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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package cat
import (
"encoding/json"
"errors"
"fmt"
)
// SyntheticsHeader represents a decoded Synthetics header.
type SyntheticsHeader struct {
Version int
AccountID int
ResourceID string
JobID string
MonitorID string
}
var (
errInvalidSyntheticsJSON = errors.New("invalid synthetics JSON")
errInvalidSyntheticsVersion = errors.New("version is not a float64")
errInvalidSyntheticsAccountID = errors.New("account ID is not a float64")
errInvalidSyntheticsResourceID = errors.New("synthetics resource ID is not a string")
errInvalidSyntheticsJobID = errors.New("synthetics job ID is not a string")
errInvalidSyntheticsMonitorID = errors.New("synthetics monitor ID is not a string")
)
type errUnexpectedSyntheticsVersion int
func (e errUnexpectedSyntheticsVersion) Error() string {
return fmt.Sprintf("unexpected synthetics header version: %d", e)
}
// UnmarshalJSON unmarshalls a SyntheticsHeader from raw JSON.
func (s *SyntheticsHeader) UnmarshalJSON(data []byte) error {
var ok bool
var v interface{}
if err := json.Unmarshal(data, &v); err != nil {
return err
}
arr, ok := v.([]interface{})
if !ok {
return errInvalidSyntheticsJSON
}
if len(arr) != 5 {
return errUnexpectedArraySize{
label: "unexpected number of application data elements",
expected: 5,
actual: len(arr),
}
}
version, ok := arr[0].(float64)
if !ok {
return errInvalidSyntheticsVersion
}
s.Version = int(version)
if s.Version != 1 {
return errUnexpectedSyntheticsVersion(s.Version)
}
accountID, ok := arr[1].(float64)
if !ok {
return errInvalidSyntheticsAccountID
}
s.AccountID = int(accountID)
if s.ResourceID, ok = arr[2].(string); !ok {
return errInvalidSyntheticsResourceID
}
if s.JobID, ok = arr[3].(string); !ok {
return errInvalidSyntheticsJobID
}
if s.MonitorID, ok = arr[4].(string); !ok {
return errInvalidSyntheticsMonitorID
}
return nil
}
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