Removed datapoint rename confirmation since everything is automatic

main.go

@@ -29,7 +29,7 @@ import (
 	"time"
 )
 
-const VERSION = "v39"
+const VERSION = "v41"
 
 var (
 	logger              *slog.Logger
@@ -663,6 +663,27 @@ func pageDatapointEdit(w http.ResponseWriter, r *http.Request, _ *session.T) { /
 		}
 	}
 
+	/* Triggers using this datapoint is provided as a list to update
+	 * if changing the datapoint name. Parsing expr and automatically
+	 * changing it to renamed datapoints would be nice in the future. */
+	var triggers []Trigger
+	triggers, err = TriggersRetrieveByDatapoint(datapoint.Name)
+	if err != nil {
+		httpError(w, werr.Wrap(err).Log())
+		return
+	}
+	slices.SortFunc(triggers, func(a, b Trigger) int {
+		an := strings.ToUpper(a.Name)
+		bn := strings.ToUpper(b.Name)
+		if an < bn {
+			return -1
+		}
+		if an > bn {
+			return 1
+		}
+		return 0
+	})
+
 	page := Page{
 		LAYOUT: "main",
 		PAGE:   "datapoint_edit",
@@ -674,6 +695,7 @@ func pageDatapointEdit(w http.ResponseWriter, r *http.Request, _ *session.T) { /
 
 	page.Data = map[string]any{
 		"Datapoint": datapoint,
+		"Triggers":  triggers,
 	}
 	page.Render(w, r)
 	return
@@ -689,8 +711,15 @@ func actionDatapointUpdate(w http.ResponseWriter, r *http.Request, _ *session.T)
 	var nodataSeconds int
 	nodataSeconds, _ = strconv.Atoi(r.FormValue("nodata_seconds"))
 
+	// Datapoint needs to be retrieved from database for the name.
+	// If name has changed, trigger expressions needs to be updated.
 	var dp Datapoint
-	dp.ID = id
+	dp, err = DatapointRetrieve(id, "")
+	if err != nil {
+		httpError(w, werr.Wrap(err).WithData(id).Log())
+		return
+	}
+	prevDatapointName := dp.Name
 	dp.Group = r.FormValue("group")
 	dp.Name = r.FormValue("name")
 	dp.Datatype = DatapointType(r.FormValue("datatype"))
@@ -702,6 +731,29 @@ func actionDatapointUpdate(w http.ResponseWriter, r *http.Request, _ *session.T)
 		return
 	}
 
+	// Update the trigger expressions using this
+	// datapoint name if changed.
+	if prevDatapointName != dp.Name {
+		var triggers []Trigger
+		triggers, err = TriggersRetrieveByDatapoint(dp.Name)
+		if err != nil {
+			httpError(w, werr.Wrap(err).WithData(dp.Name))
+			return
+		}
+		for _, trigger := range triggers {
+			err = trigger.RenameDatapoint(prevDatapointName, dp.Name)
+			if err != nil {
+				httpError(w, werr.Wrap(err).WithData([]string{prevDatapointName, dp.Name}))
+				return
+			}
+			err = trigger.Update()
+			if err != nil {
+				httpError(w, werr.Wrap(err).WithData([]string{prevDatapointName, dp.Name, trigger.Name}))
+				return
+			}
+		}
+	}
+
 	w.Header().Add("Location", "/datapoints")
 	w.WriteHeader(302)
 } // }}}

sql/00027.sql

@@ -0,0 +1,22 @@
+/* Updating a datapoint name also updates the jsonb array entry */
+CREATE OR REPLACE FUNCTION update_triggers_datapoint_name()
+	RETURNS TRIGGER
+	LANGUAGE PLPGSQL
+	AS
+$$
+BEGIN
+UPDATE "trigger"
+	SET
+		datapoints = (datapoints - OLD.name) || jsonb_build_array(NEW.name)
+	WHERE
+		datapoints ? OLD.name;
+
+	RETURN NEW;
+END;
+$$;
+
+CREATE TRIGGER datapoint_renamed
+	AFTER UPDATE
+	ON public.datapoint
+	FOR EACH ROW
+	EXECUTE PROCEDURE update_triggers_datapoint_name();

static/js/datapoint_edit.mjs

@@ -1,5 +1,6 @@
 export class UI {
-	constructor() {
+	constructor(datapointData) {
+		this.datapoint = datapointData
 		document.addEventListener('keydown', evt=>this.keyHandler(evt))
 		document.querySelector('input[name="group"]').focus()
 	}

trigger.go

@@ -4,6 +4,8 @@ import (
 	// External
 	werr "git.gibonuddevalla.se/go/wrappederror"
 	"github.com/expr-lang/expr"
+	"github.com/expr-lang/expr/ast"
+	"github.com/expr-lang/expr/parser"
 	"github.com/lib/pq"
 
 	// Standard
@@ -22,6 +24,17 @@ type Trigger struct {
 	DatapointValues map[string]any
 }
 
+type ExprRenamePatcher struct {
+	OldName string
+	NewName string
+}
+
+func (p ExprRenamePatcher) Visit(node *ast.Node) {
+	if n, ok := (*node).(*ast.IdentifierNode); ok && n.Value == p.OldName {
+		ast.Patch(node, &ast.IdentifierNode{Value: p.NewName})
+	}
+}
+
 func TriggerCreate(sectionID int, name string) (t Trigger, err error) { // {{{
 	t.SectionID = sectionID
 	t.Name = name
@@ -127,6 +140,14 @@ func TriggerRetrieve(id int) (trigger Trigger, err error) { // {{{
 	err = json.Unmarshal(jsonData, &trigger)
 	return
 } // }}}
+func TriggerDelete(id int) (err error) { // {{{
+	_, err = service.Db.Conn.Exec(`DELETE FROM public.trigger WHERE id=$1`, id)
+	if err != nil {
+		return werr.Wrap(err).WithData(id)
+	}
+	return
+} // }}}
+
 func (t *Trigger) Validate() (ok bool, err error) { // {{{
 	if strings.TrimSpace(t.Name) == "" {
 		err = fmt.Errorf("Name can't be empty")
@@ -212,14 +233,6 @@ func (t *Trigger) Update() (err error) { // {{{
 	}
 	return
 } // }}}
-func TriggerDelete(id int) (err error) { // {{{
-	_, err = service.Db.Conn.Exec(`DELETE FROM public.trigger WHERE id=$1`, id)
-	if err != nil {
-		return werr.Wrap(err).WithData(id)
-	}
-	return
-} // }}}
-
 func (t *Trigger) Run() (output any, err error) { // {{{
 	datapoints := make(map[string]Datapoint)
 	for _, dpname := range t.Datapoints {
@@ -248,3 +261,14 @@ func (t *Trigger) Run() (output any, err error) { // {{{
 	}
 	return
 } // }}}
+func (t *Trigger) RenameDatapoint(from, to string) error { // {{{
+	tree, err := parser.Parse(t.Expression)
+	if err != nil {
+		return werr.Wrap(err).WithData(t.Expression)
+	}
+
+	ast.Walk(&tree.Node, ExprRenamePatcher{from, to})
+	t.Expression = tree.Node.String()
+
+	return nil
+} // }}}

views/pages/datapoint_edit.gotmpl

@@ -3,48 +3,59 @@
 
 	<script type="module" defer>
 		import {UI} from "/js/{{ .VERSION }}/datapoint_edit.mjs"
-		window._ui = new UI()
+		window._ui = new UI({{ .Data.Datapoint }})
 	</script>
 
 	{{ block "page_label" . }}{{end}}
 
 	<form id="form-trigger" action="/datapoint/update/{{ .Data.Datapoint.ID }}" method="post">
-	<div id="widgets" class="widgets">
-		<div class="label">Group</div>
-		<div><input type="text" name="group" value="{{ .Data.Datapoint.Group }}"></div>
+		<div id="widgets" class="widgets">
+			<div class="label">Group</div>
+			<div><input type="text" name="group" value="{{ .Data.Datapoint.Group }}"></div>
 
-		<div class="label">Name</div>
-		<div><input type="text" name="name" value="{{ .Data.Datapoint.Name }}"></div>
-		
-		<div class="label">Datatype</div>
-		<div>
-			<select name="datatype">
-				<option {{ if eq .Data.Datapoint.Datatype "INT" }}selected{{end}}>INT</option>
-				<option {{ if eq .Data.Datapoint.Datatype "STRING" }}selected{{end}}>STRING</option>
-				<option {{ if eq .Data.Datapoint.Datatype "DATETIME" }}selected{{end}}>DATETIME</option>
-			</select>
-		</div>
+			<div class="label">Name</div>
+			<div><input type="text" name="name" value="{{ .Data.Datapoint.Name }}"></div>
 
-		<div class="label">No data<br>problem time<br>(seconds)</div>
-		<div>
-			<input type="text" name="nodata_seconds" value="{{ .Data.Datapoint.NodataProblemSeconds }}">
-			<div class="description">A problem is raised and notified if an entry isn't made within this time.</div>
-			<div class="description">Set to 0 to disable.</div>
-		</div>
+			<div class="label">Datatype</div>
+			<div>
+				<select name="datatype">
+					<option {{ if eq .Data.Datapoint.Datatype "INT" }}selected{{end}}>INT</option>
+					<option {{ if eq .Data.Datapoint.Datatype "STRING" }}selected{{end}}>STRING</option>
+					<option {{ if eq .Data.Datapoint.Datatype "DATETIME" }}selected{{end}}>DATETIME</option>
+				</select>
+			</div>
 
-		<div class="label">Comment</div>
-		<div>
-			<textarea name="comment" rows=4>{{ .Data.Datapoint.Comment }}</textarea>
-		</div>
+			<div class="label">No data<br>problem time<br>(seconds)</div>
+			<div>
+				<input type="text" name="nodata_seconds" value="{{ .Data.Datapoint.NodataProblemSeconds }}">
+				<div class="description">A problem is raised and notified if an entry isn't made within this time.</div>
+				<div class="description">Set to 0 to disable.</div>
+			</div>
+
+			<div class="label">Comment</div>
+			<div>
+				<textarea name="comment" rows=4>{{ .Data.Datapoint.Comment }}</textarea>
+			</div>
 
 
-		<div></div>
-		<div class="action">
-			{{ if eq .Data.Datapoint.ID 0 }}
-			<button id="button-update">Create</button>
-			{{ else }}
-			<button id="button-update">Update</button>
-			{{ end }}
+			<div></div>
+			<div class="action">
+				{{ if eq .Data.Datapoint.ID 0 }}
+				<button id="button-update">Create</button>
+				{{ else }}
+				<button id="button-update">Update</button>
+				{{ end }}
+			</div>
+
+			<div></div>
+			<div style="margin-top: 32px">
+				<b>Used in the following triggers:</b>
+				<ul>
+					{{ range .Data.Triggers }}
+					<li><a href="/trigger/edit/{{ .ID }}">{{ .Name }}</a></li>
+					{{ end }}
+				</ul>
+			</div>
 		</div>
 	</form>