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unmarshal.go
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unmarshal.go
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package graph
import (
"encoding/json"
"sync"
"github.com/Tahler/isotope/convert/pkg/graph/pct"
"github.com/Tahler/isotope/convert/pkg/graph/script"
"github.com/Tahler/isotope/convert/pkg/graph/size"
"github.com/Tahler/isotope/convert/pkg/graph/svc"
"github.com/Tahler/isotope/convert/pkg/graph/svctype"
)
// UnmarshalJSON converts b into a valid ServiceGraph. See validate() for the
// details on what it means to be "valid".
func (g *ServiceGraph) UnmarshalJSON(b []byte) (err error) {
metadata := serviceGraphJSONMetadata{Defaults: defaultDefaults}
err = json.Unmarshal(b, &metadata)
if err != nil {
return
}
*g, err = parseJSONServiceGraphWithDefaults(b, metadata.Defaults)
if err != nil {
return
}
err = validate(*g)
if err != nil {
return
}
return
}
func parseJSONServiceGraphWithDefaults(
b []byte, defaults defaults) (sg ServiceGraph, err error) {
withGlobalDefaults(defaults, func() {
var unmarshallable unmarshallableServiceGraph
innerErr := json.Unmarshal(b, &unmarshallable)
if innerErr == nil {
sg = ServiceGraph(unmarshallable)
} else {
err = innerErr
}
})
return
}
// defaultDefaults is a stuttery but validly semantic name for the default
// values when parsing JSON defaults.
var (
defaultDefaults = defaults{
Type: svctype.ServiceHTTP,
NumReplicas: 1,
}
defaultMutex sync.Mutex
)
type serviceGraphJSONMetadata struct {
Defaults defaults `json:"defaults"`
}
type defaults struct {
Type svctype.ServiceType `json:"type"`
NumReplicas int32 `json:"numReplicas"`
ErrorRate pct.Percentage `json:"errorRate"`
ResponseSize size.ByteSize `json:"responseSize"`
Script script.Script `json:"script"`
RequestSize size.ByteSize `json:"requestSize"`
}
func withGlobalDefaults(defaults defaults, f func()) {
defaultMutex.Lock()
origDefaultService := svc.DefaultService
svc.DefaultService = svc.Service{
Type: defaults.Type,
NumReplicas: defaults.NumReplicas,
ErrorRate: defaults.ErrorRate,
ResponseSize: defaults.ResponseSize,
Script: defaults.Script,
}
origDefaultRequestCommand := script.DefaultRequestCommand
script.DefaultRequestCommand = script.RequestCommand{
Size: defaults.RequestSize,
}
f()
svc.DefaultService = origDefaultService
script.DefaultRequestCommand = origDefaultRequestCommand
defaultMutex.Unlock()
}
type unmarshallableServiceGraph ServiceGraph