Backend image rendering as plugin (#11966)

* rendering: headless chrome progress

* renderer: minor change

* grpc: version hell

* updated grpc libs

* wip: minor progess

* rendering: new image rendering plugin is starting to work

* feat: now phantomjs works as well and updated alerting to use new rendering service

* refactor: renamed renderer package and service to rendering to make renderer name less confusing (rendering is internal service that handles the renderer plugin now)

* rendering: now render key is passed and render auth is working in plugin mode

* removed unneeded lines from gitignore

* rendering: now plugin mode supports waiting for all panels to complete rendering

* fix: LastSeenAt fix for render calls, was not set which causes a lot of updates to Last Seen at during rendering, this should fix sqlite db locked issues in seen in previous releases

* change: changed render tz url parameter to use proper timezone name as chrome does not handle UTC offset TZ values

* fix: another update to tz param generation

* renderer: added http mode to renderer service, new ini setting [rendering] server_url

vendor/github.com/hashicorp/go-hclog/int.go

@@ -214,6 +214,8 @@ func (z *intLogger) log(t time.Time, level Level, msg string, args ...interface{
 			case CapturedStacktrace:
 				stacktrace = st
 				continue FOR
+			case Format:
+				val = fmt.Sprintf(st[0].(string), st[1:]...)
 			default:
 				val = fmt.Sprintf("%v", st)
 			}
@@ -274,6 +276,8 @@ func (z *intLogger) logJson(t time.Time, level Level, msg string, args ...interf
 		}
 	}
 
+	args = append(z.implied, args...)
+
 	if args != nil && len(args) > 0 {
 		if len(args)%2 != 0 {
 			cs, ok := args[len(args)-1].(CapturedStacktrace)
@@ -292,16 +296,20 @@ func (z *intLogger) logJson(t time.Time, level Level, msg string, args ...interf
 				continue
 			}
 			val := args[i+1]
-			// Check if val is of type error. If error type doesn't
-			// implement json.Marshaler or encoding.TextMarshaler
-			// then set val to err.Error() so that it gets marshaled
-			if err, ok := val.(error); ok {
-				switch err.(type) {
+			switch sv := val.(type) {
+			case error:
+				// Check if val is of type error. If error type doesn't
+				// implement json.Marshaler or encoding.TextMarshaler
+				// then set val to err.Error() so that it gets marshaled
+				switch sv.(type) {
 				case json.Marshaler, encoding.TextMarshaler:
 				default:
-					val = err.Error()
+					val = sv.Error()
 				}
+			case Format:
+				val = fmt.Sprintf(sv[0].(string), sv[1:]...)
 			}
+
 			vals[args[i].(string)] = val
 		}
 	}
@@ -368,6 +376,8 @@ func (z *intLogger) IsError() bool {
 func (z *intLogger) With(args ...interface{}) Logger {
 	var nz intLogger = *z
 
+	nz.implied = make([]interface{}, 0, len(z.implied)+len(args))
+	nz.implied = append(nz.implied, z.implied...)
 	nz.implied = append(nz.implied, args...)
 
 	return &nz

vendor/github.com/hashicorp/go-hclog/log.go

@@ -37,6 +37,18 @@ const (
 	Error Level = 5
 )
 
+// When processing a value of this type, the logger automatically treats the first
+// argument as a Printf formatting string and passes the rest as the values to be
+// formatted. For example: L.Info(Fmt{"%d beans/day", beans}). This is a simple
+// convience type for when formatting is required.
+type Format []interface{}
+
+// Fmt returns a Format type. This is a convience function for creating a Format
+// type.
+func Fmt(str string, args ...interface{}) Format {
+	return append(Format{str}, args...)
+}
+
 // LevelFromString returns a Level type for the named log level, or "NoLevel" if
 // the level string is invalid. This facilitates setting the log level via
 // config or environment variable by name in a predictable way.

vendor/github.com/hashicorp/go-hclog/nulllogger.go

@@ -0,0 +1,45 @@
+package hclog
+
+import (
+	"log"
+	"io/ioutil"
+)
+
+// NewNullLogger instantiates a Logger for which all calls
+// will succeed without doing anything.
+// Useful for testing purposes.
+func NewNullLogger() Logger {
+	return &nullLogger{}
+}
+
+type nullLogger struct{}
+
+func (l *nullLogger) Trace(msg string, args ...interface{}) {}
+
+func (l *nullLogger) Debug(msg string, args ...interface{}) {}
+
+func (l *nullLogger) Info(msg string, args ...interface{}) {}
+
+func (l *nullLogger) Warn(msg string, args ...interface{}) {}
+
+func (l *nullLogger) Error(msg string, args ...interface{}) {}
+
+func (l *nullLogger) IsTrace() bool { return false }
+
+func (l *nullLogger) IsDebug() bool { return false }
+
+func (l *nullLogger) IsInfo() bool { return false }
+
+func (l *nullLogger) IsWarn() bool { return false }
+
+func (l *nullLogger) IsError() bool { return false }
+
+func (l *nullLogger) With(args ...interface{}) Logger { return l }
+
+func (l *nullLogger) Named(name string) Logger { return l }
+
+func (l *nullLogger) ResetNamed(name string) Logger { return l }
+
+func (l *nullLogger) StandardLogger(opts *StandardLoggerOptions) *log.Logger {
+	return log.New(ioutil.Discard, "", log.LstdFlags)
+}