add orderby clause

db.go

@@ -141,12 +141,20 @@ type LimitOffsetModifier struct {
 	Offset int
 }
 
-func (l LimitOffsetModifier) ModifyStatement(sb *strings.Builder) error {
+func (l *LimitOffsetModifier) ModifyStatement(sb *strings.Builder) error {
 	clause := fmt.Sprintf(" LIMIT %d OFFSET %d", l.Limit, l.Offset)
 	sb.WriteString(clause)
 	return nil
 }
 
+type OrderByTimestampModifer struct {
+}
+
+func (o *OrderByTimestampModifer) ModifyStatement(sb *strings.Builder) error {
+	sb.WriteString(" ORDER BY ts DESC")
+	return nil
+}
+
 // BusEventFilter is a filter for bus events.
 type BusEventFilter struct {
 	Names          []string

http.go

@@ -264,12 +264,14 @@ func apiV1GetValues(db *TelemDb) http.HandlerFunc {
 		// override the bus event filter name option
 		bef.Names = []string{name}
 
+		var order = &OrderByTimestampModifer{}
+
 		var res []Datum
 		// make the call, skip the limit modifier if it's nil.
 		if lim == nil {
-			res, err = db.GetValues(r.Context(), *bef, field)
+			res, err = db.GetValues(r.Context(), *bef, field, order)
 		} else {
-			res, err = db.GetValues(r.Context(), *bef, field, lim)
+			res, err = db.GetValues(r.Context(), *bef, field, lim, order)
 		}
 		if err != nil {
 			// 500 server error:

readme.md

@@ -68,3 +68,39 @@ Certain features, like socketCAN support, are only enabled on platforms that sup
 This is handled automatically; builds will exclude the socketCAN files and 
 the additional commands and features will not be present in the CLI.
 
+### Lightweight Build
+
+This doesn't include the OpenMCT files, but is simpler to build, and doesn't require Node setup.
+You must install Go.
+```
+$ go build ./cmd/gotelem
+```
+
+### Full Build
+
+This includes an integrated OpenMCT build, which automatically connects to the Telemetry server
+for historical and live data. You must have both Go and Node.JS installed.
+
+```
+$ cd web/
+$ npm install
+$ npm run build
+$ cd ..
+$ go build -tags openmct ./cmd/gotelem
+```
+
+## Development
+
+During development, it can be useful to have the OpenMCT sources be served separately from Gotelem,
+so you don't need to rebuild everything. This case is supported:
+
+```
+$ go run ./cmd/gotelem server --db gotelem.db # in one terminal
+$ npm run serve # in a separate terminal
+```
+When using the dev server, webpack will set the Gotelem URL to `localhost:8080`. If you're running
+Gotelem using the default settings, this should work out of the box. Making changes to the OpenMCT
+plugins will trigger a refresh automatically.
+
+
+

web/src/app.js

@@ -142,6 +142,7 @@ const TelemHistoryProvider = {
             start: new Date(opt.start).toISOString(),
             end: new Date(opt.end).toISOString(),
         })
+        console.log((opt.end - opt.start)/opt.size)
         return fetch(url + params).then((resp) => {
             return resp.json()
         })