neo-go/pkg/config/config.go

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package config
import (
"bytes"
"fmt"
"net/http"
"os"
"path/filepath"
"time"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"gopkg.in/yaml.v3"
)
const (
// UserAgentWrapper is a string that user agent string should be wrapped into.
UserAgentWrapper = "/"
// UserAgentPrefix is a prefix used to generate user agent string.
UserAgentPrefix = "NEO-GO:"
// UserAgentFormat is a formatted string used to generate user agent string.
UserAgentFormat = UserAgentWrapper + UserAgentPrefix + "%s" + UserAgentWrapper
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// DefaultMaxIteratorResultItems is the default upper bound of traversed
// iterator items per JSON-RPC response. It covers both session-based and
// naive iterators.
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DefaultMaxIteratorResultItems = 100
// DefaultMaxFindResultItems is the default maximum number of resulting
// contract states items that can be retrieved by `findstates` JSON-RPC handler.
DefaultMaxFindResultItems = 100
// DefaultMaxFindStorageResultItems is the default maximum number of resulting
// contract storage items that can be retrieved by `findstorge` JSON-RPC handler.
DefaultMaxFindStorageResultItems = 50
// DefaultMaxNEP11Tokens is the default maximum number of resulting NEP11 tokens
// that can be traversed by `getnep11balances` JSON-RPC handler.
DefaultMaxNEP11Tokens = 100
// DefaultMaxRequestBodyBytes is the default maximum allowed size of HTTP
// request body in bytes.
DefaultMaxRequestBodyBytes = 5 * 1024 * 1024
// DefaultMaxRequestHeaderBytes is the maximum permitted size of the headers
// in an HTTP request.
DefaultMaxRequestHeaderBytes = http.DefaultMaxHeaderBytes
)
// Version is the version of the node, set at the build time.
var Version string
// Config top level struct representing the config
// for the node.
type Config struct {
ProtocolConfiguration ProtocolConfiguration `yaml:"ProtocolConfiguration"`
ApplicationConfiguration ApplicationConfiguration `yaml:"ApplicationConfiguration"`
}
// GenerateUserAgent creates a user agent string based on the build time environment.
func (c Config) GenerateUserAgent() string {
return fmt.Sprintf(UserAgentFormat, Version)
}
// Blockchain generates a Blockchain configuration based on Protocol and
// Application settings.
func (c Config) Blockchain() Blockchain {
return Blockchain{
ProtocolConfiguration: c.ProtocolConfiguration,
Ledger: c.ApplicationConfiguration.Ledger,
}
}
// Load attempts to load the config from the given
// path for the given netMode. If relativePath is not empty, relative paths in the
// config will be updated based on the provided relative path.
func Load(path string, netMode netmode.Magic, relativePath ...string) (Config, error) {
configPath := fmt.Sprintf("%s/protocol.%s.yml", path, netMode)
return LoadFile(configPath, relativePath...)
}
// LoadFile loads config from the provided path. It also applies backwards compatibility
// fixups if necessary. If relativePath is not empty, relative paths in the config will
// be updated based on the provided relative path.
func LoadFile(configPath string, relativePath ...string) (Config, error) {
if _, err := os.Stat(configPath); os.IsNotExist(err) {
return Config{}, fmt.Errorf("config '%s' doesn't exist", configPath)
}
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configData, err := os.ReadFile(configPath)
if err != nil {
return Config{}, fmt.Errorf("unable to read config: %w", err)
}
config := Config{
ApplicationConfiguration: ApplicationConfiguration{
P2P: P2P{
PingInterval: 30 * time.Second,
PingTimeout: 90 * time.Second,
},
},
}
decoder := yaml.NewDecoder(bytes.NewReader(configData))
decoder.KnownFields(true)
err = decoder.Decode(&config)
if err != nil {
return Config{}, fmt.Errorf("failed to unmarshal config YAML: %w", err)
}
if len(relativePath) == 1 && relativePath[0] != "" {
updateRelativePaths(relativePath[0], &config)
}
err = config.ProtocolConfiguration.Validate()
if err != nil {
return Config{}, err
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}
return config, nil
}
// updateRelativePaths updates relative paths in the config structure based on the provided relative path.
func updateRelativePaths(relativePath string, config *Config) {
updatePath := func(path *string) {
if *path != "" && !filepath.IsAbs(*path) {
*path = filepath.Join(relativePath, *path)
}
}
updatePath(&config.ApplicationConfiguration.LogPath)
updatePath(&config.ApplicationConfiguration.DBConfiguration.BoltDBOptions.FilePath)
updatePath(&config.ApplicationConfiguration.DBConfiguration.LevelDBOptions.DataDirectoryPath)
updatePath(&config.ApplicationConfiguration.Consensus.UnlockWallet.Path)
updatePath(&config.ApplicationConfiguration.P2PNotary.UnlockWallet.Path)
updatePath(&config.ApplicationConfiguration.Oracle.UnlockWallet.Path)
updatePath(&config.ApplicationConfiguration.StateRoot.UnlockWallet.Path)
}