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config.go
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config.go
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package flow
import (
"fmt"
"strings"
"github.com/grafana/agent/pkg/river/ast"
"github.com/grafana/agent/pkg/river/diag"
"github.com/grafana/agent/pkg/river/parser"
"github.com/grafana/agent/pkg/river/vm"
)
// An Argument is an input to a Flow module.
type Argument struct {
// Name of the argument.
Name string `river:",label"`
// Whether the Argument must be provided when evaluating the file.
Optional bool `river:"optional,attr,optional"`
// Description for the Argument.
Comment string `river:"comment,attr,optional"`
// Default value for the argument.
Default any `river:"default,attr,optional"`
}
// File holds the contents of a parsed Flow file.
type File struct {
Name string // File name given to ReadFile.
Node *ast.File // Raw File node.
Arguments []Argument // Arguments found in the file.
// Components holds the list of raw River AST blocks describing components.
// The Flow controller can interpret them.
Components []*ast.BlockStmt
ConfigBlocks []*ast.BlockStmt
}
// ReadFile parses the River file specified by bb into a File. name should be
// the name of the file used for reporting errors.
func ReadFile(name string, bb []byte) (*File, error) {
node, err := parser.ParseFile(name, bb)
if err != nil {
return nil, err
}
// Look for predefined non-components blocks (i.e., logging), and store
// everything else into a list of components.
//
// TODO(rfratto): should this code be brought into a helper somewhere? Maybe
// in ast?
var (
components []*ast.BlockStmt
configs []*ast.BlockStmt
args []Argument
namedArgs = make(map[string]struct{})
)
for _, stmt := range node.Body {
switch stmt := stmt.(type) {
case *ast.AttributeStmt:
return nil, diag.Diagnostic{
Severity: diag.SeverityLevelError,
StartPos: ast.StartPos(stmt.Name).Position(),
EndPos: ast.EndPos(stmt.Name).Position(),
Message: "unrecognized attribute " + stmt.Name.Name,
}
case *ast.BlockStmt:
fullName := strings.Join(stmt.Name, ".")
switch fullName {
case "logging":
configs = append(configs, stmt)
case "tracing":
configs = append(configs, stmt)
case "argument":
var arg Argument
if err := vm.New(stmt).Evaluate(nil, &arg); err != nil {
return nil, err
}
if _, exist := namedArgs[arg.Name]; exist {
return nil, diag.Diagnostic{
Severity: diag.SeverityLevelError,
StartPos: ast.StartPos(stmt).Position(),
EndPos: ast.EndPos(stmt).Position(),
Message: fmt.Sprintf("argument %q declared more than once", arg.Name),
}
}
args = append(args, arg)
namedArgs[arg.Name] = struct{}{}
case "export":
configs = append(configs, stmt)
default:
components = append(components, stmt)
}
default:
return nil, diag.Diagnostic{
Severity: diag.SeverityLevelError,
StartPos: ast.StartPos(stmt).Position(),
EndPos: ast.EndPos(stmt).Position(),
Message: fmt.Sprintf("unsupported statement type %T", stmt),
}
}
}
return &File{
Name: name,
Node: node,
Arguments: args,
Components: components,
ConfigBlocks: configs,
}, nil
}