113 lines
4.0 KiB
Go
113 lines
4.0 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package command
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"time"
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"github.com/camunda/zeebe/clients/go/v8/pkg/commands"
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"github.com/dapr/components-contrib/bindings"
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"github.com/dapr/kit/metadata"
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)
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var (
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ErrAmbiguousCreationVars = errors.New("either 'bpmnProcessId' or 'processDefinitionKey' must be passed, not both at the same time")
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ErrMissingCreationVars = errors.New("either 'bpmnProcessId' or 'processDefinitionKey' must be passed")
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)
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type createInstancePayload struct {
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BpmnProcessID string `json:"bpmnProcessId"`
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ProcessDefinitionKey *int64 `json:"processDefinitionKey"`
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Version *int32 `json:"version"`
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Variables interface{} `json:"variables"`
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WithResult bool `json:"withResult"`
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FetchVariables []string `json:"fetchVariables"`
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RequestTimeout *metadata.Duration `json:"requestTimeout,omitempty"`
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}
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func (z *ZeebeCommand) createInstance(ctx context.Context, req *bindings.InvokeRequest) (*bindings.InvokeResponse, error) {
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var payload createInstancePayload
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err := json.Unmarshal(req.Data, &payload)
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if err != nil {
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return nil, err
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}
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cmd1 := z.client.NewCreateInstanceCommand()
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var cmd2 commands.CreateInstanceCommandStep2
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var cmd3 commands.CreateInstanceCommandStep3
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var errorDetail string
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if payload.BpmnProcessID != "" { //nolint:nestif
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if payload.ProcessDefinitionKey != nil {
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return nil, ErrAmbiguousCreationVars
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}
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cmd2 = cmd1.BPMNProcessId(payload.BpmnProcessID)
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if payload.Version != nil {
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cmd3 = cmd2.Version(*payload.Version)
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errorDetail = fmt.Sprintf("bpmnProcessId %s and version %d", payload.BpmnProcessID, payload.Version)
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} else {
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cmd3 = cmd2.LatestVersion()
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errorDetail = fmt.Sprintf("bpmnProcessId %s and lates version", payload.BpmnProcessID)
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}
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} else if payload.ProcessDefinitionKey != nil {
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cmd3 = cmd1.ProcessDefinitionKey(*payload.ProcessDefinitionKey)
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errorDetail = fmt.Sprintf("processDefinitionKey %d", payload.ProcessDefinitionKey)
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} else {
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return nil, ErrMissingCreationVars
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}
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if payload.Variables != nil {
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cmd3, err = cmd3.VariablesFromObject(payload.Variables)
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if err != nil {
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return nil, err
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}
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}
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var response interface{}
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// The request timeout has only an affect if WithResult is used. Using WithResult means that the operation is
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// synchronous instead of asynchronous, and the request timeout defines how long the client should wait for the
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// workflow/process to finish to get the result.
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//
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// From a code perspective, there are two Send methods in the Zeebe client. One if WithResult was used and
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// which extracts the request timeout from the context and another one which will not use any timeout.
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if payload.WithResult && payload.RequestTimeout != nil && payload.RequestTimeout.Duration != time.Duration(0) {
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ctxWithTimeout, cancel := context.WithTimeout(ctx, payload.RequestTimeout.Duration)
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defer cancel()
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response, err = cmd3.WithResult().FetchVariables(payload.FetchVariables...).Send(ctxWithTimeout)
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} else if payload.WithResult {
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response, err = cmd3.WithResult().FetchVariables(payload.FetchVariables...).Send(ctx)
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} else {
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response, err = cmd3.Send(ctx)
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}
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if err != nil {
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return nil, fmt.Errorf("cannot create instance for %s: %w", errorDetail, err)
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}
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jsonResponse, err := json.Marshal(response)
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if err != nil {
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return nil, fmt.Errorf("cannot marshal response to json: %w", err)
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}
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return &bindings.InvokeResponse{
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Data: jsonResponse,
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}, nil
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}
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