|
| 1 | +algorithmia.js |
| 2 | +============== |
| 3 | + |
| 4 | +A nodejs library for calling algorithms on Algorithmia.com with partial support for the DataAPI |
| 5 | + |
| 6 | +[]() |
| 7 | + |
| 8 | +## Getting started |
| 9 | + |
| 10 | +The official Algorithmia nodejs client is available on NPM. |
| 11 | +Install it for your project by adding `algorithmia` to your package.json: |
| 12 | + |
| 13 | +```bash |
| 14 | +npm install --save algorithmia |
| 15 | +``` |
| 16 | + |
| 17 | +Then instantiate an Algorithmia client using your API key: |
| 18 | + |
| 19 | +```javascript |
| 20 | +var algorithmia = require("algorithmia"); |
| 21 | + |
| 22 | +var client = algorithmia(process.env.ALGORITHMIA_API_KEY); |
| 23 | +``` |
| 24 | + |
| 25 | +Now you are ready to call algorithms. |
| 26 | + |
| 27 | +## Calling algorithms |
| 28 | + |
| 29 | +The following examples of calling algorithms are organized by type of input/output which vary between algorithms. |
| 30 | + |
| 31 | +Note: a single algorithm may have different input and output types, or accept multiple types of input, so consult the algorithm's description for usage examples specific to that algorithm. |
| 32 | + |
| 33 | +### Text input/output |
| 34 | + |
| 35 | +Call an algorithm with text input by passing a string into the `pipe` method. |
| 36 | +The returned promise will be called with the response with the Algorithm completes (or when an error occurs). |
| 37 | +If the algorithm output is text, then the `get()` method on the response will return a string. |
| 38 | + |
| 39 | +```javascript |
| 40 | +client.algo("algo://demo/Hello/0.1.1") |
| 41 | + .pipe("HAL 9000") |
| 42 | + .then(function(response) { |
| 43 | + console.log(response.get()); |
| 44 | + }); |
| 45 | +// -> Hello HAL 9000 |
| 46 | +``` |
| 47 | + |
| 48 | +### JSON input/output |
| 49 | + |
| 50 | +Call an algorithm with JSON input by passing in a native JavaScript type; |
| 51 | +most of the time this will be an `Object` or an `Array` (though `Boolean`, `Number`, and `Null` are possible). |
| 52 | +Similarly, if the algorithm response is JSON, the `get()` method will return the appropriate native JavaScript type. |
| 53 | + |
| 54 | +```javascript |
| 55 | +client.algo("algo://WebPredict/ListAnagrams/0.1.0") |
| 56 | + .pipe(["transformer", "terraforms", "retransform"]) |
| 57 | + .then(function(response) { |
| 58 | + console.log(response.get()); |
| 59 | + // -> ["transformer","retransform"] |
| 60 | + }); |
| 61 | +``` |
| 62 | + |
| 63 | +Alternatively, if you already have serialized JSON, you can call `pipeJson` with the raw JSON string. |
| 64 | +The following example makes the same API call as the previous example: |
| 65 | + |
| 66 | +```javascript |
| 67 | +client.algo("algo://WebPredict/ListAnagrams/0.1.0") |
| 68 | + .pipeJson('["transformer", "terraforms", "retransform"]') |
| 69 | +``` |
| 70 | + |
| 71 | +### Binary input/output |
| 72 | + |
| 73 | +Call an algorithm with binary input by passing a `Buffer` into the pipe method. |
| 74 | +Similarly, if the algorithm response is binary data, then the `get` method on the response will be a byte array. |
| 75 | + |
| 76 | +```javascript |
| 77 | +var buffer = fs.readFileSync("/path/to/bender.jpg"); |
| 78 | +client.algo("opencv/SmartThumbnail") |
| 79 | + .pipe(buffer) |
| 80 | + .then(function(response) { |
| 81 | + var buffer = response.get(); |
| 82 | + // -> Buffer(...) |
| 83 | + }); |
| 84 | +``` |
| 85 | + |
| 86 | +Note: while it is possible to use `response.result` for text or JSON responses, in the case of a binary resonse, |
| 87 | +the `result` field will be base64-encoded. The `get()` method is recommended |
| 88 | +because it will return the correct type in all cases. |
| 89 | + |
| 90 | +### Error handling |
| 91 | + |
| 92 | +If an error occurs when calling an algorithm, the response will contain an error field that you can check: |
| 93 | + |
| 94 | +```javascript |
| 95 | +client.algo('util/whoopsWrongAlgo').pipe('Hello, world!') |
| 96 | + .then(function(response) { |
| 97 | + if(response.error) { |
| 98 | + console.log("Error: " + response.error.message); |
| 99 | + } { |
| 100 | + console.log(response.get()); |
| 101 | + } |
| 102 | + }); |
| 103 | +``` |
| 104 | + |
| 105 | +### Request options |
| 106 | + |
| 107 | +The Algorithmia API exposes parameters to configure algorithm requests including support |
| 108 | +for changing the timeout of indicating that the API should include stdout in the response. |
| 109 | +Currently, the node.js client exposes these as query paremeters to the algorithm URI: |
| 110 | + |
| 111 | +```javascript |
| 112 | +client.algo("algo://demo/Hello/0.1.1?timeout=10&stdout=true") |
| 113 | + .pipe("HAL 9000") |
| 114 | +``` |
| 115 | + |
| 116 | +Note: `stdout=true` is only supported if you have access to the algorithm source. |
| 117 | + |
| 118 | +## Working with data |
| 119 | + |
| 120 | +The Algorithmia client also provides a way to manage both Algorithmia hosted data and data from Dropbox or S3 accounts that you've connected to you Algorithmia account. |
| 121 | + |
| 122 | +### Create directories |
| 123 | + |
| 124 | +Create directories by instantiating a `Dir` object and calling `create()`: |
| 125 | + |
| 126 | +```javascript |
| 127 | +var robots = client.dir("data://.my/robots"); |
| 128 | +robots.create(function(response) { |
| 129 | + if(response.error) { |
| 130 | + return console.log("Failed to create dir: " + response.error.message); |
| 131 | + } |
| 132 | + console.log("Created directory: " + robots.data_path); |
| 133 | +}); |
| 134 | +``` |
| 135 | + |
| 136 | +### Upload files to a directory |
| 137 | + |
| 138 | +Upload files by calling the `putFile` method a `Dir` object or `put` on a `File` object: |
| 139 | + |
| 140 | +```javascript |
| 141 | +var robots = client.dir("data://.my/robots"); |
| 142 | +robots.putFile("/path/to/Optimus_Prime.png", function(response) { |
| 143 | + if(response.error) { |
| 144 | + return console.log("Failed to upload file: " + response.error.message); |
| 145 | + } |
| 146 | + console.log("File uploaded."); |
| 147 | +); |
| 148 | +``` |
| 149 | +
|
| 150 | +You can also write to a `File` using the `put` method with either a `string` or `Buffer` as input: |
| 151 | +
|
| 152 | +```javascript |
| 153 | +var prime = client.file("data://.my/robots/Optimus_Prime.txt"); |
| 154 | +prime.put("Leader of the Autobots", function(response) { |
| 155 | + if(response.error) { |
| 156 | + return console.log("Failed to upload file: " + response.error.message); |
| 157 | + } |
| 158 | + console.log("File uploaded."); |
| 159 | +); |
| 160 | +``` |
| 161 | +
|
| 162 | +### Download content from files |
| 163 | +
|
| 164 | +Download files by calling `get` on a `File` object: |
| 165 | +
|
| 166 | +```javascript |
| 167 | +var robots = client.dir("data://.my/robots"); |
| 168 | + |
| 169 | +// Get a text file's contents as a string |
| 170 | +robots.file("T-800.txt").get(function(err, data) { |
| 171 | + console.log(data); |
| 172 | +}); |
| 173 | + |
| 174 | +/// Get a binary file's contents as a Buffer |
| 175 | +robots.file("T-800.jpg").get(function(err, data) { |
| 176 | + console.log("Received " + data.length + " bytes."); |
| 177 | + fs.writeFileSync("/tmp/T-800.jpg", data); |
| 178 | +}); |
| 179 | +``` |
| 180 | +
|
| 181 | +### Delete files and directories |
| 182 | +
|
| 183 | +Delete files by calling `delete` on their respective `File` or `Dir` object. |
| 184 | +When deleting directories, you may optionally specify a `force` argument |
| 185 | +that indicates whether or not a directory should be deleted if it contains files or other directories (default = `false`). |
| 186 | +
|
| 187 | +```javascript |
| 188 | +var c3po = client.file("data://.my/robots/C-3PO.txt"); |
| 189 | +c3po.delete(function(response) { |
| 190 | + if(response.error) { |
| 191 | + return console.log("Failed to delete file: " + response.error.message); |
| 192 | + } |
| 193 | + console.log("Deleted file: " + c3po.data_path); |
| 194 | +}); |
| 195 | + |
| 196 | +// Force delete a directory |
| 197 | +client.dir("data://.my/robots") |
| 198 | + .delete(true, function(response) { |
| 199 | + /* ommitting callback implementation */ |
| 200 | + }); |
| 201 | +``` |
| 202 | +
|
| 203 | +### List directory contents |
| 204 | +
|
| 205 | +Iterate over the contents of a directory using the iterated returned by calling `forEachDir` or `forEachFile` on a `Dir` object: |
| 206 | +
|
| 207 | +```javascript |
| 208 | +// List top level directories |
| 209 | +client.dir("data://.my").forEachDir(function(err, dir) { |
| 210 | + if(err) { |
| 211 | + return console.log("Error: " + JSON.stringify(err)); |
| 212 | + } |
| 213 | + console.log(dir.data_path); |
| 214 | +}).then(function() { |
| 215 | + console.log("Finished listing directory"); |
| 216 | +}); |
| 217 | + |
| 218 | + |
| 219 | +// List files in the Public folder of your connected Dropbox account |
| 220 | +client.dir("dropbox://Public").forEachFile(function(err, file) { |
| 221 | + if(err) { |
| 222 | + return console.log("Error: " + JSON.stringify(err)); |
| 223 | + } |
| 224 | + console.log(file.data_path); |
| 225 | +}).then(function() { |
| 226 | + console.log("Finished listing directory"); |
| 227 | +}); |
| 228 | +``` |
| 229 | +
|
| 230 | +## Building the client |
| 231 | +
|
| 232 | +This project uses gulp to compile coffeescript. |
| 233 | +
|
| 234 | +```bash |
| 235 | +npm install |
| 236 | +npm install -g gulp-cli |
| 237 | + |
| 238 | +gulp |
| 239 | +``` |
| 240 | +
|
| 241 | +Note: Don't edit the .js in the `lib` directory; they will get overwritten on subsequent compiles. |
| 242 | +Instead, modify `.coffee` files in the `src` dir, and run `gulp`. |
| 243 | +
|
| 244 | +Testing (kinda) is currently achieved by running this bash loop and checking for error messages. |
| 245 | +
|
| 246 | +``` |
| 247 | +for f in examples/*.js; do node $f; done |
| 248 | +``` |
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