func (serv MetricsService) QueryRange(Expr string, End int64, Range int64, Step int64) string {
exprNode, err := rules.LoadExprFromString(Expr)
if err != nil {
return ast.ErrorToJSON(err)
}
if exprNode.Type() != ast.VECTOR {
return ast.ErrorToJSON(errors.New("Expression does not evaluate to vector type"))
}
rb := serv.ResponseBuilder()
rb.SetContentType(gorest.Application_Json)
if End == 0 {
End = time.Now().Unix()
}
if Step < 1 {
Step = 1
}
if End-Range < 0 {
Range = End
}
// Align the start to step "tick" boundary.
End -= End % Step
matrix := ast.EvalVectorRange(
exprNode.(ast.VectorNode),
time.Unix(End-Range, 0),
time.Unix(End, 0),
time.Duration(Step)*time.Second)
sort.Sort(matrix)
return ast.TypedValueToJSON(matrix, "matrix")
}
func (serv MetricsService) Query(Expr string, Json string) (result string) {
exprNode, err := rules.LoadExprFromString(Expr)
if err != nil {
return ast.ErrorToJSON(err)
}
timestamp := time.Now()
rb := serv.ResponseBuilder()
var format ast.OutputFormat
if Json != "" {
format = ast.JSON
rb.SetContentType(gorest.Application_Json)
} else {
format = ast.TEXT
rb.SetContentType(gorest.Text_Plain)
}
return ast.EvalToString(exprNode, ×tamp, format)
}