit(INFO) } else { os.Stderr.WriteString("Undefined CITELLUS_LIVE status") os.Exit(FAILED) } // Failback case, exiting as OK os.Exit(OKAY) } // https://forgetcode.com/go/2348-count-the-number-of-word-occurrence-in-given-a-file func wordCount(rdr io.Reader) map[string]int { counts := map[string]int{} scanner := bufio.NewScanner(rdr) scanner.Split(bufio.ScanWords) for scanner.Scan() { word := scanner.Text() word = strings.ToLower(word) counts[word]++ } return counts } Of course, lot of googling helped to start building the pieces. ...