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sdk_version.go
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sdk_version.go
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// The MIT License
//
// Copyright (c) 2022 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package interceptor
import (
"context"
"sync"
"go.temporal.io/version/check"
"google.golang.org/grpc"
"go.temporal.io/server/common/headers"
)
type SDKVersionInterceptor struct {
sync.RWMutex
sdkInfoSet map[check.SDKInfo]struct{}
versionChecker headers.VersionChecker
maxSetSize int
}
const defaultMaxSetSize = 100
// NewSDKVersionInterceptor creates a new SDKVersionInterceptor with default max set size
func NewSDKVersionInterceptor() *SDKVersionInterceptor {
return &SDKVersionInterceptor{
sdkInfoSet: make(map[check.SDKInfo]struct{}),
versionChecker: headers.NewDefaultVersionChecker(),
maxSetSize: defaultMaxSetSize,
}
}
// Intercept a grpc request
func (vi *SDKVersionInterceptor) Intercept(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
sdkName, sdkVersion := headers.GetClientNameAndVersion(ctx)
if sdkName != "" && sdkVersion != "" {
vi.RecordSDKInfo(sdkName, sdkVersion)
if err := vi.versionChecker.ClientSupported(ctx); err != nil {
return nil, err
}
}
return handler(ctx, req)
}
// RecordSDKInfo records name and version tuple in memory
func (vi *SDKVersionInterceptor) RecordSDKInfo(name, version string) {
info := check.SDKInfo{Name: name, Version: version}
vi.RLock()
overCap := len(vi.sdkInfoSet) >= vi.maxSetSize
_, found := vi.sdkInfoSet[info]
vi.RUnlock()
if !overCap && !found {
vi.Lock()
vi.sdkInfoSet[info] = struct{}{}
vi.Unlock()
}
}
// GetAndResetSDKInfo gets all recorded name, version tuples and resets internal records
func (vi *SDKVersionInterceptor) GetAndResetSDKInfo() []check.SDKInfo {
vi.Lock()
currSet := vi.sdkInfoSet
vi.sdkInfoSet = make(map[check.SDKInfo]struct{})
vi.Unlock()
sdkInfo := make([]check.SDKInfo, 0, len(currSet))
for k := range currSet {
sdkInfo = append(sdkInfo, k)
}
return sdkInfo
}