说明文档来自官方文档 https://checkr.github.io/flagr/#/flagr_env
完整配置
包含了组件的配置参数以及说明，对于学习如何使用Flagr 还是很重要的，包含了数据库配置、jwt 安全配置、Flagr metrics 配置（对应的Recorder）
目前是kafaka 配置，同时也内置了prometheus 的配置参数，以及一些常用监控工具的指标暴露。
package config
import "time"
// Config is the whole configuration of the app
var Config = struct {
// Host - Flagr server host
Host string `env:"HOST" envDefault:"localhost"`
// Port - Flagr server port
Port int `env:"PORT" envDefault:"18000"`
// LogrusLevel sets the logrus logging level
LogrusLevel string `env:"FLAGR_LOGRUS_LEVEL" envDefault:"info"`
// PProfEnabled - to enable the standard pprof of golang's http server
PProfEnabled bool `env:"FLAGR_PPROF_ENABLED" envDefault:"true"`
// MiddlewareVerboseLoggerEnabled - to enable the negroni-logrus logger for all the endpoints useful for debugging
MiddlewareVerboseLoggerEnabled bool `env:"FLAGR_MIDDLEWARE_VERBOSE_LOGGER_ENABLED" envDefault:"true"`
// MiddlewareGzipEnabled - to enable gzip middleware
MiddlewareGzipEnabled bool `env:"FLAGR_MIDDLEWARE_GZIP_ENABLED" envDefault:"true"`
// RateLimiterPerFlagPerSecondConsoleLogging - to rate limit the logging rate
// per flag per second
RateLimiterPerFlagPerSecondConsoleLogging int `env:"FLAGR_RATELIMITER_PERFLAG_PERSECOND_CONSOLE_LOGGING" envDefault:"100"`
// EvalEnableDebug - controls if we want to return evaluation debugging information back to the api requests
// Note that this is a global switch:
// if it's disabled, no evaluation debug info will be returned.
// if it's enabled, it respects evaluation request's enableDebug field
EvalDebugEnabled bool `env:"FLAGR_EVAL_DEBUG_ENABLED" envDefault:"true"`
// EvalLoggingEnabled - to enable the logging for eval results
EvalLoggingEnabled bool `env:"FLAGR_EVAL_LOGGING_ENABLED" envDefault:"true"`
// EvalCacheRefreshTimeout - timeout of getting the flags data from DB into the in-memory evaluation cache
EvalCacheRefreshTimeout time.Duration `env:"FLAGR_EVALCACHE_REFRESHTIMEOUT" envDefault:"59s"`
// EvalCacheRefreshInterval - time interval of getting the flags data from DB into the in-memory evaluation cache
EvalCacheRefreshInterval time.Duration `env:"FLAGR_EVALCACHE_REFRESHINTERVAL" envDefault:"3s"`
// EvalOnlyMode - will only expose the evaluation related endpoints.
// This field will be derived from DBDriver
EvalOnlyMode bool `env:"FLAGR_EVAL_ONLY_MODE" envDefault:"false"`
/**
DBDriver and DBConnectionStr define how we can write and read flags data.
For databases, flagr supports sqlite3, mysql and postgres.
For read-only evaluation, flagr supports file and http.
Examples:
FLAGR_DB_DBDRIVER FLAGR_DB_DBCONNECTIONSTR
================= ===============================================================
"sqlite3" "/tmp/file.db"
"sqlite3" ":memory:"
"mysql" "root:@tcp(127.0.0.1:18100)/flagr?parseTime=true"
"postgres" "host=myhost user=root dbname=flagr password=mypassword"
"json_file" "/tmp/flags.json" # (it automatically sets EvalOnlyMode=true)
"json_http" "https://example.com/flags.json" # (it automatically sets EvalOnlyMode=true)
*/
DBDriver string `env:"FLAGR_DB_DBDRIVER" envDefault:"sqlite3"`
DBConnectionStr string `env:"FLAGR_DB_DBCONNECTIONSTR" envDefault:"flagr.sqlite"`
// DBConnectionDebug controls whether to show the database connection debugging logs
// warning: it may log the credentials to the stdout
DBConnectionDebug bool `env:"FLAGR_DB_DBCONNECTION_DEBUG" envDefault:"true"`
// DBConnectionRetryAttempts controls how we are going to retry on db connection when start the flagr server
DBConnectionRetryAttempts uint `env:"FLAGR_DB_DBCONNECTION_RETRY_ATTEMPTS" envDefault:"9"`
DBConnectionRetryDelay time.Duration `env:"FLAGR_DB_DBCONNECTION_RETRY_DELAY" envDefault:"100ms"`
// CORSEnabled - enable CORS
CORSEnabled bool `env:"FLAGR_CORS_ENABLED" envDefault:"true"`
// SentryEnabled - enable Sentry and Sentry DSN
SentryEnabled bool `env:"FLAGR_SENTRY_ENABLED" envDefault:"false"`
SentryDSN string `env:"FLAGR_SENTRY_DSN" envDefault:""`
// NewRelicEnabled - enable the NewRelic monitoring for all the endpoints and DB operations
NewRelicEnabled bool `env:"FLAGR_NEWRELIC_ENABLED" envDefault:"false"`
NewRelicAppName string `env:"FLAGR_NEWRELIC_NAME" envDefault:"flagr"`
NewRelicKey string `env:"FLAGR_NEWRELIC_KEY" envDefault:""`
// StatsdEnabled - enable statsd metrics for all the endpoints and DB operations
StatsdEnabled bool `env:"FLAGR_STATSD_ENABLED" envDefault:"false"`
StatsdHost string `env:"FLAGR_STATSD_HOST" envDefault:"127.0.0.1"`
StatsdPort string `env:"FLAGR_STATSD_PORT" envDefault:"8125"`
StatsdPrefix string `env:"FLAGR_STATSD_PREFIX" envDefault:"flagr."`
StatsdAPMEnabled bool `env:"FLAGR_STATSD_APM_ENABLED" envDefault:"false"`
StatsdAPMPort string `env:"FLAGR_STATSD_APM_PORT" envDefault:"8126"`
StatsdAPMServiceName string `env:"FLAGR_STATSD_APM_SERVICE_NAME" envDefault:"flagr"`
// PrometheusEnabled - enable prometheus metrics export
PrometheusEnabled bool `env:"FLAGR_PROMETHEUS_ENABLED" envDefault:"false"`
// PrometheusPath - set the path on which prometheus metrics are available to scrape
PrometheusPath string `env:"FLAGR_PROMETHEUS_PATH" envDefault:"/metrics"`
// PrometheusIncludeLatencyHistogram - set whether Prometheus should also export a histogram of request latencies (this increases cardinality significantly)
PrometheusIncludeLatencyHistogram bool `env:"FLAGR_PROMETHEUS_INCLUDE_LATENCY_HISTOGRAM" envDefault:"false"`
// RecorderEnabled - enable data records logging
RecorderEnabled bool `env:"FLAGR_RECORDER_ENABLED" envDefault:"false"`
// RecorderType - the pipeline to log data records, e.g. Kafka
RecorderType string `env:"FLAGR_RECORDER_TYPE" envDefault:"kafka"`
/**
RecorderFrameOutputMode - indicates which data record frame output mode should we use.
Possible values: payload_string, payload_raw_json
* payload_string mode:
it respects the encryption settings, and it will stringify the payload to unify
the type of the output for both plaintext and encrypted payload.
{"payload":"{"evalContext":{"entityID":"123"},"flagID":1,"flagKey":null,"flagSnapshotID":1,"segmentID":1,"timestamp":null,"variantAttachment":null,"variantID":1,"variantKey":"control"}","encrypted": false}
* payload_raw_json mode:
it ignores the encryption settings.
{"payload":{"evalContext":{"entityID":"123"},"flagID":1,"flagKey":null,"flagSnapshotID":1,"segmentID":1,"timestamp":null,"variantAttachment":null,"variantID":1,"variantKey":"control"}}
*/
RecorderFrameOutputMode string `env:"FLAGR_RECORDER_FRAME_OUTPUT_MODE" envDefault:"payload_string"`
// Kafka related configurations for data records logging (Flagr Metrics)
RecorderKafkaVersion string `env:"FLAGR_RECORDER_KAFKA_VERSION" envDefault:"0.8.2.0"`
RecorderKafkaBrokers string `env:"FLAGR_RECORDER_KAFKA_BROKERS" envDefault:":9092"`
RecorderKafkaCertFile string `env:"FLAGR_RECORDER_KAFKA_CERTFILE" envDefault:""`
RecorderKafkaKeyFile string `env:"FLAGR_RECORDER_KAFKA_KEYFILE" envDefault:""`
RecorderKafkaCAFile string `env:"FLAGR_RECORDER_KAFKA_CAFILE" envDefault:""`
RecorderKafkaVerifySSL bool `env:"FLAGR_RECORDER_KAFKA_VERIFYSSL" envDefault:"false"`
RecorderKafkaVerbose bool `env:"FLAGR_RECORDER_KAFKA_VERBOSE" envDefault:"true"`
RecorderKafkaTopic string `env:"FLAGR_RECORDER_KAFKA_TOPIC" envDefault:"flagr-records"`
RecorderKafkaRetryMax int `env:"FLAGR_RECORDER_KAFKA_RETRYMAX" envDefault:"5"`
RecorderKafkaFlushFrequency time.Duration `env:"FLAGR_RECORDER_KAFKA_FLUSHFREQUENCY" envDefault:"500ms"`
RecorderKafkaEncrypted bool `env:"FLAGR_RECORDER_KAFKA_ENCRYPTED" envDefault:"false"`
RecorderKafkaEncryptionKey string `env:"FLAGR_RECORDER_KAFKA_ENCRYPTION_KEY" envDefault:""`
// Kinesis related configurations for data records logging (Flagr Metrics)
RecorderKinesisStreamName string `env:"FLAGR_RECORDER_KINESIS_STREAM_NAME" envDefault:"flagr-records"`
RecorderKinesisBacklogCount int `env:"FLAGR_RECORDER_KINESIS_BACKLOG_COUNT" envDefault:"500"`
RecorderKinesisMaxConnections int `env:"FLAGR_RECORDER_KINESIS_MAX_CONNECTIONS" envDefault:"24"`
RecorderKinesisFlushInterval time.Duration `env:"FLAGR_RECORDER_KINESIS_FLUSH_INTERVAL" envDefault:"5s"`
RecorderKinesisBatchCount int `env:"FLAGR_RECORDER_KINESIS_BATCH_COUNT" envDefault:"500"`
RecorderKinesisBatchSize int `env:"FLAGR_RECORDER_KINESIS_BATCH_SIZE" envDefault:"0"`
RecorderKinesisAggregateBatchCount int `env:"FLAGR_RECORDER_KINESIS_AGGREGATE_BATCH_COUNT" envDefault:"4294967295"`
RecorderKinesisAggregateBatchSize int `env:"FLAGR_RECORDER_KINESIS_AGGREGATE_BATCH_SIZE" envDefault:"51200"`
RecorderKinesisVerbose bool `env:"FLAGR_RECORDER_KINESIS_VERBOSE" envDefault:"false"`
// Pubsub related configurations for data records logging (Flagr Metrics)
RecorderPubsubProjectID string `env:"FLAGR_RECORDER_PUBSUB_PROJECT_ID" envDefault:""`
RecorderPubsubTopicName string `env:"FLAGR_RECORDER_PUBSUB_TOPIC_NAME" envDefault:"flagr-records"`
RecorderPubsubKeyFile string `env:"FLAGR_RECORDER_PUBSUB_KEYFILE" envDefault:""`
RecorderPubsubVerbose bool `env:"FLAGR_RECORDER_PUBSUB_VERBOSE" envDefault:"false"`
RecorderPubsubVerboseCancelTimeout time.Duration `env:"FLAGR_RECORDER_PUBSUB_VERBOSE_CANCEL_TIMEOUT" envDefault:"5s"`
/**
JWTAuthEnabled enables the JWT Auth
Via Cookies:
The pattern of using JWT auth token using cookies is that it redirects to the URL to set cross subdomain cookie
For example, redirect to auth.example.com/signin, which sets Cookie access_token=jwt_token for domain
".example.com". One can also whitelist some routes so that they don't get blocked by JWT auth
Via Headers:
If you wish to use JWT Auth via headers you can simply set the header `Authorization Bearer [access_token]`
Supported signing methods:
* HS256, in this case `FLAGR_JWT_AUTH_SECRET` contains the passphrase
* RS256, in this case `FLAGR_JWT_AUTH_SECRET` contains the key in PEM Format
Note:
If the access_token is present in both the header and cookie only the latest will be used
*/
JWTAuthEnabled bool `env:"FLAGR_JWT_AUTH_ENABLED" envDefault:"false"`
JWTAuthDebug bool `env:"FLAGR_JWT_AUTH_DEBUG" envDefault:"false"`
JWTAuthPrefixWhitelistPaths []string `env:"FLAGR_JWT_AUTH_WHITELIST_PATHS" envDefault:"/api/v1/evaluation,/static" envSeparator:","`
JWTAuthExactWhitelistPaths []string `env:"FLAGR_JWT_AUTH_EXACT_WHITELIST_PATHS" envDefault:",/" envSeparator:","`
JWTAuthCookieTokenName string `env:"FLAGR_JWT_AUTH_COOKIE_TOKEN_NAME" envDefault:"access_token"`
JWTAuthSecret string `env:"FLAGR_JWT_AUTH_SECRET" envDefault:""`
JWTAuthNoTokenStatusCode int `env:"FLAGR_JWT_AUTH_NO_TOKEN_STATUS_CODE" envDefault:"307"` // "307" or "401"
JWTAuthNoTokenRedirectURL string `env:"FLAGR_JWT_AUTH_NO_TOKEN_REDIRECT_URL" envDefault:""`
JWTAuthUserProperty string `env:"FLAGR_JWT_AUTH_USER_PROPERTY" envDefault:"flagr_user"`
// JWTAuthUserClaim can be used as the indicator of a user for created_by or updated_by.
// E.g. sub, email, user, name, and etc in a JWT token.
JWTAuthUserClaim string `env:"FLAGR_JWT_AUTH_USER_CLAIM" envDefault:"sub"`
// "HS256" and "RS256" supported
JWTAuthSigningMethod string `env:"FLAGR_JWT_AUTH_SIGNING_METHOD" envDefault:"HS256"`
// WebPrefix - base path for web and API
// e.g. FLAGR_WEB_PREFIX=/foo
// UI path => localhost:18000/foo"
// API path => localhost:18000/foo/api/v1"
WebPrefix string `env:"FLAGR_WEB_PREFIX" envDefault:""`
}{}