@fmal/http-service

A HTTP service - originally @cerebral/http

Migrating from @cerebral/http? See the migration guide at the bottom of this readme.

Install

npm install @fmal/http-service

Description

http-service exposes the ability to do HTTP requests. It supports cors and file upload, with progress handling. It defaults to json, but you can configure it to whatever you want.

http-service works great with Cerebral (with Cerebral-specific factories exposed) but the service itself (default export) does not depend on Cerebral, so you are free to use it in other contexts.

import { set } from 'cerebral/factories';
import { httpGet } from '@fmal/http-service/factories';
import { state, props, string } from 'cerebral';

export default [
  httpGet(string`/items/${props`itemKey`}`),
  set(state`app.currentItem`, props`result`)
];

All factories of HTTP service supports template tags.

Instantiate

import App, { Provider } from 'cerebral';
import HttpService from '@fmal/http-service';

const http = Provider(
  HttpService({
    // Prefix all requests with this url
    baseUrl: 'https://api.github.com',

    // Any default headers to pass on requests
    headers: {
      'Content-Type': 'application/json; charset=UTF-8',
      Accept: 'application/json'
    },

    // When talking to cross origin (cors), pass cookies
    // if set to true
    withCredentials: false,

    // Provide a global request timeout for all calls
    // which can be overwritten for request by providing
    // a different timeout when doing a request
    // in actions or factories
    timeout: 5000
  })
);

const app = App({
  providers: { http }
});

You can update these default options in an action:

function updateDefaultHttpOptions({ http }) {
  http.updateOptions({
    // Updated options
  });
}

abort

You can abort any running request, causing the request to resolve as status code 0 and sets the type to abort on the error object.

function searchItems({ props, path, http }) {
  http.abort('/items*'); // regexp string
  return http
    .get(`/items?query=${props.query}`)
    .then(path.success)
    .catch(error => {
      if (error.type === 'abort') {
        return path.abort();
      }

      return path.error({ error });
    });
}

export default [
  searchItems,
  {
    success: [],
    error: [],
    abort: []
  }
];

cors

Cors has been turned into a "black box" by jQuery. Cors is actually a very simple concept, but due to a lot of confusion of "Request not allowed", cors has been an option to help out. In HttpService we try to give you the insight to understand how cors actually works.

Cors has nothing to do with the client. The only client configuration related to cors is the withCredentials option, which makes sure cookies are passed to the cross origin server. The only requirement for cors to work is that you pass the correct Content-Type. Now, this depends on the server in question. Some servers allows any content-type, others require a specific one. These are the typical ones:

text/plain
application/x-www-form-urlencoded
application/json; charset=UTF-8

Note that this is only related to the request. If you want to define what you want as response, you set the Accept header, which is application/json by default.

errors

HttpServiceError

import { HttpServiceError } from '@fmal/http-service';

// Error structure
{
  name: 'HttpServiceError',
  type: 'http | abort | timeout',
  message: 'Some error message or responseText',
  response: {
    result: {}, // Parsed responseText
    headers: {},
    status: 200
  },
  stack: '...'
}

This error is available in the following scenarios:

Inside an action

function someAction({ http }) {
  return http.get('/something').catch(error => ...)
}

Going down an error path

[
  httpGet('/something'),
  {
    success: [],
    error: [
      // {error: ...}
    ]
  }
];

To module catch handlers

const errorCatched = [
  // {error: ...}
  displayError
];

const module = {
  catch: [[HttpServiceError, errorCatched]]
};

delete

action

function someDeleteAction({ http }) {
  const query = {};
  const options = {};

  return http
    .delete('/items/1', query, options)
    .then(response => {
      return { response };
    })
    .catch(error => {
      return { error };
    });
}

factory

import { httpDelete } from '@fmal/http-service/factories';
import { state, string } from 'cerebral';

export default [
  httpDelete(string`/items/${state`currentItemId`}`)
  /*
    PROPS: {
      response: {...}
    }
  */
];

factory with paths

import { httpDelete } from '@cerebral/http/factories';
import { state, string } from 'cerebral';

export default [
  httpDelete(string`/items/${state`currentItemId`}`),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],
    timeout: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

get

action

function someGetAction({ http }) {
  const query = {};
  const options = {};

  return http
    .get('/items', query, options)
    .then(response => {
      return { someResponse: response };
    })
    .catch(error => {
      return { someError: error };
    });
}

factory

import { httpGet } from '@fmal/http-service/factories';

export default [
  httpGet('/items')
  /*
    PROPS: {
      response: {...}
    }
  */
];

On error this will throw to the signal or global catch handler.

factory with paths

import { httpGet } from '@fmal/http-service/factories';

export default [
  httpGet('/items'),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],
    timeout: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

patch

action

function somePatchAction({ http }) {
  const data = {};
  const options = {};

  return http
    .patch('/items/1', data, options)
    .then(response => {
      return { response };
    })
    .catch(error => {
      return { error };
    });
}

factory

import { httpPatch } from '@fmal/http-service/factories';
import { state, props, string } from 'cerebral';

export default [
  httpPatch(string`/items/${props`itemId`}`, state`patchData`)
  /*
    PROPS: {
      response: {...}
    }
  */
];

factory with paths

import { httpPatch } from '@fmal/http-service/factories';
import { state, props, string } from 'cerebral';

export default [
  httpPatch(string`/items/${props`itemId`}`, state`patchData`),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],
    timeout: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

post

action

function somePostAction({ http }) {
  const data = {};
  const options = {};

  return http
    .post('/items', data, options)
    .then(response => {
      return { response };
    })
    .catch(error => {
      return { error };
    });
}

factory

import { httpPost } from '@fmal/http-service/factories';
import { props } from 'cerebral';

export default [
  httpPost('/items', {
    title: props`itemTitle`,
    foo: 'bar'
  })
  /*
    PROPS: {
      response: {...}
    }
  */
];

factory with paths

import { httpPost } from '@fmal/http-service/factories';
import { props } from 'cerebral';

export default [
  httpPost('/items', {
    title: props`itemTitle`,
    foo: 'bar'
  }),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],
    timeout: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

put

action

function somePutAction({ http }) {
  const data = {};
  const options = {};

  return http
    .put('/items/1', data, options)
    .then(response => {
      return { response };
    })
    .catch(error => {
      return { error };
    });
}

factory

import { httpPut } from '@fmal/http-service/factories';

export default [
  httpPut('/items', {
    // data object
  })
  /*
    PROPS: {
      response: {...}
    }
  */
];

factory with paths

import { httpPut } from '@fmal/http-service/factories';

export default [
  httpPut('/items', {
    // data object
  }),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],
    timeout: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

responses

There are two types of responses from the HTTP service. A response and an error of type HttpServiceError. A response will be received on status codes 200-299. Everything else is an error.

response

{
  result: 'the response body',
  headers: {...},
  status: 200
}

error

{
  name: 'HttpServiceError',
  type: 'http | abort | timeout',
  message: 'Some potential error message',
  result: 'Message or response body',
  status: 500,
  headers: {},
  stack: '...'
}

request

function someGetAction ({http}) {
  return http.request({
    // Any http method
    method: 'GET',

    // Url you want to request to
    url: '/items'

    // Request body as object. Will automatically be stringified if json and
    // urlEncoded if application/x-www-form-urlencoded
    body: {},

    // Query as object, will automatically be urlEncoded
    query: {},

    // If cross origin request, pass cookies
    withCredentials: false,

    // Any additional http headers, or overwrite default
    headers: {},

    // A function or signal path (foo.bar.requestProgressed) that
    // triggers on request progress. Passes {progress: 45} etc.
    onProgress: null
  })
}

uploadFile

action

function someDeleteAction({ http, props }) {
  return http
    .uploadFile('/upload', props.files, {
      name: 'filename.png', // Default to "files"
      data: {}, // Additional form data
      headers: {},
      onProgress: 'some.signal.path' // Upload progress
    })
    .then(response => {
      return { response };
    })
    .catch(error => {
      return { error };
    });
}

factory

import { httpUploadFile } from '@fmal/http-service/factories';
import { state, props } from 'cerebral';

export default [
  httpUploadFile('/uploads', props`file`, {
    name: state`currentFileName`
  }),
  {
    success: [
      /* PROPS: {response: {...}} */
    ],
    error: [
      /* PROPS: {error: {...}} */
    ],
    abort: [
      /* PROPS: {error: {...}} */
    ],

    // Optionally any status code, ex. 404: []
    '${STATUS_CODE}': [
      /* PROPS: {response/error: {...}} */
    ]
  }
];

factory with paths

import { httpUploadFile } from '@fmal/http-service/factories';
import { state, props } from 'cerebral/tags';

export default [
  httpUploadFile('/uploads', props`file`, {
    name: state`currentFileName`
  })
  /*
    PROPS: {
      response: {...}
    }
  */
];

Migrating from @cerebral/http

Since http-service does not depend on Cerebral it does not use Provider, but you can wrap http-service in Provider for the same effect:

-import { Controller, Module } from 'cerebral';
-import HttpProvider from '@cerebral/http';
+import App, { Provider } from 'cerebral';
+import HttpService from '@fmal/http-service';

-export default Controller(
-  Module({
-    providers: {
-      http: HttpProvider({})
-    }
-  })
-);
+export default App({
+  providers: {
+    http: Provider(HttpService({}))
+  }
+});

http-service uses HttpServiceError error instead of HttpProviderError:

-import { HttpProviderError } from '@cerebral/http';
+import { HttpServiceError } from '@fmal/http-service';

“operators” are changed with “factories”, to follow the naming introduced in Cerebral 5.0. Factories are exported under @fmal/http-service/factories and they are optional, meaning if you're using http-service outside Cerebral app, you don't have to import (and thus bundle) them in your codebase.

-import { httpGet } from '@cerebral/http/operators';
+import { httpGet } from '@fmal/http-service/factories';