adding web sockets (part 1) #15
4 changed files with 298 additions and 57 deletions
173
helpers/lbryApi-old.js
Normal file
173
helpers/lbryApi-old.js
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@ -0,0 +1,173 @@
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// load dependencies
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var path = require('path');
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var axios = require('axios');
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// helper function to filter an array of claims for only free, public claims
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function filterForFreePublicClaims(claimsListArray){
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//console.log(">> filterForFreePublicClaims, claimsListArray:", claimsListArray);
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if (!claimsListArray) {
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return null;
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};
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var freePublicClaims = claimsListArray.filter(function(claim){
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return (((claim.value.stream.metadata.license.indexOf('Public Domain') != -1) || (claim.value.stream.metadata.license.indexOf('Creative Commons') != -1)) &&
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(!claim.value.stream.metadata.fee || claim.value.stream.metadata.fee === 0));
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});
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return freePublicClaims;
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}
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// helper function to decide if a claim is free and public
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function isFreePublicClaim(claim){
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console.log(">> isFreePublicClaim, claim:", claim);
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if ((claim.value.stream.metadata.license === 'Public Domain' || claim.value.stream.metadata.license === 'Creative Commons') &&
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(!claim.value.stream.metadata.fee || claim.value.stream.metadata.fee.amount === 0)) {
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return true;
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} else {
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return false;
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}
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}
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// helper function to order a set of claims
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function orderTopClaims(claimsListArray){
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console.log(">> orderTopClaims, claimsListArray:");
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claimsListArray.sort(function(claimA, claimB){
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if (claimA.amount === claimB.amount){
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return (claimA.height > claimB.height);
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} else {
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return (claimA.amount < claimB.amount);
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}
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})
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return claimsListArray;
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}
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module.exports = {
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publishClaim: function(publishObject){
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axios.post('http://localhost:5279/lbryapi', publishObject)
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.then(function (response) {
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// receive resonse from LBRY
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// if successfull, (1) delete file (2) send response to the client
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console.log(">> 'publish' success...");
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console.log(">> 'publish' response.data:", response.data);
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console.log(" [x] Done");
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// return the claim we got
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//res.status(200).send(JSON.stringify({msg: "you succsessfully published!", txData: response.data}));
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}).catch(function(error){
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// receive response from LBRY
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// if not successfull, (1) delete file and (2) send response to the client
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console.log(">> 'publish' error.response.data:", error.response.data);
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console.log(" [x] Done");
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//res.status(500).send(JSON.stringify({msg: "your file was not published", err: error.response.data.error.message}));
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})
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},
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serveClaimBasedOnNameOnly: function(claimName, res){
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// make a call to the daemon to get the claims list
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axios.post('http://localhost:5279/lbryapi', {
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method: "claim_list",
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params: {
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name: claimName
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}
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}
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).then(function (response) {
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console.log(">> Claim_list success");
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console.log(">> Number of claims:", response.data.result.claims.length)
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// return early if no claims were found
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if (response.data.result.claims.length === 0){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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// filter the claims to return free, public claims
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var freePublicClaims = filterForFreePublicClaims(response.data.result.claims);
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// return early if no free, public claims were found
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if (!freePublicClaims || (freePublicClaims.length === 0)){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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// order the claims
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var orderedPublcClaims = orderTopClaims(freePublicClaims);
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// create the uri for the first (selected) claim
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console.log(">> ordered free public claims", orderedPublcClaims);
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var freePublicClaimUri = "lbry://" + orderedPublcClaims[0].name + "#" + orderedPublcClaims[0].claim_id;
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console.log(">> your free public claim uri:", freePublicClaimUri);
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// fetch the image to display
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axios.post('http://localhost:5279/lbryapi', {
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method: "get",
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params: {
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uri: freePublicClaimUri
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}
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}
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).then(function (getResponse) {
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console.log(">> 'get claim' success...");
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console.log(">> response data:", getResponse.data);
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console.log(">> dl path =", getResponse.data.result.download_path)
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// return the claim we got
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res.status(200).sendFile(getResponse.data.result.download_path);
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}).catch(function(getError){
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console.log(">> /c/ 'get' error:", getError.response.data);
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res.status(500).send(JSON.stringify({msg: "An error occurred while fetching the free, public claim by URI.", err: getError.response.data.error.message}));
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})
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}).catch(function(error){
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console.log(">> /c/ error:", error.response.data);
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res.status(500).send(JSON.stringify({msg: "An error occurred while getting the claim list.", err: error.response.data.error.message}));
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})
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},
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serveClaimBasedOnUri: function(uri, res){
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/*
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to do: need to pass the URI through a test (use 'resolve') to see if it is free and public. Right now it is jumping straight to 'get'ing and serving the asset.
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*/
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console.log(">> your uri:", uri);
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// fetch the image to display
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axios.post('http://localhost:5279/lbryapi', { // to do: abstract this code to a function that can be shared
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method: "get",
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params: {
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uri: uri
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}
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}
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).then(function (getResponse) {
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console.log(">> 'get claim' success...");
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console.log(">> response data:", getResponse.data);
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console.log(">> dl path =", getResponse.data.result.download_path)
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/*
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to do: make sure the file has completed downloading before serving back the file
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*/
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// return the claim we got
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res.status(200).sendFile(getResponse.data.result.download_path);
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/* delete the file after a certain amount of time? */
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}).catch(function(error){
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console.log(">> /c/ 'get' error:", error.response.data);
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res.status(500).send(JSON.stringify({msg: "an error occurred", err: error.response.data.error.message}));
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})
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},
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serveAllClaims: function(claimName, res){
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// make a call to the daemon to get the claims list
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axios.post('http://localhost:5279/lbryapi', {
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method: "claim_list",
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params: {
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name: claimName
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}
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}
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).then(function (response) {
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console.log(">> Claim_list success");
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console.log(">> Number of claims:", response.data.result.claims.length)
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// return early if no claims were found
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if (response.data.result.claims.length === 0){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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// filter the claims to return free, public claims
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var freePublicClaims = filterForFreePublicClaims(response.data.result.claims);
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// return early if no free, public claims were found
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if (!freePublicClaims || (freePublicClaims.length === 0)){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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console.log(">> Number of free public claims:", freePublicClaims.length);
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// order the claims
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var orderedPublicClaims = orderTopClaims(freePublicClaims);
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// serve the response
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res.status(200).send(orderedPublicClaims); //to do: rather than returning json, serve a page of all these claims
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}).catch(function(error){
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console.log(">> /c/ error:", error.response.data);
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// serve the response
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res.status(500).send(JSON.stringify({msg: "An error occurred while finding the claim list.", err: error.response.data.error.message}));
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})
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}
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}
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@ -56,56 +56,83 @@ module.exports = {
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//res.status(500).send(JSON.stringify({msg: "your file was not published", err: error.response.data.error.message}));
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})
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},
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serveClaimBasedOnNameOnly: function(claimName, res){
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// make a call to the daemon to get the claims list
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axios.post('http://localhost:5279/lbryapi', {
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method: "claim_list",
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params: {
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name: claimName
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}
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}
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).then(function (response) {
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console.log(">> Claim_list success");
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console.log(">> Number of claims:", response.data.result.claims.length)
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// return early if no claims were found
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if (response.data.result.claims.length === 0){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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// filter the claims to return free, public claims
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var freePublicClaims = filterForFreePublicClaims(response.data.result.claims);
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// return early if no free, public claims were found
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if (!freePublicClaims || (freePublicClaims.length === 0)){
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res.status(200).sendFile(path.join(__dirname, '../public', 'noClaims.html'));
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return;
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}
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// order the claims
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var orderedPublcClaims = orderTopClaims(freePublicClaims);
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// create the uri for the first (selected) claim
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console.log(">> ordered free public claims", orderedPublcClaims);
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var freePublicClaimUri = "lbry://" + orderedPublcClaims[0].name + "#" + orderedPublcClaims[0].claim_id;
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console.log(">> your free public claim uri:", freePublicClaimUri);
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// fetch the image to display
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getClaimBasedOnNameOnly: function(claimName){
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// 1. create a promise
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var deferred = new Promise(function (resolve, reject){
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// 2. code to resolve or reject the promise
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// make a call to the daemon to get the claims list
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axios.post('http://localhost:5279/lbryapi', {
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method: "get",
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params: {
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uri: freePublicClaimUri
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}
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}
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).then(function (getResponse) {
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console.log(">> 'get claim' success...");
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console.log(">> response data:", getResponse.data);
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console.log(">> dl path =", getResponse.data.result.download_path)
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// return the claim we got
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res.status(200).sendFile(getResponse.data.result.download_path);
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}).catch(function(getError){
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console.log(">> /c/ 'get' error:", getError.response.data);
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res.status(500).send(JSON.stringify({msg: "An error occurred while fetching the free, public claim by URI.", err: getError.response.data.error.message}));
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method: "claim_list",
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params: { name: claimName }
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})
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}).catch(function(error){
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console.log(">> /c/ error:", error.response.data);
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res.status(500).send(JSON.stringify({msg: "An error occurred while getting the claim list.", err: error.response.data.error.message}));
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})
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.then(function (response) {
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console.log(">> Claim_list success");
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console.log(">> Number of claims:", response.data.result.claims.length)
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// return early if no claims were found
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if (response.data.result.claims.length === 0){
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reject({
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msg: "no claims",
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err: "no claims"
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});
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return;
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}
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// filter the claims to return free, public claims
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var freePublicClaims = filterForFreePublicClaims(response.data.result.claims);
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// return early if no free, public claims were found
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if (!freePublicClaims || (freePublicClaims.length === 0)){
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reject({
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msg: "no free, public claims",
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err: "no free, public claims"
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});
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return;
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}
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// order the claims
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var orderedPublcClaims = orderTopClaims(freePublicClaims);
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// create the uri for the first (selected) claim
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console.log(">> ordered free public claims", orderedPublcClaims);
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var freePublicClaimUri = "lbry://" + orderedPublcClaims[0].name + "#" + orderedPublcClaims[0].claim_id;
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console.log(">> your free public claim uri:", freePublicClaimUri);
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// fetch the image to display
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axios.post('http://localhost:5279/lbryapi', {
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method: "get",
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params: { uri: freePublicClaimUri }
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}
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).then(function (getResponse) {
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console.log(">> 'get claim' success...");
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console.log(">> response data:", getResponse.data);
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console.log(">> dl path =", getResponse.data.result.download_path)
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// resolve the promise with the download path for the claim we got
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resolve(getResponse.data.result.download_path);
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}).catch(function(getError){
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console.log(">> 'get' error:", getError.response.data);
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// reject the promise with an error message
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reject({
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msg: "An error occurred while fetching the free, public claim by URI.",
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err: getError.response.data.error.message
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});
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});
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})
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.catch(function(error){
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console.log(">> error:", error.response.data);
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// check to see what kind of error came back from lbry
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// reject the promise with an approriate message
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if (error.response.data){
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reject({
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msg: "An error occurred while getting the claim list.",
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err: error.response.data.error.message
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});
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} else {
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reject({
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msg: "An error occurred while getting the claim list.",
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err: error.response
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});
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}
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});
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});
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// 3. return the promise
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return deferred;
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This should probably be defined as a constant. This should probably be defined as a constant.
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},
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serveClaimBasedOnUri: function(uri, res){
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/*
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@ -11,6 +11,7 @@
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<p>spee.ch is a single-serving site that reads and publishes images to and from the <a href="https://lbry.io">LBRY</a> blockchain.</p>
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<h3>Status:</h3>
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<p id="status">your image is being retrieved</p>
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<div id="image"></div>
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<script src="/socket.io/socket.io.js"></script>
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<script>
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var socket = io();
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@ -18,10 +19,18 @@
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var url = document.URL.substring(document.URL.indexOf('3000/') + 5); // get from the window?
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// request the image through the socket
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socket.emit("image-request", url);
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socket.on("image-update", function(data){
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console.log("data:", data);
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document.getElementById("status").innerHTML = data;
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})
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// receive the image through the socket
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socket.on("image-send", function(data){
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console.log("data", data);
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if (data.image) {
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var base64Image = 'data:image/jpeg;base64,' + data.buffer;
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document.getElementById("image").innerHTML = '<img src="' + base64Image + '"/>';
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}
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})
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</script>
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</body>
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@ -1,20 +1,52 @@
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// routes to export
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module.exports = function(app) {
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var http = require("http").Server(app);
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var io = require("socket.io")(http);
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var http = require('http').Server(app);
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var io = require('socket.io')(http);
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var fs = require('fs');
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var path = require('path');
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var lbryApi = require('../helpers/lbryApi.js');
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function sendTheImage(socket, filePath){
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fs.readFile(filePath, function(err, buff){
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if (err) {
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console.log("fs err", err);
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return;
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};
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//console.log("buff", buff);
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socket.emit('image-send', { image: true, buffer: buff.toString('base64') });
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console.log('image file has been sent via sockets');
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});
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}
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io.on('connection', function(socket){
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console.log('a user connected');
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// trying to serve an image file from the server
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socket.on('image-request', function(data){
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// serve an image file from the server
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socket.on('image-request', function(name){
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// 1. retrieve the image from lbry via daemon
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console.log("received image request for:", data)
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console.log("received image request for:", name)
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var promise = lbryApi.getClaimBasedOnNameOnly(name);
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promise.then(function(data){
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console.log("socket-routes / image-request - success:", data)
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// 3. serve the image back once it is retrieved
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sendTheImage(socket, data);
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})
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.catch(function(error){
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console.log("socket-routes / image-request - error:", error)
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// handle the errors
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if (error.msg === "no claims"){
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socket.emit("image-update", "no claims were found for " + name);
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} else if (error.msg === "no free, public claims"){
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socket.emit("image-update", "no free, public claims were found for " + name);
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} else {
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socket.emit("image-update", "an unknown error occured with fetching claim");
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};
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return;
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});
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// 2. emit updates as the image is being retrieved
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// 3. serve the image back once it is retrieved
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socket.emit("image-send", "test string for: " + data);
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socket.emit("image-update", "we are getting your image for " + name);
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})
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// handle disconnect
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Loading…
Reference in a new issue
If you find yourself accessing the same field repeatedly, like getUriResponse.data, it can be good to just dereference it.
Additionally, assuming you're writing ES6 (which is probably a good idea), you can just write:
.then(({data}) => { if (data.result.error === "Timeout") //etc. })