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job.go
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job.go
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// Copyright 2020 Coinbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package job
import (
"context"
"errors"
"fmt"
"math/big"
"github.com/coinbase/rosetta-sdk-go/types"
"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
)
// New creates a new *Job.
func New(workflow *Workflow) *Job {
return &Job{
Workflow: workflow.Name,
Status: Ready,
// We don't need to copy scenarios here because we never
// alter scenarios during runtime.
Scenarios: workflow.Scenarios,
}
}
// CreateBroadcast returns a *Broadcast for a given job or
// nil if none is required.
func (j *Job) CreateBroadcast() (*Broadcast, error) {
// ProcessNextScenario will increment the index, so we need to subtract
// by 1 when attempting to create a broadcast payload.
broadcastIndex := j.Index - 1
if broadcastIndex < 0 {
return nil, ErrUnableToCreateBroadcast
}
scenario := j.Scenarios[broadcastIndex]
var operations []*types.Operation
err := j.unmarshalStruct(scenario.Name, Operations, &operations)
if errors.Is(err, ErrVariableNotFound) {
// If <scenario.Name>.operations are not provided, no broadcast
// is required.
if j.CheckComplete() {
j.Status = Completed
}
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("%w: %s", ErrOperationFormat, err.Error())
}
confirmationDepth, err := j.unmarshalNumber(scenario.Name, ConfirmationDepth)
if err != nil {
return nil, fmt.Errorf("%w: %s", ErrConfirmationDepthInvalid, err.Error())
}
var network types.NetworkIdentifier
err = j.unmarshalStruct(scenario.Name, Network, &network)
if err != nil {
return nil, fmt.Errorf("%w: %s", ErrNetworkInvalid, err.Error())
}
var metadata map[string]interface{}
err = j.unmarshalStruct(scenario.Name, PreprocessMetadata, &metadata)
if err != nil && !errors.Is(err, ErrVariableNotFound) {
return nil, fmt.Errorf("%w: %s", ErrMetadataInvalid, err.Error())
}
j.Status = Broadcasting
return &Broadcast{
Network: &network,
Intent: operations,
Metadata: metadata,
ConfirmationDepth: confirmationDepth.Int64(),
}, nil
}
func (j *Job) unmarshalNumber(
scenarioName string,
reservedVariable ReservedVariable,
) (*big.Int, error) {
variable := fmt.Sprintf("%s.%s", scenarioName, reservedVariable)
value := gjson.Get(j.State, variable)
if !value.Exists() {
return nil, ErrVariableNotFound
}
i, ok := new(big.Int).SetString(value.String(), 10)
if !ok {
return nil, ErrVariableIncorrectFormat
}
return i, nil
}
func (j *Job) unmarshalStruct(
scenarioName string,
reservedVariable ReservedVariable,
output interface{},
) error {
variable := fmt.Sprintf("%s.%s", scenarioName, reservedVariable)
value := gjson.Get(j.State, variable)
if !value.Exists() {
return ErrVariableNotFound
}
return UnmarshalInput([]byte(value.Raw), output)
}
// CheckComplete returns a boolean indicating
// if a job is complete.
func (j *Job) CheckComplete() bool {
return j.Index > len(j.Scenarios)-1
}
// BroadcastComplete is called either after a broadcast
// has been confirmed at the provided confirmation depth or
// if it has failed for some reason.
func (j *Job) BroadcastComplete(
ctx context.Context,
transaction *types.Transaction,
) error {
if j.Status != Broadcasting {
return fmt.Errorf("%w: job is in %s state", ErrUnableToHandleBroadcast, j.State)
}
if transaction == nil {
j.Status = Failed
return nil
}
broadcastIndex := j.Index - 1
if broadcastIndex < 0 {
return fmt.Errorf("%w: no broadcast to confirm", ErrUnableToHandleBroadcast)
}
scenario := j.Scenarios[broadcastIndex]
// Store transaction in state
transactionKey := fmt.Sprintf("%s.%s", scenario.Name, Transaction)
newState, err := sjson.SetRaw(
j.State,
transactionKey,
types.PrintStruct(transaction),
)
if err != nil {
return fmt.Errorf(
"%w: unable to store transaction result in state %s",
ErrUnableToHandleBroadcast,
err,
)
}
j.State = newState
if j.CheckComplete() {
j.Status = Completed
return nil
}
j.Status = Ready
return nil
}