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crawler.go
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crawler.go
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package internal
import (
"errors"
"time"
"github.com/dapings/examples/go-programing-tour-2023/crawler/collect"
"github.com/dapings/examples/go-programing-tour-2023/crawler/engine"
"github.com/dapings/examples/go-programing-tour-2023/crawler/limiter"
"github.com/dapings/examples/go-programing-tour-2023/crawler/log"
"github.com/dapings/examples/go-programing-tour-2023/crawler/proxy"
"github.com/dapings/examples/go-programing-tour-2023/crawler/spider"
"github.com/dapings/examples/go-programing-tour-2023/crawler/sqldb"
"github.com/dapings/examples/go-programing-tour-2023/crawler/storage/sqlstorage"
"github.com/go-micro/plugins/v4/config/encoder/toml"
"go-micro.dev/v4/config"
"go-micro.dev/v4/config/reader"
"go-micro.dev/v4/config/reader/json"
"go-micro.dev/v4/config/source"
"go-micro.dev/v4/config/source/file"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"golang.org/x/time/rate"
)
func LoadConfig(cfgFile string) (config.Config, error) {
// load config
enc := toml.NewEncoder()
cfg, cfgErr := config.NewConfig(config.WithReader(json.NewReader(reader.WithEncoder(enc))))
if cfgErr != nil {
return nil, cfgErr
}
err := cfg.Load(file.NewSource(file.WithPath(cfgFile), source.WithEncoder(enc)))
if err != nil {
return nil, err
}
return cfg, nil
}
func ConfigLogger(cfg config.Config) (*zap.Logger, error) {
if cfg == nil {
return nil, errors.New("config nil")
}
logText := cfg.Get("logLevel").String("INFO")
logLevel, err := zapcore.ParseLevel(logText)
if err != nil {
return nil, err
}
// logger
plugin := log.NewStdoutPlugin(logLevel)
logger := log.NewLogger(plugin)
logger.Info("logger init")
// set zap global logger
zap.ReplaceGlobals(logger)
return logger, nil
}
func ConfigProxyFunc(cfg config.Config, logger *zap.Logger) (proxy.Func, int, error) {
// proxy
var err error
var proxyFunc proxy.Func
proxyURLs := cfg.Get("fetcher", "proxy").StringSlice([]string{})
timeout := cfg.Get("fetcher", "timeout").Int(5000)
logger.Sugar().Info("proxy list:", proxyURLs, " timeout: ", timeout)
if proxyFunc, err = proxy.RoundRobinProxySwitcher(proxyURLs...); err != nil {
logger.Error("round robin proxy switcher failed", zap.Error(err))
return nil, 0, err
}
return proxyFunc, timeout, nil
}
func ConfigFetcher(proxyFunc proxy.Func, timeout int, logger *zap.Logger) spider.Fetcher {
// fetcher
return collect.BrowserFetch{Timeout: time.Duration(timeout) * time.Millisecond, Proxy: proxyFunc, Logger: logger}
}
func ConfigStorager(cfg config.Config, logger *zap.Logger) (spider.Storage, error) {
// storage
var storager spider.Storage
var err error
sqlURL := cfg.Get("storage", "sqlURL").String("")
sqldb.ConnStrWithMySQL = sqlURL
if storager, err = sqlstorage.New(
sqlstorage.WithSQLURL(sqldb.ConnStrWithMySQL),
sqlstorage.WithLogger(logger.Named("sqlDB")),
sqlstorage.WithBatchCount(2),
); err != nil {
logger.Error("create sql storage failed", zap.Error(err))
return nil, err
}
return storager, nil
}
func ParseTaskConfig(logger *zap.Logger, f spider.Fetcher, s spider.Storage, cfgs []spider.TaskConfig) []*spider.Task {
tasks := make([]*spider.Task, 0, 1000)
for _, cfg := range cfgs {
t := spider.NewTask(
spider.WithName(cfg.Name),
spider.WithReload(cfg.Reload),
spider.WithCookie(cfg.Cookie),
spider.WithLogger(logger),
spider.WithStorage(s),
)
if cfg.WaitTime > 0 {
t.WaitTime = cfg.WaitTime
}
if cfg.MaxDepth > 0 {
t.MaxDepth = cfg.MaxDepth
}
var limits []limiter.RateLimiter
if len(cfg.Limits) > 0 {
for _, limitCfg := range cfg.Limits {
// speed limiter 限速器,2秒1个,60秒20个
l := rate.NewLimiter(limiter.Per(limitCfg.EventCount, time.Duration(limitCfg.EventDur)*time.Second), limitCfg.Bucket)
limits = append(limits, l)
}
multiLimiter := limiter.Multi(limits...)
t.Limit = multiLimiter
}
switch cfg.Fetcher {
case "browser":
t.Fetcher = f
}
tasks = append(tasks, t)
}
return tasks
}
func ConfigTasks(cfg config.Config, f spider.Fetcher, storager spider.Storage, logger *zap.Logger) ([]*spider.Task, error) {
// init tasks
// seeds slice cap
var seeds = make([]*spider.Task, 0, 1000)
var taskCfg []spider.TaskConfig
if err := cfg.Get("Tasks").Scan(&taskCfg); err != nil {
logger.Error("init seed tasks failed", zap.Error(err))
return nil, err
}
seeds = ParseTaskConfig(logger, f, storager, taskCfg)
return seeds, nil
}
func ConfigWorkerEngine(sconfig *ServerConfig, seeds []*spider.Task, f spider.Fetcher, storager spider.Storage, logger *zap.Logger) (*engine.Crawler, error) {
s, err := engine.NewEngine(
engine.WithWorkCount(5),
engine.WithFetcher(f),
engine.WithLogger(logger),
engine.WithSeeds(seeds),
engine.WithRegistryURL(sconfig.RegistryAddr),
engine.WithScheduler(engine.NewSchedule()),
engine.WithStorage(storager),
)
return s, err
}
func ConfigMasterServer(cfg config.Config, logger *zap.Logger) (*ServerConfig, error) {
var sconfig ServerConfig
if err := cfg.Get("MasterServer").Scan(&sconfig); err != nil {
logger.Error("get master gRPC Server config failed", zap.Error(err))
return nil, err
}
logger.Sugar().Debugf("master grpc server config, %+v", sconfig)
return &sconfig, nil
}
func ConfigWorkerServer(cfg config.Config, logger *zap.Logger) (*ServerConfig, error) {
var sconfig ServerConfig
if err := cfg.Get("GRPCServer").Scan(&sconfig); err != nil {
logger.Error("get worker gRPC Server config failed", zap.Error(err))
return nil, err
}
logger.Sugar().Debugf("worker grpc server config, %+v", sconfig)
return &sconfig, nil
}