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https://github.com/dillonkearns/elm-pages-v3-beta.git
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Handle port-data-source errors in BackendTasks.
This commit is contained in:
Dillon Kearns
parent
4146ed1a11
commit
a2a558992a
@ -75,20 +75,60 @@ function lookupOrPerform(portsFile, mode, rawRequest, hasFsAccess, useCache) {
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if (!portBackendTask[portName]) {
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if (portBackendTaskImportError === null) {
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throw `BackendTask.Port.send "${portName}" was called, but I couldn't find a function with that name in the port definitions file. Is it exported correctly?`;
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resolve({
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kind: "response-json",
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value: jsonResponse({
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"elm-pages-internal-error": "PortNotDefined",
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}),
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});
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} else if (portBackendTaskImportError === "missing") {
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throw `BackendTask.Port.send "${portName}" was called, but I couldn't find the port definitions file. Be sure to create a 'port-data-source.ts' or 'port-data-source.js' file and maybe restart the dev server.`;
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resolve({
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kind: "response-json",
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value: jsonResponse({
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"elm-pages-internal-error": "MissingPortsFile",
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}),
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});
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} else {
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throw `BackendTask.Port.send "${portName}" was called, but I couldn't import the port definitions file, because of this exception: \`${portBackendTaskImportError}\` Are there syntax errors or expections thrown during import?`;
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resolve({
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kind: "response-json",
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value: jsonResponse({
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"elm-pages-internal-error": "ErrorInPortsFile",
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error:
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(portBackendTaskImportError &&
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portBackendTaskImportError.stack) ||
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"",
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}),
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});
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}
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} else if (typeof portBackendTask[portName] !== "function") {
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throw `BackendTask.Port.send "${portName}" was called, but it is not a function. Be sure to export a function with that name from port-data-source.js`;
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resolve({
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kind: "response-json",
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value: jsonResponse({
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"elm-pages-internal-error": "ExportIsNotFunction",
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error: typeof portBackendTask[portName],
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}),
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});
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} else {
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try {
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const portFunctionResult = await portBackendTask[portName](input);
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await fs.promises.writeFile(
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responsePath,
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JSON.stringify(jsonResponse(portFunctionResult))
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);
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resolve({
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kind: "cache-response-path",
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value: responsePath,
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});
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} catch (portCallError) {
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resolve({
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kind: "response-json",
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value: jsonResponse({
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"elm-pages-internal-error": "PortCallError",
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error: portCallError,
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}),
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});
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}
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}
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await fs.promises.writeFile(
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responsePath,
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JSON.stringify(jsonResponse(await portBackendTask[portName](input)))
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);
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resolve({ kind: "cache-response-path", value: responsePath });
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} catch (error) {
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console.trace(error);
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reject({
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@ -15,7 +15,7 @@ import BackendTask
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import BackendTask.Http
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import BackendTask.Internal.Request
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import Exception exposing (Catchable)
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import Json.Decode exposing (Decoder)
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import Json.Decode as Decode exposing (Decoder)
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import Json.Encode as Encode
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import TerminalText
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@ -92,24 +92,111 @@ get portName input decoder =
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]
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|> BackendTask.Http.jsonBody
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, expect =
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decoder
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Decode.oneOf
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[ Decode.field "elm-pages-internal-error" Decode.string
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|> Decode.andThen
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(\errorKind ->
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if errorKind == "PortNotDefined" then
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Exception.Catchable (PortNotDefined { name = portName })
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I expected to find a port named `"
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, TerminalText.yellow portName
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, TerminalText.text "` but I couldn't find it. Is the function exported in your port-data-source file?"
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]
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|> TerminalText.toString
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}
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|> Decode.succeed
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else if errorKind == "ExportIsNotFunction" then
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Decode.field "error" Decode.string
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|> Decode.maybe
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|> Decode.map (Maybe.withDefault "")
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|> Decode.map
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(\incorrectPortType ->
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Exception.Catchable ExportIsNotFunction
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I found an export called `"
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, TerminalText.yellow portName
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, TerminalText.text "` but I expected its type to be function, but instead its type was: "
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, TerminalText.red incorrectPortType
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]
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|> TerminalText.toString
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}
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)
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else if errorKind == "MissingPortsFile" then
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Exception.Catchable MissingPortsFile
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I couldn't find your port-data-source file. Be sure to create a 'port-data-source.ts' or 'port-data-source.js' file."
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]
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|> TerminalText.toString
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}
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|> Decode.succeed
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else if errorKind == "ErrorInPortsFile" then
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Decode.field "error" Decode.string
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|> Decode.maybe
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|> Decode.map (Maybe.withDefault "")
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|> Decode.map
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(\errorMessage ->
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Exception.Catchable
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ErrorInPortsFile
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I couldn't import the port definitions file, because of this exception:\n\n"
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, TerminalText.red errorMessage
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, TerminalText.text "\n\nAre there syntax errors or exceptions thrown during import?"
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]
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|> TerminalText.toString
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}
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)
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else if errorKind == "PortCallError" then
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Decode.field "error" Decode.value
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|> Decode.maybe
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|> Decode.map (Maybe.withDefault Encode.null)
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|> Decode.map
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(\portCallError ->
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Exception.Catchable
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(PortCallError portCallError)
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I couldn't import the port definitions file, because of this exception:\n\n"
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, TerminalText.red (Encode.encode 2 portCallError)
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, TerminalText.text "\n\nAre there syntax errors or exceptions thrown during import?"
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]
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|> TerminalText.toString
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}
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)
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else
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Exception.Catchable ErrorInPortsFile
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get. I expected to find a port named `"
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, TerminalText.yellow portName
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, TerminalText.text "`."
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]
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|> TerminalText.toString
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}
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|> Decode.succeed
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)
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|> Decode.map Err
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, decoder |> Decode.map Ok
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]
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|> BackendTask.Http.expectJson
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}
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|> BackendTask.onError
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(\_ ->
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BackendTask.fail
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(Exception.Catchable Error
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{ title = "Port Error"
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, body =
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[ TerminalText.text "Something went wrong in a call to BackendTask.Port.get."
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]
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|> TerminalText.toString
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}
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)
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)
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|> BackendTask.andThen BackendTask.fromResult
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{-| -}
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type Error
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= -- TODO include additional context about error or better name to reflect the error state
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Error
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= Error
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| ErrorInPortsFile
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| MissingPortsFile
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| PortNotDefined { name : String }
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| PortCallError Decode.Value
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| ExportIsNotFunction
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