Add CRUD operations for Problems #3
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,154 @@ | ||
| package dbOperations | ||
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| import ( | ||
| "errors" | ||
| "fmt" | ||
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| gremcos "github.com/supplyon/gremcos" | ||
| "github.com/supplyon/gremcos/api" | ||
| "github.com/supplyon/gremcos/interfaces" | ||
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| modelStorage "github.com/imeplusplus/dont-panic-api/app/modelStorage" | ||
| ) | ||
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| func CreateProblem(cosmos gremcos.Cosmos, problem modelStorage.Problem) (modelStorage.Problem, error) { | ||
| _, err := GetProblemByName(cosmos, problem.Name) | ||
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| if err == nil { | ||
| return modelStorage.Problem{}, fmt.Errorf("there is already a problem with name %v", problem.Name) | ||
|
There was a problem hiding this comment. minor: consider using typed errors, as they might make your functions easier to test and to reuse the error for other use cases: type MyAwesomeError struct {
SomeField string
}
func (e MyAwesomeError) Error() string {
return fmt.Errorf("some error occurred and the field is %s", e.SomeField)
}
func (e MyAwesomeError) Is(err error) bool {
_, ok := err.(MyAwesomeError)
return ok
}There was a problem hiding this comment. I added the tips to our notes so we can learn about them and replace in the code =] |
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| } | ||
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| g := api.NewGraph("g") | ||
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| query := g.AddV("problem").Property("partitionKey", "problem") | ||
| query = addProblemVertexProperties(query, problem) | ||
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| res, err := cosmos.ExecuteQuery(query) | ||
| if err != nil { | ||
| fmt.Println("Failed to execute a gremlin command", query.String()) | ||
| return problem, err | ||
|
There was a problem hiding this comment. another tip here that might improve debugability: the final error returns "loading some stuff: some stuff happened" |
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| } | ||
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| problems, err := getProblemsFromResponse(res) | ||
| if len(problems) == 0 { | ||
| return modelStorage.Problem{}, err | ||
| } | ||
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| return problems[0], err | ||
| } | ||
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| func GetProblems(cosmos gremcos.Cosmos) ([]modelStorage.Problem, error) { | ||
| g := api.NewGraph("g") | ||
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| query := g.V().HasLabel("problem") | ||
| res, err := cosmos.ExecuteQuery(query) | ||
| if err != nil { | ||
| fmt.Println("Failed to execute a gremlin command", query.String()) | ||
| return nil, err | ||
| } | ||
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| return getProblemsFromResponse(res) | ||
| } | ||
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| func GetProblemByName(cosmos gremcos.Cosmos, name string) (modelStorage.Problem, error) { | ||
| var problem modelStorage.Problem | ||
| g := api.NewGraph("g") | ||
| query := g.V().HasLabel("problem").Has("name", name) | ||
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| res, err := cosmos.ExecuteQuery(query) | ||
| if err != nil { | ||
| fmt.Println("Failed to execute a gremlin command", query.String()) | ||
| return problem, err | ||
| } | ||
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| problems, err := getProblemsFromResponse(res) | ||
| if len(problems) == 0 { | ||
| return modelStorage.Problem{}, err | ||
| } | ||
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| return problems[0], err | ||
| } | ||
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| func UpdateProblem(cosmos gremcos.Cosmos, problem modelStorage.Problem, name string) (modelStorage.Problem, error) { | ||
| if problem.Name != name { | ||
| _, err := GetProblemByName(cosmos, problem.Name) | ||
| if err == nil { | ||
| return modelStorage.Problem{}, fmt.Errorf("there is already a problem with name %v. can't rename in this case", problem.Name) | ||
| } | ||
| } | ||
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| oldProblem, err := GetProblemByName(cosmos, name) | ||
| if err != nil { | ||
| return oldProblem, fmt.Errorf("there is no problem with name '%v' to update in the database", name) | ||
| } | ||
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| g := api.NewGraph("g") | ||
| query := addProblemVertexProperties(g.VByStr(oldProblem.Id), problem) | ||
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| res, err := cosmos.ExecuteQuery(query) | ||
| if err != nil { | ||
| fmt.Println("Failed to execute a gremlin command", query.String()) | ||
| return problem, err | ||
| } | ||
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| problems, err := getProblemsFromResponse(res) | ||
| if len(problems) == 0 { | ||
| return modelStorage.Problem{}, err | ||
| } | ||
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| return problems[0], err | ||
| } | ||
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| func DeleteProblem(cosmos gremcos.Cosmos, name string) error { | ||
| _, err := GetProblemByName(cosmos, name) | ||
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| if err != nil { | ||
| return fmt.Errorf("there is no problem with name '%v' to delete in the database", name) | ||
| } | ||
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| g := api.NewGraph("g") | ||
| query := g.V().HasLabel("problem").Has("name", name).Drop() | ||
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| _, err = cosmos.ExecuteQuery(query) | ||
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| return err | ||
| } | ||
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| func addProblemVertexProperties(vertex interfaces.Vertex, problem modelStorage.Problem) interfaces.Vertex { | ||
| vertex = vertex. | ||
| Property("name", problem.Name). | ||
| Property("difficulty", problem.Difficulty). | ||
| Property("link", problem.Link) | ||
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| return vertex | ||
| } | ||
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| func getProblemsFromResponse(res []interfaces.Response) ([]modelStorage.Problem, error) { | ||
| var problems []modelStorage.Problem | ||
| response := api.ResponseArray(res) | ||
| vertices, _ := response.ToVertices() | ||
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| if len(vertices) == 0 { | ||
| return problems, errors.New("there is no data with type 'api.vertex' in the response. the graph query didn't return any vertex") | ||
| } | ||
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| for _, v := range vertices { | ||
| problems = append(problems, vertexToProblem(v)) | ||
| } | ||
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| return problems, nil | ||
| } | ||
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| func vertexToProblem(vertex api.Vertex) modelStorage.Problem { | ||
| var problem modelStorage.Problem | ||
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| problem.Id = vertex.ID | ||
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| properties := vertex.Properties | ||
| problem.Name = properties["name"][0].Value.AsString() | ||
| problem.Difficulty = int(properties["difficulty"][0].Value.AsInt32()) | ||
| problem.Link = properties["link"][0].Value.AsString() | ||
| problem.PartitionKey = properties["partitionKey"][0].Value.AsString() | ||
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| return problem | ||
| } | ||
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