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tweak render stream implementation

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This commit is contained in:
Evan You 2016-05-08 18:11:19 -04:00
parent 8172e7e257
commit 097bb2e4e8
1 changed files with 36 additions and 32 deletions
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68
src/server/render-stream.js
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@ -1,6 +1,6 @@
import stream from 'stream'
const MAX_STACK_DEPTH = 500
const MAX_STACK_DEPTH = 1000
/**
* Original RenderStream implmentation by Sasha Aickin (@aickin)
@ -12,10 +12,42 @@ export default class RenderStream extends stream.Readable {
super()
this.buffer = ''
this.render = render
this.expectedSize = 0
this.write = (text, next) => {
const n = this.expectedSize
this.buffer += text
if (this.buffer.length >= n) {
this.next = next
this.pushBySize(n)
} else {
// continue rendering until we have enough text to call this.push().
// sometimes do this as process.nextTick to get out of stack overflows.
if (this.stackDepth >= MAX_STACK_DEPTH) {
process.nextTick(next)
} else {
this.stackDepth++
next()
this.stackDepth--
}
}
}
this.end = () => {
// the rendering is finished; we should push out the last of the buffer.
this.done = true
this.push(this.buffer)
}
}
pushBySize (n) {
const bufferToPush = this.buffer.substring(0, n)
this.buffer = this.buffer.substring(n)
this.push(bufferToPush)
}
_read (n) {
let bufferToPush
this.expectedSize = n
// it's possible that the last chunk added bumped the buffer up to > 2 * n,
// which means we will need to go through multiple read calls to drain it
// down to < n.
@ -24,41 +56,13 @@ export default class RenderStream extends stream.Readable {
return
}
if (this.buffer.length >= n) {
bufferToPush = this.buffer.substring(0, n)
this.buffer = this.buffer.substring(n)
this.push(bufferToPush)
this.pushBySize(n)
return
}
if (!this.next) {
this.stackDepth = 0
// start the rendering chain.
this.render(
// write
(text, next) => {
this.buffer += text
if (this.buffer.length >= n) {
this.next = next
bufferToPush = this.buffer.substring(0, n)
this.buffer = this.buffer.substring(n)
this.push(bufferToPush)
} else {
// continue rendering until we have enough text to call this.push().
// sometimes do this as process.nextTick to get out of stack overflows.
if (this.stackDepth >= MAX_STACK_DEPTH) {
process.nextTick(next)
} else {
this.stackDepth++
next()
this.stackDepth--
}
}
},
// done
() => {
// the rendering is finished; we should push out the last of the buffer.
this.done = true
this.push(this.buffer)
})
this.render(this.write, this.end)
} else {
// continue with the rendering.
this.next()