Add samples for collectors, sinks and receivers

collectors/sampleMetric.go

@@ -0,0 +1,81 @@
+package collectors
+
+import (
+	"encoding/json"
+	"time"
+
+	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
+	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+)
+
+// These are the fields we read from the JSON configuration
+type SampleCollectorConfig struct {
+	Interval string `json:"interval"`
+}
+
+// This contains all variables we need during execution and the variables
+// defined by metricCollector (name, init, ...)
+type SampleCollector struct {
+	metricCollector
+	config SampleTimerCollectorConfig // the configuration structure
+	meta   map[string]string          // default meta information
+	tags   map[string]string          // default tags
+}
+
+func (m *SampleCollector) Init(config json.RawMessage) error {
+	var err error = nil
+	// Always set the name early in Init() to use it in cclog.Component* functions
+	m.name = "InternalCollector"
+	// This is for later use, also call it early
+	m.setup()
+	// Define meta information sent with each metric
+	// (Can also be dynamic or this is the basic set with extension through AddMeta())
+	m.meta = map[string]string{"source": m.name, "group": "SAMPLE"}
+	// Define tags sent with each metric
+	// The 'type' tag is always needed, it defines the granulatity of the metric
+	// node -> whole system
+	// socket -> CPU socket (requires socket ID as 'type-id' tag)
+	// cpu -> single CPU hardware thread (requires cpu ID as 'type-id' tag)
+	m.tags = map[string]string{"type": "node"}
+	// Read in the JSON configuration
+	if len(config) > 0 {
+		err = json.Unmarshal(config, &m.config)
+		if err != nil {
+			cclog.ComponentError(m.name, "Error reading config:", err.Error())
+			return err
+		}
+	}
+
+	// Set up everything that the collector requires during the Read() execution
+	// Check files required, test execution of some commands, create data structure
+	// for all topological entities (sockets, NUMA domains, ...)
+	// Return some useful error message in case of any failures
+
+	// Set this flag only if everything is initialized properly, all required files exist, ...
+	m.init = true
+	return err
+}
+
+func (m *SampleCollector) Read(interval time.Duration, output chan lp.CCMetric) {
+	// Create a sample metric
+	timestamp := time.Now()
+
+	value := 1.0
+	// If you want to measure something for a specific amout of time, use interval
+	// start := readState()
+	// time.Sleep(interval)
+	// stop := readState()
+	// value = (stop - start) / interval.Seconds()
+
+	y, err := lp.New("sample_metric", m.tags, m.meta, map[string]interface{}{"value": value}, timestamp)
+	if err == nil {
+		// Send it to output channel
+		output <- y
+	}
+
+}
+
+func (m *SampleCollector) Close() {
+	// Unset flag
+	m.init = false
+}