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exec_env.go
executable file
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exec_env.go
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package types
import (
"github.com/bandprotocol/go-owasm/api"
)
// BaseEnv combines shared functions used in prepare and execution Owasm program,
type BaseEnv struct {
request Request
}
// GetCalldata implements Owasm ExecEnv interface.
func (env *BaseEnv) GetCalldata() []byte {
return env.request.Calldata
}
// SetReturnData implements Owasm ExecEnv interface.
func (env *BaseEnv) SetReturnData(data []byte) error {
return api.ErrWrongPeriodAction
}
// GetAskCount implements Owasm ExecEnv interface.
func (env *BaseEnv) GetAskCount() int64 {
return int64(len(env.request.RequestedValidators))
}
// GetMinCount implements Owasm ExecEnv interface.
func (env *BaseEnv) GetMinCount() int64 {
return int64(env.request.MinCount)
}
// GetAnsCount implements Owasm ExecEnv interface.
func (env *BaseEnv) GetAnsCount() (int64, error) {
return 0, api.ErrWrongPeriodAction
}
// AskExternalData implements Owasm ExecEnv interface.
func (env *BaseEnv) AskExternalData(eid int64, did int64, data []byte) error {
return api.ErrWrongPeriodAction
}
// GetExternalDataStatus implements Owasm ExecEnv interface.
func (env *BaseEnv) GetExternalDataStatus(eid int64, vid int64) (int64, error) {
return 0, api.ErrWrongPeriodAction
}
// GetExternalData implements Owasm ExecEnv interface.
func (env *BaseEnv) GetExternalData(eid int64, vid int64) ([]byte, error) {
return nil, api.ErrWrongPeriodAction
}
// PrepareEnv implements ExecEnv interface only expected function and panic on non-prepare functions.
type PrepareEnv struct {
BaseEnv
maxRawRequests int64
maxDataSize int64
rawRequests []RawRequest
}
// NewPrepareEnv creates a new environment instance for prepare period.
func NewPrepareEnv(req Request, maxRawRequests, maxDataSize int64) *PrepareEnv {
return &PrepareEnv{
BaseEnv: BaseEnv{
request: req,
},
maxRawRequests: maxRawRequests,
maxDataSize: maxDataSize,
}
}
// AskExternalData implements Owasm ExecEnv interface.
func (env *PrepareEnv) AskExternalData(eid int64, did int64, data []byte) error {
if int64(len(data)) > env.maxDataSize {
return api.ErrSpanTooSmall
}
if int64(len(env.rawRequests)) >= env.maxRawRequests {
return api.ErrTooManyExternalData
}
for _, raw := range env.rawRequests {
if raw.ExternalID == ExternalID(eid) {
return api.ErrDuplicateExternalID
}
}
env.rawRequests = append(env.rawRequests, NewRawRequest(
ExternalID(eid), DataSourceID(did), data,
))
return nil
}
// GetRawRequests returns the list of raw requests made during Owasm prepare run.
func (env *PrepareEnv) GetRawRequests() []RawRequest {
return env.rawRequests
}
// ExecuteEnv implements ExecEnv interface only expected function and panic on prepare related functions.
type ExecuteEnv struct {
BaseEnv
reports map[string]map[ExternalID]RawReport
Retdata []byte
}
// NewExecuteEnv creates a new environment instance for execution period.
func NewExecuteEnv(req Request, reports []Report) *ExecuteEnv {
envReports := make(map[string]map[ExternalID]RawReport)
for _, report := range reports {
valReports := make(map[ExternalID]RawReport)
for _, each := range report.RawReports {
valReports[each.ExternalID] = each
}
envReports[report.Validator] = valReports
}
return &ExecuteEnv{
BaseEnv: BaseEnv{
request: req,
},
reports: envReports,
}
}
// GetAnsCount implements Owasm ExecEnv interface.
func (env *ExecuteEnv) GetAnsCount() (int64, error) {
return int64(len(env.reports)), nil
}
// SetReturnData implements Owasm ExecEnv interface.
func (env *ExecuteEnv) SetReturnData(data []byte) error {
if env.Retdata != nil {
return api.ErrRepeatSetReturnData
}
env.Retdata = data
return nil
}
func (env *ExecuteEnv) getExternalDataFull(eid int64, valIdx int64) ([]byte, int64, error) {
if valIdx < 0 || valIdx >= int64(len(env.request.RequestedValidators)) {
return nil, 0, api.ErrBadValidatorIndex
}
valAddr := env.request.RequestedValidators[valIdx]
valReports, ok := env.reports[valAddr]
if !ok {
return nil, -1, nil
}
valReport, ok := valReports[ExternalID(eid)]
if !ok {
return nil, 0, api.ErrBadExternalID
}
return valReport.Data, int64(valReport.ExitCode), nil
}
// GetExternalDataStatus implements Owasm ExecEnv interface.
func (env *ExecuteEnv) GetExternalDataStatus(eid int64, vid int64) (int64, error) {
_, status, err := env.getExternalDataFull(eid, vid)
return status, err
}
// GetExternalData implements Owasm ExecEnv interface.
func (env *ExecuteEnv) GetExternalData(eid int64, vid int64) ([]byte, error) {
data, _, err := env.getExternalDataFull(eid, vid)
return data, err
}