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config.go
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config.go
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package graphite
import (
"fmt"
"strings"
"github.com/influxdb/influxdb/toml"
"github.com/influxdb/influxdb/tsdb"
)
const (
// DefaultBindAddress is the default binding interface if none is specified.
DefaultBindAddress = ":2003"
// DefaultDatabase is the default database if none is specified.
DefaultDatabase = "graphite"
// DefaultProtocol is the default IP protocol used by the Graphite input.
DefaultProtocol = "tcp"
// DefaultConsistencyLevel is the default write consistency for the Graphite input.
DefaultConsistencyLevel = "one"
// DefaultSeparator is the default join character to use when joining multiple
// measurment parts in a template.
DefaultSeparator = "."
)
// Config represents the configuration for Graphite endpoints.
type Config struct {
BindAddress string `toml:"bind-address"`
Database string `toml:"database"`
Enabled bool `toml:"enabled"`
Protocol string `toml:"protocol"`
BatchSize int `toml:"batch-size"`
BatchTimeout toml.Duration `toml:"batch-timeout"`
ConsistencyLevel string `toml:"consistency-level"`
Templates []string `toml:"templates"`
Tags []string `toml:"tags"`
Separator string `toml:"separator"`
}
// NewConfig returns a new Config with defaults.
func NewConfig() Config {
return Config{
BindAddress: DefaultBindAddress,
Database: DefaultDatabase,
Protocol: DefaultProtocol,
ConsistencyLevel: DefaultConsistencyLevel,
Separator: DefaultSeparator,
}
}
// WithDefaults takes the given config and returns a new config with any required
// default values set.
func (c *Config) WithDefaults() *Config {
d := *c
if d.BindAddress == "" {
d.BindAddress = DefaultBindAddress
}
if d.Database == "" {
d.Database = DefaultDatabase
}
if d.Protocol == "" {
d.Protocol = DefaultProtocol
}
if d.ConsistencyLevel == "" {
d.ConsistencyLevel = DefaultConsistencyLevel
}
if d.Separator == "" {
d.Separator = DefaultSeparator
}
return &d
}
func (c *Config) DefaultTags() tsdb.Tags {
tags := tsdb.Tags{}
for _, t := range c.Tags {
parts := strings.Split(t, "=")
tags[parts[0]] = parts[1]
}
return tags
}
func (c *Config) Validate() error {
if err := c.validateTemplates(); err != nil {
return err
}
if err := c.validateTags(); err != nil {
return err
}
return nil
}
func (c *Config) validateTemplates() error {
// map to keep track of filters we see
filters := map[string]struct{}{}
for i, t := range c.Templates {
parts := strings.Fields(t)
// Ensure template string is non-empty
if len(parts) == 0 {
return fmt.Errorf("missing template at position: %d", i)
}
if len(parts) == 1 && parts[0] == "" {
return fmt.Errorf("missing template at position: %d", i)
}
if len(parts) > 3 {
return fmt.Errorf("invalid template format: '%s'", t)
}
template := t
filter := ""
tags := ""
if len(parts) >= 2 {
filter = parts[0]
template = parts[1]
}
if len(parts) == 3 {
tags = parts[2]
}
// Validate the template has one and only one measurement
if err := c.validateTemplate(template); err != nil {
return err
}
// Prevent duplicate filters in the config
if _, ok := filters[filter]; ok {
return fmt.Errorf("duplicate filter '%s' found at position: %d", filter, i)
}
filters[filter] = struct{}{}
if filter != "" {
// Validate filter expression is valid
if err := c.validateFilter(filter); err != nil {
return err
}
}
if tags != "" {
// Validate tags
for _, tagStr := range strings.Split(tags, ",") {
if err := c.validateTag(tagStr); err != nil {
return err
}
}
}
}
return nil
}
func (c *Config) validateTags() error {
for _, t := range c.Tags {
if err := c.validateTag(t); err != nil {
return err
}
}
return nil
}
func (c *Config) validateTemplate(template string) error {
hasMeasurement := false
for _, p := range strings.Split(template, ".") {
if p == "measurement" || p == "measurement*" {
hasMeasurement = true
}
}
if !hasMeasurement {
return fmt.Errorf("no measurement in template `%s`", template)
}
return nil
}
func (c *Config) validateFilter(filter string) error {
for _, p := range strings.Split(filter, ".") {
if p == "" {
return fmt.Errorf("filter contains blank section: %s", filter)
}
if strings.Contains(p, "*") && p != "*" {
return fmt.Errorf("invalid filter wildcard section: %s", filter)
}
}
return nil
}
func (c *Config) validateTag(keyValue string) error {
parts := strings.Split(keyValue, "=")
if len(parts) != 2 {
return fmt.Errorf("invalid template tags: '%s'", keyValue)
}
if parts[0] == "" || parts[1] == "" {
return fmt.Errorf("invalid template tags: %s'", keyValue)
}
return nil
}