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middleware.go
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middleware.go
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package middleware
import (
"context"
"github.com/kubemq-io/kubemq-sources/pkg/retry"
"github.com/kubemq-io/kubemq-sources/types"
)
type Middleware interface {
Do(ctx context.Context, request *types.Request) (*types.Response, error)
}
type DoFunc func(ctx context.Context, request *types.Request) (*types.Response, error)
func (df DoFunc) Do(ctx context.Context, request *types.Request) (*types.Response, error) {
return df(ctx, request)
}
type MiddlewareFunc func(Middleware) Middleware
func Log(log *LogMiddleware) MiddlewareFunc {
return func(df Middleware) Middleware {
return DoFunc(func(ctx context.Context, request *types.Request) (*types.Response, error) {
result, err := df.Do(ctx, request)
switch log.minLevel {
case "debug":
reqStr := ""
if request != nil {
reqStr = request.String()
}
resStr := ""
if result != nil {
resStr = result.String()
}
log.Infof("request: %s, response: %s, error:%+v", reqStr, resStr, err)
case "info":
reqStr := ""
if request != nil {
reqStr = request.Metadata
}
resStr := ""
if result != nil {
resStr = result.Metadata
}
if err != nil {
log.Errorf("error processing request: %s, response: %s, error:%s", reqStr, resStr, err.Error())
} else {
log.Infof("successful processing request: %s, response: %s", reqStr, resStr)
}
case "error":
reqStr := ""
if request != nil {
reqStr = request.Metadata
}
resStr := ""
if result != nil {
resStr = result.Metadata
}
if err != nil {
log.Errorf("error processing request: %s, response: %s, error:%s", reqStr, resStr, err.Error())
}
}
return result, err
})
}
}
func RateLimiter(rl *RateLimitMiddleware) MiddlewareFunc {
return func(df Middleware) Middleware {
return DoFunc(func(ctx context.Context, request *types.Request) (*types.Response, error) {
rl.Take()
return df.Do(ctx, request)
})
}
}
func Retry(r *RetryMiddleware) MiddlewareFunc {
return func(df Middleware) Middleware {
return DoFunc(func(ctx context.Context, request *types.Request) (*types.Response, error) {
var resp *types.Response
err := retry.Do(func() error {
var doErr error
resp, doErr = df.Do(ctx, request)
if doErr != nil {
return doErr
}
return nil
}, r.opts...)
return resp, err
})
}
}
func Metric(m *MetricsMiddleware) MiddlewareFunc {
return func(df Middleware) Middleware {
return DoFunc(func(ctx context.Context, request *types.Request) (*types.Response, error) {
resp, err := df.Do(ctx, request)
m.clearReport()
if request != nil {
m.metricReport.RequestVolume = request.Size()
m.metricReport.RequestCount = 1
}
if resp != nil {
m.metricReport.ResponseVolume = resp.Size()
m.metricReport.ResponseCount = 1
}
if err != nil {
m.metricReport.ErrorsCount = 1
}
m.exporter.Report(m.metricReport)
return resp, err
})
}
}
func Chain(md Middleware, list ...MiddlewareFunc) Middleware {
chain := md
for _, middleware := range list {
chain = middleware(chain)
}
return chain
}